For work-from-home, I can't emphasize enough how much of a game changer it is to have a physically separate building for your work, especially if you have a family with kids and noise and pets and things. Working from a spare bedroom, even one without a bed / outfitted as an office, is just not my thing. Even if your family "knows the rules" and let you work in peace. It subjectively still "feels like you're home". With a separate building, I can do a short walking commute and take those 10 seconds to "get into work mindset." And, once I'm out there, it can be a hermetically sealed, zero-distraction zone.
If you are lucky and fortunate enough to live in an actual house with land, and work (or are thinking about working) remotely, seriously consider investing in an actual separate building for your office.
Yeah, second that. I made my office separated from the main house and it's incredible.
We bought an old house and did a full remodel and planned for an office and a work kitchen (my wife is a chef) separated from the main house (and each other).
I jumped to the end and saw $2.3k for the mini split and couldn't believe it. I've installed mini splits on two homes and the quotes were always in the $15-25k range for 3-5 head units, so $2.3k for a head + outdoor condenser unit sounded implausible, but then I saw he found a surprisingly good deal:
> I got a ton of quotes for installing a mini split. They ranged from $4-$7k, which was higher than I expected after researching the cost of a quality small unit and knowing this would be a tiny job for an HVAC contractor, especially because I had my electrician prewire the electrical. I was considering installing a DIY system (Mr. Cool DIY system with pre-charged AC lines), But found an HVAC contractor who would install a system for a much lower price than the other quotes I received (and he had great reviews on Thumbtack). In the end, I got a Daikin Mini-split, a common system with many replacement parts. The installation took about 5 hours, and my tech did a great job. I am glad I researched and got a lot of quotes for this one.
I bought my first minisplit ~4 years ago since none of the contractors were available in the hot summer.
I bought the tools as well (vacuum pump, manifold, pipe cutters, etc.).
It cost me ~650$ total.
The next time I bought a minisplit (3.5kW one), I already had the tools and it cost me only 450$. A proper one meant for use during harsh winter would probably costs a bit more though, at around 1000$.
So I have set up a few of them for my family and friends so far. The units come pre-charged with gas for ~5M of ducts, there is nothing hard to set them up.
I also set up ESP32 controllers so I could attach them to Home Assistant, bypassing any Chinese cloud apps, etc.
one thing about discount DIY mini splits: they're sometimes/often the same model, with a hodge podge of similar but not identical components. it can be very difficult to get a repair person to work on these - they stand a lot to lose if they try to operate on it and make it worse. they really prefer consistency, and - they also seem to harbor a bit of a distaste for diy systems. Actually, I was educated by one serviceperson's opinion and by the end of their complaints, the experience cost more than the cash, injury wise. But I think relaying this, has some value, because I suspect it's common.
Honestly, I would recommend just doing it yourself. Especially if you have a contractor pull in the electrical connection for it. I installed a pre-charged unit in a much more complicated attic setup (condenser mounted to outside wall on second floor, 20' of refrigerant lines run with lots of angles) and the whole thing took 6-8 hours with no experience. Mounting it to a shed where you're basically just cutting a hole in a wall and the indoor unit and outdoor unit are in more or less the same location should be extremely straight forward. The unit cost me less than $1k five years ago and has been running perfectly ever since.
Thanks for taking the time to make this detailed write-up! You got a beautiful result, and I appreciate the spirit of sharing what you learned and helping people who are considering similar projects.
I'm glad you measured CO2. I've recently noticed I tend to get headaches when working or sleeping in small poorly-ventilated spaces, and I'm surprised how often I encounter new structures without ventilation. I guess tightly-sealed buildings are still a relatively new idea.
In the PNW you could probably be comfortable >90% of days with a cracked window, fan, adjustable shades, and a little electric radiator, but if I was doing this project I'd probably opt for the modern heat pump / ERV combo as well.
There isn't really any clinical evidence for CO2 levels impacting stuff beyond so called "sleep efficiency," where the effect is small (above 1000 ppm is 5% reduction in sleep efficiency) and it has the counterintuitive effect that less efficient sleep is sleeping longer, which is usually what people want. That said, placebo effects are still real.
Boy things are different in Portland where you pay people to insult sheds…
But 8x10 for $20,000 just goes to show how expensive USA is for construction. There’s a point where I would review coworking space cost (not as convenient, I know) to just living and owning property abroad.
In this day and age, where material stuff is so cheap, isn’t 20K for a tiny shed crazy? Clearly it is because it involves so much work, and work is so expensive, but I can’t help but think there should be a technical solution to this. Or buildings are just not automatable? I’m amazed.
You could do it for less than half that cost if you do your own labour. I actually came into the article thinking that’s what they did but was disappointed.
Im jealous of the Tuff Shed or prebuilt being an option. Where I live we have incredibly high snow loads, so any structure ends up needing to be custom built to meet our requirements (even out buildings). I've found plenty of pre-fab units that claim to handle "high snow loads" that will not meet code where I am.
I'm still planning on building out an office/studio, but it will be a much larger investment despite being able to DIY much of it.
well it just has to stop significant buildup over multiple days right? IDK, seems pretty effective here in tahoe where ive seen it applied on parts of peoples houses
Do people in Tahoe heat-tape their whole roof or just the edge where ice dams would otherwise form? I've only ever seen the latter, and even doing that will be noticeable on your power bill.
Cascade mountains. I've seen over 5 feet of snow in under 48 hours, then freezing rain. Its heavy! Lots of these "it'll be fine" type structures collapsed.
Building code for snow load is a factor of location and elevation here. We are around 130 lb/sq ft.
Roof pitch can help with shedding, but then you've got other problems (roof avalanches can and do kill, not to mention snow up against materials that don't want to be wet all winter).
This is a problem with the people and ideology that are concentrated in your jurisdiction and the resulting rules that come of that. Even the snootiest "Barack Obama is my neighbor" zip codes have permitting and code exemptions for various sorts of small sheds.
Structurally a wet fart will hold up plenty of snow when we're talking spans on the order of 10ft. A garden shed that can literally roll away in a tornado is only a few hundred dollars of material different from one that can't.
Of course Tuff Shed (or anyone else) isn't gonna make a special product line for one town in CO or wherever that wants to de-facto outlaw the construction of shed by people less than a certain wealth level. Those people can have their stuff built from scratch at great cost. Of the dozen lost sales they were likely some of the most problematic anyway.
Of course they wont! Plenty of people around here still use structures not built for the load or build under the square footage that requires a permit. Those can and do fail, and I'd prefer not to be in one when they do :).
My feedback is merely: boy it'd be nice to have the option to just order a pre-built.
Nice, I also have an office in my backyard. Although its a ~100 year old brick structure that was originally staff quarters. Had to put a new roof on it, run power, fibre and install AC. Now its my office / data centre (yes I put a rack in a room I sit in...)
Looks awesome, but I would have run single-mode fiber between the house and the office. Eliminates any issues with lightning strikes taking out equipment or other electrical gremlins, not to mention providing opportunity for expanding bandwidth in the future by just swapping out the SFP modules on each end. Pre-terminated fiber from fs.com is inexpensive and easy to work with - just measure and install.
Did similar, but went 12x16, trenched power and cat6, did rockwool insulation, did pine tongue and groove paneling and an Alaskan white cedar porch.
When we sold the house, I'm pretty sure the shed is what sealed the deal, people had all sorts of things they wanted it to be, even as a spare bedroom
i did a 24x36, with a loft. 2015, 32,000 bucks from lavalley's in newport nh, installed 80 miles away in another random town. poured slab. 6 windows, 2 garage doors. i realized, all i did was build a garage, not a work from home office.
but over the next few years i learned so many hobby art projects: insulation, electrical, sheetrock. a few inspections, a few consults. a few surprises that people in this state can just go buy the stuff at a box store!
and then eventually, my 12x6 foot office appeared, the same width as a 1960s metal tanker desk. finally!
and ... i instantly hated working out there. i didnt make it 6 weeks. it's just an office for storing crap, now: i work out of the house, where the kitchen, dogs, bathroom, are. but the journey was worth it, even if the destination was not.
> I wrote up my experience building a backyard office because I wish I had come across more articles like this when planning my build. I hope this post helps you on your journey.
I don't recall how technical it is[^1] because I read it years ago, but Michael Pollan wrote an entire book about building himself a writing room:
I always think about it, but then I remember I couldn't sleep knowing my tech stuff is inside a shed in the backyard. Too easy to break in and steal it.
I don't know what kind of tech stuff you have, but since you can run ethernet (or better, fiber) to the shed, you could keep most of it locked in the house and just walk out with your laptop to your workspace each day.
Monitors are relatively cheap these days, you can get a name brand 32" 4K monitor for around $300 - if someone busts in and steals it, the door/window repair will probably cost more than the monitor.
I've wanted to build one of these for a while just to have that "going into the office" feel even with WFH; appreciate the detail and breakdown. Also, lovely styled personal site.
$20K still seems like a lot to get some mosquito bites walking through the yard to work. Lack of plumbing, coffee, etc (some of those are fixable of course) is a bit of a turnoff but perhaps the walk is part of the charm.
I find that with kids mostly in school and knowing the rules the exterior space isn’t a requirement, but I don’t have a ton of meetings these days so YMMV. Mostly this is cope because I don’t have 20K to drop on a cool office! :)
If you're relatively handy, a lot of what OP paid for can be DIY'ed. I would have never paid a contractor to do all of that. Probably just the electrical. Especially the Tuff Shed structure. Those things are dead simple, marketed at DIYers, and can be finished in a weekend. Insulation, drywall, trim, and flooring is also child's play. OP could have easily cut the project's cost in half if he wanted to.
Yeah I had the same thoughts about what they chose to DIY vs hire out. Insulation is so simple, and trim can be done at your leisure. But thats also not likely to save much overall since the contractors also know how simple those are.
The Coffee issue is easy to solve, just bring a pitcher of water with you in the morning to pour into the coffee maker - it's what I did when my home office was in a spare room above the garage. The walk from his back yard to the indoor bathroom is probably shorter than the walk he'd have in any office.
I ran PVC between my house and shop/office with 2 sets of single-mode fiber instead of ethernet. Electrical code will require proper grounding for copper for lightning strikes.
Do you have an idea of the R-value of the insulation you put in? I'm wondering what this will take to heat and cool during the peaks of summer and winter.
True, things in the west tend to cost more than elsewhere (I'm in Seattle WA.)
My mother-in-law lives in rural Missouri and had her 6x10 bathroom remodeled in 2025. Full gut replacement of everything. Total cost: $5600. I got a quote for something similar in a bit larger bathroom in our house in Seattle. Quoted price: $31,000.
Labor is a good chunk of cost, and the OP presented that he simply didn't have the time available to him to do that work himself. On the other hand, I built 20-ish feet of fencing for our backyard this summer, matching an existing design we had done several years ago. Quoted price from the same company that did it the first time: $9800. I did the work myself. My total cost: $1400.
That works out great, right? I also have a significant investment in all the right tools: compound mitre saw, construction-grade table saw, nail guns, impact/hammer/regular drills, angle grinders, power sanders, every drill bit in captivity -- I don't really lack for anything. These make a huge difference in the workmanship of the final outcome.
And that was just a fence. I've considered building an external office here at our house. When I start to take into account the scope of converting an outdoor shed to an acceptable backyard office, I hit the brakes. Electrical power under proper permits, adequate security, something that holds up under our weather, potential water/sewer access, and sufficient space to work (I can't live without a whiteboard)...there is more scope than meets the eye.
All things considered, I think the OP did a pretty good job here in terms of cost control and recognizing what he could do (windows) vs. needed someone else to do (proper electrical.)
A lot of that cost is labour. Look at all the spots it says "contracted" in the breakdown. If you can do a lot of the work yourself, then you can save a lot of $$$, but it's a tradeoff of course. (They also could have saved quite a bit by just having a window unit AC, but that's up to them.)
Seems about right given labor. If you do most things yourself other than electrical, can probably cut cost a fair bit. But tradespeople are expensive when you can even get them.
I considered doing this or buying a house that already had an ADU/casita when we were house shopping, but I have a very different situation with being mostly home alone during the day and a dedicated room in the house for an office. I still think this might be an ideal though, because having a physically separate space has both psychological and physical advantages. Particularly, I wish I could pre-wire a /lot/ of networking in the space and separately air condition it, because I prefer much colder temperatures and it'd be cheaper to keep a separate office at 68F and the house at 74F than try to keep the house at 68-70F.
Not a great idea for those in snowy areas of the USA. A short burst of snow storms and now to get to work you're dealing with typical access problems such as frozen doors, shoveling, ice, and cleaning up the melt or adding some small mudroom to get in and out during the day. Also, watching your kids play and build a snowman right in front of your window while you sit in a meeting would feel like torture.
I'm sure it would increase the cost of the project by many times and require more complex permits, but just think how cool it would be to access your office shed through an underground tunnel.
For work-from-home, I can't emphasize enough how much of a game changer it is to have a physically separate building for your work, especially if you have a family with kids and noise and pets and things. Working from a spare bedroom, even one without a bed / outfitted as an office, is just not my thing. Even if your family "knows the rules" and let you work in peace. It subjectively still "feels like you're home". With a separate building, I can do a short walking commute and take those 10 seconds to "get into work mindset." And, once I'm out there, it can be a hermetically sealed, zero-distraction zone.
If you are lucky and fortunate enough to live in an actual house with land, and work (or are thinking about working) remotely, seriously consider investing in an actual separate building for your office.
Yeah, second that. I made my office separated from the main house and it's incredible.
We bought an old house and did a full remodel and planned for an office and a work kitchen (my wife is a chef) separated from the main house (and each other).
It's been a game changer
I jumped to the end and saw $2.3k for the mini split and couldn't believe it. I've installed mini splits on two homes and the quotes were always in the $15-25k range for 3-5 head units, so $2.3k for a head + outdoor condenser unit sounded implausible, but then I saw he found a surprisingly good deal:
> I got a ton of quotes for installing a mini split. They ranged from $4-$7k, which was higher than I expected after researching the cost of a quality small unit and knowing this would be a tiny job for an HVAC contractor, especially because I had my electrician prewire the electrical. I was considering installing a DIY system (Mr. Cool DIY system with pre-charged AC lines), But found an HVAC contractor who would install a system for a much lower price than the other quotes I received (and he had great reviews on Thumbtack). In the end, I got a Daikin Mini-split, a common system with many replacement parts. The installation took about 5 hours, and my tech did a great job. I am glad I researched and got a lot of quotes for this one.
I bought my first minisplit ~4 years ago since none of the contractors were available in the hot summer. I bought the tools as well (vacuum pump, manifold, pipe cutters, etc.).
It cost me ~650$ total.
The next time I bought a minisplit (3.5kW one), I already had the tools and it cost me only 450$. A proper one meant for use during harsh winter would probably costs a bit more though, at around 1000$.
So I have set up a few of them for my family and friends so far. The units come pre-charged with gas for ~5M of ducts, there is nothing hard to set them up.
I also set up ESP32 controllers so I could attach them to Home Assistant, bypassing any Chinese cloud apps, etc.
one thing about discount DIY mini splits: they're sometimes/often the same model, with a hodge podge of similar but not identical components. it can be very difficult to get a repair person to work on these - they stand a lot to lose if they try to operate on it and make it worse. they really prefer consistency, and - they also seem to harbor a bit of a distaste for diy systems. Actually, I was educated by one serviceperson's opinion and by the end of their complaints, the experience cost more than the cash, injury wise. But I think relaying this, has some value, because I suspect it's common.
Honestly, I would recommend just doing it yourself. Especially if you have a contractor pull in the electrical connection for it. I installed a pre-charged unit in a much more complicated attic setup (condenser mounted to outside wall on second floor, 20' of refrigerant lines run with lots of angles) and the whole thing took 6-8 hours with no experience. Mounting it to a shed where you're basically just cutting a hole in a wall and the indoor unit and outdoor unit are in more or less the same location should be extremely straight forward. The unit cost me less than $1k five years ago and has been running perfectly ever since.
Thanks for taking the time to make this detailed write-up! You got a beautiful result, and I appreciate the spirit of sharing what you learned and helping people who are considering similar projects.
I'm glad you measured CO2. I've recently noticed I tend to get headaches when working or sleeping in small poorly-ventilated spaces, and I'm surprised how often I encounter new structures without ventilation. I guess tightly-sealed buildings are still a relatively new idea.
In the PNW you could probably be comfortable >90% of days with a cracked window, fan, adjustable shades, and a little electric radiator, but if I was doing this project I'd probably opt for the modern heat pump / ERV combo as well.
There isn't really any clinical evidence for CO2 levels impacting stuff beyond so called "sleep efficiency," where the effect is small (above 1000 ppm is 5% reduction in sleep efficiency) and it has the counterintuitive effect that less efficient sleep is sleeping longer, which is usually what people want. That said, placebo effects are still real.
Boy things are different in Portland where you pay people to insult sheds…
But 8x10 for $20,000 just goes to show how expensive USA is for construction. There’s a point where I would review coworking space cost (not as convenient, I know) to just living and owning property abroad.
In this day and age, where material stuff is so cheap, isn’t 20K for a tiny shed crazy? Clearly it is because it involves so much work, and work is so expensive, but I can’t help but think there should be a technical solution to this. Or buildings are just not automatable? I’m amazed.
You could do it for less than half that cost if you do your own labour. I actually came into the article thinking that’s what they did but was disappointed.
DIY https://buildfreely.com
For those wanting more inspiration for similar builds, this reddit community is pretty good: https://www.reddit.com/r/shedditors/
Author, if you're here, there's a typo. > I was planning on insulting the office myself
What did it do to you that you needed to insult it?
I’m glad I’m not the only one who found this amusing!
It was cold in the winter and hot in the summer. How dare it do that to me. Clearly the only option is insult.
Im jealous of the Tuff Shed or prebuilt being an option. Where I live we have incredibly high snow loads, so any structure ends up needing to be custom built to meet our requirements (even out buildings). I've found plenty of pre-fab units that claim to handle "high snow loads" that will not meet code where I am.
I'm still planning on building out an office/studio, but it will be a much larger investment despite being able to DIY much of it.
DIY via https://buildfreely.com
Cool app! I have plenty of building experience thankfully, including plenty of structures still standing under the weight of our snow load!
What if you just put heat tape on the roof? These sheds have small roofs, shouldn’t be prohibitive
Heat tape isn't very effective with storms dropping multiple feet of wet snow in under 24 hours (or in general).
well it just has to stop significant buildup over multiple days right? IDK, seems pretty effective here in tahoe where ive seen it applied on parts of peoples houses
Do people in Tahoe heat-tape their whole roof or just the edge where ice dams would otherwise form? I've only ever seen the latter, and even doing that will be noticeable on your power bill.
also idk, tons of people up here have regular sheds for various purposes and they seem to survive just fine
woof, where are you located, coastal/northern Canada?
Cascade mountains. I've seen over 5 feet of snow in under 48 hours, then freezing rain. Its heavy! Lots of these "it'll be fine" type structures collapsed.
Building code for snow load is a factor of location and elevation here. We are around 130 lb/sq ft.
Roof pitch can help with shedding, but then you've got other problems (roof avalanches can and do kill, not to mention snow up against materials that don't want to be wet all winter).
Sounds like Tahoe.
This is a problem with the people and ideology that are concentrated in your jurisdiction and the resulting rules that come of that. Even the snootiest "Barack Obama is my neighbor" zip codes have permitting and code exemptions for various sorts of small sheds.
Structurally a wet fart will hold up plenty of snow when we're talking spans on the order of 10ft. A garden shed that can literally roll away in a tornado is only a few hundred dollars of material different from one that can't.
Of course Tuff Shed (or anyone else) isn't gonna make a special product line for one town in CO or wherever that wants to de-facto outlaw the construction of shed by people less than a certain wealth level. Those people can have their stuff built from scratch at great cost. Of the dozen lost sales they were likely some of the most problematic anyway.
Of course they wont! Plenty of people around here still use structures not built for the load or build under the square footage that requires a permit. Those can and do fail, and I'd prefer not to be in one when they do :).
My feedback is merely: boy it'd be nice to have the option to just order a pre-built.
Nice, I also have an office in my backyard. Although its a ~100 year old brick structure that was originally staff quarters. Had to put a new roof on it, run power, fibre and install AC. Now its my office / data centre (yes I put a rack in a room I sit in...)
https://tuhat.net/@sbr/p/big-tech-sucks
The rack warms it in the winter so I don't need any extra cooling, and I run the AC in the summer.
Looks awesome, but I would have run single-mode fiber between the house and the office. Eliminates any issues with lightning strikes taking out equipment or other electrical gremlins, not to mention providing opportunity for expanding bandwidth in the future by just swapping out the SFP modules on each end. Pre-terminated fiber from fs.com is inexpensive and easy to work with - just measure and install.
Did similar, but went 12x16, trenched power and cat6, did rockwool insulation, did pine tongue and groove paneling and an Alaskan white cedar porch. When we sold the house, I'm pretty sure the shed is what sealed the deal, people had all sorts of things they wanted it to be, even as a spare bedroom
i did a 24x36, with a loft. 2015, 32,000 bucks from lavalley's in newport nh, installed 80 miles away in another random town. poured slab. 6 windows, 2 garage doors. i realized, all i did was build a garage, not a work from home office.
but over the next few years i learned so many hobby art projects: insulation, electrical, sheetrock. a few inspections, a few consults. a few surprises that people in this state can just go buy the stuff at a box store!
and then eventually, my 12x6 foot office appeared, the same width as a 1960s metal tanker desk. finally!
and ... i instantly hated working out there. i didnt make it 6 weeks. it's just an office for storing crap, now: i work out of the house, where the kitchen, dogs, bathroom, are. but the journey was worth it, even if the destination was not.
> I wrote up my experience building a backyard office because I wish I had come across more articles like this when planning my build. I hope this post helps you on your journey.
I don't recall how technical it is[^1] because I read it years ago, but Michael Pollan wrote an entire book about building himself a writing room:
https://michaelpollan.com/books/a-place-of-my-own/
[^1]: Being familiar with Pollan's writing, it's likely at least as much philosophical and meditative as technical and practical.
I always think about it, but then I remember I couldn't sleep knowing my tech stuff is inside a shed in the backyard. Too easy to break in and steal it.
I don't know what kind of tech stuff you have, but since you can run ethernet (or better, fiber) to the shed, you could keep most of it locked in the house and just walk out with your laptop to your workspace each day.
Monitors are relatively cheap these days, you can get a name brand 32" 4K monitor for around $300 - if someone busts in and steals it, the door/window repair will probably cost more than the monitor.
There's probably lots of ways to secure it if you think about it.
I've wanted to build one of these for a while just to have that "going into the office" feel even with WFH; appreciate the detail and breakdown. Also, lovely styled personal site.
Looks like a great setup!
$20K still seems like a lot to get some mosquito bites walking through the yard to work. Lack of plumbing, coffee, etc (some of those are fixable of course) is a bit of a turnoff but perhaps the walk is part of the charm.
I find that with kids mostly in school and knowing the rules the exterior space isn’t a requirement, but I don’t have a ton of meetings these days so YMMV. Mostly this is cope because I don’t have 20K to drop on a cool office! :)
Nice work and thanks for the post!
If you're relatively handy, a lot of what OP paid for can be DIY'ed. I would have never paid a contractor to do all of that. Probably just the electrical. Especially the Tuff Shed structure. Those things are dead simple, marketed at DIYers, and can be finished in a weekend. Insulation, drywall, trim, and flooring is also child's play. OP could have easily cut the project's cost in half if he wanted to.
Yeah I had the same thoughts about what they chose to DIY vs hire out. Insulation is so simple, and trim can be done at your leisure. But thats also not likely to save much overall since the contractors also know how simple those are.
> $20K still seems like a lot to get some mosquito bites walking through the yard to work.
In some parts of the world, people consider spending time outdoors to be a positive thing.
The Coffee issue is easy to solve, just bring a pitcher of water with you in the morning to pour into the coffee maker - it's what I did when my home office was in a spare room above the garage. The walk from his back yard to the indoor bathroom is probably shorter than the walk he'd have in any office.
Its gross but a pee bottle is what I'd do.
Really? Why not step outside and help water the plants? It is your backyard, after all.
that feels pretty excessive
I ran PVC between my house and shop/office with 2 sets of single-mode fiber instead of ethernet. Electrical code will require proper grounding for copper for lightning strikes.
Insulating -> insulting is a funny typo.
Do you have an idea of the R-value of the insulation you put in? I'm wondering what this will take to heat and cool during the peaks of summer and winter.
R-19. You can see label in the picture.
Maybe it's just me but it blows my mind that this tiny thing cost $20k. I wish building stuff in the West wasn't so expensive.
True, things in the west tend to cost more than elsewhere (I'm in Seattle WA.)
My mother-in-law lives in rural Missouri and had her 6x10 bathroom remodeled in 2025. Full gut replacement of everything. Total cost: $5600. I got a quote for something similar in a bit larger bathroom in our house in Seattle. Quoted price: $31,000.
Labor is a good chunk of cost, and the OP presented that he simply didn't have the time available to him to do that work himself. On the other hand, I built 20-ish feet of fencing for our backyard this summer, matching an existing design we had done several years ago. Quoted price from the same company that did it the first time: $9800. I did the work myself. My total cost: $1400.
That works out great, right? I also have a significant investment in all the right tools: compound mitre saw, construction-grade table saw, nail guns, impact/hammer/regular drills, angle grinders, power sanders, every drill bit in captivity -- I don't really lack for anything. These make a huge difference in the workmanship of the final outcome.
And that was just a fence. I've considered building an external office here at our house. When I start to take into account the scope of converting an outdoor shed to an acceptable backyard office, I hit the brakes. Electrical power under proper permits, adequate security, something that holds up under our weather, potential water/sewer access, and sufficient space to work (I can't live without a whiteboard)...there is more scope than meets the eye.
All things considered, I think the OP did a pretty good job here in terms of cost control and recognizing what he could do (windows) vs. needed someone else to do (proper electrical.)
A lot of that cost is labour. Look at all the spots it says "contracted" in the breakdown. If you can do a lot of the work yourself, then you can save a lot of $$$, but it's a tradeoff of course. (They also could have saved quite a bit by just having a window unit AC, but that's up to them.)
It's probably more expensive now. No date stamp on the article but was first submitted to HN in 2023.
Seems about right given labor. If you do most things yourself other than electrical, can probably cut cost a fair bit. But tradespeople are expensive when you can even get them.
The building is cheap, the labor is expensive. I built a much larger shed in volumetric space last year for 1/4th the cost.
I considered doing this or buying a house that already had an ADU/casita when we were house shopping, but I have a very different situation with being mostly home alone during the day and a dedicated room in the house for an office. I still think this might be an ideal though, because having a physically separate space has both psychological and physical advantages. Particularly, I wish I could pre-wire a /lot/ of networking in the space and separately air condition it, because I prefer much colder temperatures and it'd be cheaper to keep a separate office at 68F and the house at 74F than try to keep the house at 68-70F.
He spent way too much.
Not a great idea for those in snowy areas of the USA. A short burst of snow storms and now to get to work you're dealing with typical access problems such as frozen doors, shoveling, ice, and cleaning up the melt or adding some small mudroom to get in and out during the day. Also, watching your kids play and build a snowman right in front of your window while you sit in a meeting would feel like torture.
I'm sure it would increase the cost of the project by many times and require more complex permits, but just think how cool it would be to access your office shed through an underground tunnel.