Services ADUs
ADU builder in Mount Vernon, Anacortes, Burlington & Skagit County. Detached backyard cottages, attached ADUs & garage conversions — permitted, built to code, managed start to finish.
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No 7 Development builds accessory dwelling units and detached accessory dwelling units for homeowners across Mount Vernon, Burlington, Anacortes, Oak Harbor, Bellingham, and throughout Skagit, Whatcom, and Island County.
An ADU is one of the most valuable investments a Northwest Washington homeowner can make — adding usable square footage, housing for family members, or rental income potential without the cost and complexity of buying a new property. Done right, it looks intentional, functions well, and adds lasting value to your property.
What We Build
We build all three main types of ADUs depending on your property and goals. Detached ADUs are standalone backyard cottages built separately from your main home — the most flexible option and typically the most valuable. Attached ADUs connect directly to your existing home as a self-contained unit with its own entrance. Garage conversion ADUs transform an existing garage into finished living space — often the most cost-effective path when the structure is already in place.
Permitting in Skagit and Surrounding Counties
ADU permitting requirements vary significantly between jurisdictions in Northwest Washington. What's allowed in unincorporated Skagit County differs from city of Mount Vernon requirements, which differ again from Island County or Whatcom County rules. Setbacks, size limits, owner-occupancy requirements, and utility connection rules all vary. We know these jurisdictions and handle the permitting process so you're not navigating it alone.
What Does an ADU Cost?
ADU project costs vary widely depending on type, size, site conditions, and finish level. A garage conversion and a fully detached 800 square foot cottage are very different scopes. We'll give you an honest number after understanding your specific property and goals — not a ballpark that bears no resemblance to the final invoice.
We've built ADUs in Mount Vernon, Anacortes, Oak Harbor, Burlington, and across the islands and valleys of Northwest Washington. If you're considering an ADU on your property, contact us for a free consultation.
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I hired Matt to finish a basement for me. He did all of it from start to finish. The attention to detail was excellent. He has years of experience in the trade so he was able to provide insight to improve upon my vision of what I wanted. This not only allowed for the rooms to be more functional but added more resale value in the end. I highly recommend Matt and his team for any of your building projects! See more See less
Matt was fantastic to work with! Honest, efficient, and trustworthy. Definitely working with him again if needed. Thank you!! See more See less
These guys are Awesome to work with!!! Easy to communicate with and Extremely Trustworthy!! We look forward to working with them in the future projects! Thank you No 7 Development‼️💯👍🏼👍🏼 See more See less
Matt Kuehn and Kayla are wonderful, caring people to work with. They listened to what we needed and coordinated our projects quite well as the site contractors to get groundwork done, service in, a foundation ready for the modular and then to build a garage. We experienced one complication with the foundation but Matt quickly addressed that. We were at times frustrated with their stretched-out scheduling, but did realize we were not their only build. Clean-up post completion, again, was not as soon as expected, but did get done. There was a challenge with the work of one subcontractor that we had to resolve ourselves but the company was on the County list, so we don’t blame No7 for that choice. Near completion of the garage, we wanted some extra work done and Matt made sure to line up the tradesmen quickly to fit our request. No7 was recommended to us so we did not go out and get other bids. As novices we would not have known the best way to approach that or evaluate them, therefore cannot say how reasonable or not the costs were. No7 was flexible with some payments as we waited on transferring funds. They always answered our questions and we feel the work was done to a quality standard. Yes, we would recommend that if you are looking for a builder you include talking with No7. See more See less
So I had looked for reno help on a house project these awesome guys called me back I live in canada in alberta and and there in Washington state though they were unable to help me to phyically get the job done as we're close to 1000 kilometers apart they called me back to assist me and at least get me going in the right direction.... thats called awesome customer service talk to them even if you have a question there knowledgeable and very decent to talk Thanks for all you help guys I'll post photos on how it goes :) See more See less
I contacted Matt in March 2021 about seeing if he was interested in constructing a deck off a 2nd floor ADU. He came and evaluated the job a couple days later (on a Saturday) and said that not only he could do it, but that it could be done in about 2 days and he could start the very next Saturday. We also agreed that because this was a small project it could be done between his other major jobs and might take a week or two to complete. I was skeptical and expected the typical "something came up, have to postpone/cancel" call, but he showed up bright and early on the following Saturday to start work just as promised. We discussed some modifications which improved the aesthetics of the deck and he got down to business. Two weeks later on a Saturday he showed up again bright and early, completed the deck and it has exceeded my expectations. I watched the entire process and asked many a question, and he had a thoughtful and professional answer for every one. I have carpenters and architects in my family so I probably know just enough to know what is quality work and what is not. Matt really builds beautiful and durable stuff. The planning dept inspector asked a few clarification questions and was very pleased with the structural integrity and how it was built. I have another project in the pipeline and I hope that I can recruit Matt to do that one for me. See more See less
No. 7 Development is a first class company. Matt is a solid guy that sticks to his word. We had Matt and his crew do a build out in our office location and he got done earlier than planned and on budget. Two things that rarely happen these days. Their work is top of the line and I was really impressed with the final product. I would recommend No. 7 Development to anybody looking for a great builder. See more See less
I hired Matt and his team to help frame my new dream home. When my foundation crew skipped town and left me in a bind, Matt jumped in and saved the day. In an area where construction seems more like the wild west where there is no quality control or repercussions for people who have no business in construction, Matt is a rare find. He is trustworthy, honest, and hard-working, qualities that are definitely hard to come by in construction in Seattle these days. If you are in need of work to be done, I would not hesitate to call Matt and his crew. See more See less
We had a massive kitchen, laundry and room remodel. Matt and his crew were incredible. We have limited experience in contemporary products and design ideas. It was a real benefit to have not just a contractor but consultant to identify improvements, efficiencies, and economical yet quality alternatives. We appreciated the software they used to provide quotes, estimates and construction progress. The project took months and was in our main living area. Not ideal for the contractor or the customer. Despite the inconvenience, Matt, Dakota and Kayla were considerate and trustworthy individuals who took great pride in their work. Highly recommend. See more See less
Thank you to Matt and his team at Number 7 Development !!! The remodel of my childhood home exceeded my expectations and they went above and beyond to stay within our budget. I have had the unfortunate experience of overpriced poor craftsmanship and am very thankful to have found Matt and his team. See more See less
We enjoyed working with Matt. He was very attentive when listening to our ideas and when I asked about his thoughts/opinions, he was honest. We discussed that we wanted to stay within our budget, but of course issues would come up in an older home. He would give us multiple different options with explanations and let us decide. We were extremely satisfied with the outcome of the home!! Wish I had a picture of the finished kitchen!! Here are some pictures I do have. The home is from the mid-60’s as well. See more See less
These guys are great. They showed up at 9 every day and didn’t leave until dusk sometimes. Pricing is reasonable for the quality work they produce. Our house looks really good. All our neighbors have told us the same. They’re all friendly and really listen to the client. Couldn’t be any happier. See more See less
We worked with No 7 to expand our shop and we are so incredibly thrilled with how our space turned out. They were communicative and wonderful to work with! See more See less
Matt and Kayla were delightful to work with and were very responsive. Matt and his crew did high quality work on our Kitchen remodel. All of Matts crew were professional and courteous, and at the end of a work day, cleaned everything up very well. I can recommend them highly. See more See less
Matt and Kayla are a wonderful father/daughter team. They are always so responsive and do high quality work. Have worked with them twice now on two different projects and will absolutely retain them for any future projects! Highly recommend! See more See less
Matt and his crew did a great job! They are honest and communicative. Will definitely use them in the future See more See less
Matt and Kayla are a wonderful father/daughter team. They are always so responsive and do high quality work. Have worked with them twice now on two different projects and will absolutely retain them for any future projects! Highly recommend! See more See less
This is a great company!! Family owned and wonderful to work with. We hired them for a full kitchen remodel along with our laundry room. Their team was easy to work with and had great design ideas to help us maximize our space. They paid close attention to detail and went up and beyond to ensure things were done right, while still being mindful of cost and staying on budget. I would (and will) hire them again in the future! See more See less
Hired No. 7 to complete some repair work on the decks at my rental property. Matt was very easy to work with, did what he said he would do, communicated well and completed the work efficiently. I also thought his pricing was fair. I plan on hiring him again in the future and would recommend. See more See less
I have had the privilege of having remodeling work done by Number 7 Development. Matt and his crew are awesome. Not only did they do great work, on time and on budget, they handled most of the design work as well. Matt and his crew were professional from start to finish. I have had occasion to hire many contractors in my four decades of business, and Number 7 Development stands out at the top of the list of all General Contractors I have worked with. Pride, honesty, and integrity seem to be just marketing words by most, but Matt and his team are proof these values are still alive and well. Most Sincerely, Greg Pinneo Real Estate Entrepreneur See more See less
Matt and crew were amazing during our home remodeling...always attentive, sharing great ideas, with excellent planning and execution. They worked long hours to complete each phase/task and negotiated the complexity of permitting on the Island. As we plan each new phase of our remodeling adventure, Matt continues to be involved...even when we get into our DIY projects. His ideas and guidance are invaluable. We strongly recommend No 7 Development for any construction project! See more See less
I definitely recommend No. 7 Development. Matt and his crew were excellent to work with during the renovation process. Personable and extremely knowledgeable, Matt is an excellent craftsman. Everything was completed beyond my expectations! Thank you so much for a great job, outstanding quality, and professionalism. See more See less
I use No. 7 because they are great at communicating, getting contractors scheduled appropriately, easy to work with and the end product always is above and beyond! I’ll use them for all my projects! See more See less
Matt and the No 7 Development Team were absolutely amazing. Communication was open at all hours throughout the whole process, they were very punctual and professional and at the same time very friendly and understanding. Would definitely recommend them to anyone See more See less
Working with No.7 has been an absolute pleasure. All work was done on time and on budget. All of the workers were not only professional but went out of their way to be helpful and kind. When we had questions or needed suggestions someone always took the time to help us out. I gave used this company for 2 projects and hopefully a third in the future. I would highly recommend to anyone. See more See less
Matt’s quality of construction are matched by his professionalism and honesty. Anyone having a home built by him would be very fortunate. See more See less
Matt from No 7 Development is very professional and easy to work with. I highly recommend them! See more See less
I called No 7 to complete a project and was happy I did. They not only kept to schedule and budget but they also were able to tackle another project that I had planned on completing at another date. Highly recommend will call for all of my contracting needs. See more See less
Matt and Kayla were amazing crew was friendly and the work they did was spot on to the vision we communicated. See more See less
Matt and his crew put together our SIPs house and shop walls and framed the rest. Good communication and use of project management software to stay organized and updated. The whole crew was pleasant to work with. Thanks Matt! See more See less
After living on Samish Island for almost 3 years, I have struggled to find good help with home projects. On Saturday, I got a leak in my garage from a nearby bathroom, so as I was working to find someone to fix that problem, I also contacted some contractors to do a much planned remodel of that bathroom since we had the leak anyway. Matt came out ON A SUNDAY to check out the potential remodel project and came back the next day on MONDAY NIGHT to stop the leak, he did this BEFORE any of the plumbers I had called even responded to me!! He was professional, compassionate, sincere and outstanding in this work ethic and attention to detail. I have cancelled all my other meetings with contractors for the bathroom remodel and am working with Matt exclusively. Call Matt, he's terrific and he really cares. See more See less
Matt and his Crew at No. 7 Development were in a word "Awesome." They took two unsightly rooms and turned them into the most beautiful Spa-like bathroom with oversized tiled shower and towel dry-off area! Absolutely gorgeous, exactly what I dreamed of!! I would hire them again in a second! Oh, I already have. Can hardly wait for them to start our next project! JR Greene/Arlington See more See less
No 7 Development did a wonderful job installing our SIP roof panels. Our job site was narrow and cluttered, but Matt and his crew executed well without gripe or complaint. Great communication and friendly service. See more See less
Matt and his team did an excellent job remodeling our guest bathroom! From the onset they were quick to respond to my inquiry and were able to fit our project into their existing schedule. The work they performed was very high quality. We are very pleased with the whole experience and love the end result! See more See less
No 7 Development is fantastic to work with! Matt is approachable, responsive and made the overall experience of scheduling work to be done at my house enjoyable and stress free. I am fairly new to the area and I reached out to 8 contractors and builders for a small job - and Matt immediately got back to me. He communicated with me quickly and was clear to about availability and estimates. He worked within my schedule - and helped with demolition, prep and installation of a project for my kitchen. I have been highly satisfied with No 7 Development - and I will continue to use Matt and his company going forward. I would highly recommend anyone contact No 7 Development for professional and reasonable projects. See more See less
We usually respond via text within a few minutes.
We usually respond via text within a few minutes.
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