How much do addition contractors typically cost?
- Gaithersburg, Maryland Average$81,330
- Typical Range$43,250 - $127,416
- Low End - High End$15,000 - $216,000

Carpentry, Home Remodeling, Interior Trim , and 2 more
"Noel and his team did a speedy and fantastic job installing the fence. Would recommend, and I plan on calling him again when itโs time to re-do my deck."
Bradley R. in November 2021

home bar, bath, basement refinishing , and 2 more
"I needed 3 things done: 1) a hole in my living room ceiling fixed. 2) the railings, and the boards on my front porch and steps needed replacing, and 3) my downstairs toilet needed replacing. He/they fixed my ceiling and it looks like new. My porch looks like new, and when they replaced my toilet, they discovered some issues...there were rotten boards underneath. The fixed it with care... better than it was, reinforcing the boards underneath to better support the toilet. When I had other concerns, they took care of them. Their prices are reasonable, and they do GREAT WORK. I've found my maintenance company. Y'all should give them a try. You will be very satisfied with their work. Also, the men are very nice, and pleasant."
183387E59882268C37680CE94B62225F3F4F3773F7D5BB9E40145A7C3E3E362D B. in July 2026

Carpentry
"Wonderful experience with Calix Carpentry! Would definitely recommend. Very professional, job was done timely and on budget!"
F60BF236BE803C7288D764902B13BBD423FD1A5E8CEDA0248228C21577B529F6 8. in April 2026
Basement Remodeling, (Unfinished), Drywall, Additions, Interior Painting, Exterior Painting, Flooring, Shed building, Pressure Washing, Desk's, Commercial , and 7 more
"JAKE team, Renovated our bathroom with excellent workmanship and with attention to details. The job turnout very good and I would highly recommend JAKE to anyone who is looking to do an improvement of their home."
D2D94EA9E2E91F4DC226AE5CBFDECE5DD11C446AA87F81BAA2D39F81AE118A08 3. in November 2025
"This our second time hiring Allen for a remodel project. He did our kitchen in 2024 and it turned out great. This time it was two bathrooms which were completely remodeled. Allen is great to work with. I am always impressed with Allen's clear communication about what the project will involve and his ability to balance the needs of the homeowner with the needs of the project while the work is going on. This is especially important for my spouse and me since we both work from home. Not once did we ever feel like a burden while the work was going on. At the end of each day, the work areas are organized and neatened up so our home was still completely functional on evenings and weekends. I also appreciate how Allen manages all parts of the project. He deals with all the individual vendors and oversees all aspects of the work to ensure quality for the customer. This makes a complex renovation project much easier to cope with and why Allen is always our go to guy for home projects."
F96B28548CDE7A2C7C81AEB6C20508487197143A4C17A097D3766BC7A9F56ED3 C. in May 2026
Basement, Kitche, Foundation , and 2 more
"Nestor was great and professional and got the job done in one day. I will be reaching out to him for my next project."
9144A58D0EACECFA16B9B959DECCCA18C0678AA8083B6BCC3FBE870D88E6ED89 A. in February 2026
"Edgar and his team were a pleasure to work with. Fair price, communicated well and finished ahead of schedule. Would definitely recommend. I will be using them on our next project."
62225A7BA2DD43BBBF284F9F6F2D4863C150663F92DD0C6F7DF09E0E73464EB2 2. in August 2026

Remodeling
"Very good job, nice and clean ๐"
5FDA538F63CA58CCE0262CF6F99CBF260A1BAA4976EBA7B5FB6634FC7A5211E4 C. in August 2026
"Great experience working with Willis Builders and so happy with my updated bathroom. Tracy Willis was super supportive in helping with the design process while honoring my vision and Will and the crew did an amazing job putting it all together with meticulous attention to detail."
8B32860C68849B012DB9B9A1F0C11FBD7FCAD03140CFCFF63D5FFCF524A9115E 7. in September 2026
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Depending on the type of project, you may find subtle differences in the hiring process. Hereโs a look at task-specific advice.
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Your research doesnโt stop here. Once youโve found a few prospective companies, make an call to ask a few questions about work history, licensure and more:
In most cases, the responses you get to these three questions will give you a very good idea of the right pro for your project. If you have more than one front-runner, these additional questions can help you narrow it down.
Any good contractor will answer these questions, and most will appreciate dealing with a client that takes such an active interest in finding good service. On the other hand, if a contractor gives you a hard time with these questions, you probably want to find someone else.
Gaithersburg Addition & Remodeling Contractors are rated 4.8 out of 5 based on 120 reviews of 120 pros.
The HomeAdvisor Community Rating is an overall rating based on verified reviews and feedback from our community of homeowners that have been connected with service professionals. See individual business pages for full, detailed reviews.
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