O'Keefe Built
“Pat and his team at O'Keefe Built completed these two elements of the project expertly and extremely efficiently even when battling weather elements during the winter.”
Best Deck Builders in Longmont, CO
24 companies listed · 12 in Longmont · 1 open 24/7 · 12 open weekends · 19 rated 4.5+
Data verified October 28, 2026
Colorado Fence Crafters
“We are very happy with the end products of their work and have received many compliments on the beauty of the designs and the quality of the structures.”
Josh Brooks Construction and Renovation
“We will absolutely use them for future projects and would 100% recommend them to anyone looking to have great work done by great people all across the board.”
SJ Ward Landscapes
“Chava and crew members revisited the site twice after the job was completed to do some follow up work, and to make sure I was satisfied with their work.”
Master Touch Remodeling
“He is a very reliable person, kind and careful in his work, satisfaction guaranteed.”
Schwabees Landscaping and Construction
“Schwabees did a great job of transforming my yard from a time consuming mess into a xeriscaped garden that looks great and will allow me to spend my time doing something I enjoy instead of working in the yard.”
Listed for homeowners in and around Longmont, CO, these 24 companies design and build decks. What each one says about framing, materials and permits comes from its own website; the ratings and comments on this page come from public reviews.
Area overview: Longmont, CO
12 of the 24 companies we list are based in Longmont; the other 12 serve Longmont from Boulder (13 mi), Fort Lupton (13 mi) and Brighton (19 mi). 23 of the companies on this page have a rating, from 4.0 to 5.0 across 966 reviews; 5 have 50 or more reviews and 19 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise quality (93%), professionalism (91%) and responsiveness (81%). The topics that come up most in reviews of the companies on this page are "communication" and "price". 1 is open around the clock; 12 are open on Saturdays and 4 on Sundays. 5 show a license on their websites and 1 has a BBB rating of A or A+. Domain records put 12 websites of the companies on this page at ten or more years old; the oldest dates from 2009. 1 offers emergency call-outs; 4 offer financing or payment plans; 11 give free estimates and 5 are family- or locally-owned. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
What should I look for on a deck builder's site?
All 24 deck builders shown here list a website. Look past the finished photos for pictures taken during framing. Joist layout, hardware and how the ledger was flashed tell you how the company builds, and those photos are the ones a careful builder is proud to publish.
Environmental Systems Design
“Paul is very professional !”
High Country Decks
“We visited with and received project bids from multiple vendors, and Tim and Megumi not only listened to our needs and insights more than any other vendor, their project bid was highly detailed and clear.”
Transcendent Construction
“He's very knowledgeable and did a great job installing our shower door.”
Murphy Construction Services
“They did our kitchen remodel that turned into scope creep with bathroom updates, stairway update, pantry update, general house electrical updates and other odds and ends.”
TCS Solutions
Decksteriors Inc
“The sanding step is a pretty messy process but I have to say I was surprised that you could barely tell they had been here when they were finished, except we had beautiful decks and a beautiful porch.”
Decks By Caio in Boulder
“Great ideas and advice at the beginning, willing to listen to my position on pricing, and a first class job undertaken while I was away, on time and looking great.”
Northern Lights Exteriors
“From project manager Mack, to installers Anthony and his crew and everyone in the office, their entire team were extremely accommodating and professional.”
Bedrock Landscape LLC
“I called the phone number on their website and received an estimate by the next day, the price was competitive and very fair compared to other companies.”
Jr's Landscaping Services
“They were the first company to get back to us and come out to get us a quote, they were able to come out the soonest to lay sod, and were competitive with their prices.”
Cosman Construction
“Alex did an excellent job from start to finish; It looks great from the black railing on top to the beautiful hardware anchoring the posts to the foundation at the bottom.”
Greenview Solutions
“We had several add-ons throughout this project, and Green View delivered everything with professionalism, respect, guidance and how to troubleshoot the new equipment.”
Ironwood Deck LLC
“When we had concerns a year later over a post and casson shifting cause of the ground settling, he came back to adjust it and make sure it was not shifting.”
Advanced Roofing and Decking Solutions
“We had them replace our roof and are very satisfied with the work they did.”
Running Rabbit Home Building Inc
“Everything was done within budget and on time, and we would recommend them to anyone who is looking for a quality renovation team in the Boulder County area!”
Adams Unlimited Construction
“Had Adams Unlimited Construction out to remodel my basement in a new home we just bought a few months back, the experience was smooth and without issue and cost was reasonable.”
Boulder Decks
“Due to the materials and craftsmanship, I can't imagine I'll ever need another deck, so I'm glad I can support the business by sharing with others how great my experience has been.”
High Peaks Custom
“Not as simple as it looks- there were old rotten posts buried in and surrounded by cement to carve through and a tight workspace including huge tree roots, sprinkler head and cement curb!”
Why these companies made our list
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