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Cosman Construction
About the business:
In the heart of Boulder, we are Cosman Construction – your reliable partner in transforming homes. Specializing as a General Contractor and Deck Builder, we pride ourselves on delivering quality craftsmanship that elevates living spaces.
Our mission is to serve local homeowners with unparalleled dedication and expertise. We strive to create lasting impressions through our commitment to detail, use of premium materials, and a keen eye for design. Our services span from general contracting projects to custom deck building, ensuring that your vision becomes reality.
Join us in crafting exceptional homes, where every project reflects our dedication to excellence and our deep-rooted connection with the Boulder community. Choose Cosman Construction – where quality meets passion.
Services:
All services 2-
General Contractor
Book from $50In a homeowner's quest for renovations or repairs, we, Cosman Construction in Boulder, are your reliable general contractors. We offer …
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Deck Builder
Book from $50In Boulder, we craft custom decks that seamlessly blend with your home's exterior, enhancing its curb appeal. Our experienced team …
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Hours of operation
- Mon – Fri
- Sat – Sun
- 8:00 AM – 6:00 PM
- 9:00 AM – 5:00 PM
Latest reviews
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K.K. DuVivier10 June 2026
Quality should be Alex Cosman’s middle name. I originally hired Cosman Construction to build me a rustic screened deck, and the project evolved into a wonderful 3-season glassed-in addition—far exceeding my expectations!
Their attention to detail is extraordinary, and their rigor in supervising subcontractors is awesome. Finally, communication was excellent: they always let me know what to expect and consulted me along the way. In my experience this is a rare and welcome quality for contractors.
I’m a professor by trade, and overall, I would give Cosman Construction a resounding A+!
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Shawn Crespi10 June 2026
Alex conducted himself very unprofessionally. Would advise against using.
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Ryder Mayfield10 June 2026
Great Deck and Fence contractor! I would highly recommend to anyone living in Boulder County
