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Why Boulder Homeowners Trust Cosman Construction for Expert Additions & Home Remodeling
At Cosman Construction, we've built our reputation since 2013 as Boulder's premier deck & general contractor. We're expanding our expertise to bring that same attention to quality and craftsmanship to home renovations and additions, from whole-home remodeling to custom new rooms and thoughtfully designed additions. For more information regarding our other services including Decking, Railing, & Additional Options reach out to learn more.
Why Choose Us for your Addition or Home Remodeling Project?
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Deep Local Experience - We understand Boulder County permitting, building standards, and the look/feel that fits the front range.
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Licensed & Highly Rated - Active General Contractor License (LIC-01003395) with a strong BuildZoom score placing us in the top tier of Colorado contractors.
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Owner-Led Quality - Alex Cosman personally oversees every stage, ensuring nothing is overlooked.
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Proven Track Record - Permits for residential additions and home remodels in Boulder back up our results.
Whole-Home & Room Remodels
Whether you're reimagining a single room or taking on a full-home transformation, we bring expert craftsmanship, thoughtful design, and close attention to detail. From modernizing older layouts to improving energy efficiency and flow, we help you create a home that reflects your lifestyle and enhances everyday living.
We take the time to protect the rest of your home near the construction area to minimize clean up.
Additions & Expansions
Need more space? We specialize in seamless home additions—from extra bedrooms and expanded living areas. Our team navigates Boulder County’s zoning and permitting process with ease, ensuring your new space is fully integrated, code-compliant, and built to last.
Design-Build Delivery
Our design-build model keeps your project simple and efficient. We handle everything—from the initial concept to the final build—under one roof, eliminating miscommunication and delays. With Alex Cosman personally involved throughout, you get a cohesive, well-managed project with results you can count on.
Your Local Boulder Home Remodel & Addition Experts
Step 1
Contact Us
Submit a contact form, call, or text us.
Step 4
Estimates & Permits
You get a clear estimate, and we handle all permitting.
Step 2
Consultation
We visit your home to discuss your goals and evaluate the space.
Step 5
Construction
Our team builds efficiently with top-tier craftsmanship.
Step 3
Concept & Design
We create a custom design that fits your vision and local codes.
Step 6
Final Inspection
We ensure everything meets standards and your satisfaction.
You've Got Questions, We've Got Answers
Q: What Permits are needed for remodels & additions in Boulder?
A: We handle all Boulder County permitting.
Q: How long does a kitchen remodel or addition take?
A: Remodels take 8-12 weeks, additions take 12-24 weeks.
Q: Are your licensed & insured in Colorado?
A: Yes - General Contractor license LIC-01003395
Ready to Expand Your Home? Request A Quote
Contact Cosman Construction to discuss your addition or remodel vision. We deliver a smooth, high-quality experience from design through completion with the integrity Boulder homeowners deserve.