← ALL SERVICES

Basement Finishing Contractor in Denver

Turn your unfinished Denver basement into the most used room in your house.

An unfinished basement is thousands of square feet of untapped potential. In Denver's housing market, finishing your basement is one of the most cost-effective ways to add living space, increase your home's value, and create rooms your family actually uses — bedrooms, bathrooms, home offices, home theaters, playrooms, or guest suites.

Basement finishing in Denver typically costs between $30 and $75 per square foot, depending on the complexity. A basic 1,000 sq ft finish (framing, drywall, flooring, lighting, egress) runs $30,000–$50,000. A full buildout with a bathroom, wet bar, and premium finishes can reach $60,000–$100,000+. We provide detailed, itemized estimates before work begins.

Denver basements come with specific challenges that require local expertise: moisture management in Colorado's semi-arid climate (yes, basements still get wet here), radon mitigation requirements, proper egress windows for bedrooms, and HVAC ductwork routing. Our team has finished hundreds of Denver basements and knows how to handle every one of these issues correctly.

We handle the complete project: design consultation, permit applications, framing, electrical, plumbing (if adding a bathroom), HVAC modifications, insulation, drywall, flooring, trim, painting, and final inspections. One contract, one team, one point of contact throughout the build.

WHY DENVER HOMEOWNERS CHOOSE 303 CONSTRUCTION

20+ years of Denver basement finishing experience

Moisture management and radon mitigation expertise

Egress window installation for code-compliant bedrooms

Full bathroom and wet bar additions

Permit handling and inspection coordination

Detailed estimates with no surprise costs

OUR PROCESS

1
1

Free Consultation

We assess your basement, discuss your vision, review any moisture concerns, and provide an estimate.

2
2

Design & Planning

We create a layout that maximizes your space and meets building code requirements.

3
3

Permits

We pull all required building permits and schedule inspections throughout the project.

4
4

Construction

Framing, electrical, plumbing, HVAC, insulation, drywall, flooring, trim, and paint — all under one roof.

5
5

Final Walkthrough

We walk through the finished basement together, address any items, and pass all city inspections.

FREQUENTLY ASKED QUESTIONS

Common questions from Denver homeowners about this service.

Basement finishing in Denver costs $30–$75 per square foot. A basic 1,000 sq ft finish runs $30,000–$50,000. Adding a bathroom, wet bar, or premium finishes pushes costs to $60,000–$100,000+. We provide free, itemized estimates.
Yes. All basement finishes in Denver require a building permit. The work involves electrical, potentially plumbing, and egress requirements. 303 Construction handles all permit applications and inspection scheduling.
Yes. Finished basements in Denver typically return 70–80% of the investment at resale. More importantly, they add functional living space in a market where square footage is expensive. A well-finished basement with a bathroom can add $40,000–$80,000 to your home's value.
Radon levels in the Denver metro are commonly elevated. We install or accommodate radon mitigation systems as part of every basement finish. If your home doesn't have a radon mitigation system, we can install one during construction.

Get a Free Estimate

Every project is different. Tell us what you need and we'll give you an honest estimate — free, no obligation.

CALL (303) 915-3575