Basement Finishing Boulder CO — 2026 Costs & Trusted Contractor
Boulder homeowners have some of the highest home values in Colorado — and one of the best ways to maximize that value is finishing an unfinished basement. Josh Brooks Construction and Renovation Inc. finishes basements throughout Boulder County with the same full-service, licensed approach that makes us Northern Colorado’s most trusted general contractor.
Basement Finishing Costs in Boulder CO 2026
- Basic open-concept finish (drywall, flooring, lighting, egress): $35–$55/sq ft
- Mid-range finish with bedroom and bath: $55–$80/sq ft
- Premium finish with wet bar, home theater, or ADU: $80–$120/sq ft
A 1,000 sq ft Boulder basement typically runs $45,000–$90,000 for a complete, permitted finish with a bedroom, bathroom, and living area. Boulder’s higher cost of living means both labor and materials trend slightly higher than Longmont, but the return on investment is also higher given Boulder’s property values.
What Boulder County Requires for Basement Finishing
- Building permit from the City of Boulder or Boulder County
- Egress window in every sleeping room (minimum 5.7 sq ft opening)
- GFCI outlets in all wet areas
- Smoke and CO detectors
- Proper ceiling height (7′ minimum for habitable space)
- Radon mitigation system if not already installed
Josh Brooks Construction manages all permits, inspections, and code compliance as part of our basement finishing projects. We never suggest skipping the permit process.
Popular Boulder Basement Configurations
- Legal bedroom suite with egress and full bath — excellent for rental income
- Home office and study with separate entrance
- Media room with wet bar and guest suite
- Full ADU (accessory dwelling unit) for long-term rental
Free Boulder Basement Consultation
Call 720-828-7997 | 2167 Frontier St, Longmont, CO 80501 | Boulder County Licensed CON-25-0089 | Veteran-Owned | Senior & Veteran Discounts