Finishing a basement is often the cheapest way to add space in metro Denver, especially in 1950s ranches and in newer Highlands Ranch, Aurora and Castle Rock homes built with unfinished lower levels.
What basement finishing typically costs in Denver
| Scope | Typical range (estimate) | What that usually covers |
|---|---|---|
| Basic finish (900 sq ft) | $32,500 – $51,000 | framing, drywall, LVP, lighting |
| Mid-range + bathroom (900 sq ft) | $51,000 – $79,000 | adds a full bath, egress if needed |
| High-end (900 sq ft) | $83,500 – $130,000 | wet bar, theater, custom built-ins |
| Egress window (per opening) | $3,500 – $7,500 | Cut foundation, window well, window and drainage |
Planning estimates for typical projects, not quotes. Your bids will depend on size, condition, materials and permit requirements.
Code points that drive cost
- Any basement bedroom needs an emergency escape (egress) opening
- Many Front Range homes with expansive soils have floating (non-bearing) interior walls on the slab. Keep that design when you finish.
- Smoke and CO alarms, fire blocking and ceiling height requirements
Radon
Colorado has high radon levels statewide. Test before you finish, and if levels are high, installing a sub-slab mitigation system before walls go up is easier and cheaper.
Permits
Finishing a basement requires building, electrical, plumbing (if adding a bath) and mechanical permits in Denver and the suburbs.
Denver project cost estimator
Planning estimate
$45,300 – $70,000
Rough planning range only — not a quote. Real bids depend on site conditions, permits, materials and the contractor.
Basement Finishing: common questions
Can I finish a basement with a slab that has heaved?
Usually, but have the cause evaluated first. Floating walls and proper drainage help, and a structural engineer may need to review cracking.
Where we match basement finishing projects
Denver · Aurora · Lakewood · Arvada · Littleton & Centennial · Highlands Ranch · Parker & Castle Rock · Westminster & Thornton