Do I Need a Permit to Finish My Basement in Colorado?
Quick Answer
Yes — any framing, electrical, plumbing, or mechanical work requires a permit.
Colorado-specific rules
Colorado has no statewide building code (home rule — editions vary by city; confirm your jurisdiction's). The statewide energy floor under HB22-1362 (2022) requires a jurisdiction adopting or updating a building code between July 1, 2023 and July 1, 2026 to meet at least the 2021 IECC plus the state's electric-ready, EV-ready, and solar-ready provisions.
Sources: Colorado HB22-1362 (2022) — statewide energy code floor
What Requires a Permit
Framing walls, adding electrical circuits, installing plumbing, and modifying HVAC in a basement all require a building permit. Cosmetic work — painting, laying floating floors over existing concrete, and adding furniture — does not.
Egress Windows Are Non-Negotiable
Every basement bedroom must have an egress window: minimum 5.7 sq ft net clear opening, sill no higher than 44 inches above the floor (the IRC standard most jurisdictions follow). Window wells deeper than 44 inches need a permanently attached ladder or steps. This is a life-safety requirement — inspectors will not pass a basement without proper egress.
The Four Inspections
Expect four inspections: framing (walls, fire blocking, egress openings), MEP rough-in (electrical, plumbing, HVAC before walls are closed), insulation (exterior walls, vapor barrier), and final (drywall, fixtures, smoke/CO detectors). Do not close walls before passing framing and rough-in inspections.
Common Mistakes
Enclosing the furnace room without combustion air supply, skipping egress windows in bedrooms, not adding enough electrical circuits (you'll want dedicated circuits for the bathroom and any kitchen/wet bar), and forgetting smoke detectors in every bedroom and outside sleeping areas.
Bottom Line
Yes, you need a permit. The biggest requirement is egress windows for bedrooms. Budget 4 inspections and don't close walls before passing rough-in.