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Unfinished Attic → Bedroom
Turn unused attic space into a code-compliant bedroom with proper egress, insulation, HVAC, and a finished look that adds real value to your home.
Cost Range
$20,000 – $60,000
Timeline
6–16 weeks
Materials Cost
$21,500
Permits Cost
$1,950
Verify the attic floor can support live loads (40 lbs/sq ft minimum). Measure ceiling height — most codes require 7.5 feet over at least 50% of the floor area. Plan egress window placement.
Estimated time: 5 days
If existing ceiling joists are undersized (common in older homes), sister new joists alongside the old ones or add bridging to meet structural code for bedroom use.
Estimated time: 7 days
Install an egress-compliant window (5.7 sq ft minimum opening). If ceiling height is insufficient, adding a dormer provides headroom and natural light.
Estimated time: 14 days
Install spray foam or rigid foam insulation between rafters. The attic bedroom will be against the roof, so proper insulation is critical for comfort and energy efficiency.
Estimated time: 5 days
Extend existing HVAC ductwork or install a mini-split. Run electrical for outlets, switches, and lighting. Hang and finish drywall on walls and ceiling.
Estimated time: 14 days
Install hardwood or carpet flooring. Add baseboards, window trim, closet framing, and paint. Install light fixtures, outlet covers, and closet doors.
Estimated time: 10 days
| Material | Est. Cost | Required |
|---|---|---|
| Spray Foam Insulation | $3,500 | Required |
| Egress Window | $1,500 | Required |
| Joist Reinforcement Lumber | $800 | Required |
| Drywall and Finishing Supplies | $1,500 | Required |
| Mini-Split HVAC Unit | $2,500 | Required |
| Electrical Wiring and Fixtures | $1,200 | Required |
| Hardwood or Carpet Flooring | $2,000 | Required |
| Dormer Construction (if needed) | $8,000 | Optional |
| Interior Door and Trim | $500 | Required |
Required for structural work and adding habitable space. Involves plan review and inspections.
$1,500
Required for new circuits and fixtures in the bedroom.
$250
Required for extending ductwork or installing new HVAC equipment.
$200