REMODELING
How to Estimate an Attic Conversion
Contractor method for estimating attic conversions: area, scope, structure and the bathroom line.
Attic conversion bids fail on the scope and the structure. The area is easy math; basic, full and turnkey are very different prices, and a structure change or bathroom grows the quote fast.
THE SHORT ANSWER
How do you estimate an attic conversion?
Measure the area, choose the scope (basic $45, full $120, turnkey $150/sq ft), then add structure change and bathroom. A 400 sq ft full conversion runs about $48,000.
Measure the livable area
Measure the livable area in sq ft and note the headroom. A basic finish runs ~$45/sq ft, a full conversion ~$120 and a turnkey ~$150. Confirm the floor and ceiling height.
- Measure the usable floor area
- Check headroom and roof slope
- Note existing insulation and wiring
- Confirm the stair access
Pick the scope
Basic covers finishes; full includes systems and finishes; turnkey handles everything. A structure change to gain headroom adds ~$30/sq ft.
Price the bathroom
Adding a bathroom adds ~$12,000. Use the Attic Conversion Cost Calculator to build the full quote, then add any HVAC or window work.
Check the total
Your total should land within 10% of the calculator output before markup. A full attic conversion runs $100-$200/sq ft.