Home Renovation Cost Calculator
Updated on 7 Nov 2026 · Checked by Aotob
Renovating 400 sq ft at a mid-range finish would cost about $57,120.
That’s $143 per sq ft, including a 15% contingency.
Estimated renovation cost
$57,120
Kitchens and bathrooms cost two to three times more per area than bedrooms or living rooms. Older homes hide surprises behind walls, so keep the contingency at 15% or more.
Show the working
400 sq ft × 110 × 1 = 44,000
+ fees 3,520 + contingency 6,600 + tax 0 + 3,000 = 57,120
Basic, mid-range and high-end
| Finish | Per sq ft | Total |
|---|---|---|
| Basic | 102 | 40,884 |
| Mid-range | 143 | 57,120 |
| High-end | 224 | 89,592 |
Questions people ask
How much does renovation cost per square foot?
In the US a mid-range renovation is often $100 to $200 a square foot, and kitchens and bathrooms $250 or more. In the UK a full refurbishment is often £1,000 to £2,000 a square metre. Prices vary a lot by region.
How big should the contingency be?
10% for newer homes, 15% to 20% for older homes where wiring, plumbing or structure might need work.
Do I need planning permission?
Usually not for internal work, but structural changes, extensions and work on listed or historic buildings need approval and building regulations sign-off.
Updated 7 Nov 2026Source: Typical rates, checked November 2026; replace them with your quotesChecked by AotobAn estimate from typical rates; your quotes will differ.Report an issue