Remodeling Cost Calculator
Why Remodeling Estimates Always Seem to Grow
Ask a contractor for a remodeling quote and the number that comes back rarely matches the final bill, because materials and labor are only two-thirds of the story — the missing piece is contingency, the buffer set aside for the drywall rot behind a wall that nobody could see until demolition started. Building that buffer into the estimate from the outset, rather than treating it as a surprise later, is what separates a realistic budget from a hopeful one.
The Formula
Total = (Material Cost + Labor Cost) × (1 + Contingency%)
Where This Calculation Matters
- Setting a realistic budget before signing a contract — an estimate that skips contingency looks appealing but rarely survives contact with an older home's hidden problems.
- Comparing contractor bids on equal footing — one contractor's quote might already fold in a buffer while another's doesn't; running both through the same formula normalizes the comparison.
- Financing decisions — lenders and homeowners taking out a renovation loan need a total that includes contingency, not just the base scope of work.
- Room-by-room budgeting — kitchens and bathrooms typically carry higher per-square-foot costs than open living space because of plumbing, electrical, and finish density, which this calculator captures through the cost-per-square-foot input.
How Contingency Changes the Total
On a 200 sq ft remodel at $45/sq ft in materials plus $6,000 in labor:
| Contingency | Contingency amount | Total cost |
|---|---|---|
| 0% | $0.00 | $15,000.00 |
| 10% | $1,500.00 | $16,500.00 |
| 15% | $2,250.00 | $17,250.00 |
| 20% | $3,000.00 | $18,000.00 |
A 10-15% contingency is a commonly used starting point for standard remodels; older homes or projects involving structural, plumbing, or electrical unknowns often warrant a higher buffer.
How to Use This Calculator
- Enter the Area (sq ft) of the space being remodeled.
- Enter the Cost per sq ft for materials and finishes.
- Enter the estimated Labor Cost separately from materials.
- Adjust the Contingency % if you want a buffer different from the 10% default.
- Select Calculate to see the total estimated project cost, including the contingency amount.
Related Calculations
If your remodel includes painting, size the job with the Paint Coverage Calculator, or plan a countertop replacement with the Countertop Calculator.