Renovation Cost Calculator
Estimate a renovation budget range from square footage, project type, finish quality and region, with a midpoint, contingency reserve and cost per square foot.
By CalcBuilt Editorial TeamUpdated September 9, 2026Formulas checked against manufacturer specs, see how we calculate.
Results
- Estimated cost range
- $100,000 to $200,000
- Whole-house gut renovation, mid-range finishes, national average. Broad national planning range, not a quote
- Midpoint estimate
- $150,000
- $172,500 with the 15% contingency added
- Contingency reserve (15%)
- $22,500
- Set aside for hidden damage, code upgrades and change orders; not part of the bid
- Cost per square foot (midpoint)
- $150.00 per sq ft
- Range $100.00 per sq ft to $200.00 per sq ft
Renovation Cost formula
Low estimate = Area (sq ft) x low cost per sq ft x quality factor x region factor
High estimate = Area (sq ft) x high cost per sq ft x quality factor x region factor
Midpoint = (Low + High) / 2; Contingency = Midpoint x contingency %
Cost per sq ft = Midpoint / AreaWorked example
A 200 sq ft kitchen remodel with high-end finishes in a high-cost metro and a 20% contingency: the combined factor is 1.5 x 1.3 = 1.95. Low estimate is 200 x $150 x 1.95 = $58,500 and high is 200 x $350 x 1.95 = $136,500. The midpoint is ($58,500 + $136,500) / 2 = $97,500, the contingency is $97,500 x 0.20 = $19,500, and the all-in planning number is $117,000.
Cost per square foot at the midpoint is $97,500 / 200 = $487.50, which is why kitchens are budgeted per project rather than per foot: cabinets, appliances and plumbing crowd a small footprint.
Quick reference
| Project | Range (mid-range) | Budget midpoint | Mid-range midpoint | High-end midpoint |
|---|---|---|---|---|
| Whole-house gut renovation | $100 to $200 | $112.50 | $150.00 | $225.00 |
| Kitchen remodel | $150 to $350 | $187.50 | $250.00 | $375.00 |
| Bathroom remodel | $250 to $500 | $281.25 | $375.00 | $562.50 |
| Basement finishing | $30 to $75 | $39.38 | $52.50 | $78.75 |
| Room refresh, paint and flooring | $10 to $25 | $13.13 | $17.50 | $26.25 |
| Home addition | $150 to $400 | $206.25 | $275.00 | $412.50 |
What drives renovation cost
Square footage sets the scale, but the type of room sets the rate. A room refresh is paint, flooring and trim, so it costs a few dollars per foot. A gut renovation strips to the studs and replaces mechanicals, drywall and finishes. Kitchens and baths stack cabinets, countertops, tile, fixtures, plumbing and electrical into a small footprint, which is why their per-foot cost is two to three times a gut job. Additions add foundation, framing and roofing on top of all that.
Finish quality is the biggest lever you control. Stock cabinets, laminate counters and vinyl plank sit at the budget end; semi-custom cabinets, quartz and tile are mid-range; custom millwork, stone and designer fixtures push a project to 1.5 times the base or more. Region matters almost as much because labor is a third to a half of the bill, and trades in large coastal metros bill far above the national average.
Getting bids and holding a contingency
Use this range to decide whether a project is realistic, then get at least three written bids from licensed contractors on the same scope of work. Make sure each bid lists the same allowances for cabinets, fixtures, tile and appliances, or the numbers will not be comparable. A bid far below the others usually means a missing item, not a bargain.
Keep the contingency out of the contractor's contract and in your own account. Older houses reveal rot, knob-and-tube wiring, undersized plumbing or asbestos once walls open, and inspectors may require code upgrades you did not plan for. Spending the reserve is normal; not having one is how projects stall halfway.
Key facts
- Lenders and contractors commonly recommend a 10 to 20 percent contingency, and 20 percent or more for houses built before 1970 where wiring, plumbing and asbestos surprises are likely.
- Kitchens and bathrooms carry the highest cost per square foot of any room because cabinets, fixtures, tile, plumbing and electrical are packed into a small area.
- Labor is typically 30 to 50 percent of a remodel budget, so labor rates drive most of the difference between regions.
- An addition costs more per square foot than remodeling the same area because it needs a foundation, framing, roof and exterior walls before any finish work.
- Architect and design fees, when used, commonly add 8 to 15 percent of construction cost and are not included in per-square-foot figures.
Frequently asked questions
How much does it cost to renovate a 1,000 sq ft house?
A whole-house gut renovation with mid-range finishes typically runs $100,000 to $200,000 at national-average pricing, with a $150,000 midpoint. Cosmetic work on the same area is closer to $10,000 to $25,000.
How much contingency should I budget for a remodel?
10 to 20 percent of the estimate. At the default 15 percent, a $150,000 midpoint carries a $22,500 reserve for a $172,500 all-in planning budget.
Why is the estimated range so wide?
Per-square-foot costs vary with structure, finishes and local labor. The low end assumes simple layouts and stock materials; the high end covers moving walls, relocating plumbing and premium finishes. Bids narrow it.
Are permits and design fees included in these numbers?
No. The ranges cover labor and materials. Permits are usually a small percentage of the job, and architect or designer fees, when used, commonly add 8 to 15 percent.
Sources and references
- 2025 Cost vs. Value Report (Zonda)
- 2025 Cost vs. Value Report: Key Trends (Journal of Light Construction)
- Drivers of Remodeling Spending (NAHB)
Next steps for this project
The usual order for a measurement & cost project. See all measurement & cost calculators.
Results are estimates based on standard formulas and typical product specifications. Confirm quantities with your supplier and local code before ordering.