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.

Quick answer: Multiply the floor area by the typical cost per square foot range for the project type, then scale for finish quality and region. A 1,000 sq ft whole-house gut renovation at mid-range quality and national-average pricing runs about $100,000 to $200,000, with a $150,000 midpoint and a $22,500 contingency at 15%.

Your measurements

Plan view from above: area is length times width.

Area being renovatedsq ftFloor area of the rooms in the project, not the whole house unless it is a whole-house job. Under about 100 sq ft the per-foot figure understates a kitchen or bath; budget those as a project.Project type (typical cost per sq ft)Typical 2026 US ranges for labor and materials at mid-range finish, before permits, design fees, lead or asbestos work and the contingency. Bids on your scope replace them.Finish qualityBudget is stock cabinets, laminate and vinyl plank; mid-range is semi-custom cabinets, quartz and tile; high-end is custom millwork, stone, moved walls and relocated plumbing.RegionLabor is 30 to 50 percent of the bill, so this tracks trade rates. The Bay Area, New York, Boston, Seattle and Hawaii run 1.3 or higher; most of the South and Midwest run 0.85.Contingency reserve%10 to 20% is standard; use 20% or more for homes built before 1970 or any project that opens walls.

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Estimated cost range$100,000 to $200,000All results

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 / Area

Worked 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

Typical cost per square foot by project type and finish quality (national average, midpoint of range)
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 three written bids from licensed contractors on one scope document. That document is drawings or a room-by-room list, the allowances for cabinets, counters, tile, fixtures and appliances, and who pulls the permits. Check the license with the state board and get the liability and workers comp certificates from the insurer, not from the contractor. A bid 20 percent under the others is missing something, usually the panel upgrade, the subfloor or the permit. Permits typically cost 0.5 to 2 percent of the job value; the mechanical, electrical and plumbing permits are pulled by the licensed subs, and inspections come at rough-in and final.

Keep the contingency out of the contract and in your own account. Older houses reveal rot, knob-and-tube wiring, undersized plumbing or asbestos once walls open, and inspectors require code upgrades such as AFCI breakers, a bath fan or tempered glass at the tub. Pay on milestones, not calendar dates, with a lien waiver at each draw and 5 to 10 percent held to the punch list. Some states cap the deposit, California at 10 percent or $1,000. Every change is a written change order with the price and the schedule days before the work proceeds. Spending the reserve is normal; not having one is how projects stall halfway.

What this calculator leaves out

Permits and plan review, architect or designer fees of 8 to 15 percent, and engineering for any wall that comes out. Lead or asbestos abatement, the dumpster (typically $400 to $700 per 20 yard pull), and a temporary kitchen or a rental during a gut job. Appliances and fixtures above the allowance, landscaping and driveway repair after an addition, sales tax on materials where it applies, and financing costs. It also does not price a 5 x 7 bath or a galley kitchen correctly by the foot; those are bid as a project.

Mistakes that cost money

Comparing bids with different allowances: a $3,000 tile allowance against $8,000 hides $5,000; get a line-item scope and equal allowances.
Verbal change orders: every change gets a signed price and days added before the work proceeds; 15 to 25 percent markup on changes is normal.
Spending the contingency on upgrades in week two: the rotted rim joist and the panel the inspector flags show up in week four.
Skipping the permit: unpermitted work surfaces at sale and the buyer or city can require walls opened; permits typically run 0.5 to 2 percent.
Pricing a 5 x 7 bath by the foot: fixtures do not scale, and a hall bath typically runs $15,000 to $35,000 as a project.
Pre-1978 paint and pre-1980s flooring or plaster: EPA RRP lead rules and asbestos testing apply; abatement is a separate line, typically $2,000 to $10,000.

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.

How should I pay a contractor for a remodel?

A deposit of 10 percent or less at signing; California caps it at 10 percent or $1,000, whichever is less. Then draws tied to milestones such as demolition, rough-in inspection passed, drywall and cabinets set, with a conditional lien waiver from the contractor and the major subs at each draw. Hold 5 to 10 percent until the punch list and final inspection are done. Never pay ahead of the work in place, and pay by check or transfer, not cash.

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)

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