How to Estimate a Home Renovation Budget from Square Footage
October 8, 2026
Renovation cost estimates typically start from a cost-per-square-foot range for the specific type of project, multiplied by your space's square footage — but that range alone can span 3-4x depending on material and finish quality, which is why a square footage number is only a starting point, not a final budget.
Skip the math and get your answer instantly:
Open the Square Footage Calculator →Typical Cost-Per-Square-Foot Ranges
| Project Type | Budget Range | Mid/High-End Range |
|---|---|---|
| Kitchen remodel | $75-150/sq ft | $150-350+/sq ft |
| Bathroom remodel | $100-200/sq ft | $200-450+/sq ft |
| Flooring (materials + install) | $3-8/sq ft | $8-20+/sq ft |
| Interior painting | $1.50-3/sq ft | $3-6/sq ft |
| Whole-home renovation | $50-100/sq ft | $100-250+/sq ft |
Worked Example
A 200 sq ft kitchen at a budget-to-mid-range estimate of $100/sq ft comes to roughly $20,000 — but the same kitchen at a higher-end finish level ($250/sq ft) comes to $50,000. The square footage didn't change; the cost-per-square-foot assumption did, which is why that single input drives most of the uncertainty in a rough estimate.
Why the Range Is So Wide
Material choice (laminate vs. quartz countertops, vinyl vs. hardwood flooring) typically accounts for the largest swing in cost-per-square-foot. Labor costs also vary significantly by region and contractor. Structural changes (moving plumbing, removing walls) add costs that a flat per-square-foot rate doesn't capture well, since they're tied to the specific change, not the room's total area.
Building a More Accurate Budget
Use a per-square-foot estimate only for an initial ballpark, then get itemized quotes from contractors once you've chosen a finish level — materials, labor, and permits are usually quoted separately and add up to a more precise number than a single blended rate. Always add a contingency (commonly 10-20%) for unexpected issues, especially in older homes where hidden problems (outdated wiring, water damage) are common once walls or floors are opened up.
Frequently Asked Questions
What's a reasonable cost per square foot for a kitchen remodel?
Budget remodels typically run $75-150 per square foot, while mid-to-high-end remodels with premium materials and custom work can run $150-350+ per square foot — the range depends heavily on cabinet, countertop, and appliance choices.
Why do renovation estimates vary so much for the same square footage?
Material and finish quality (budget laminate vs. premium stone, for example) typically drives the largest swing in per-square-foot cost, followed by regional labor rates and any structural changes like moving plumbing or electrical, which aren't well captured by a flat per-square-foot rate.
Should I add a contingency to my renovation budget?
Yes — a 10-20% contingency is standard practice, especially for older homes, since opening up walls or floors often reveals unexpected issues (outdated wiring, water damage, structural problems) not visible during initial planning.
Is per-square-foot pricing accurate for small rooms like bathrooms?
Less so — small rooms like bathrooms have a high proportion of fixed-cost items (toilet, vanity, shower) relative to their square footage, so per-square-foot estimates tend to run higher for small spaces than for larger rooms with the same finish level.
How do I get a more accurate number than a per-square-foot estimate?
Use the per-square-foot range only for initial budgeting, then request itemized quotes from contractors once you've settled on a finish level — a detailed quote breaking out materials, labor, and permits will be far more accurate than any blended average rate.