Frequently asked questions.
Everything you need to know about our home improvement planning and calculation databases.
How are the cost estimates calculated?
Each calculator starts from a configured baseline low/average/high cost per unit for that project type, then applies a material multiplier (your chosen tier), a labor-complexity multiplier, and your state's labor and material multipliers. The full formula and current baseline numbers are on our Methodology page.
How accurate are the estimates on Project Budgeter?
They're a reasonable starting point for budgeting and sanity-checking contractor bids, not a precise quote. Local supply conditions, seasonal contractor demand, site-specific complications, design customizations, and permit fees all move the final number, sometimes significantly.
Should I trust these calculators over a contractor's bid?
No. A bid from a local licensed contractor who has actually inspected your property is always the final authority. Our calculators exist to help you sanity-check that bids fall within a normal range for your area and project scope — not to replace the bid itself.
Why is my contractor's quote higher than the calculator estimate?
Common reasons: your property has site-specific complications (poor access, structural surprises, code-driven upgrades) our general formula can't see; the contractor is pricing in permits, disposal, or a warranty that our 'what's excluded' list doesn't cover; local demand is high right now; or the contractor's overhead and insurance costs are simply above our state-level average. A quote 10–20% off our range is normal; if it's off by much more, ask the contractor for an itemized breakdown so you can see exactly where the difference is.
Do your calculations include permit costs?
No. Permit and inspection fees depend on county and municipal regulations, ranging from roughly $50 for simple window upgrades up to $2,000+ for structural additions. We advise factoring in an extra 5% to 10% for municipal approvals.
How often is the pricing data updated?
The baseline figures are reviewed periodically, not pulled from a live pricing feed. The values currently shown were last reviewed for 2026 — see the Methodology page for the exact review date and process.
Why do some states have much higher estimates?
States like California, Hawaii, New York, and Massachusetts carry higher labor multipliers in our model (roughly 1.25x to 1.50x) reflecting generally higher cost of living, insurance, and regional logistics costs. These are configured estimates, not a live wage survey — see the Methodology page for how they're set.
Can I use this for a commercial or multi-unit project?
The calculators are calibrated for typical single-family residential projects. Commercial buildings, multi-unit properties, and large-scale developments involve different code requirements, labor agreements, and material sourcing, so our estimates are not a reliable baseline for those — talk to a commercial contractor or estimator instead.
What should I ask a contractor before accepting a quote?
At minimum: is this a fixed price or a time-and-materials estimate; what's explicitly included and excluded (permits, disposal, cleanup); what's the payment schedule; are they licensed and insured for this type of work in your state; and what happens if they find a hidden problem (like rot or bad wiring) once work starts. See our guide on comparing contractor estimates for a fuller checklist.