Every cost range on CalcBid — in our guides, our calculators, and the numbers we suggest in the quote builder — is a planning estimate, not a bid. This page explains where the numbers come from, how we keep them current, and what they can and can't tell you.
Where the numbers come from
We compile each trade's cost ranges from publicly available sources that any reader can check:
- Retail material pricing. Published prices for lumber, tile, paint, shingles, fasteners, and other materials from national home-improvement retailers such as Home Depot and Lowe's, plus manufacturer list pricing where retail prices aren't published.
- Labor-rate benchmarks. Published wage data such as the Bureau of Labor Statistics' occupational wage surveys for construction trades, adjusted to reflect contractor billing rates — which run above hourly wages because they carry insurance, equipment, overhead, and profit.
- Industry cost references. Established remodeling and construction cost references that publish per-unit and per-square-foot ranges by trade and region.
We do not scrape competitors, and we don't present contractor-submitted leads data as if it were a national average. When a source informs a specific figure, the guide says so.
How ranges are built
- Low–high, not a single number. A “$5,000 roof” means nothing without the roof. We publish ranges (e.g. $8,000–$14,000) that reflect real-world variation in materials, scope, and market.
- Material, labor, and total are separated wherever the split is meaningful, so homeowners can see what's negotiable and contractors can see what their crews actually cost.
- Regional variation is real. The same job costs meaningfully more in coastal metros than in the rural Midwest. Our ranges reflect the national middle; the calculators let you dial in your own material and labor rates for your market.
How guides are reviewed and updated
Each guide is researched and written by the CalcBid Research Team, then checked against the calculator defaults for that trade so the two never disagree. We review cost figures on a rolling basis — the “Last updated” date on every guide tells you when its numbers were last checked. When material prices move sharply (lumber is the classic case), we re-verify the affected guides out of cycle.
What the numbers aren't
- Not a quote. A guide range is a starting point for budgeting or for sanity-checking a contractor's bid. It can't see your site conditions, access constraints, or the existing structure.
- Not a substitute for licensed advice. Structural, electrical, plumbing, and roofing work carries safety and code requirements that no calculator can assess. See our disclaimer.
Run your own numbers
The fastest way to beat the national average is to price your own job. Our free calculators use the same ranges, adjustable to your rates — then feed straight into the quote builder, no marketplace taking a cut in the middle.