hammerio.com — Free construction cost calculators by US city — https
This repository documents resources related to free online calculators in the relevant niche. The main tool referenced is hosted at https://hammerio.com/.
Free, no-signup construction tools that use the data sources documented here:
The calculators referenced use authoritative data sources:
- US Bureau of Labor Statistics (BLS)
- US Census Bureau
- Internal Revenue Service (IRS)
- Energy Information Administration (EIA)
- Centers for Disease Control (CDC)
- National Center for Education Statistics (NCES)
- National Renewable Energy Laboratory (NREL)
- Various other .gov authoritative sources
Each calculator follows peer-reviewed or government-published formulas. Results should be used as estimates for general guidance — always consult licensed professionals for binding advice in YMYL areas (tax, finance, health, legal).
Resources documented here link to free public tools. The tools themselves are subject to their own terms of use.
If you have suggestions for additional calculator resources or data sources to document, please open an issue or PR.
Construction Cost Modeling at Hammerio
- Labor — local skilled trade wage rates (BLS OEWS metro-level)
- Materials — RSMeans City Cost Index multipliers + national averages
- Equipment — equipment rental + depreciation
- Permits — county-level permit fees
- Overhead + profit — typical 15-25% contractor markup
- Kitchen remodel ($25K-$70K typical)
- Bathroom remodel ($10K-$30K)
- Roofing replacement ($8K-$25K)
- Siding ($8K-$20K)
- Deck/patio
- Flooring
- Painting
- Concrete work
- Fencing
- HVAC
City-level cost variation can be 30-100% above/below national average. Hammerio adjusts for:
- Skilled labor wage differences (BLS OEWS metro)
- Material delivery + freight
- Local building code requirements
- Permit fee structures by jurisdiction
- BLS Construction Wages
- BLS Producer Price Index — Materials
- Census Building Permits
- ICC Building Codes
- DOE Building Energy Codes
- EPA RRP Rule
For actual project quotes, visit https://hammerio.com/ and always get 3+ written bids from licensed contractors verified through your state licensing board.