Our methodology is designed to make home-project information understandable and auditable. We prefer transparent assumptions and ranges over false precision.
1. Define the project scope
Before discussing cost, we identify what the project actually includes. A roofing job, bathroom renovation or heating replacement can mean very different things depending on removal work, access, materials, permits, repairs to hidden damage and finish level.
2. Separate measurable inputs from market prices
Where possible, calculators use inputs the homeowner can verify: dimensions, waste percentage, watts, hours of use, tariff rate, quoted price or contingency. This reduces reliance on generic averages.
3. Treat prices as ranges
When price guidance is published, it should be presented as a planning range with the location and time period made clear. We avoid implying that a national average is a local contractor quote.
4. Distinguish USA and UK context
U.S. and UK pages use the relevant currency, terminology and regulatory context. We do not create UK guidance by simply converting a U.S. dollar figure into pounds, or vice versa.
5. Review the cost drivers
- Project size and measured quantity
- Material or equipment specification
- Property age and condition
- Access, height and complexity
- Removal, disposal and making-good work
- Permits, inspections and professional services
- Regional labour and supplier conditions
- Urgency and project scheduling
6. Update when assumptions change
Pages should display a last-updated date when substantive content is revised. Major changes to calculation logic or data assumptions should be reflected in the article or methodology notes.
7. Keep professional boundaries clear
Cost information is not a substitute for inspection, engineering, electrical, gas, building-control, planning, legal or other professional advice. Safety-critical work should be assessed by an appropriately qualified professional.
How to use our figures
Use RepairCostPilot to prepare questions and a budget range. Then obtain written quotations that describe the same scope. If quotations differ significantly, compare inclusions and assumptions before comparing the total number.