Editorial methodology
HomeProjects.money provides early planning ranges. The calculator is transparent about what changes a result, where the location adjustment comes from and what must still be confirmed with local professionals.
HomeProjects.money editorial team reviewed this methodology on 18 August 2026. HomeProjects.money is an independent planning tool, not a contractor, surveyor or building-control body. Listed sources inform the context and checking process; calculator ranges remain editorial planning assumptions that must be tested against written local quotes.
The calculation
Each project has separate UK and US baseline low and high rates expressed in the unit shown by the calculator. The selected quantity is multiplied by that baseline, then by the chosen quality, complexity and state or UK-region factor. Optional removal and permit allowances are added before contingency. The low and high sides are calculated separately, so the result remains a range rather than a single promise.
Country selection determines the entire pricing context. UK results use GBP, metric units and UK baselines. US results use USD, US customary units where appropriate and US baselines. The site does not translate one country's amount with an exchange rate.
Baselines are editorial planning assumptions assembled for common residential work. They are deliberately broad and are not claimed to be a live contractor-price database, a quotation service or a government index.
UK regions and US states have broad planning multipliers reflecting relative labour conditions, logistics, demand and regulatory complexity. The selected city is a label for the intended market; no separate city multiplier is applied.
Quantity, finish, complexity, removal, permit allowance and contingency change the result. These controls cannot discover hidden defects, exact product specifications, taxes, incentives or contractor availability.
Source policy
Official sources are used to check terminology, regulatory context, labour-market direction and changes that could make guidance misleading. They do not directly generate the displayed contractor range. Project pages list the sources most relevant to that work and explain how each source was used.
Limitations
A remote calculator cannot inspect access, foundations, moisture, structure, utilities, hazardous materials, planning constraints, building-code triggers or the condition behind a finished surface. It also cannot know a contractor's workload, minimum charge, tax treatment, delivery cost or warranty terms. Treat the result as a budget interval, define the written scope and obtain at least three local quotations.
Allowances for permits and design are percentage-based planning amounts, not published local fees. Incentives and tax credits are excluded because eligibility changes by jurisdiction, property and date. Confirm them with the administering authority before relying on them.
Maintenance
Core pages are reviewed when calculator assumptions, country coverage or material guidance changes. The visible review date records the latest substantive editorial check. Corrections can be submitted through the contact page; reports should identify the page, disputed statement and an authoritative source. Advertising relationships do not alter calculator values or editorial conclusions.
Who, how and why
HomeProjects.money is published by OwnAI as an independent consumer planning resource. Calculation models and guides are developed using verified national benchmarks (including the UK Office for National Statistics and the U.S. Bureau of Labor Statistics) and official statutory building codes. Advanced computational models support data aggregation and consistency verification, with every published model reviewed by our editors for country separation, arithmetic rigor, and practical planning accuracy. All content is designed to assist homeowners in evaluating written contractor quotations.
The purpose is to help homeowners define scope and compare written bids. Pages are not created as city-by-city search variants: state and city selection supplies calculator context without publishing mass-produced location pages.