Methodology
How RemodelCostHub estimates are built.
Every calculator is a planning model, not a scraped contractor price or a disguised lead-generation quote.
1. Define the project
We separate intents that behave differently—such as basement finishing versus remodeling, or a walk-in shower installation versus a tub-to-shower conversion.
2. Check multiple current benchmarks
We compare dated public sources and note when their project definitions, samples, or source lineage differ. A single publisher average does not become our model by default.
Multiple URLs are not automatically multiple independent confirmations. When affiliated publishers or pages reproduce the same figures—for example, identical Angi and HomeAdvisor ranges—we treat that as shared context rather than double-counting it as separate evidence.
3. Build explicit assumptions
Base scope, finish level, broad market context, major options, soft costs, and contingency are modeled separately where appropriate. Each model has a version identifier.
4. Avoid false precision
Regional controls are intentionally broad. We do not claim ZIP-level contractor pricing without a construction-specific dataset that supports it.
What our ranges mean
Our low and high figures are fixed planning bands around a modeled midpoint. They are not statistical confidence intervals, measured prediction-error limits, or guaranteed minimum and maximum bids. Contingency is a separate allowance already included in the midpoint; do not add it again to the displayed total.
Public cost-guide comparisons check plausibility, not real-project predictive accuracy. We have not validated these models against a representative set of completed-project invoices or matched local contractor bids. Finish, market and scope multipliers are editorial planning assumptions. Actual costs can fall outside the displayed band.
5. Preserve limitations
Hidden damage, structural conditions, hazardous materials, local code, access, contractor overhead, design choices, and labor availability can materially change real bids.
A kitchen estimate, step by step
This example uses a 160 sq ft kitchen, standard scope, mid-range finish and near-national-average market setting. Optional layout work, island, appliance package and structural-wall allowances are off.
- Area allowance: 160 sq ft × $153 = $24,480. The minimum base is $10,000; it does not change this example.
- Standard scope, mid-range finish and national market each use a multiplier of 1. No option allowance is added.
- Contingency: $24,480 × 10% = $2,448. It is included in the $26,928 midpoint.
- Planning band: midpoint ± 20%, rounded to whole dollars: $21,542–$32,314.
Model 2026.09.29-k1. The band is not a confidence interval. Your contractor's scope, site conditions and selections can put a quote outside it.
Try this scenario in the kitchen calculator and save another version to compare choices.
Reading the sources
A survey median describes the middle respondent; a published average summarizes a particular project mix. Neither is automatically the price of your project. The guide tables identify the source and scope so you can compare similar work. Inline links lead to the cited publisher, while the source list records our last research check.
What a local adjustment can tell you
Our market settings are broad editorial assumptions. Employee wages, materials, subcontractor availability, overhead, permits and site conditions all affect a bid. We do not convert a general regional price index into a construction quote. A state-level model would need construction-specific evidence and a clear separation of labor and other costs before it could replace these settings.
Compare this with your proposals
Ask each contractor to identify the same scope, quantities, material allowances, demolition, disposal, permit responsibilities and exclusions. Compare the written line items before comparing totals. Keep your chosen contingency separate from the contractor’s contract amount; the calculator already includes its stated contingency in the displayed estimate.
Updates
We refresh source checks and model assumptions when credible new benchmarks materially change the planning context. Updated dates and sources are visible on individual guides. Prices are not connected to a live contractor-price feed. Source checks do not automatically change calculator rates; model changes require evidence and validation. Previously saved estimates retain their original price range and model version.