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Real Estate InvestorGenerated accuracy model review: 2026-05-06

Rehab Budget Calculator accuracy and testing

This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.

Formula source

  • Base repair cost = labor + materials + mechanical + exterior + interior. Contingency amount = base repair cost x contingency percent / 100. Soft costs = permits + holding + other. Total rehab budget = base repair cost + contingency amount + soft costs.

Test cases

Default input regression check

Generated from the checked-in default inputs and calculate function.

Inputs

  • Labor Cost: $18,000
  • Materials Cost: $12,000
  • Mechanical Systems: $8,000
  • Exterior Repairs: $2,500
  • Interior Finishes: $1,500
  • Contingency: 12%
  • Permits and Fees: $2,500
  • Project Holding Costs: $4,000
  • Other Costs: $1,500

Expected outputs

  • Total Rehab Budget: $55,040.00
  • Base Repair Cost: $42,000.00
  • Contingency Amount: $5,040.00
  • Permits, Holding, and Other: $8,000.00

Known limitations

  • This calculator is a planning model only. It does not predict appreciation, market liquidity, lender approval, tax treatment, insurance availability, permit risk, legal obligations, construction defects, tenant behavior, or final sale price.

Assumptions

  • All costs, rents, ARV, loans, reserves, fees, and rates are user-entered assumptions.
  • Calculations are deterministic and do not fetch market rents, tax rules, insurance quotes, lender terms, or property records.
  • Results are estimates only and are not financial, tax, legal, lending, appraisal, inspection, or investment advice.

Unit handling

  • Labor Cost accepts values in $.
  • Materials Cost accepts values in $.
  • Mechanical Systems accepts values in $.
  • Exterior Repairs accepts values in $.
  • Interior Finishes accepts values in $.
  • Contingency accepts values in %.
  • Permits and Fees accepts values in $.
  • Project Holding Costs accepts values in $.
  • Other Costs accepts values in $.
  • Total Rehab Budget is displayed as currency.
  • Base Repair Cost is displayed as currency.
  • Contingency Amount is displayed as currency.
  • Permits, Holding, and Other is displayed as currency.

Rounding rules

  • Number displays use up to 2 decimal places in the calculator UI.
  • Currency outputs are displayed with standard US dollar formatting.
  • Input precision follows configured step values where provided.

Version history

1.0.0 - 2026-05-06

Generated accuracy and testing page from the current rehab-budget-calculator calculator definition.

Change log

2026-05-06

Published default regression test documentation and metadata fallbacks for Rehab Budget Calculator.

Calculator transparency

Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.

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