Rehab Cost Estimate Calculator

Background.

Use Rehab Cost Estimate Calculator when you need to sum trade budgets and apply an explicit contingency to the scoped work. A rehab estimate is a bottom-up scope budget; contingency covers uncertainty but should not hide known omitted work. Here the arithmetic follows “rehab estimate = entered interior, exterior, systems, permit, holding and other costs x (1 + contingency),” rather than silently mixing alternatives.

The editable entries are interior rehab work, exterior and roof work, mechanical, electrical and plumbing work, permits, holding and other entered rehab costs, rehab contingency allowance. Use values from the document or measurement that governs this rehab cost estimate question; the defaults are only the worked fixture below. The most consequential input mistake would be to ignore that labor and material prices are local and dated, and structural, hazardous-material and permit surprises need inspection.

Fannie Mae Selling Guide B3-3.1-08, Rental Income; documented gross and net rental-income treatment documents the convention or governing rule used here. The rehab cost estimate output is a transparent scenario under those facts: it does not manufacture an unentered market price, professional determination, carrier quote, legal eligibility finding or locally adopted code value.

What is rehab cost estimate calculator?

Rehab Cost Estimate is the relationship behind this decision: a rehab estimate is a bottom-up scope budget; contingency covers uncertainty but should not hide known omitted work. On this page it means rehab estimate = entered interior, exterior, systems, permit, holding and other costs x (1 + contingency). Labor and material prices are local and dated, and structural, hazardous-material and permit surprises need inspection; that is the line between the reported quantity and a broader real estate analysis.

How to use this calculator.

1. 01Confirm that “rehab estimate = entered interior, exterior, systems, permit, holding and other costs x (1 + contingency)” matches the rehab cost estimate convention you need.
2. 02Replace the fixture values for interior rehab work, exterior and roof work, mechanical, electrical and plumbing work, permits, holding and other entered rehab costs, rehab contingency allowance with dated values from the governing record.
3. 03Keep all currencies, measurement units and time periods on the same basis before calculating.
4. 04Read estimated total rehab cost together with this boundary: Labor and material prices are local and dated, and structural, hazardous-material and permit surprises need inspection.

The formula.

The calculation uses rehab estimate = entered interior, exterior, systems, permit, holding and other costs x (1 + contingency). In this rehab cost estimate model, the entered terms are interior rehab work, exterior and roof work, mechanical, electrical and plumbing work, permits, holding and other entered rehab costs, rehab contingency allowance. A rehab estimate is a bottom-up scope budget; contingency covers uncertainty but should not hide known omitted work, which is why the relationship is presented under this name rather than as a universal alternative. Labor and material prices are local and dated, and structural, hazardous-material and permit surprises need inspection. Calculations keep full decimal precision through the relationship and round only the returned display values.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Fannie Mae Selling Guide B3-3.1-08, Rental Income; documented gross and net rental-income treatment. Retrieved 2026-08-07. access: open unless marked otherwise.
2. [2]Freddie Mac, Modeling Multifamily Potential Rental Income; current rent roll, concessions and vacancy treatment. Retrieved 2026-08-07. access: open unless marked otherwise.
3. [3]National Association of Realtors. Research and statistics. Retrieved 2026-08-07. independence: secondary-check; access: open.