Fidamen

After Repair Value (ARV) Calculator

This ARV estimator helps you approximate a property's market value after repairs (After-Repair Value). It provides multiple approaches: price-per-square-foot, average comparable sale, adjusted ARV (percent and repairs), and the 70% investor rule to derive a conservative maximum purchase price.

This tool is intended for preliminary analysis and deal screening. It is not a certified appraisal. Use a licensed appraiser or local valuation expert for lending, legal, or formal valuation needs.

Updated Nov 23, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 8da25e78aacb • Reviewed by Fidamen Standards Committee

Estimate ARV by applying an average price-per-square-foot (from comparable sales or market data) to the subject property area.

Inputs

Results

Updates as you type

Estimated After-Repair Value (ARV)

$225,000.00

OutputValueUnit
Estimated After-Repair Value (ARV)$225,000.00USD
Primary result$225,000.00

Visualization

Methodology

Price-per-square-foot method: multiply an average market price per square foot (derived from sales of similar properties) by the subject property's finished area. This is commonly used when comparable sales are consistent in size and condition.

Average comparable sale method: derive a per-square-foot rate from the average sale price and size of comparable properties, then apply that rate to the subject property.

Adjusted ARV: apply a percentage adjustment to the base ARV to reflect market movement, neighborhood trends, or differences in quality; add quantified repair value when repairs directly increase market value.

70% rule (investor heuristic): calculates a conservative maximum purchase price based on ARV to allow room for repairs, holding costs, and desired profit. This is a rule-of-thumb and not a substitute for detailed financial underwriting or appraisal.

Worked examples

Example 1 — Price-per-sqft: If the market avg is $160/sqft and the subject is 1,500 sqft, ARV = $160 × 1,500 = $240,000.

Example 2 — 70% rule: With ARV $240,000, repairs $15,000, and purchase costs $5,000, max purchase = (240,000 × 0.7) − 15,000 − 5,000 = $148,000.

F.A.Q.

Is this estimator a formal appraisal?

No. This is a modeling tool for preliminary valuation and deal screening. It does not replace a licensed appraisal or a market analysis performed by professional appraisers.

How accurate are the results?

Accuracy depends on input quality: representativeness of comparable sales, correct size measurements, and realistic repair estimates. Use local recent comps and, when available, adjust for material differences. Expected uncertainty varies by market; always include a sensitivity margin.

Which method should I use?

Use the price-per-sqft method when comps are consistent. Use the average-comp method when you have average comp prices and sizes. Use the adjusted method to include verified repair value or documented market adjustments. Use the 70% rule only for quick investor screening, not formal valuation.

Are there recommended data or quality practices?

Yes. Prefer recent (typically last 3–6 months) comparable sales, control for key factors (size, condition, lot, location), and document assumptions. For compliance and traceable measurement practices, follow relevant measurement and quality standards.

Should I rely on this for lending or legal matters?

No. Lenders and courts typically require a licensed appraisal prepared under recognized appraisal standards. Use this tool for internal analysis only.

Sources & citations

Further resources

External guidance

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: 8da25e78aacb

What changed (latest)

v1.0.0 • 2025-11-23 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 23, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-23 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 9db1ff8caa4d