The REI Vault Pro ARV Calculator: How to Accurately Estimate After Repair Value Using Comparable Sales

In fix-and-flip investing, BRRRR investing, and wholesaling, one number drives every other calculation: After Repair Value. Your MAO is a function of ARV. Your refinance loan amount is a function of ARV. Your profit projection is the difference between ARV and your all-in cost. If your ARV is wrong — especially if it is optimistically high — every downstream number in your deal model is wrong with it.

Getting ARV right is the most important analytical skill in active real estate investing. The REI Vault Pro ARV Calculator gives you a structured, comp-based framework for building a defensible estimate on every deal.

What ARV Is and Why It Is So Frequently Wrong

After Repair Value is the market value a property will command once it has been renovated to retail-ready condition. It is not the current as-is value. It is not the value the seller believes the property is worth. It is what a comparable property in fully renovated condition would sell for in the current market, based on actual comparable sales.

ARV is frequently overestimated for predictable reasons. Investors want the deal to work, so they stretch toward the highest comparable sale. They use comps that are not truly comparable — different bed/bath count, significantly larger or smaller, substantially better location. They use old comps in a market that has softened. They forget that renovated properties sell at a premium only if the renovation is genuinely retail-ready, not just livable.

An inflated ARV leads to an inflated MAO, which leads to a deal where the profit exists only on paper — and disappears when the actual sale price comes in $20,000–$30,000 below projection.

The Comparable Sales Approach

The only defensible method for estimating ARV is the comparable sales approach: identify recently sold properties that are genuinely comparable to the subject property in its post-renovation condition, and use those sale prices to establish a value range.

The ARV Calculator accepts up to five comparable sales and applies net adjustments to arrive at a comp-adjusted ARV estimate.

What Makes a Valid Comp

Proximity — within 0.5 miles for urban and suburban properties. In rural areas or very low-density markets, you may need to extend to 1 mile, but closer is always better. Recency — sold within the last 6 months. In fast-moving markets, use 3 months. In slower markets or thin inventory, 9 months may be acceptable with a softening adjustment. Condition — sold in fully renovated, retail-ready condition. Do not use as-is sales or distressed comparables as ARV anchors — they reflect as-is value, not repaired value. Similarity — same bed and bath count. Similar square footage (within 15–20%). Similar lot size if relevant in the market. Similar garage and basement configuration if those features affect value in the area.

What Net Adjustments Account For

No two properties are identical, so direct sale price comparisons are imprecise. Net adjustments account for the measurable differences between comps and the subject property.

Positive adjustments (add to the comp's sale price to estimate subject value): the subject has a larger garage, an additional bathroom, a more desirable location within the submarket, a larger lot. Negative adjustments (subtract from the comp's sale price): the subject is smaller, on a busier street, has only one bathroom where comps have two, is in a slightly inferior school district.

Net adjustments require market knowledge to apply accurately. Agents, appraisers, and experienced local investors can help calibrate adjustment values for your specific market.

What the ARV Calculator Returns

Estimated ARV

The average of your entered comps plus net adjustments. This is your working ARV — the number you plug into your MAO calculation, your flip P&L, and your BRRRR refinance projection.

Comp Range Analysis

The calculator returns the lowest comp, the highest comp, and the total range. The range is quality-rated: a range below 10% of the average is excellent (tight, reliable comps). A range of 10–20% is acceptable but warrants scrutiny of the outliers. A range above 20% signals that the comps are not truly comparable — some should be removed or the methodology should be revisited.

Number of Comps

The calculator rates the reliability of your comp set by count: five or more comps is excellent. Three to four is acceptable. Fewer than three is weak — the analysis is vulnerable to any single comp being anomalous.

If you cannot find three quality comps that meet the criteria above, the ARV is unreliable and the deal carries additional risk. Either expand your search criteria cautiously and apply a discount, or acknowledge that the value is uncertain and price that uncertainty into your offer.

The Two Most Common ARV Mistakes

Using the Highest Comp as the Target

The highest comparable sale in your set is not your ARV. It is the ceiling of the range — the best-case scenario under ideal conditions. Your ARV should be the average of a quality comp set, with adjustments for differences. Using the ceiling as the target is optimism masquerading as analysis.

Professional appraisers use a weighted average of adjusted comps with no single comp dominating the conclusion. Mimic that discipline in your own ARV work.

Ignoring Market Direction

A comp that sold 8 months ago in a declining market overstates today's value. A comp that sold 3 months ago in a rapidly appreciating market may understate it. Use the most recent comps available and apply a directional adjustment if the market has moved materially in the time between the comp sale and your projected sale date.

ARV in the Context of Your Full Deal Model

ARV feeds directly into every other calculation in your deal model. Once you have a defensible ARV from the calculator, use it as your input in:

MAO Calculator — to determine your maximum allowable offer. Fix and Flip Calculator — as the Expected Sale Price input. BRRRR Calculator — as the After Repair Value for refinance projection. Wholesale Calculator — as the ARV input for end buyer offer pricing.

A well-established ARV is the foundation of every credible deal model. Build it carefully, build it conservatively, and build it before you make any offer.

Open the ARV Calculator and run the comps on a property you are currently evaluating. Available to Core and Pro members. Start your 7-day free trial today.