How to Calculate Percentage Increase in Property Value After Repairs

To calculate percentage increase in property value after repairs, you compare two numbers: the as-is value (what the property is worth today, before any work is done) and the after-repair value, or ARV (the price a fully renovated, comparable home would sell for). Subtract the as-is value from the ARV, divide that difference by the as-is value, then multiply by 100. For wholesalers and flippers, getting this percentage right, quickly, often decides whether a deal closes or walks to a faster competitor. Below, we break down the formula, work through a real example, and show where investors commonly get the math wrong.

How to Calculate Percentage Increase in Property Value After Repairs

The percentage increase in property value after repairs compares what a property is worth today against what it will be worth once renovations are complete, known as the After Repair Value, or ARV. Specifically, the formula looks like this:

For example, if a property is worth $220,000 as-is and the ARV comes back at $300,000, the math is ($300,000 − $220,000) ÷ $220,000 × 100, which equals roughly 36%. In other words, the planned repairs are expected to grow the home's value by about a third. However, this percentage is only as reliable as the two inputs feeding it, so pulling accurate comparable sales (comps) matters more than the formula itself.

What Is a Good Percentage Increase After Repairs?

There's no universal "good" percentage, because it depends on purchase price, repair cost, and exit strategy. That said, most experienced flippers look for an ARV that's at least 30-40% higher than the purchase price, since that spread usually leaves room for repairs, holding costs, and profit. In contrast, a buy-and-hold investor might accept a smaller percentage increase if the property cash flows well, since their return comes from rent and appreciation rather than a quick resale. If you're unsure how carrying costs eat into that margin, this guide on calculating holding costs on a flip breaks it down further.

The ARV Formula Behind Property Value Growth From Renovations

Before you can calculate percentage increase in property value after repairs, you need two trustworthy baseline numbers. As a result, understanding how investors actually build an ARV matters just as much as the percentage formula itself.

ARV typically comes from a comparative market analysis, a method similar to formal real estate appraisal, where recently sold, renovated homes near the subject property become the benchmark. Specifically, investors look for comps that are:

• Nearby, usually within a half-mile to one mile
• Recently sold, ideally within the last 90 days
• Similar in square footage, bedroom and bathroom count, and lot size
• Comparable in condition once repairs are complete

Furthermore, each comp gets adjusted up or down based on differences from the subject property. For instance, if a comp has an extra bathroom, its sale price is adjusted downward before being averaged with the others. In addition, the as-is value follows the same logic, except the comps used are homes sold in similar, unrenovated condition. Consequently, small errors in comp selection compound into large errors in your percentage increase; pulling the wrong comp by even $15,000 can shift a 36% increase into a 28% or 44% increase. For a deeper walkthrough of building this number from scratch, see this step-by-step ARV calculation guide.

Step-by-Step Process to Find Your Value Increase Percentage

Above all, this process works the same whether you're sizing up a wholesale assignment or a long-term BRRRR deal (buy, rehab, rent, refinance, repeat). Follow these five steps in order:

1. Pull your as-is value. Gather three to six recent comparable sales of homes in similar, unrenovated condition near the subject property, then average their adjusted sale prices to estimate what the house is worth today, before repairs begin.
2. Estimate repair costs. Walk the property or review photos to scope needed work, then price out materials and labor by category, such as roof, kitchen, bathrooms, and mechanicals, so you know the true renovation cost before committing to a number.
3. Calculate the ARV. Pull three to six comps of recently sold, fully renovated homes nearby, adjust each for differences in size and features, then average them to land on a realistic after-repair value for the finished property.
4. Apply the percentage formula. Subtract the as-is value from the ARV, divide that difference by the as-is value, then multiply by 100 to get your percentage increase in property value after repairs.
5. Stress-test the number. Swap in a lower ARV comp or a higher repair estimate and recalculate, because a percentage that only looks good under best-case assumptions won't hold up once a seller or contractor renegotiates mid-deal.

Common Mistakes That Skew Your Repair ROI Numbers

Even when the formula is simple, in practice many investors calculate this figure incorrectly and don't realize it until after closing. In particular, four mistakes show up again and again.

First, using stale comps. A comp that sold eight months ago in a shifting market can overstate or understate the current ARV significantly. Similarly, pulling comps from too far away distorts the number, since even a half-mile makes a bigger difference in dense neighborhoods than in rural ones.

Second, underestimating repair costs. A $40,000 scope that turns into a $65,000 gut rehab doesn't just eat profit; it also means the as-is value you started with no longer applies cleanly. Tools that estimate repair costs automatically help close this gap before you make an offer, rather than after.

Third, ignoring condition adjustments. Comparing an unrenovated as-is comp against a fully staged ARV comp without adjusting for condition inflates the percentage on paper, which can push an offer too high or too thin. Fourth, rounding too early. Rounding the as-is value or ARV before running the percentage formula can shift the final number by several points — enough to matter when you're justifying an offer to a partner or lender.

"I'm on it every day… I can give sellers an offer on the same call."

ARV vs. As-Is Value: Why Your Baseline Changes the Percentage

The same property can show very different percentage increases depending on how deep the renovation goes. The table below illustrates this with example scopes on a similar starting property:

Figures above are illustrative examples. For real-world renovation ROI data, the 2024 Cost vs. Value Report from Remodeling magazine found a minor kitchen remodel recoups close to 96% of its cost at resale nationally, while a major kitchen remodel recoups roughly 50%. In other words, the type of repair you choose changes your percentage increase just as much as the comps you pull.

How ChatARV Speeds Up the Entire Comp and ARV Process

Calculating this percentage by hand is straightforward once you have reliable numbers, but gathering those numbers is where most of the 20 to 30 minutes gets spent. Specifically, ChatARV was built to close that gap for wholesalers and investors who need a defensible offer before the seller finishes their coffee.

After you enter a property address, ChatARV reviews hundreds of nearby properties, surfaces the six strongest comps, and automatically adjusts for square footage, bedroom and bathroom count, lot size, and condition. As a result, both the as-is value and the ARV come back in about 60 seconds, along with an automated repair-cost estimate and a ready-to-use offer for wholesale, novation, fix-and-flip, buy-and-hold, and BRRRR exits.

Because the report shows every comp and every adjustment, investors can see exactly why the percentage increase landed where it did, rather than trusting a black-box number. In addition, deals change after a walkthrough; when repair scope shifts, you can update the estimate and ChatARV recalculates the as-is value, ARV, and percentage increase instantly — which is exactly what let one user renegotiate a gut-rehab deal into a $35,000 assignment fee. ChatARV also supports comping in all 12 non-disclosure states, where sale prices aren't public record, so investors without their own MLS access can still calculate percentage increase in property value after repairs with confidence. For a closer look at the as-is side of this calculation, see this guide to as-is value calculations.

Frequently Asked Questions

What does percentage increase in property value after repairs mean?

It's the percentage gain between what a property is worth today, as-is, and what it's projected to be worth after renovations, known as the After Repair Value or ARV. Investors use this number to judge whether a renovation is worth the cost and time.

How do I calculate percentage increase in property value after repairs?

To calculate percentage increase in property value after repairs, subtract the as-is value from the ARV, divide that result by the as-is value, then multiply by 100. For example, an as-is value of $220,000 and an ARV of $300,000 produces an increase of about 36%.

What formula do investors use to calculate ARV percentage gain?

The formula is ((ARV − As-Is Value) ÷ As-Is Value) × 100. It's the same percentage-change formula used across finance, applied to a property's before-and-after value.

Is percentage increase or dollar increase more useful for evaluating a flip?

Both matter, but for different reasons. The dollar increase shows raw profit potential, while the percentage increase shows how efficiently your repair dollars are working, which is useful for comparing two very different deals side by side.

How much do repairs typically cost on a fix-and-flip?

Repair costs vary widely by scope, region, and property age, ranging from a few thousand dollars for cosmetic work to well over $80,000 for a full gut renovation. Because financing a renovation adds its own risk, the Consumer Financial Protection Bureau outlines general considerations for budgeting home improvement costs responsibly.

How long does it take to calculate an accurate ARV?

Manually, pulling and adjusting comps usually takes 20 to 30 minutes per property. AI-based tools can return a comp set, ARV, and as-is value in about 60 seconds, which is why many wholesalers now give sellers an offer during the first call.

What's the biggest mistake investors make when estimating value increase?

The most common mistake is pulling stale or mismatched comps, then running the percentage formula on numbers that don't reflect the current market. Even a small comp error can shift the percentage increase by several points.

What's considered a good percentage increase after repairs?

There's no fixed number, but many flippers target an ARV that's at least 30-40% above the purchase price to leave room for repair costs, holding costs, and profit. Buy-and-hold investors may accept smaller percentage increases if cash flow is strong.

Can I calculate percentage increase in property value in non-disclosure states?

Yes, though it's harder because sale prices aren't public record in the 12 U.S. non-disclosure states. Investors typically need MLS-sourced data or a comping tool with broad data-provider access to pull reliable comps there.

Can software calculate this percentage for me automatically?

Yes. AI-based deal-analysis tools can pull comps, calculate ARV and as-is value, estimate repair costs, and apply the percentage formula automatically within about a minute. This overview of AI-driven repair cost estimation shows how those estimates feed directly into the final percentage.

Does the percentage increase change depending on exit strategy?

The formula itself doesn't change, but the inputs often do. A wholesale deal may use a conservative ARV with a larger buffer, while a BRRRR investor might calculate the increase against a refinance appraisal rather than a quick-sale ARV.

How many comps should I use to calculate ARV accurately?

Most investors use between three and six comps for both the as-is value and the ARV. Using fewer than three risks an unreliable average, while too many unadjusted comps can dilute accuracy if they aren't truly comparable.

Can repairs decrease a property's percentage value instead of increasing it?

Yes, if repair costs exceed the value they add, or if the work doesn't match what buyers in that neighborhood expect. Over-improving a home beyond the standard for its area is a common way investors lose money on renovations.

Should I round my percentage increase calculation?

Avoid rounding the as-is value or ARV before running the formula, since early rounding can shift the final percentage by several points. It's fine to round the final result to the nearest whole percent once the calculation is complete.

How do I verify my percentage increase number before making an offer?

Stress-test the calculation by swapping in a slightly lower ARV comp or a slightly higher repair estimate, then recalculate. If the percentage increase still supports a profitable offer under those tougher assumptions, the number is more likely to hold up after the walkthrough.

Ultimately, learning to calculate percentage increase in property value after repairs comes down to trusting two numbers: an accurate as-is value and a well-supported ARV. Once those are solid, the formula itself takes seconds. However, getting those inputs right by hand can still eat 20 to 30 minutes per property, which is exactly the bottleneck tools like ChatARV were built to remove. Whether you're assembling a wholesale offer, scoping a fix-and-flip, or running BRRRR numbers, a defensible percentage increase, backed by real comps and a realistic repair budget, is what lets you make a confident offer before the competition picks up the phone.