How to calculate ARV.

After Repair Value — or ARV — is the estimated market value of a property after all planned renovations have been completed. It represents what the property will sell for once it's been brought to its highest and best use condition and listed on the open market.

ARV is the anchor of every calculation in a fix-and-flip deal. It determines your Maximum Allowable Offer (MAO) through the 70% rule, it sets the ceiling for your total investment (acquisition + renovation + holding costs), and it dictates your projected profit and ROI.

An ARV that's off by 10% on a $250,000 property means a $25,000 swing in your projected profit — often the difference between a strong return and a loss. This is why ARV accuracy is the most valuable skill a flipper can develop.

The formula looks simple, but the work is in the details: selecting the right comparables, adjusting for differences, and weighting them appropriately. Let's walk through each step.

Before you search for comps, you need to know exactly what the property will look like after renovations. This means specifying:

• Bedrooms and bathrooms — Are you adding a bathroom or converting a room? The post-renovation bed/bath count is what matters.
• Total square footage— Include any additions you're planning. If you're finishing a basement, note whether you're counting it as above-grade or below-grade SF.
• Condition and finish level — Will this be a budget flip with builder-grade finishes or a premium renovation with quartz countertops and hardwood floors? This dramatically affects comp selection.
• Lot size and features — Garage, pool, lot acreage, and outbuildings all affect value.

The more precisely you define the end state, the better your comps will be. Vague renovation plans lead to vague ARV estimates.

Comps are the foundation of ARV. You're looking for properties that match your subject property's post-renovation condition — not its current state. Here are the criteria for selecting strong comparables:

Recency: Sold within the last 90 days is ideal. Up to 180 days is acceptable in slower markets. Anything older is unreliable in the current environment. In a market moving 5% per quarter, a 6-month-old comp could be off by 2.5%.

Proximity: Within 0.5 miles is ideal; 1 mile is the maximum in most suburban markets. In dense urban areas, stay within 0.25 miles. In rural areas, you may need to expand to 3–5 miles. The key is that comps should be in the same school district, neighborhood, and general price band.

Size:Within 10–15% of the subject property's square footage. A 1,400 SF comp for a 2,000 SF subject property requires significant adjustment and reduces reliability.

Bed/bath count: Match as closely as possible. A 3/2 comp for a 4/3 subject is usable with adjustments but not ideal.

Condition: This is critical. You need comps that sold in similar renovatedcondition. A distressed sale is not a valid comp for a renovated ARV. Look for properties described as “updated,” “renovated,” or “move-in ready” in the MLS remarks.

Quantity: Pull a minimum of 3, ideally 5–6. More comps create a more reliable average and reveal outliers. If you can only find 1–2 true comps, your confidence in the ARV should be low and your offer price should reflect that uncertainty.

Our free ARV calculator walks you through this process interactively, and Vortonic's AI ARV modeling automates comp selection and adjustment across millions of transactions.

No comp is a perfect match. The adjustment step accounts for differences between each comparable sale and your subject property. This is where experience and local market knowledge matter most.

Square footage adjustment:Typically $30–$80 per square foot depending on market. If a comp is 1,600 SF and your subject is 1,800 SF, and the local price-per-SF differential is $50, add $10,000 (200 SF × $50) to the comp's sale price.

Bedroom/bathroom adjustment: An additional bedroom typically adds $5,000–$15,000 depending on market. An additional full bathroom adds $8,000–$20,000. A half bath adds roughly half that.

Garage adjustment: A 2-car garage vs. no garage represents a $10,000–$25,000 adjustment in most markets.

Condition adjustment:If a comp sold with original 1990s finishes while your subject will have full modern finishes, adjust upward $15,000–$30,000. If a comp had a premium kitchen while you're doing builder-grade, adjust down.

Lot size adjustment: In suburban markets, lot size adjustments are typically $1–$5 per additional SF of lot. In urban markets, lot premiums are higher.

Location adjustment: If a comp is on a busier road, backs to commercial property, or is in a slightly less desirable micro-location, adjust accordingly. This is the most subjective adjustment and requires local knowledge.

After adjusting each comp, calculate the average. But not all comps deserve equal weight. Prioritize:

• More recent sales over older ones
• Closer proximity over more distant
• Fewer adjustments needed over heavily adjusted comps
• Similar property type (ranch to ranch, colonial to colonial)

If your five adjusted comps come in at $242,000, $248,000, $238,000, $251,000, and $244,000, the simple average is $244,600. If the two closest and most recent comps are $248,000 and $244,000, you might weight your estimate toward $246,000.

In any market where conditions are uncertain — rising interest rates, increasing inventory, or declining buyer demand — apply a 3–5% discount to your ARV. This is not pessimism; it's risk management.

If your comp analysis yields a $246,000 ARV and the market is showing early signs of cooling, apply a 4% discount: $246,000 × 0.96 = $236,160. Round to $235,000 for your working ARV.

This discount protects you against market drift during your 4–6 month holding period. In a stable, rising market, you can skip this step. Check our market reports to understand current trend direction in your target market.

Let's walk through a complete ARV calculation with real numbers.

Subject property: 3-bedroom, 2-bathroom ranch, 1,450 SF, 0.18-acre lot, 1-car garage. Post-renovation plan: new kitchen with granite counters, updated bathrooms, refinished hardwood floors, fresh paint, new roof, updated HVAC.

Simple average: ($221,500 + $221,500 + $218,500 + $217,500 + $225,500) ÷ 5 = $220,900

Weighted estimate: Comps 1 and 2 are closest and most recent, both at $221,500. Weighting these more heavily gives a working ARV of approximately $221,000.

Indianapolis is a stable/rising market (see our 2026 rankings), so no confidence discount is needed.

Final ARV: $221,000. Using the 70% rule, with estimated $35,000 in repairs: MAO = ($221,000 × 0.70) − $35,000 = $119,700.

1. Using Zillow Zestimates as ARV. Zestimates reflect current condition with a 6–8% median error rate. They are not post-renovation estimates. A $250,000 Zestimate on a distressed property tells you nothing about what it will sell for after a $40,000 renovation.

2. Cherry-picking high comps.It's tempting to use only the highest-priced sales to inflate your ARV and make a deal look better on paper. This is how flips lose money. Use all valid comps, not just the ones that support the outcome you want.

3. Using stale comps. In a market moving 5% per quarter, a comp from 6 months ago is already 2.5% outdated. Always prioritize recent sales, and in fast-moving markets, weight comps from the last 30–60 days most heavily.

4. Ignoring condition differences. A renovated sale at $240,000 and a partially updated sale at $215,000 are not comparable without adjustment. The level of renovation — cosmetic refresh vs. full gut — must be accounted for.

5. Not adjusting for location nuances. Two properties 0.5 miles apart can be in entirely different micro-markets — one backing to a park, the other to a highway. Always view comp locations on a map and assess the immediate surroundings.

How many comps do I need?

Minimum 3, ideally 5–6. Fewer than 3 creates unreliable estimates. If you can't find 3 valid comps within your search criteria, widen the radius or time frame — but note the reduced confidence in your final number.

Can I use pending sales as comps?

Pending sales are useful as supporting data points but shouldn't be primary comps. The final sale price often differs from the pending contract price due to negotiations, appraisal adjustments, and concessions.

How do I calculate ARV if there are no good comps?

In markets with limited data, you have two options: expand your search radius and time frame (accepting lower confidence), or use a price-per-square-foot analysis from the broader area and apply it to your subject property. In either case, build in a larger margin of safety — use 65% instead of 70% in your MAO formula.

Should I get a professional appraisal?

For deals above $300,000 or in unfamiliar markets, a professional appraisal ($400–$600) is cheap insurance. However, appraisals also use comps — so the methodology is the same. The value of an appraiser is their local knowledge and experience with adjustments.

How does Vortonic calculate ARV?

Vortonic's AI-powered ARV engine analyzes dozens of comparable sales per property, applies automated adjustments based on property characteristics, condition scoring, and market trends, and produces an ARV estimate with a confidence interval. It's the same methodology described in this guide, executed at institutional scale with data from millions of transactions.