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How to Calculate ARV Like a Pro (And Why It Matters for Flipping)
By The FlipVerdict Team · June 10, 2026 · 9 min read
Every flipping decision — what to offer, how much to spend on rehab, whether to walk away — starts with one number: After Repair Value (ARV). Get the ARV wrong and the whole deal dies on the closing table. Here's the appraiser-grade method real investors actually use.
What is ARV (After Repair Value)?
ARV is the price your renovated house will sell for, on the open market, the day you list it. It's not the Zillow Zestimate. It's not what the seller paid in 2019. It's the answer to one question: What will a willing buyer pay for this house, in this neighborhood, after I finish the rehab?
Banks and hard money lenders make every decision against ARV. The classic 70% rule — your maximum allowable offer = (ARV × 0.70) − rehab cost — only works if your ARV is honest. Inflate it by 10% and you'll lose money on the flip even if everything else goes right.
The 6-step ARV calculation, the way appraisers do it
Step 1 — Define the subject property's "as-repaired" condition
Before you can compare your house to anything, you have to decide what it will be when you're done. Cosmetic flip (paint, floors, fixtures, kitchen, bath)? Full gut rehab with permitted additions? A 1,400-sqft 3-bed with original kitchen will appraise very differently from the same shell with a permitted 200-sqft primary suite addition. Write down the finished bedroom/bath count, total finished square footage, and the quality tier you're targeting (builder-grade, mid-grade, designer).
Step 2 — Pull recent comparable sales (not active listings)
You want closed sales within the last 90 days, ideally within 0.5 miles, of similar size, age, beds/baths, and finish level. Active listings are the seller's wishlist; closed sales are the truth. If your area is slow, you can stretch to 6 months and 1 mile, but every step away from "closed, recent, close, similar" widens your confidence interval.
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Step 3 — Filter ruthlessly
Throw out any comp that's:
- A foreclosure, short sale, REO, or auction (distressed = below market)
- Sold between related parties (look at sale price vs. assessor value)
- Across a school district boundary, freeway, or rail line
- More than ±25% off your subject's square footage
- A different property type (don't compare a single-family to a condo)
You're trying to get to 3 to 6 clean comps. Five is the sweet spot. Fewer than three and you don't have enough signal; more than six and you'll talk yourself into whatever ARV you want.
Step 4 — Apply the standard appraiser adjustments
Comps are never identical to your subject. Adjust each comp toward your subject's profile using the same factors a licensed appraiser uses:
| Feature | Typical adjustment | Direction |
|---|
| Living area (sqft) | $60–$150 per sqft difference | Add to comp if comp is smaller |
| Bedroom count | $3,000–$10,000 per bedroom | Add if comp has fewer bedrooms |
| Bathroom count | $5,000–$15,000 per bath | Add if comp has fewer baths |
| Garage spaces | $5,000 per space | Add if comp has none |
| Lot size | $2–$10 per extra sqft | Add if comp's lot is smaller |
| Condition / finish tier | 5%–15% of sale price | Add if comp is inferior condition |
| Days since sale | Local appreciation rate × months | Add to older comps in a rising market |
These ranges are calibrated for most US metros; high-cost markets (Bay Area, NYC, coastal LA) push the per-sqft numbers significantly higher.
Step 5 — Take the adjusted median, not the average
Once every comp is adjusted, you have a list of "what your subject would have sold for if it had been this comp." Take the median of the adjusted sale prices, not the arithmetic mean. One luxury outlier can pull a 5-comp average up 8% — exactly the kind of false confidence that kills flips.
Step 6 — Express ARV as a range, not a point estimate
A serious ARV looks like this: $612,000 (low $585,000 – high $639,000), medium confidence. The width of the range reflects how much your comps disagreed after adjustments. Underwrite to the low end. If the deal pencils at the low ARV, you have margin. If it only works at the high end, you're betting on the market.
The 5 mistakes that ruin almost every beginner's ARV
- Using active listings as comps. Listings show seller hope, not buyer behavior.
- Picking the highest 3 comps and calling it a day. Confirmation bias is the most expensive flaw in real estate.
- Ignoring time adjustments in a rising or falling market. A comp from 8 months ago in a +6%/yr market is undervaluing your ARV by ~4%.
- Comparing across an invisible boundary. School districts, HOA lines, flood zones, and arterial roads create silent price walls.
- Using the post-rehab Zestimate. Zillow estimates current value, not after-repair value, and bakes in assumptions about your current condition.
Where most flippers get the comps
Licensed agents pull live MLS data with appraiser-grade filters. Without MLS access you're stitching together Zillow, Redfin, Realtor.com, and the county assessor — workable but tedious, and most public sites hide recent off-market sales. The professional shortcut: a tool that pulls the same data feeds in seconds.
A worked example: 1248 Maple St., Phoenix AZ
Subject: 1,420 sqft, 3 bed / 2 bath, 1968, 6,200 sqft lot, post-rehab target = mid-grade finish.
Five closed sales in the last 90 days within 0.4 miles:
| Comp | Sold | Sqft | Bd/Ba | Sale Price | Adj. | Adjusted |
|---|
| A | 22 d ago | 1,380 | 3/2 | $432,000 | +$3,200 | $435,200 |
| B | 45 d ago | 1,510 | 3/2 | $455,000 | −$7,200 | $447,800 |
| C | 11 d ago | 1,440 | 4/2 | $461,000 | −$8,400 | $452,600 |
| D | 78 d ago | 1,395 | 3/2 | $425,000 | +$5,100 | $430,100 |
| E | 34 d ago | 1,460 | 3/2 | $448,000 | −$3,200 | $444,800 |
Adjusted median = $444,800. Range: $430,100 – $452,600. The honest ARV is ~$445K, low end $430K. If you underwrite at $430K, the 70% rule says max offer = ($430K × 0.70) − rehab. Anything tighter than that is speculation.
Why this matters more in 2026 than ever
Cap rates have compressed, rehab labor is up ~18% since 2023, and buyer pools are smaller than they were during the 2021 frenzy. The flippers winning right now aren't the ones bidding the most — they're the ones whose ARV is right to the dollar. Get the number wrong and the entire profit margin disappears into a single concession at closing.
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Frequently Asked Questions
What's the difference between ARV and market value?
Market value is what the property is worth as-is, today. ARV is what it will be worth after the planned renovation — different condition, often different finished square footage, sometimes different bed/bath count.
How many comps do I need to calculate ARV?
Three to six closed sales, ideally within the last 90 days and 0.5 miles. Five is the professional standard. Fewer than three means low confidence; more than six and you'll cherry-pick.
Can I use Zillow's Zestimate as ARV?
No. Zestimate estimates current as-is value using a generalized model. It doesn't account for your renovation scope and is often 5–20% off in either direction for non-cookie-cutter homes.
Why use the median instead of the average?
One luxury outlier can pull the average up several percent. The median is more robust to a single weird comp and reflects what a typical buyer would actually pay.
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