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Investors: Build a Lender Approved ARV With 3–5 Comps and the 70% Rule

October 3, 2026
Investors: Build a Lender Approved ARV With 3–5 Comps and the 70% Rule

ARV (after repair value) is the estimated market price of a property after planned renovations are complete, and it is the single figure your rehab budget, maximum offer, and lender underwriting will hinge on.

TL;DR:

  • A reliable ARV is based on recent closed sales of comparable homes in renovated condition, adjusted for size, location, and time.
  • The 70% rule is a rough screening tool that caps offers at 70% of ARV minus estimated rehab costs, but it is not a precise valuation method.
  • Lenders typically validate ARV through detailed appraisals that adhere to sales-comparison approaches, requiring real comparables and documented adjustments.
  • Over-relying on asking prices or automated estimates instead of actual closed sales increases the risk of significant valuation errors.
  • Accurate ARV calculations must be kept distinct from market value and rehab costs, as confusing these can lead to overestimating profit margins.
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Table of Contents

ARV vs. As-Is Value: Getting the Terms Right

ARV refers to what a property will sell for once the renovation work is finished, matching the condition of comparable homes that have already sold in updated shape. As-is value, by contrast, reflects the property's current, unrenovated condition, which is why the gap between the two numbers matters so much to your deal math.

That gap is often called the "value of repairs," but it should never be confused with your actual rehab budget. The value added by a renovation and the cost of performing it are two separate calculations, and conflating them is a common way investors miscalculate their margin.

Many investors use a shorthand known as the 70% rule, capping their offer at 70% of ARV minus repair costs, but this is a screening tool rather than a precise valuation method, according to SmartAsset's explainer on ARV.

  • ARV is the projected post-renovation sale price, not the current condition value.
  • As-is value is what the property would fetch today, before any work is done.
  • The value of repairs (the lift in price) is not the same as the dollar cost of repairs.
  • The 70% rule is a quick filter, not a substitute for a full ARV calculation.

How to Calculate ARV Using the Comps Method

A defensible ARV starts with real, closed sales data, not guesswork. The sales-comparison approach, the same method appraisers use, pulls recently sold homes that resemble your property's planned after-rehab condition and adjusts their prices to account for differences.

  1. Pull three to five closed comparable sales from the last three to six months, prioritizing homes near the subject property that sold in renovated or move-in-ready condition, a practice recommended in the BiggerPockets glossary on after-repair value.
  2. Adjust each comp for square footage, bedroom and bathroom count, lot size, condition at sale, and any amenities like a pool or garage.
  3. Account for time and market trends if a comp closed several months ago, since prices can shift between the sale date and your target closing.
  4. Calculate price per square foot for each adjusted comp, then average those figures and multiply by your subject property's square footage, or average the adjusted sale prices directly when the comps are similarly sized.
  5. Cross-check your number against county records and MLS sold data to confirm accuracy before presenting it to a lender.

Price-per-square-foot averaging tends to work better when comps vary in size, while direct adjusted prices work well when homes are nearly identical in layout. When comps are scarce in your immediate area, Fannie Mae's appraisal guidance supports expanding the search radius, provided you document why each comp was chosen and how every adjustment was derived.

Pro Tip: Pull your comps from county recorder data or an agent-accessed MLS rather than public listing sites, since closed-sale prices tell you what buyers actually paid.

A Worked Example: From Comps to Maximum Offer

Here is how the math plays out on a typical deal.

  1. Three renovated comps near your subject property sold at amounts typical for similar properties, each roughly the same square footage after minor adjustments for lot size and finishes.
  2. Average those adjusted prices to estimate an ARV.
  3. Applying the 70% rule to that ARV, then subtracting estimated rehab costs, gives a maximum offer guideline.
  4. A lender capping the loan at around 75% of ARV would lend accordingly, but your actual borrowing need depends on purchase price plus rehab, minus your down payment or private capital.
  5. Build in carrying costs (loan interest, insurance, utilities during the rehab period) and a profit buffer before finalizing your offer, since thin margins leave no room for surprises.

These figures are illustrative only. Real deals demand more conservative comp adjustments when the market is cooling, and tighter rehab estimates once contractor bids are in hand rather than guessed.

Avoiding the ARV Mistakes That Sink a Flip

The most common ARV error is leaning on asking prices or automated home-value estimators instead of closed sales. Appraisers rely on completed transactions because that is the only evidence of what a buyer actually paid, a standard reinforced in Fannie Mae's sales-comparison guidance.

Weak comps are another frequent trap: a home on a busier street, in a less desirable school zone, or sold six months ago without a time adjustment will skew your number in the wrong direction. Over-improving is just as risky. Installing finishes above what the neighborhood supports rarely returns your investment, since buyers in that price band simply will not pay for it.

  • Avoid relying on for-sale listings or automated estimates like Zestimate as stand-ins for closed comps.
  • Skip comps on a different street type, school zone, or with stale sale dates that lack time adjustments.
  • Watch for over-improvement: upgrades the surrounding market will not support rarely pay off.
  • Confirm every comp against closed-sale records, gather real contractor bids, and build in carrying costs before finalizing your number.

Pro Tip: If two of your comps disagree by more than 10% per square foot after adjustments, pull a fourth or fifth comp before trusting the average.

How Lenders and Appraisers Validate an Investor's ARV

Lenders rarely accept an investor's ARV estimate at face value. They typically order an appraisal that follows the same sales-comparison framework but applies formal underwriting standards. Fannie Mae's guidance on comparable sales requires appraisers to select comparables and document market-based adjustments rather than apply simple rules of thumb.

For renovation financing specifically, HUD's 203(k) program treats the after-improved value as subject to completion controls, with the Standard 203(k) allowing up to 12 months for rehab and the Limited 203(k) up to nine months, along with required work write-ups and, in many cases, a consultant.

Lenders typically cap renovation loans at 70% to 75% of ARV, a threshold widely cited by SmartAsset, which means an unsupported ARV estimate often gets discounted during underwriting.

What makes an ARV credible to an underwriter:

  • A detailed contractor scope of work with itemized costs.
  • Closed comparable sales with documented adjustments, not listing prices.
  • A realistic rehab timeline that aligns with escrow holdback schedules.
  • County or MLS sold data backing every comp used.

ARV Compared With After Repair Cost and Market Value

These three figures get confused constantly, and mixing them up leads directly to overpaying. Market value, as most people use the term, describes what a property is worth today, in its current condition, which may be outdated or in need of work. ARV describes what that same property will be worth after renovations bring it in line with updated comparable sales.

After repair cost is different still: it is simply the dollar amount you spend on labor and materials to get from as-is condition to the renovated state that ARV assumes. None of these numbers substitute for each other, and your profit margin depends on keeping all three distinct in your spreadsheet.

A property's current market value might sit at $220,000. Your after repair cost, the actual rehab spend, might run $45,000. Your ARV, the projected value once that work is done, might land at $308,333, following the comps example above. Profit is not simply ARV minus market value; it has to account for purchase price, holding costs, financing costs, and the actual rehab spend together. Investors who treat ARV as a stand-alone number, without weighing it against after repair cost and the original market value, routinely underestimate how thin their margin really is once every expense is counted.

ARV Compared With After Repair Cost and Market Value — overview diagram

How ARV Shapes Your Offer Price and Profit Margin

Every number in a flip deal flows backward from ARV. Once you have a defensible after repair value, you subtract your target profit, your rehab budget, and your carrying costs to arrive at the maximum price you can pay for the property. Skip this sequence, or start from the asking price instead of ARV, and you risk locking in a deal that cannot produce a real return.

ARV deductions leading to maximum offer price

Profit margin calculations also depend on how conservatively you built your ARV. An ARV built on three tightly matched, recently closed comps supports more confidence than one built on two stale sales and a listing price. If your comps are soft or your market is shifting, trimming your assumed ARV by a few percentage points before running your offer math gives you a buffer against appraisal disputes later.

This is also where lender caps reenter the picture. Running the numbers both ways, your target profit margin and the lender's ARV-based cap, before you make an offer keeps you from committing to a purchase price the financing cannot actually support.

A Mortgage Specialist's View on Presenting ARV to Lenders

An ARV number only helps you if a lender trusts it. In practice, that means packaging your comps, a signed contractor scope of work, and a realistic rehab timeline together, rather than submitting a single estimated figure and hoping it holds up.

When the renovation budget is substantial or the timeline is tight, a hard money or fix-and-flip loan often moves faster than a traditional rehab mortgage, since approval hinges more on the deal's numbers than on a borrower's income documentation; understanding ARM payment risk without refinancing can be crucial in choosing the right financing structure. For larger rehabs or ground-up work, construction financing may fit better. Some mortgage brokers work with investors across various loan types and can help match the financing structure to the deal once ARV and rehab scope are documented. For more on how lenders evaluate investor-submitted ARV estimates, see our guide to fix and flip loan applications.

— David

Where to Verify ARV Rules and Methodology

For the rules governing renovation financing, start with HUD's 203(k) program page and Fannie Mae's comparable sales guidance, both primary sources appraisers and lenders follow. For practical calculation walkthroughs, the BiggerPockets ARV glossary entry and SmartAsset's ARV explainer offer investor-friendly examples.

Sources

FAQ

What does 70% of ARV mean?

It is a quick screening heuristic rather than a precise valuation tool, used to filter out deals before running full comps and financing math.

What's a good ARV for a rental property?

There is no fixed "good" ARV figure, since it depends entirely on the specific property, local comps, and your target return. A useful ARV is one built from three to five closed, adjusted comparable sales that leaves enough margin after rehab costs, carrying costs, and financing to meet your profit goal.

How do you calculate the ARV?

You calculate ARV by pulling three to five closed comparable sales in renovated condition, adjusting each for size, condition, location, and time, then averaging the adjusted prices or price-per-square-foot figures. Multiplying an average price per square foot by your subject property's square footage is a common way to finish the calculation.

What does 75% ARV mean?

This threshold, commonly cited alongside the 70% figure, determines how much financing is available regardless of the purchase price an investor is willing to pay.