How to estimate ARV, step by step.

After-repair value is the number every other number in a deal hangs from. Estimate it the way an appraiser will — with sold comps, honest adjustments, and a disciplined reconciliation — and your offers stop being guesses.

What ARV is — and what it is not

ARV (after-repair value) is what a property would sell for after a defined renovation, in its current market, to a retail buyer. Three parts of that sentence do the work:

• After a defined renovation. ARV is meaningless without a spec. "Renovated" can mean paint and carpet or a full gut; each produces a different value.
• In its current market. ARV is a today number built from recent sales, not a hope about where prices go.
• To a retail buyer. The end sale usually involves a lender and an appraisal. If your ARV would not survive an appraisal, it is not an ARV — it is a wish.

Step 1: Define the renovated spec first

Before touching comps, write down what the finished property will be: bed and bath count (including any you plan to add), finished square footage, finish level, and layout changes. You are about to compare the subject to other houses — so decide what the subject will actually be. Comping a future four-bedroom against its current three-bedroom self is a category error that inflates or deflates everything downstream.

Step 2: Pull sold comps — with tight rules

The value comes from closed sales. Apply the filters in this order and loosen them one at a time only when you must:

1. Status: sold and closed. Active and pending listings are asking prices, not evidence. Use them later as a ceiling check, never as comps.
2. Location: same subdivision or immediate pocket first, widening gradually only as needed. Never cross a boundary buyers care about — a school attendance line, a major road, a rail line, a jurisdiction line. Distance in miles matters less than which side of the boundary you are on.
3. Recency: the most recent sales you can get. Prefer the last few months; the older the sale, the less it says about today.
4. Similarity: same property type, similar square footage, bed/bath count, lot size, and age or style. A rambler does not comp a two-story colonial just because they share a street.
5. Condition: renovated comps for a renovated subject. This is the filter beginners skip. A dated sale tells you what dated houses fetch — useful for your purchase price, useless for ARV.

Aim for a handful of sales that a stranger would accept as fair comparisons. Three strong comps beat ten loose ones.

Step 3: Adjust for the differences that remain

No comp matches perfectly, so you adjust the comp's sale price toward the subject. The direction rule: if the comp is better than the subject on a feature, adjust its price down; if worse, adjust up.

Work a hypothetical to see the mechanics. Suppose a strong comp sold for $300,000, but it has a two-car garage where the subject has one, and the subject has a half-bath the comp lacks. If garage stalls trade around $10,000 apart in your area and a half-bath around $5,000, the adjusted value of that comp for your subject is $300,000 − $10,000 + $5,000 = $295,000. The dollar figures are illustrative — real adjustment values come from observing paired sales in your own market — but the arithmetic is exactly this.

Adjust for the features buyers actually pay for: living area, bed/bath count, garage, lot utility, condition delta, and major systems. Skip trivia. If a comp needs so many adjustments it stops resembling the subject, drop it.

Step 4: Reconcile to one number

With adjusted comps in hand, resist the urge to average. Reconciliation means weighting: the comp most similar in location, condition, and recency gets the loudest vote. If your adjusted comps cluster — say a hypothetical $292,000, $295,000, and $301,000 — the cluster is your answer and the ARV sits inside it. If one comp lands far outside the cluster, investigate it (estate sale? off-market transfer? backing to a highway?) and usually exclude it rather than letting it drag the number.

Step 5: Sanity-check the result

• Price per square foot band. Divide each renovated comp's price by its finished area and check that your ARV implies a $/sqft inside that band. Out-of-band numbers need a written reason.
• The appraisal lens. Ask whether an appraiser, bound to closed sales and bracketing rules, could reach your number with the same data. If not, the retail buyer's loan won't either.
• Active-listing ceiling. If renovated actives are sitting unsold below your ARV, the market is voting against you.

Putting ARV to work: the 70% rule

A common rule of thumb for flip offers: maximum offer = (ARV × 70%) − repair costs. The 30% you are not paying covers purchase and sale costs, financing and carry, and profit. As a hypothetical: with an ARV of $300,000 and $40,000 of repairs, the rule gives $300,000 × 0.70 − $40,000 = $170,000.

Treat the percentage as a starting posture, not a law of nature — it is a heuristic, and the right margin depends on your actual costs, financing, and exit. But notice what the formula depends on: get ARV wrong by a little and the error passes straight through to your offer. That is why the comp discipline above matters more than the rule itself. For land-value deals where the structure is going away, the same residual logic applies with different inputs — see spotting teardown opportunities.

Mistakes that quietly wreck ARVs

• Comping to active listings. Asking is not getting.
• Condition mismatch. Unrenovated comps for a renovated subject, or the reverse.
• Crossing invisible lines. The comp half a mile away in the coveted school zone is not your comp.
• Letting one outlier set the number. One euphoric sale is a data point, not a market.
• Grading your own homework. When a deal is exciting, ARVs drift up. Lock the comp rules before you fall in love with the house — the parcel record can keep you honest, as covered in reading parcel and owner data.