Underwriting

How to estimate after repair value without comps

Estimating after-repair value (ARV) can be tough when recent comparable sales are scarce, but it is not impossible. You'll need to broaden your search and apply adjustments more rigorously.

November 4, 2026 · 3 min read

Expanding your comp radius

When direct, recent comps are missing, you must cast a wider net. Start by expanding your geographic search. Look at sales from adjacent neighborhoods or even a wider radius than your typical half-mile. You might need to go out to a mile or two, depending on the area.

Also, extend your timeframe. Instead of just looking at the last three to six months, pull sales data from the last nine months or even a full year. The older the sale, the more adjustment you'll need to make for market changes, but it provides data points where there were none.

Adjusting for property differences

With a broader set of comps, you'll inevitably encounter properties that aren't exact matches. This means you need to become very precise with your adjustments. For each comparable sale, meticulously adjust for differences in bedrooms, bathrooms, square footage, lot size, and age.

Assign a hypothetical dollar value for each feature difference. For example, suppose an extra bedroom is worth $10,000 in a given market, or an additional 500 sq ft adds $25,000. Apply these adjustments systematically to bring each comp closer to your subject property's projected after-repair state.

Using active and pending listings

While active and pending listings are not true comparable sales, they offer insight into current market sentiment and buyer demand. An active listing shows what sellers are asking, and a pending listing shows what buyers are willing to pay, though the final price is not yet public. Use these as directional indicators, not definitive values.

Look at the average days on market for similar active listings. If properties are sitting for a long time, it suggests less demand or overpricing. If they go pending quickly, it indicates a strong market. These data points help you gauge the buyer pool for your future renovated property.

Consulting local experts

When comps are thin, local real estate agents, appraisers, or even experienced contractors can offer valuable qualitative insights. They might have a pulse on specific micro-markets or recent off-market sales that aren't publicly recorded yet. Speak with a few to get a consensus on market conditions and value ranges.

Remember, you're asking for their general market feel and trends, not a specific appraisal or offer price. Their experience can help you validate your broader comp search and adjustment methodologies, providing a sanity check on your own analysis.

The 'cost approach' sanity check

The cost approach is typically used for new construction, but it can serve as a rough sanity check when comps are scarce. This involves estimating the hypothetical cost to rebuild the property from scratch, adding the land value, and then subtracting any depreciation. Suppose building costs are $150/sq ft, and the land is worth $50,000. For a 1,500 sq ft house, this would be $150 * 1,500 + $50,000 = $275,000 before depreciation.

This method helps establish a floor or ceiling for value based on construction costs. It is less reliable for older homes with significant depreciation but can highlight if your estimated ARV is wildly out of sync with replacement costs. Use it as one data point, not the sole determinant.

Conservative underwriting

When you're dealing with limited comparable data, it is always wise to be more conservative in your underwriting. Build in a larger buffer for unexpected repairs, longer holding times, and a slightly lower ARV. This cushions you against potential market fluctuations or overestimating your projected sale price.

A conservative approach means you are less likely to overpay for the property, protecting your investment. If the market performs better than your conservative estimate, that's a bonus. It's better to be pleasantly surprised than financially strained.

Questions people ask

Can I use Zillow/Redfin estimates?

Online estimates can be a starting point for general market understanding, but they are often inaccurate, especially for distressed or renovated properties. They do not account for specific repair conditions or unique market nuances. Always rely on your own comparable sales analysis.

How far out should I look for comps?

Start with properties sold within a half-mile radius in the last six months. If that yields too few results, expand to a one-mile radius and up to nine to twelve months. Be prepared to make more significant adjustments for distance and time.

Is it risky to make an offer without good comps?

Yes, it is inherently riskier. The less reliable your ARV estimate, the higher the risk. That's why conservative underwriting, thorough adjustment, and seeking expert input become even more critical in such situations. You need to build in a larger profit margin to compensate for the uncertainty.