How to Pull Real Estate Comps Like an Appraiser

I've seen investors overbid on deals by $40,000 because they used bad comps. I've also seen investors walk away from solid deals because they didn't know how to read the numbers. Knowing how to pull real estate comps correctly is the single most important analytical skill you can build, and most people are doing it wrong.

What Appraisers Actually Do (And Why It Matters)

Here's what most people get wrong about comps: they think finding "nearby houses that sold recently" is enough. It's not.

A licensed appraiser follows a strict methodology. They're looking for properties that are as close to identical as possible, and when they can't find identical, they make dollar adjustments for every meaningful difference. That's the part most investors skip.

When you skip the adjustments, your ARV is garbage.

ARV stands for After Repair Value. It's the estimated market value of a property after all repairs and updates are complete. It's the foundation of every wholesale deal, fix-and-flip analysis, and BRRRR calculation. Before you make an offer, you need this number to be accurate.

The Four Criteria That Make a Good Comp

Real appraisers use four hard filters before they'll consider a sale as comparable. You should too.

Distance. The comp should be within 0.5 miles in a dense urban or suburban area, or within 1 mile in a rural area. Neighborhood matters more than distance, though. A comp a quarter mile away but across a major highway into a different neighborhood is a bad comp.

Square footage. Stay within 10-15% of the subject property's size. A 1,400 sqft house cannot be accurately compared to a 1,800 sqft house, even if they're on the same street. Size is the biggest driver of price, so this matters a lot.

Bedrooms and bathrooms. Match bed and bath count wherever possible. A 3/2 comp is not a good comparison for a 4/2 subject property. If you have to stretch here, note it and make an adjustment.

Recency. Appraisers typically want sales within the last 6 months. In a fast-moving market, go tighter, maybe 3 months. In slow markets, you can stretch to 12 months, but note that you're using older data. Anything beyond 12 months is almost always unreliable.

If you can't find 3 comps that meet all four criteria, you don't have enough comp data to make a confident offer. Either tighten your maximum allowable offer to account for uncertainty, or dig deeper before committing. Never force bad comps to fit. I learned this the hard way on a deal in Memphis where I used one comp that was technically in the right zip code but sat in a neighborhood with a very different buyer pool. Cost me $22,000.

How to Pull Real Estate Comps Step by Step

The best sources for comp data are the MLS (if you have access), Zillow's recently sold filter, Redfin, and PropStream. Each has slightly different data, so cross-reference when you can.

Start by setting your search filters: same property type (single family, not condo), same general area, sold in the last 6-12 months. Then export or screenshot the results and sort by price per square foot.

Price per square foot is the real unit of comparison. Raw sale price tells you almost nothing without knowing the size.

Price Per Square Foot = Sale Price / Square Footage

Example: $210,000 sale price / 1,500 sqft = $140/sqft

Once you have PSF for each comp, you average them (or weight them by how similar they are) to get your subject property's estimated PSF. Then:

ARV = Subject Property Square Footage x Estimated PSF

A Real Example: 3/2 in Phoenix, 1,400 Sqft

Let me walk through this. Say you're looking at a 3-bedroom, 2-bathroom house in Phoenix, 1,400 sqft, built in 1985, that needs full cosmetic rehab.

You search for recently sold 3/2 homes within 0.5 miles and find these three comps:

Comp 1: 1,380 sqft, sold 3 months ago, $196,000. PSF = $142.

Comp 2: 1,450 sqft, sold 5 months ago, $208,000. PSF = $143.

Comp 3: 1,410 sqft, sold 2 months ago, $201,000. PSF = $143.

Three comps, all within 10% of your subject's size, all within the last 6 months, all in the same neighborhood. Your average PSF is about $142.67.

ARV estimate: 1,400 sqft x $142.67 = $199,738. Call it $200,000.

That's your ceiling. Now you can work the deal math backward: what do you need to pay to make the numbers work?

Understanding the broader market conditions in your target area helps you interpret whether those PSF numbers are trending up or down, which affects how conservative to be with your ARV.

How Appraisers Adjust for Differences

Here's what separates a professional comp analysis from an amateur one: adjustments.

When a comp has an extra bathroom or 200 more square feet than your subject, an appraiser doesn't throw it out. They make a dollar adjustment. A full bathroom might be worth $5,000-$8,000. A garage might be worth $10,000-$20,000 depending on the market. An extra bedroom, maybe $8,000-$15,000.

The math works like this: if the comp sold for $215,000 but has an extra bathroom your subject doesn't have, you subtract maybe $6,000 from the comp's sale price before using it in your analysis. That gives you an adjusted sale price of $209,000, which is a closer apples-to-apples comparison.

Most investors skip this. Don't.

Using comps without adjustments in markets where properties vary significantly in features will systematically distort your ARV. In an area where half the houses have pools and half don't, using unadjusted comps will either undervalue or overvalue your subject property depending on which comps you grabbed. Phoenix, Florida, Texas markets especially, this is a real issue.

The Condition Adjustment: The One Most Investors Miss

Condition is the trickiest adjustment of all because it's subjective. But it's not optional.

If your subject property needs a full cosmetic rehab (new kitchen, baths, flooring, paint) and your comps are all fully updated properties that sold move-in ready, your actual ARV after repairs matches the comps. But your ARV right now, before repairs, is significantly lower.

This is why ARV is specifically "after repair value." You're not trying to figure out what the house is worth today. You're trying to figure out what it will be worth when it's fixed up to match those comps.

The comps represent your ceiling. The gap between today's as-is value and ARV is where rehab costs live. Before making any offer, do a thorough due diligence walkthrough to estimate what condition adjustments will cost you to close.

When to Walk Away From the Comp Data

Sometimes you pull comps and the market is just too thin to give you confidence. Three or fewer sales in the last 12 months. High variance in price per square foot (anything more than 15-20% spread between your cheapest and most expensive comp is a red flag).

I've walked away from deals not because the numbers were bad, but because the comp data was too thin to trust. If you can't defend your ARV number to a partner or lender, it's not a number you should be making offers based on.

Knowing when to walk away from a deal is just as valuable as knowing how to close one. Thin comp markets are one of the most underrated reasons to pass.

How DealBeast Handles Comps

Pulling comps manually takes 20-40 minutes per deal when you're doing it right. I used to do it by hand every time. Then I started using DealBeast.

DealBeast pulls comparable sales, applies the distance, size, and recency filters automatically, calculates price per square foot across the comp set, and spits out an ARV estimate in 30 seconds. It doesn't replace your judgment, but it gets you to a defensible starting number fast, so you can spend your time on the deals that actually pencil out instead of grinding through comps on every lead.

For investors analyzing 10-20 deals a week, that time savings is real.

How to run comps without MLS access

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FAQ: How to Pull Real Estate Comps

What makes a good real estate comp?

A good comp is a similar property (same type, size within 10-15%, same bed/bath count) that sold within the last 6-12 months, within 0.5-1 mile of your subject property. The closer the match on all four criteria, distance, size, features, and recency, the more reliable the comp.

How many comps do I need to calculate ARV?

You need at least 3 solid comps to have a defensible ARV estimate. Appraisers typically use 3-5. Fewer than 3 comps means your estimate has significant uncertainty built in. If you can only find 1-2 good comps, price conservatively and build in extra margin.

Can I pull real estate comps without MLS access?

Yes. Zillow's recently sold filter, Redfin, and PropStream all provide sold data that's close to MLS quality. The data is slightly delayed (sometimes 2-4 weeks behind MLS), but for most deals it's more than accurate enough to build an ARV estimate.

How do you calculate ARV from comps?

Divide each comp's sale price by its square footage to get price per square foot. Average the PSF across your 3-5 comps. Multiply that average PSF by your subject property's square footage. That gives you your ARV estimate. Adjust for meaningful differences in features and condition.

How recent do comps need to be?

Use the last 6 months as your default. In fast-moving markets or after a significant market shift, tighten to 3 months. In slow or rural markets, you can stretch to 12 months, but note the reduced confidence. Sales older than 12 months should only be used as a last resort when there's no other data.

What's the difference between how to pull real estate comps and running a CMA?

A CMA (Comparative Market Analysis) is typically run by agents and can include active listings and pending sales in addition to closed sales. When you're pulling comps for investment purposes, you should focus primarily on closed sales. Active listings represent asking prices, not what buyers are actually willing to pay.

How close should comps be in square footage?

Stay within 10-15% of your subject property's size. For a 1,400 sqft house, that means comps between roughly 1,190 sqft and 1,610 sqft. Outside that range, the size difference starts to meaningfully affect the price per square foot comparison and your adjustments become less reliable.

How to calculate ARV using your comps

Using comps to calculate your maximum allowable offer

How DealBeast uses comps in its analysis

This article is for educational purposes only and does not constitute investment or financial advice. Real estate markets vary significantly by location. Always conduct your own due diligence before making any investment decision.