How to Run Comps for Investment Property Like a Pro

Why Running Accurate Comps Is Your Most Critical Skill

You spot a distressed house with upside, but without solid comps, you’re flying blind. Overpaying by 10–15% can wipe out your entire profit margin before you start rehab. That’s why knowing exactly how to run comps for investment property isn’t optional — it’s the difference between a win and a costly mistake.

If you’re like many investors, you don’t have MLS access or a real estate agent’s backing. That complicates things but doesn’t make it impossible. You can still build a professional-grade ARV using public data and smart adjustments.

What Makes a Comparable Property Valid for Your Analysis?

Not every sale nearby counts. You need to narrow comps by:

• Proximity: Aim for properties within a 0.5 to 1-mile radius. Closer is better. Neighborhoods can shift block by block.
• Size: Within 10–15% of your subject’s square footage. A 1,200 sqft home shouldn’t be compared to a 2,000 sqft one.
• Age: Built within 10–15 years is ideal. Major age gaps mean different building standards and materials.
• Condition: Match the rehab or distress level. Comparing a fully renovated home to a teardown throws off ARV.
• Bedrooms/Bathrooms: Same count or close. A 3-bed, 2-bath isn’t comparable to a 4-bed, 3-bath.
• Recency: Sales within the last 3–6 months reflect current market conditions.

If you can’t tick most of these boxes, that comp loses credibility.

How to Find Comps Without MLS Access

MLS is the gold standard but not your only route:

• County Records: Most counties post recent sales online. It’s raw but reliable data.
• Zillow and Redfin: Use their sold section but be cautious — data can lag or be inaccurate.
• Revamp365: This platform pulls MLS data, public records, and market trends into one place. You get MLS-quality comps without needing an agent or MLS login.

Start by listing 5–7 potential comps that meet your criteria, then verify their details.

Adjusting Comps: Turning Raw Sales Into Accurate ARVs

No two properties are identical. Adjustments fix differences in size, condition, and features so you’re comparing apples to apples.

1. Square Footage: If a comp is 100 sqft larger and the market price per sqft is $120, subtract $12,000 from the comp value.
2. Condition: Estimate rehab costs or value differences. If your subject needs $20,000 in upgrades compared to a turnkey comp, deduct that amount.
3. Bedrooms/Bathrooms: Add or subtract value per bedroom or bathroom difference — typically $10,000–$15,000 per bedroom in many markets.
4. Lot Size: Larger lots can add value; adjust accordingly.

Be conservative with subjective factors. When in doubt, err on the side of caution.

Calculating a Weighted Average ARV from Multiple Comps

Don’t just average sale prices — weight them based on how closely they match your subject.

Assign weights from 1 (least similar) to 3 (very similar) for each comp based on criteria above.

Example:

Comp	Sale Price	Weight	Weighted Value
A	$250,000	3	$750,000
B	$240,000	2	$480,000
C	$260,000	1	$260,000

Sum weighted values: $1,490,000

Sum weights: 6

Weighted average ARV = $1,490,000 / 6 = $248,333

This method gives more influence to comps that better reflect your property.

Worked Example: Running Comps on a Distressed 3-Bed Fixer

You find a 3-bed, 2-bath, 1,300 sqft house built in 1990, listed at $180,000. It needs a full kitchen and bathroom rehab, estimated at $25,000.

You gather these comps within 1 mile, sold within 4 months:

• Comp 1: 1,280 sqft, 3 bed/2 bath, sold for $240,000, turnkey condition
• Comp 2: 1,350 sqft, 3 bed/2 bath, sold for $230,000, minor cosmetic work
• Comp 3: 1,300 sqft, 3 bed/2 bath, sold for $250,000, fully renovated

Adjustments:

• Comp 1: No sqft adjustment (close size), subtract $25,000 for subject rehab = $215,000
• Comp 2: 50 sqft larger = subtract 50 x $120 = $6,000, subtract $25,000 rehab = $199,000
• Comp 3: Exact size, subtract $25,000 rehab = $225,000

Weights:

• Comp 1: 3 (closest in condition and timing)
• Comp 2: 2
• Comp 3: 1 (condition difference)

Weighted ARV:

(215,000 x 3) + (199,000 x 2) + (225,000 x 1) = 645,000 + 398,000 + 225,000 = 1,268,000

Divide by total weight of 6 = $211,333 ARV

Your realistic ARV guides your offer and rehab budget.

What Are Common Pitfalls in Running Comps Real Estate Investors Should Avoid?

• Using outdated sales: Markets shift fast. A sale 12 months ago isn’t reliable today.
• Ignoring condition differences: A renovated comp inflates ARV if your property needs work.
• Comparing apples to oranges: Size, bedrooms, or neighborhood mismatches skew values.
• Relying solely on Zillow or Redfin: These sites can have stale or incorrect info.
• Not adjusting for market trends: Prices could be rising or falling; factor that in.

Avoid these mistakes and you’ll stop making offers that leave money on the table or trap you in bad deals.

How Does AI-Powered Comps Change the Game?

Manual comp analysis is solid but time-consuming and prone to human error. Platforms like Revamp365 combine MLS data, county records, and proprietary market adjustments to produce ARV estimates in seconds.

You get:

• MLS-quality comps without needing an agent or MLS login
• Automatic adjustments for size, condition, and location
• Drill-downs to verify underlying comps

This saves hours per deal and increases confidence in your numbers. When you’re analyzing multiple deals weekly, that advantage is huge.

What’s the Best Way to Use Your Comp Analysis Every Time?

Create a checklist you use on every deal:

• Identify 5–7 recent comps within 1 mile
• Confirm size, age, bedrooms, baths align
• Adjust each comp for condition and size
• Assign weights based on similarity
• Calculate weighted average ARV
• Cross-check with AI tools like Revamp365 for verification
• Watch for market trends and anomalies

A disciplined approach keeps your offers sharp and your portfolio growing.

Ready to Run Comps Like a Pro?

You’ve learned how to find reliable comps without MLS, make smart adjustments, and calculate ARVs that anchor your offers in reality. This skill alone can save you thousands or add tens of thousands in profit per deal.

Keep practicing your manual comp analysis while leveraging AI tools to speed up and verify your numbers. Your next deal is waiting — don’t let bad comps kill your edge.

For deeper dives, check out our ARV calculator and property comp analysis guide. If you’re scaling fix-and-flips, the fix and flip guide covers pipeline management and marketing. Wondering how Revamp365 stacks up? See our PropStream vs Revamp365 breakdown.