How to Analyze Comparable Sales Like a Pro Investor

Why Comps Matter More Than Anything

Your entire deal analysis — MAO, profit projection, and offer price — hinges on one number: After Repair Value (ARV). And ARV comes from comparable sales. Get your comps wrong, and every number downstream is wrong. Get them right, and you can make offers with confidence.

Comparable sales (comps) are recently sold properties that match your subject property in size, type, location, and condition. By analyzing what similar homes recently sold for, you can accurately project what your property will be worth after renovations.

Step 1: Define Your Comp Criteria

Before pulling a single comp, establish your search parameters:

• Distance: Within 0.5 miles of your subject property (expand to 1 mile only if 0.5 miles doesn't produce enough results)
• Time frame: Sold within the last 6 months (expand to 12 months only if necessary)
• Square footage: Within 20% of your subject (a 1,200 sqft property should pull comps between 960-1,440 sqft)
• Bedrooms/bathrooms: Match exactly or within 1
• Property type: Single-family to single-family, multi-family to multi-family
• Condition: Renovated comps for ARV (you want to see what fixed-up homes sell for)

Step 2: Pull 5-8 Comps

Use your MLS access, county recorder, or data provider to pull properties matching your criteria. You want 5-8 comps to start with. From those, you'll select your best 3-5 for final analysis.

Where to find comps:

• MLS (most accurate — requires agent or access)
• County recorder / public sale records
• Data providers (Bricked.ai, PropStream, BatchLeads)
• RealFlow / Realeflow

Step 3: Adjust for Differences

No two properties are identical. You need to adjust each comp based on how it differs from your subject. Common adjustments:

Positive Adjustments (comp is inferior → adjust UP)

• Comp has no garage, your property does: +$5,000-15,000
• Comp has fewer bedrooms: +$5,000-10,000 per bedroom
• Comp is in a slightly worse location: +$3,000-10,000
• Comp is smaller: +$40-80 per sqft difference
• Comp has no basement: +$5,000-15,000

Negative Adjustments (comp is superior → adjust DOWN)

• Comp has a pool, your property doesn't: -$5,000-15,000
• Comp has more bathrooms: -$3,000-8,000 per bathroom
• Comp is larger: -$40-80 per sqft difference
• Comp is in a better school district: -$5,000-20,000
• Comp was recently fully renovated to luxury standard: -$10,000-25,000

Example Adjustment

Subject property: 1,200 sqft, 3bd/1ba, no garage, needs full renovation

Comp: Sold for $185,000 — 1,350 sqft, 3bd/2ba, with garage, renovated

Adjustments:

• Size difference (150 sqft): -$9,000
• Extra bathroom: -$6,000
• Has garage: -$10,000
• Adjusted comp value: $150,000

Step 4: Compute Your ARV

After adjusting all comps, take the average:

• Adjusted Comp 1: $150,000
• Adjusted Comp 2: $162,000
• Adjusted Comp 3: $155,000
• Adjusted Comp 4: $148,000
• Average ARV: $153,750

Always round conservatively. In this case, use $150,000 as your ARV, not $153,750.

Step 5: Validate

Before locking in your ARV, validate with these checks:

1. Price per square foot — does your ARV align with the neighborhood's typical $/sqft? If the area averages $125/sqft and your ARV suggests $150/sqft, you might be too high.
2. Days on Market — are renovated homes in this area selling in 15 days or 90 days? Fast absorption supports higher ARV; slow absorption means you should be conservative.
3. Active listings — check current listings of comparable properties. If there are 10 renovated homes listed and none are selling, downward pressure exists.
4. Trend direction — are values in this area increasing or decreasing? A 6-month comp that sold at $185K might only support $175K if the market has softened.

Common Comp Analysis Mistakes

1. Using Zillow Zestimates as ARV — these are automated algorithms and frequently inaccurate by 10-20%. Always use actual comp sales.
2. Cherry-picking high comps — choosing only the highest comps to justify a deal. Use all comps, including the lower ones.
3. Ignoring time adjustments — a comp from 10 months ago might not reflect current values.
4. Comparing different property types — a single-family comp doesn't work for a multi-family analysis.
5. Not physically visiting the comp neighborhood — drive by your comps. Confirm the area supports the values.

The Bottom Line

Accurate comp analysis is the foundation of every real estate deal. Pull 5-8 comps within 0.5 miles and 6 months. Adjust for every difference. Average conservatively. Then validate with $/sqft, DOM, and trend direction. Master this process and you'll never overpay for a property.