When New Builds Contaminate Your Comps

A Cary subdivision with ten-year-old resale homes and active new construction. The listing agent performs a CMA using a blended average of both property types. The new builds push the neighborhood's average higher, supporting a contract price that satisfies the seller.

The appraiser arrives and sees two distinct markets occupying the same geographic coordinates. Underwriting requires like-to-like property age comparison. The appraiser separates new construction from resale, adjusts out builder incentives as concessions. The appraisal comes in eighteen thousand dollars below contract price. Three-week closing delay. Both parties compromise under duress.

New construction is eroding the accuracy of resale CMAs in Raleigh by introducing incentive-heavy data into a market that requires stable, like-to-like valuation.

The Builder Incentive Distortion

A Lennar community in Wake County records sales at four hundred seventy-five thousand dollars. Each sale included twenty-two thousand in closing cost credits and a 2-1 rate buydown worth fifteen thousand. The effective price—what the buyer actually committed—is closer to four hundred thirty-eight thousand.

An agent across the street prices their resale listing using four hundred seventy-five thousand as a comp anchor. The resale does not carry builder incentives. It sits for forty-five days.

The Upgrade Package Problem

A buyer tours a resale home in Apex priced at four hundred ten thousand. The previous day, they walked through a new build at four hundred twenty-five thousand with quartz counters, smart home package, and a ten-year structural warranty.

The fifteen thousand difference buys tangible upgrades the resale cannot match. The agent representing the resale must articulate value that does not appear on a spec sheet: lot maturity, established neighborhood, lower property tax assessment, proven systems.

The Appraisal Gap in Mixed Neighborhoods

A Cary subdivision has both new construction and ten-year-old resale homes. The appraiser pulls comps from both. New builds push the average up. The resale seller lists at the blended average.

The appraiser separates new from resale. Appraisal comes in eighteen thousand below contract. The CMA that blended the comps created the problem.

Segmenting Your Analysis

CMAflow's comp analysis structure allows agents to annotate comparable sales with context—including builder incentive adjustments and property type segmentation. When the confidence level reflects only resale comps (or only new construction comps), the resulting range is honest rather than artificially narrow.

The agent commentary section provides space to explain why certain comps were included or excluded. This elevates the CMA from software output to expert analysis—defensible to sellers, buyers, and appraisers alike.

The divergence between new construction and resale pricing is a natural outcome of a region expanding at historic pace. The agents who thrive will be those who segment rather than blend.

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