Which Deferred-Maintenance Issues Hurt Resale Value Most?

Direct answer: Zillow and the National Association of Realtors both identify the same category of issues as the most damaging to a home’s appraised value: structural and safety-critical systems, specifically roofing, foundation problems, and outdated electrical, because they signal costly repairs a buyer or lender will factor into financing. Neither source publishes a precise percentage of value lost per issue, so specific figures circulating online (like “5-15% off resale value”) should be treated as unverified estimates, not measured data.

What Actually Gets Flagged in an Appraisal

Zillow’s own guidance on what hurts a home appraisal is specific about which deferred-maintenance issues carry real weight: a leaky roof, foundation cracks, and outdated electrical systems, because each one “signals costly repairs” that a lender’s appraiser has to account for in the valuation, separate from the home’s cosmetic condition. This matters because these are structural and safety issues, not the surface-level wear (scuffed paint, dated fixtures) that a lot of home-organization content focuses on. A home can look tidy and still appraise lower if its roof or foundation shows real deferred maintenance.

The National Association of Realtors frames the same underlying dynamic from the market side rather than the appraisal side: a property in visible disrepair tends to sit on the market longer and either sell at a discount or not sell at all, since buyers factor the cost and hassle of major repairs into their offers, when they make one at all.

Why a Specific Percentage Figure Doesn’t Hold Up

Various home-services and real estate sites cite figures like homes with deferred maintenance selling “5-15% below market value,” or larger discounts for homes needing a major system replacement. These numbers are repeated widely, but neither Zillow nor NAR’s own published guidance, the two most relevant primary sources for this question, attaches an exact percentage to specific categories of deferred maintenance. Appraisal outcomes depend heavily on local market conditions, the specific issue, comparable sales, and how a lender’s appraiser weighs the finding, factors that don’t reduce cleanly to one universal percentage. The honest position is that deferred maintenance in structural and safety-critical systems reliably lowers value and can slow a sale, a real, sourced claim, without a single, precise, generally applicable percentage behind it.

The Practical Distinction This Creates

For a family deciding where to direct limited maintenance dollars, the appraisal-relevant priority list looks different from a cosmetic priority list. Roofing, foundation, and electrical issues carry real resale consequences even when a home otherwise shows well, which is a strong practical argument for treating a seasonal maintenance checklist and an actual maintenance budget as protecting the home’s value, not just its day-to-day comfort. The same underlying logic connects back to why deferred maintenance costs more in the first place: the categories that hurt resale value most are largely the same categories that generate the most expensive insurance claims when neglected.

Sources: Zillow, “What Hurts a Home Appraisal?”. National Association of Realtors, Appraisal & Valuation. Specific value-loss percentages cited elsewhere online could not be traced to either source’s own published data and are disclosed here as unverified rather than presented as measured figures. Verified 2026-08-07.