Appraisal Fundamentals
The Cost Approach in a Residential Appraisal
Land value plus depreciated construction cost — how this approach works, and when it carries the most weight.
The Cost Approach estimates value by asking a different question than the Sales Comparison Approach: what would it cost, today, to build a comparable structure on this land, minus whatever value has been lost to depreciation? It's a useful cross-check on almost any assignment, and often the leading approach for new construction or genuinely unique properties.
The Three Building Blocks
Land Value
Estimated separately, typically by analyzing sales of comparable vacant lots or an allocation method appropriate to the market.
Cost to Rebuild New
The current cost to construct a replacement or reproduction of the improvements, using recognized cost data — not what the owner originally paid.
Less Depreciation
Physical wear, functional obsolescence, and external obsolescence are subtracted to reflect the improvements' actual condition and utility today.
When This Approach Carries the Most Weight
The Cost Approach tends to be most reliable for newer construction (less depreciation to estimate) and for unique or special-purpose properties where truly comparable sales are scarce. For an older home in an established neighborhood with plenty of recent comparable sales, it's usually developed as a supporting check rather than the leading approach.
What This Approach Does Not Mean
It doesn't mean your renovation invoices set the value, and it isn't simply "replacement cost minus your home's age in years." Depreciation reflects actual condition, functional utility, and market perception — not a straight-line formula — which is why the Sales Comparison Approach remains the primary reality check for most owner-occupied homes.
Frequently Asked Questions
Provided for general educational purposes based on USPAP and recognized cost-estimation methodology. Last reviewed: August 2026.