Appraisers value homes using the cost approach and the sales comparison approach. Roof condition and age affect both:

Cost approach: the appraiser estimates the replacement cost of the roof, then applies depreciation based on age and condition. A 16-year-old asphalt roof has roughly 70-80% of its useful life expired — the appraiser deducts approximately $7,000-$12,000 from a $12,000 full replacement value, leaving $2,000-$4,000 of "remaining value" in the cost approach.

Sales comparison: when comparable sales exist with new roofs, a property with an aging roof trades at a discount. Published appraisal research places the discount at 3-8% of property value for roofs in poor or end-of-life condition in active real estate markets. On a $450,000 home, that is $13,500-$36,000.

FHA and VA lending impact: FHA appraisers are required to flag roofs with less than 2 years of estimated remaining life. A flagged roof must be repaired or replaced before FHA financing can close. This eliminates FHA buyers from purchasing your home — which in many markets means eliminating 25-35% of the buyer pool.

The most underestimated element of roof-age value impact is the insurance surcharge that transfers to the buyer's ongoing ownership economics:

Buyer A purchases a $450,000 home with a new roof: insurance $4,500/year.
Buyer B considers the identical home with a 16-year-old roof: insurance $9,000-$12,000/year (Citizens or surplus lines only).

The $4,500-$7,500/year insurance differential has a present value:
• At 10-year horizon, 5% discount rate: $34,722-$57,870 NPV

Sophisticated buyers (and their agents) calculate this and reflect it in offer price. The seller who refuses to replace or credit the roof isn't protecting their $15,000 — they're triggering a $35,000-$55,000 price reduction from buyers who ran the insurance math.

In Florida specifically: a home insurable at $4,500/year versus the same home insurable only at $11,000/year is a $65,000+ NPV difference over ten years. This gap is reflected in sales-comparison adjustments in appraisals — which is why roof replacement before listing consistently produces higher net proceeds than offering a credit or ignoring the issue.

When roof condition is a transaction issue, four outcomes are possible:

1. Seller replaces the roof before closing: best for all parties if time allows. Buyer gets a new roof with warranty; seller retains full market value; lender issues no conditions; insurance is available at normal rates.

2. Seller provides a credit: the buyer uses closing proceeds to finance the roof replacement post-close. Credit should equal 100% of replacement cost (not a partial credit) plus enough to cover permit fees and temporary occupancy inconvenience. Cash-at-close credits may not be available on all loan types — verify with the lender.

3. Price reduction: the contract price adjusts down by the replacement cost. Economically equivalent to a credit but may affect the appraisal basis.

4. Buyer accepts as-is with a full understanding: the buyer prices the replacement cost into their offer, secures insurance before committing, and plans the replacement at their timeline. Not naive acceptance — calculated acceptance with insurance confirmed.