Appraisal Haircut of 40% to 70%: Backyard ADU Valuation & Property Tax Data Report (2026)
Appraisal Haircut of 40% to 70%: Backyard ADU Valuation & Property Tax Data Report (2026) Executive Summary: Fannie Mae Form 1004 appraisals credit detached accessory dwelling units with only 30% to 60% of construction costs due to off-GLA line-item adjustments and scarce neighborhood comps. Homeowners spending $200,000 to $350,000 on turnkey builds face immediate supplemental…
