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Historic Preservation Compliance Cost Calculator
Historic standards add cost — credits offset.
Net cost after credits
$6,617,280
Historic premium $
$1,760,000
Total credit value
$3,142,720
How the math works
Historic budget = standard × (1 + premium). Credits = budget × (fed + state) × 92% syndication. Net = budget − credits.
$8M × 1.22 = $9.76M historic. × 35% × 92% = $3.14M credits. Net $6.62M — 17% less than standard despite premium.
How to Use
- Enter standard reno budget.
- Enter historic premium %.
- Enter SF.
- Enter federal HTC rate %.
- Enter state HTC rate %.
- Read net cost after credits.
Frequently Asked Questions
Historic premium?
Secretary of Interior standards require preserving character-defining elements. Adds 15-30% to standard renovation cost (special glass, matching masonry, restoration vs replacement). Adaptive reuse: 10-25% premium. Large historic: 30-50%.
Offsetting credits?
Federal HTC: 20% of qualified rehab expenditure. State HTCs (where offered): 10-25% additional. Syndicatable: 85-95 cents per credit dollar. Combined: 30-40% of QRE as cash credits. Offsets most of historic premium in strong state programs.
Process complexity?
Part 1 (eligibility), Part 2 (proposed rehab), Part 3 (completed rehab). 12-24 months application cycle. Specialist consultants required. Design constraints affect floor plan flexibility. Historic structures: complex legal/tax but strong credits make economics work.
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