The Setup
San Francisco and Nashville sit at opposite ends of most CRE market indicators. The permit scope mix makes that opposition arithmetic.
In the last 90-day ingest window, San Francisco filed 2,922 building permits. Of those, 1,913 were renovation and 876 were repair. Twenty-two were new construction. The renovation-to-new-construction ratio: 87:1.
Nashville filed 894 permits in the same window. Of those, 386 were renovation and 308 were new construction. The ratio: 1.25:1.
The Chain
The dollar figures amplify the pattern. SF's 22 new-construction permits carried $138.3M in estimated cost — $6.28M per permit on average. Nashville's 308 new-construction permits carried $196.1M — $637K per permit on average.
That cost differential does not mean SF builds more expensively by nature. It means the projects that can clear SF's approval environment are categorically different from what clears in Nashville. A $6.28M average new-construction permit implies ground-up tower activity with substantial pre-approval investment sunk before a permit is issued. A $637K average implies ground-up infill, small multifamily, and commercial pad development — activity that responds quickly to demand signals.
Nashville is filing 14 times more new-construction permits at one-tenth the average cost. SF's renovation and repair volume (2,789 permits, $422.7M) dwarfs its new activity by both count and dollar share. Renovation represents 75.3% of SF's total permitted value; new construction is 23.8%.
Flip to Nashville: new construction is 34.5% of permit count and 65.5% of permitted value ($196.1M of $299.6M). Nashville's demolition count (69 permits, $2.3M) running alongside its new-construction volume signals active land recycling — old stock is being cleared and replaced, not merely maintained.
The Implication
The scope ratio encodes market phase more precisely than headline permit volume. A market at 87:1 renovation-to-new is in deep rehab mode: existing stock is being turned, maintained, and converted, but the pipeline for net-new square footage is near-zero. A market at 1.25:1 is in active supply formation.
For site selection and underwriting, this resolves differently. Rent growth in high-renovation-ratio markets is structurally supply-constrained — capex flows into existing stock, but new units do not appear. Absorption assumptions built on historical vacancy patterns will overstate available supply if the pipeline has dried to 22 permits per quarter. Tenant improvement allowances in high-renovation markets carry different risk profiles than in new-construction markets, where physical condition at delivery is known.
The permit scope ratio is also a regulatory signal. SF's 87:1 ratio does not reflect a shortage of development appetite — it reflects what survives the approval environment. The same permit register that shows 22 new-construction issuances likely contains hundreds of applications that did not progress. The ratio captures regulatory friction as an outcome, not as an input assumption.
What to Watch
SF's new-construction permit count (22 over 90 days) is low enough that any policy change — streamlined ADU approvals, by-right affordable housing, CEQA reform — would register as a detectable velocity shift in a subsequent 90-day window. A move from 22 to 50 new-construction permits would be a 127% increase and a meaningful inflection in a market that has been structurally renovation-bound.
Nashville's demolition-to-new-construction ratio (69:308, roughly 1:4.5) is the watch metric for pipeline health. If demolitions hold or rise while new construction filings slow, that divergence would signal a cooling in the active land-recycling cycle that has sustained Nashville's supply formation.
Limitations
The 90-day window captures issued permits, not completions or starts. Permit issuance leads actual construction by 30 to 180 days depending on project scale. SF permit data is sourced from city open-data feeds with observed delays of up to 21 days for issuance. Nashville data runs approximately 7 days behind. Estimated cost figures are applicant-declared and systematically underestimate actual construction costs for large commercial projects. Scope-type classification (renovation vs new construction) is drawn from permit-type codes and may differ from applicant intent where mixed-scope permits exist.
Data: building\_permits table, 2026-02-16 to 2026-04-08 ingest window. SF metro: 2,922 permits, $581.9M estimated value. Nashville metro: 894 permits, $299.6M estimated value.