Martin County adopts 2025 residential capacity analysis; staff and consultant warn limits in secondary areas

Martin County commissioners on Nov. 4 adopted the county’s 2025 Residential Capacity Analysis and associated Population Technical Bulletin, a statutorily required study that compares projected housing demand with available land and approved entitlements.

County planning staff and consultant Metro Forecasting presented the report and its methodology, emphasizing the analysis uses population projections to estimate housing demand for 2035 and 2045 and counts undeveloped parcels plus remaining entitlements and excess vacant units as supply. The study uses the Population Technical Bulletin (UF/BEBR data) as its demographic basis and followed the methodology in the county’s Comprehensive Growth Management Plan.

Consultant David Farmer summarized the principal findings: the 10‑year (2035) demand for housing can be met in aggregate, driven by significant available capacity in the eastern primary urban service area (over 200% of projected need there), while the eastern secondary area shows lower available capacity (about 92% of the 10‑year need). For the 20‑year (2045) horizon, the county still has aggregate capacity (about 137% overall), but again the eastern secondary area falls short—about 68% of projected demand—raising questions about future urban‑service boundary and capacity planning.

“I’m standing on the shoulders of my partner…we’re both licensed professional engineers and certified planners,” consultant David Farmer said in presenting methodology and projections. Planning administrator Clyde Doolin told the board the update is necessary because the county plans to consider an expansion to the primary urban service district later this month, and the comp‑plan policy requires an up‑to‑date residential capacity analysis prior to such changes.

Public comment included an attorney (Tyson Waters) who urged caution about elements of the methodology, alleging the report used data sources different from those specified in the comp plan, questioned use of a 3% “excess vacancy” allowance as too low, and argued that the analysis’ treatment of vacant uplands and wetlands could overstate realistic developable capacity. Staff and the county attorney responded the methodology follows the adopted policy and that prior administrative appeals had tested the approach.

The board voted unanimously to adopt the 2025 Residential Capacity Analysis and the Population Technical Bulletin. Commissioners discussed next steps and indicated they will consider whether additional planning or comp‑plan amendments are needed for areas of shortfall, particularly in the eastern secondary areas identified in the report.

Key numbers: the analysis counted roughly 60,232 housing units as the baseline pool for projections, found about 3,551 vacant housing units and 1,744 “excess vacant” units (above a 3% target), and identified more than 5,600 available units from existing entitlements. The consultant noted that the 20‑year horizon increases demand because it covers a longer timeframe.

Provenance: Presentation and public comment occurred during the agenda item for the Residential Capacity Analysis (staff: Clyde Doolin; consultant: David Farmer).