Martin and St. Lucie counties occupy Florida's Treasure Coast — a region prized for its relatively undeveloped coastline, excellent fishing, and high quality of life. Building a custom home here involves county-specific regulations that differ meaningfully from their neighbors to the north, particularly around lot coverage, tree preservation, and wellfield protection zones.
Martin County: Florida's Strictest Growth Management
Martin County is widely recognized as having some of the most stringent land development regulations in Florida. The county's Comprehensive Growth Management Plan (CGMP) enforces strict density limits, mandatory open space requirements, and aggressive tree preservation ordinances that directly affect how a custom home can be sited on a lot.
Typical residential lots in Martin County face maximum impervious surface coverage of 35–45% depending on zoning district — meaning the combined footprint of your home, driveway, pool, and covered lanai cannot exceed that percentage of the lot area. This constraint requires thoughtful design that maximizes living space efficiency, which is one reason our two-story West Indies designs are particularly well-suited to Treasure Coast lots.
St. Lucie County: Growing Market, Evolving Standards
St. Lucie County is experiencing significant residential growth, and its building department has responded with robust digital permitting systems and faster review timelines than many neighboring counties. New home permits in unincorporated St. Lucie County typically move through initial review in 3–5 weeks — among the faster turnarounds on Florida's East Coast.
St. Lucie County has adopted the Florida Building Code fully and adds county-specific amendments primarily around wellfield protection zones (which restrict certain materials near public water supply wells), minimum finished floor elevations in flood-prone areas, and landscaping requirements under the county's Land Development Code.
Wind Exposure Categories on the Treasure Coast
Both Martin and St. Lucie counties fall within Florida's High Wind Zone, with design wind speeds of 140–155 mph depending on proximity to the coast and local topography. The exposure category (B, C, or D) assigned to a specific lot also affects structural requirements significantly — lots within 1,500 feet of the open ocean or major water bodies typically require Exposure D calculations, which drive more robust fastening schedules and higher uplift connector loads.
Our structural engineering team performs a site-specific exposure category analysis for every Treasure Coast project, ensuring that the structural design reflects actual site conditions rather than conservative assumptions that could unnecessarily increase costs.
Septic and Well Requirements in Rural Parcels
Many of the most desirable custom home lots on the Treasure Coast are located outside municipal utility service areas, requiring private septic systems and wells. Martin County Health Department (and FDOH for St. Lucie County) must approve septic system design prior to building permit issuance — a process that requires a percolation test and soil profile evaluation that can take 4–8 weeks.
For lots with challenging soil profiles (common in low-lying areas near the Indian River Lagoon), alternative septic technologies like aerobic treatment units (ATUs) or drip irrigation systems may be required, adding cost and ongoing maintenance obligations. We recommend soil and septic feasibility studies on any rural lot before committing to purchase.
Nick
Founder & Master Builder · Golden Temple Home Builders
March 2026 · 6 min read
