Monroe County
Structural engineering in Marathon.
The City of Marathon runs through the Middle Keys around Vaca Key. Like all of Monroe County it is outside the High-Velocity Hurricane Zone, but design wind speeds are among the highest in Florida and nearly every parcel is in a special flood hazard area.
Marathon's canal-front and waterfront lots make flood elevation, V-zone rules, and below-flood enclosure limits central to most designs. We prepare the sealed engineering a Marathon permit needs, with flood zone, base flood elevation, and datum confirmed from each parcel's FIRM and survey.
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What we typically engineer here.
- Ground-up elevated homes and additions on canal-front lots
- Below-base-flood enclosure, deck, and boat-lift engineering
- Wind design and opening protection per the wind region
- Foundation and tie-down engineering for coastal conditions
- Milestone (recertification) inspections for qualifying buildings
Not HVHZ, but very high wind
Marathon follows the Florida Product Approval (FL#) regime rather than the Miami-Dade NOA regime, with wind-borne-debris opening protection still required for the wind region. The parcel's design wind speed comes from the ASCE 7 hazard tool per project.
Flood governs the design
Nearly all Marathon parcels are in special flood hazard areas, VE on the open water and AE along the canals. Elevated construction, below-base-flood enclosure limits, and V-zone requirements frequently drive the structure. Zone, BFE, and datum are confirmed from the parcel's FIRM and survey.
Permit timing (ROGO)
The Keys' Rate of Growth Ordinance (ROGO) can affect permit timing, especially for new units. It is a permitting-schedule matter rather than an engineering one, but worth planning around early.
Recertification
Florida's statewide milestone inspection (FS 553.899), called a recertification inspection locally, applies to condominium and cooperative buildings three or more stories, first at 25 years, then every 10. We handle the structural inspection and sealed report.
Code & design basis
What governs work in Marathon.
Jurisdiction-level facts below are confirmed against primary sources. Parcel-specific values such as exact wind speed, flood zone, and zoning are confirmed per project for your address.
- HVHZ
- No, Monroe is not in the HVHZ
- Product approvals
- Florida Product Approval (FL#) regime; opening protection per wind region
- Wind design
- Very high wind region (180+ mph class); the parcel value is confirmed from the ASCE 7 hazard tool per project.
- Flood
- Most parcels are in special flood hazard areas (A/AE/VE); zone, BFE, and datum confirmed per project.
- Permit timing
- ROGO allocations can affect scheduling, a permitting matter, not engineering.
- Recertification
- The statewide milestone inspection (FS 553.899) applies, called a recertification inspection locally: 25 years for coastal condo/co-op, then every 10.
- Code
- Florida Building Code 2023 (8th Edition); ASCE 7-22 wind provisions.
Services
What we engineer in Marathon.
Common questions
Marathon, FAQ
Is Marathon in the HVHZ?
No. Monroe County, including the City of Marathon, is outside the High-Velocity Hurricane Zone. Opening protection is still required for the wind-borne-debris region under ASCE 7, using Florida Product Approval products rather than the Miami-Dade NOA regime.
My Marathon lot is on a canal, how does flood affect the design?
Canal-front and waterfront lots are typically in AE or VE flood zones, so base flood elevation, V-zone construction rules, and limits on enclosures below the flood elevation often govern the foundation and structure. We read the zone, BFE, and datum from your FIRM and survey.
Does ROGO affect my permit?
The Rate of Growth Ordinance can affect the timing of new-unit permits in the Keys. It is a permitting-schedule matter rather than an engineering one, but we flag it so it can be planned around early.
Working on a project in Marathon?
Send the address and scope. We confirm the requirements for your parcel and jurisdiction.
Prefer to talk? Call 305-393-0690