The top of any seawall cap must be at 5.50 ft above mean sea level. Certain lots facing Biscayne Bay wave action may choose to go up to 6.0 ft above MSL. The code uses MSL, not NAVD88 or NGVD29.
Source: Bay Harbor Islands Code of Ordinances Sec. 23-12(10)(c), (d), (g), (h) (Municode Supp. 10 Upd. 2) · Verified 2026-10
The elevation your city requires, the datum it is measured in, and the section of code that says so. One page.
Available for the cities whose rule we have verified and sourced.
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What applies across Miami-Dade County, and where each city departs from it.
The rule changes at the city line, not the county line.
What to look for, where to look for it, and what it means when you find it. Walk your wall in twenty minutes.
A screening sheet for owners, not an engineering inspection.
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