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Key Biscayne · Miami-Dade County

Flat Roofing in Key Biscayne, FL

In Key Biscayne, a flat roof replacement on a typical 3,632 sq ft home runs about $26,700–$44,800, including the 20% High-Velocity Hurricane Zone adder (Blue Sky pricing as of October 2026); Blue Sky crews don't work here yet, so we'll refer you to a licensed roofer who does.

Blue Sky crews don't work in Key Biscayne yet

Send us your address and project and we'll refer you to a licensed roofer who works here.

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What flat roofing costs in Key Biscayne

For the median single-family home here: 3,632 sq ft of living area, about 48 roof squares.

  • Flat / low-slope

    Modified bitumen or TPO membrane

    $34,600

    Most jobs $26,700–$44,800

    $600–$870 per square

Commercial roofs

Roofs on commercial buildings in Key Biscayne, priced per square because building sizes vary too much for a typical total.

Flat / low-slope
$1,200 per squareMost jobs $970–$1,480

Ranges start from Blue Sky's standard pricing (October 2026) plus the 20% High-Velocity Hurricane Zone adder and tighten as we complete jobs nearby. Installed price for a full replacement, including tear-off, permit, and disposal. Your written estimate after an inspection is the final price. How we price

Local rules that change the job

  • High-Velocity Hurricane Zone

    Miami-Dade County is in the HVHZ. Roofing products need HVHZ product approval (typically a Miami-Dade Notice of Acceptance), and the Florida Building Code's HVHZ roofing requirements apply to installation and inspections.

  • Who issues the permit

    Cities permit homes inside their limits and Miami-Dade County permits unincorporated addresses. A mailing city doesn't always match city limits, so the permitting office is confirmed from the parcel before filing.

  • Older homes

    71% of single-family homes in Key Biscayne were built before the statewide Florida Building Code took effect in 2002. Re-roofing an older home can trigger upgrades such as re-nailing the roof deck and adding a secondary water barrier; a written estimate should include them.

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