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Commercial roofs ยท Westchester

Commercial roofing in Westchester, FL

In Westchester, 18.6 percent of homes are in buildings with 10 or more units, according to the Census Bureau. That makes multi-unit roofs a large share of the local work. Many of these buildings are low-slope, and their roofs are judged by the county's stricter rules, not the state minimum. Before signing, a property manager should check the slope, the product approval and the drainage on each bid.

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Updated October 2026

A low-slope roof section covered in a granulated cap sheet beside a gray shingle slope, with neighboring rooftops, palms and trees under a pale sky.

Westchester figures this page uses

Housing units (ACS 5-year)
18,350
Share of homes in buildings with 10+ units
18.6%
People (2020 Census)
56,384

Building stock

Why multi-unit buildings here need a different roof plan

Westchester has 18,350 housing units, with a margin of error of plus or minus 995. The Census Bureau puts the median build year at 1971, and 74.7 percent of units predate 1980. For a building owner, that suggests many flat roofs are past their first covering and may have been patched more than once.

Miami-Dade County sits in the High-Velocity Hurricane Zone, which applies to Westchester's commercial roofs. The zone carries the strongest hurricane provisions in the state, adopted after Hurricane Andrew. A roof bid that quotes only the statewide minimum has not met the local standard.

  • Confirm the roof is inside the HVHZ rules before you compare bids.
  • Ask for product approval numbers, not just brand names.
  • Check that the slope is designed for drainage, not only for the old roof.

Permits and drainage

Permits, slope and drainage on a low-slope roof

Permits for Westchester are issued by Miami-Dade County Regulatory and Economic Resources, since Westchester is a census-designated place with no city building office. In the HVHZ, every roofing permit needs an HVHZ Uniform Roofing Permit Application completed by a licensed contractor, and inspections run at set stages of the work.

New low-slope roofs need at least a 1/4 unit in 12 slope under the HVHZ rules. Positive drainage means the roof clears water within 48 hours of rain. Miami Airport records 67.41 inches of normal annual rain, with rain on 89.6 days a year. That is more than 5 inches a month on average.

Comparing bids

What to ask for when Westchester bids come in

Ask each bidder for the Miami-Dade Notice of Acceptance number and check its expiration date. The NOA must be shown at the job site on request, and a product used outside its approval is not valid. The public product approval search can confirm a number.

A bid should state the membrane type, the ASTM standard it meets, and the edge system with its wind test. Single-ply TPO sheets should cite ASTM D6878, and PVC sheets should cite ASTM D4434 with reinforcing. Ask for the expected accelerated weathering test result, which should show 2,000 hours of exposure.

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Questions

Commercial roofing in Westchester: questions

Who issues commercial roof permits in Westchester, FL?

Miami-Dade County Regulatory and Economic Resources issues them, because Westchester is a census-designated place without its own building office. Every roofing permit in the High-Velocity Hurricane Zone needs an HVHZ Uniform Roofing Permit Application completed by a licensed contractor. Confirm the current county process with the building office before you schedule work.

Source: Miami-Dade County Regulatory and Economic Resources (RER) - Building & Permits, read Oct 5, 2026

Related: Commercial roofing

How many people live in Westchester, and how many units are in multi-unit buildings?

The 2020 Census counted 56,384 people in Westchester. The American Community Survey estimates 18.6 percent of homes are in buildings with 10 or more units, compared with 40.2 percent for Miami-Dade County as a whole. That lower share means fewer large buildings here than across the county, but roofs on those buildings still follow the same HVHZ rules.

Source: U.S. Census Bureau, 2020 Census counts (POP100, HU100) via TIGERweb tigerWMS_Census2020 layer 28 (Census Designated Places), read Oct 5, 2026

Related: Commercial roofing

What slope does a new flat roof need in Westchester?

The HVHZ rules require a minimum design slope of 1/4 unit in 12 for new low-slope roofs. Standing seam metal panels have their own slope test under ASTM E2140. Ask your roofer to show the slope on the plans, since drainage depends on it.

Source: 2023 Florida Building Code, Building, 8th ed., Chapter 15 (UpCodes viewer, unofficial transcription), read Oct 5, 2026

Related: Commercial roofing

How much rain falls on a commercial roof in Westchester?

Miami International Airport records a normal annual rainfall of 67.41 inches, with 89.6 days a year of measurable rain. A flat roof needs drainage that clears water within 48 hours of a storm. Confirm the drain and overflow design before you accept a bid.

Source: NOAA NCEI U.S. Climate Normals 1991-2020 (access data service), read Oct 5, 2026

Related: Commercial roofing

Nearby

Commercial roofing near Westchester

Sources for this page(36)
  1. 1.Housing units (ACS 5-year): 18,350. U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25001, via Census Reporter API. Read Oct 5, 2026.
  2. 2.U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25035, via Census Reporter API. Read Oct 5, 2026.
  3. 3.U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25034, via Census Reporter API. Read Oct 5, 2026.
  4. 4.U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25035, B25034, B25024, via Census Reporter API. Read Oct 5, 2026.
  5. 5.Florida Building Commission, 'Setting New Standards for Safety: The Florida Building Code' (2004 publication; wind-speed figures in it are outdated and not used). Read Oct 5, 2026.
  6. 6.U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25024, via Census Reporter API. Read Oct 5, 2026.
  7. 7.Permit office: Miami-Dade County Regulatory and Economic Resources (RER) - Building & Permits. Miami-Dade County Regulatory and Economic Resources (RER) - Building & Permits. Read Oct 10, 2026.
  8. 8.NOAA NCEI U.S. Climate Normals 1991-2020 (access data service). Read Oct 5, 2026.
  9. 9.Miami-Dade County RER, Board and Code Administration Division, Product Approval. Read Oct 5, 2026.
  10. 10.Hurricane Matthew (2016). NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Matthew (AL142016). Read Oct 5, 2026.
  11. 11.Hurricane Irma (2017). NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Irma (AL112017). Read Oct 5, 2026.
  12. 12.Share of homes in buildings with 10+ units: 18.6%. U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25024, via Census Reporter API. Read Oct 5, 2026.
  13. 13.People (2020 Census): 56,384. U.S. Census Bureau, 2020 Census counts (POP100, HU100) via TIGERweb tigerWMS_Census2020 layer 28 (Census Designated Places). Read Oct 5, 2026.
  14. 14.U.S. Census Bureau, Building Permits Survey county annual files (co2025a.txt, co2020a.txt). Read Oct 5, 2026.
  15. 15.FBC-Building 2023 Chapter 2 definitions. Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7).
  16. 16.Florida Statutes, section 553.842 (2026). Read Oct 5, 2026.
  17. 17.2023 Florida Building Code, Building, 8th ed., Chapter 15 (UpCodes viewer, unofficial transcription). Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7). Source URL inherited from C-14 (the research cites it "as C-14").
  18. 18.miamidade.gov. Read Oct 5, 2026.
  19. 19.Florida Building Commission. Read Oct 5, 2026.
  20. 20.ASTM International. Read Oct 5, 2026.
  21. 21.ASTM International. Read Oct 5, 2026.
  22. 22.FBC-B 2023 Ch. 15. Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7). Source URL inherited from C-14 (the research cites it "as C-14").
  23. 23.2023 Florida Building Code, Plumbing, 8th ed., Chapter 11 (UpCodes viewer, unofficial transcription). Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7).
  24. 24.Miami-Dade County Regulatory and Economic Resources (RER) - Building & Permits, Miami. Read Oct 5, 2026.
  25. 25.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Matthew (AL142016), NOAA National Hurricane Center. Read Oct 5, 2026.
  26. 26.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Irma (AL112017), NOAA National Hurricane Center. Read Oct 5, 2026.
  27. 27.U.S. Census Bureau, 2020 Census counts (POP100, HU100) via TIGERweb tigerWMS_Census2020 layer 28 (Census Designated Places), U.S. Census Bureau. Read Oct 5, 2026.
  28. 28.Florida Statutes, section 627.7011 (2026), Florida Legislature. Read Oct 4, 2026.
  29. 29.2023 Florida Building Code, Building, 8th ed., Chapter 1 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  30. 30.Florida Statutes, section 713.135 (2026), Florida Legislature. Read Oct 5, 2026.
  31. 31.NOAA NCEI U.S. Climate Normals 1991-2020 (access data service), NOAA National Centers for Environmental Information. Read Oct 5, 2026.
  32. 32.NOAA National Hurricane Center, Tropical Cyclone Climatology, NOAA National Hurricane Center. Read Oct 5, 2026.
  33. 33.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Dorian (AL052019), NOAA National Hurricane Center. Read Oct 5, 2026.
  34. 34.NOAA Atlas 14 Volume 9 version 2, partial-duration 24-hour depth estimates at the Westchester 2020 Census internal point (25.7454, -80.3535), NOAA Hydrometeorological Design Studies Center. Read Oct 5, 2026.
  35. 35.FRSA, "New 2023 FBC Eighth Edition is Now in Effect", 2024-02-13, floridaroof.com. Read Oct 5, 2026.
  36. 36.Miami-Dade County RER notice, Miami. Read Oct 5, 2026.

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Commercial roofing in Westchester

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