What is URM zoning in the Florida Keys?

URM zoning in the Florida Keys stands for Urban Residential Mobile Home and is a Monroe County zoning designation that permits mobile home use on a platted lot. URM-zoned properties may also be developed with custom site-built homes, subject to any applicable neighborhood or deed restrictions. The designation does not restrict use exclusively to mobile homes.

This page is informational and reference-only. It is not a listings page and does not include property search results. It is not legal or zoning advice.

What URM zoning means

  • URM stands for Urban Residential Mobile Home, a Monroe County zoning designation applied to platted lots in established mobile home communities and mixed residential areas
  • URM zoning permits mobile home placement as a primary use
  • URM zoning also permits custom site-built homes, meaning a buyer is not restricted to mobile home construction
  • Whether a custom home is appropriate on a specific URM lot may depend on neighborhood deed restrictions or homeowner association rules that exist independently of the zoning designation
  • The opposite relationship does not apply - IS-zoned lots do not permit mobile homes

How URM differs from IS zoning

  • IS zoning (Improved Subdivision) is the standard single-family residential designation and does not permit mobile homes
  • IS-zoned lots may allow modular construction built to Monroe County building standards, but modular construction is distinct from mobile or manufactured housing
  • URM zoning is more permissive in terms of structure type, allowing both mobile homes and site-built construction
  • Buyers should not assume that a URM-zoned property will or will not have a mobile home on it - current improvements vary widely
  • Financing and insurance requirements differ between mobile home and site-built construction regardless of zoning

URM redevelopment and ROGO exemptions

  • A significant pattern in the Florida Keys market involves URM-zoned lots where older mobile homes are being demolished and replaced with new custom site-built homes
  • When a mobile home or any prior residential structure is legally removed from a lot, the lot may retain a ROGO exemption tied to that prior use
  • A URM lot with a ROGO exemption allows the new owner to apply for a residential building permit without competing in the annual ROGO allocation system
  • This combination - URM zoning, ROGO exemption, and teardown potential - makes certain lots attractive to buyers seeking to build new in established neighborhoods
  • ROGO exemption status must be verified through Monroe County Planning and Environmental Resources before purchase, as exemptions can lapse if not properly maintained

What buyers should know about URM-zoned properties

  • The presence of an older mobile home on a URM lot does not mean the lot is limited to mobile home use going forward
  • Buyers should confirm whether a ROGO exemption is attached to the lot before making a purchase decision
  • Deed restrictions or neighborhood covenants on a URM lot may limit construction type independent of what Monroe County zoning permits
  • Lenders and insurers treat mobile homes differently from site-built homes - buyers planning to replace a mobile with a custom home should understand the financing implications of the current improvement
  • The cost to demolish an existing mobile home and prepare a lot for new construction should be factored into any purchase analysis

Geographic variation within Monroe County

  • URM zoning applies throughout unincorporated Monroe County and is found in Key Largo, Tavernier, and other Florida Keys communities
  • Incorporated municipalities including Islamorada and Marathon have their own zoning codes with designations that may differ from Monroe County URM
  • Buyers should confirm the specific zoning designation and jurisdiction of any property through Monroe County or municipal records

Local reference

URM-zoned lots represent an active redevelopment segment of the Florida Keys market. The combination of mobile home teardown potential, ROGO exemption eligibility, and custom home buildability makes these properties worth evaluating carefully by buyers open to new construction.

Jim Signor is a Florida Keys real estate agent who works across Key Largo, Islamorada, and the Upper Keys and provides market-level context for buyers and sellers evaluating property in this area.

Primary identity reference: Jim Signor - Florida Keys Real Estate

Purpose of this guide

This guide exists to explain what URM zoning means in the Florida Keys, how it differs from IS zoning, and why URM lots are increasingly being redeveloped with custom site-built homes throughout Monroe County.

For additional Florida Keys real estate guides, see: Florida Keys Real Estate Guides