5 county-level rules, plus city-specific rules for 4 cities in Montgomery County, Texas.
Verified from official government sources
Montgomery County has no zoning authority and therefore no ADU ordinance for unincorporated areas. ADUs on private property require a development permit as structures. Subdivision deed restrictions may prohibit additional dwelling units on single-family lots.
Montgomery County requires a development permit for sheds in unincorporated areas (any structure with a roof and one wall). Properties in or within 100 feet of the floodplain have additional requirements. A notarized acknowledgment is required for detached structures not connected to water/sewer.
Converting a garage into living space in unincorporated Montgomery County requires a development permit. The county has adopted the 2024 IFC and applicable IBC standards. Subdivision deed restrictions may prohibit garage conversions that change property character.
Montgomery County cannot regulate carports in unincorporated areas (no zoning). Conroe UDC requires building permit, 5-foot side setback, 25-foot rear. The Woodlands prohibits metal carports; Walden/Bentwater POAs strict.
Texas treats tiny homes by construction: foundation-built follow IRC Appendix Q (400 sq ft), THOWs are RVs under TX Manufactured Housing Act. Montgomery County cannot zone; Conroe requires 600 sq ft minimum dwelling.
Tex. Occ. Code Sec. 1201.003(12)-(13), (18)
'Manufactured home' or 'manufactured housing' means a HUD-code manufactured home or a mobile home. ... 'HUD-code manufactured home' has the meaning assigned by 42 U.S.C. Section 5402(6). The term does not include a recreational vehicle as defined by 24 C.F.R. Section 3282.15(b). ... 'Installation' means the temporary or permanent construction of the foundation system and the placement of a manu...
4 cities in Montgomery County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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Montgomery County Ordinance Hub →