ADU Rules: Katy vs Rosenberg
How do adu rules rules compare between Katy, TX and Rosenberg, TX?
Rosenberg has fewer restrictions than Katy.
Katy, TX
Fort Bend County
Katy's Zoning Ordinance defines an Accessory Dwelling Unit as a unit accessory to a principal single-family residence, used only by family members, guests, or employees working within the residence; commercial use is prohibited.
View full Katy rules →Rosenberg, TX
Fort Bend County
Rosenberg has NOT adopted a zoning ordinance or zoning map, so accessory dwelling units (ADUs), garage apartments, and guest houses are not restricted by use. The City confirms on its FAQ page: 'The City of Rosenberg has not adopted a Zoning Ordinance or Zoning map; however, there are land development regulations located in the Unified Development Code (UDC).' Land development is governed by the UDC (Ordinance No. 2017-07 as amended). Building permits are required under Chapter 1 of the Code of Ordinances and the adopted 2018 International Residential Code. Texas Local Government Code Chapter 211 (municipal zoning authority) is unused here. Subdivision deed restrictions and HOA covenants are typically the binding constraint on second dwellings.
View full Rosenberg rules →Key Facts Comparison
| Fact | Katy | Rosenberg |
|---|---|---|
| Allowed Use | Family, guests, employees only | - |
| Commercial Use | Prohibited | - |
| Utilities | Single metering with main house | - |
| Kitchen/Bath | Allowed | - |
| Separate Entrance | Allowed | - |
| Permit Contact | 281-391-4830 | - |
| Zoning | - | None — Rosenberg has no zoning ordinance |
| Governing Code | - | Unified Development Code (Ord. 2017-07) |
| State Authority | - | TX Local Gov Code Ch. 211 (unused) |
| Building Code | - | 2018 IRC adopted, Chapter 1 of Code |
| Permit Office | - | Building Permits & Inspections, 832-595-3500 |
| Real Constraint | - | Subdivision deed restrictions and HOAs |
Highlighted rows indicate differences between cities.
Katy FAQ
Can I rent out an ADU in Katy as a separate apartment?
No. Katy's zoning ordinance limits ADU occupancy to family members, guests, or employees working within the principal residence and prohibits commercial use.
Does an ADU need its own electric and water meter?
No. The ordinance requires the principal dwelling and accessory unit to be on single utility metering.
Are ADUs allowed throughout Katy?
Katy's ADU definition is in the citywide zoning ordinance, but subdivision deed restrictions and HOA covenants frequently prohibit ADUs in master-planned communities. Confirm with the Planning Department at 281-391-4803 before building.
Rosenberg FAQ
Can I build an ADU or garage apartment in Rosenberg?
Rosenberg has no zoning ordinance, so the City does not restrict residential use of property. You will still need a building permit under Chapter 1 of the Code of Ordinances and must comply with the 2018 International Residential Code, drainage requirements, and the Unified Development Code. The decisive constraint is usually your subdivision's deed restrictions or HOA covenants — most master-planned communities in Rosenberg prohibit secondary dwellings, separate kitchens, or rentals.
Does Rosenberg have ADU-specific size or setback rules?
No. Because the City has not adopted zoning, there are no use-based ADU rules — no maximum unit size, owner-occupancy requirement, or use restriction set by city ordinance. General building code, drainage, and UDC design standards apply (commercial setbacks of 30 feet from residential are referenced in the UDC). Texas Local Government Code Chapter 211 would authorize zoning, but Rosenberg has not exercised that power.
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