Do I need a permit for addition or structural alteration in Katy?
Yes. In Texas, addition or structural alteration generally requires a permit, and Katy is no exception.
Additions to a Texas home almost always require a building permit plus separate trade permits, and enclosed additions trigger full residential plan review. Outside city limits, county authority over residential building is limited, so confirm which office has jurisdiction over your property before starting. Katy Code Sec. 3.02.053 requires a surveyor's form survey for residential construction with a concrete slab, with finished floor at least 12 inches above the centerline of the front street, 18 inches above the curb, or 12 inches above base flood elevation, whichever is higher, and a final as-built survey before a certificate of occupancy. Katy's local IRC amendments (Code Sec. 3.02.053 and 3.02.054) require 5/8-inch drywall on attached garage walls and ceilings next to the home and #3 rebar at 16-inch centers in slabs up to 4 inches thick. In a special or moderate flood hazard area, Katy requires a separate floodplain development permit (Code Sec. 3.04.008), administered by the city building inspector. Katy spans Harris, Waller and Fort Bend counties, and the survey must cite the FIRM panel for the property's county. Katy schedules all inspections through the Civic Access Site. Requests before 4:00 p.m. are scheduled for the next business day, and a foundation or final inspection cannot be scheduled until the Permit Office has approved all required documents.
Get the answer for your exact project
Answer a few questions to see the permits, documents and inspections that may apply in Katy.
Documents you may need
- Permit applicationRequired
- Construction plans and drawingsRequired
- Site planLikely required
- Structural or engineering detailsSometimes required
- City of Katy Application for Building Permit (through the Civic Access Site or by email to katypermits@cityofkaty.com), marked AdditionLikely required
- Construction plans (plan check fee of one-half the permit fee is due at submittal)Likely required
- Form survey and final as-built survey by a Texas-licensed surveyor where a concrete slab is poured, showing setbacks, easements, floor elevation and FIRM panelLikely required
- Floodplain Development Permit ApplicationSometimes required
- Separate electrical, plumbing and mechanical permitsSometimes required
Possible inspections
- Foundation inspection
- Framing and rough-in inspection
- Final inspection
- Foundation inspection (all documentation must be approved before it can be scheduled)
- Framing and trade rough-in inspections
Frequently asked questions
- Do I need a permit for addition or structural alteration in Katy?
- Yes. In Texas, addition or structural alteration generally requires a permit, and Katy is no exception. The documents and inspections sections on this page list what the building department typically asks for.
- Who issues the permit in Katy?
- The local building department for Katy handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.