Start by finding out who governs your address. Inside the Gonzales city limits it is the City of Gonzales Building Department. Many homes with a Gonzales mailing address are outside the limits, in unincorporated Ascension Parish, and the parish Office of Planning and Development issues their permits.
Do I need a permit for a driveway or patio?
We could not find an official page that says whether a plain driveway or open patio on your own lot needs a permit in Gonzales. The city's list covers building, pool, fence and sign permits and portable buildings over 200 square feet, and it does not mention flat paving. So the honest answer to whether you need a permit is to ask before you pour. Covers, carports and building slabs do need one. We check with the city or the parish for your address.
Do I need a permit to widen my driveway?
If you widen only on your own lot, see the answer above. If the wider drive needs a longer culvert, a second entrance or work in the roadside ditch, you need approval from whoever owns the road. Ascension Parish handles culvert permitting for first-access driveways on public rights of way through its Call Center. Airline Highway, Burnside Avenue and the other state routes belong to the state highway department, which has its own driveway permit.
Who owns the driveway apron and the culvert: me or the city?
The apron and the culvert sit in the public right of way, so the road owner controls what is built there. Who pays for and maintains them is set by the city, the parish or the state for that road. We could not confirm the Gonzales or Ascension rule from an official page. Ask the road owner before replacing an apron or a culvert, and get the answer in writing.
Who is responsible for the sidewalk in front of my house?
That is set by local ordinance, and we could not confirm the City of Gonzales rule. Many Louisiana cities put the upkeep on the adjoining owner. Baton Rouge is one: its code makes the lot owner responsible for repairing the sidewalk along the lot, including uneven and broken sections. In much of Ascension Parish there are no public sidewalks at all. Ask the city for your street.
The city sent me a notice to fix the sidewalk. Must I use the city's contractor, or can I hire my own?
Read the notice. It should name the ordinance, the deadline and the standard for the repair. Where the owner is responsible, the owner normally chooses the contractor, so you can hire your own, and a right of way permit may be needed. If the city sent a notice that is unclear, call the number on it and ask. We can price the repair from the notice and a photo.
How close to the property line can I pour? Do I need a survey?
Zoning for your lot sets the distance, and we check it for your address. Three limits apply almost everywhere here. Do not pave over a drainage or utility servitude. Do not fill the swale along the property line. Do not send your rain onto the neighbor. A survey is worth having when corner pins are missing or a fence is the only marker. The plat from your closing often shows the servitudes.
Do I need HOA approval?
Very likely, in the newer subdivisions around Gonzales and Prairieville. Recorded restrictions commonly cover driveway width, extra parking pads, boat and camper pads and decorative finishes. HOA approval and a government permit are two separate things. We can supply a sketch and a description for your application.
How much of my lot can I cover with concrete?
We could not confirm a single lot coverage or impervious surface percentage for Gonzales or Ascension Parish. The parish does regulate drainage closely through Appendix V of its development code. On a flat clay lot, every square foot of new paving sends more water to the ditch, so ask the permit office before paving a large share of a yard.
When does a retaining wall need an engineer or a permit?
Ask the permit office before building a wall that holds back soil. We found no published height trigger for the city or the parish. Fill is regulated, though. A notice from the Ascension Parish Office of Planning and Development says that where fill has been placed on a property, 36 inches at most, the owner or builder must supply a compaction test and a mitigation report signed by a Louisiana professional engineer. A wall that carries a driveway, slab or pool deck should have an engineer's design in any case.
Does the flood zone affect a slab?
For a building, yes. The same parish notice sets a 2.0 foot freeboard: the finished floor, and the finished floor of an attached garage over 500 square feet, must be 2 feet above the required flood level. Elevation certificates are required at the proposed, under-construction and final stages. The City of Gonzales lists a proposed elevation certificate form and a plot plan with its building application. Driveways and open patios are not building floors, but fill under them may still be regulated.
How do I find underground utility lines before digging?
Contact Louisiana 811 before any digging. The service is free, and it is how you find utility lines owned by the utilities. State law (R.S. 40:1749.13) requires notice at least 48 hours and not more than 120 hours before digging, not counting weekends and holidays. Louisiana 811 describes that as two full business days. Private lines are not marked. Sprinkler pipe, pool plumbing, a gas line to a generator and wiring to a shop are yours to point out. On our jobs we place the request.
I need a wheelchair ramp and a wider walk. What rules apply?
At a private house, the ramp is designed around the person who will use it: a gentle slope, level landings and a non-slip texture. A ramp fixed to the house may be treated as a structure, so we ask the permit office. At a business, ramps and accessible routes follow the accessibility standards on the approved plans. No national price was published for ramps, and we quote them after a visit.
My property is in a historic district or has old decorative concrete. Can it be replaced?
We did not find a historic district review for the City of Gonzales. Donaldsonville, across the river, has a listed historic district, and Baton Rouge has local historic districts, so ask those cities before changing anything visible from the street. Old scored or colored concrete can be imitated in pattern and tone. It cannot be matched exactly, and we tell you that before starting.
Sources: City of Gonzales Permits and Applications page; Ascension Parish permitting page and its Appendix V drainage notice; City of Baton Rouge and Parish of East Baton Rouge code, Title 2, Chapter 3; Louisiana R.S. 40:1749.13; Louisiana 811. Checked October 2026. General information, not legal advice.