Ironclad Plumbing wrote this codes guide because knowing what requires a permit, who pulls it, and how to verify protects you from unpermitted work that can cost you during a home sale or insurance claim.
Quick Answer
| Question | Short Answer |
|---|---|
| Does my plumbing job need a permit? | Water heater replacement, gas work, sewer line, repipe, and remodel rough-ins almost always require one. Simple repairs and fixture swaps usually do not. |
| Who pulls the permit? | Your plumber does. Not you. If they tell you to pull it yourself, that’s unusual. |
| How much does a permit cost? | Typically $75-$150 in the Austin area for residential plumbing. |
| What happens if the work isn’t permitted? | It won’t be inspected, which means nobody verifies it was done to code. This can become a problem when you sell the house, file an insurance claim, or have a failure that causes damage. |
| How do I check if a permit was pulled? | Austin: search the Austin Build + Connect portal (abc.austintexas.gov). Williamson County / Round Rock: contact municipal building department. |
| Should I worry about code even for small jobs? | For basic repairs, no. For anything involving gas, water heaters, sewer lines, or remodeling, yes. |
What Requires a Permit in Austin (and Most Surrounding Cities)
Plumbing permit requirements vary slightly between Austin, Round Rock, Cedar Park, Georgetown, and other area municipalities. But the general rules are consistent across the region.
Almost always requires a permit:
Water heater replacement. Whether tank or tankless, gas or electric. The permit triggers an inspection that verifies: the unit is properly connected, venting is correct (gas units), the expansion tank is installed (required by most local codes), the relief valve discharge pipe terminates correctly, and gas connections are safe. This is one of the most commonly unpermitted jobs in residential plumbing, and it’s one of the most important to get right because a poorly vented gas water heater can produce carbon monoxide.
Gas line work. Any new gas line, gas line extension, or gas line relocation requires a permit. The inspection includes a pressure test to verify no leaks. Gas work without a permit means no leak test by a third-party inspector. The risk is a gas leak in your home.
Sewer line replacement or major repair. Replacing all or a significant portion of your sewer line triggers a permit. The inspection verifies proper slope, correct fittings, and that the line will drain properly. Trenchless lining (CIPP) typically also requires a permit.
Whole-house repipe. Replacing all supply piping in the house requires a permit. The inspection verifies correct pipe sizing, proper support/hangers, correct connection methods, and that shutoff valves are accessible.
Remodel plumbing rough-in. If you’re moving drain lines, supply lines, or vent pipes as part of a kitchen or bathroom remodel, the rough-in work requires a permit. The inspector checks the work before walls are closed up, which means the inspection happens after plumbing but before drywall.
Usually does NOT require a permit:
Fixture replacements. Swapping a faucet, toilet, garbage disposal, or shower head in the same location with the same connections. You’re replacing a component, not modifying the system.
Simple repairs. Fixing a leak, replacing a shutoff valve, clearing a drain, replacing a wax ring, swapping a faucet cartridge, replacing a water heater element or thermocouple.
Water treatment equipment. Installing a water softener, carbon filter, or under-sink RO system typically doesn’t require a plumbing permit, though some municipalities may have requirements for the drain connection.
Gray area:
Dishwasher installation with existing connections: usually no permit. First-time installation requiring new supply and drain: may require a permit depending on municipality.
Hose bib replacement: Usually no permit. But if you’re adding a new hose bib where one didn’t exist (new penetration through the wall), some municipalities want a permit.
When in doubt, ask your plumber. They deal with the local building department regularly and know what triggers a permit in your specific city.
Who Pulls the Permit
Your plumber pulls the permit. This is standard. The licensed plumbing company applies for the permit through the local building department, pays the fee (which is included in your estimate), schedules the inspection after the work is done, and is present for the inspection if required.
If a plumber tells you to pull the permit yourself, that’s unusual for residential work. In Texas, plumbing permits are generally pulled by the licensed plumber or plumbing company, not the homeowner.
If a plumber says the job doesn’t need a permit and you’re not sure, call your local building department and describe the work. They’ll tell you in 2 minutes whether a permit is required. For Austin, that’s the Development Services Department: 512-978-4000.
What the Inspection Actually Checks
A plumbing inspection is not a full home inspection. The inspector looks specifically at the work that was done under the permit. For a water heater replacement, for example, the inspector checks:
- Is the unit the correct type and size for the location?
- Is the gas connection secure and leak-free (gas units)?
- Is the venting properly connected and routed (gas units)?
- Is the expansion tank installed?
- Is the temperature and pressure (T&P) relief valve installed and is the discharge pipe routed correctly (must terminate within 6 inches of the floor or to an exterior location, not into a wall or drain)?
- Are the water connections secure?
- Is the unit properly supported and accessible for maintenance?
The inspection takes 10-15 minutes. The inspector either passes it, fails it with specific corrections needed, or requires a re-inspection after corrections are made. If the inspection fails, your plumber is responsible for making the corrections and scheduling a re-inspection at no additional cost to you. The permit fee covers the original inspection and typically one re-inspection.
What Happens If Work Is Done Without a Permit
In the short term, probably nothing. Nobody shows up at your door to check. The work may be perfectly fine. Many unpermitted plumbing jobs function without problems for years.
The problems surface later:
When you sell the house. A buyer’s home inspector may notice a water heater with no permit record, unpermitted gas line work, or a remodel with no building permits pulled. Some buyers will require you to get retroactive permits and inspections (which means opening up walls to expose the work). Others will walk away. At minimum, it becomes a negotiation point that costs you money.
When you file an insurance claim. If a water heater that was installed without a permit fails and floods your house, your insurance company may investigate whether the installation met code. If it didn’t, and the lack of code compliance contributed to the failure, the claim may be denied or reduced. This is not guaranteed to happen, but it’s a real risk on a big claim.
When unpermitted work causes a safety issue. A gas water heater with improper venting can produce carbon monoxide. A sewer line with incorrect slope can back up into the house. These are the scenarios where code exists to protect you, and where the lack of an independent inspection creates genuine risk.
When you want to do future permitted work. If a future project requires a permit and the inspector discovers previous unpermitted work, they may require you to bring the old work up to code before they’ll sign off on the new project. This can significantly increase the scope and cost of the new project.
How to Verify a Permit Was Pulled
Austin: Go to abc.austintexas.gov (Austin Build + Connect). Search by your address. Permits filed against your property will appear with the permit type, date, status, and associated contractor. You can see whether a permit was issued, whether an inspection was requested, and whether it passed.
Round Rock: Contact the Building Inspections Division at 512-218-5530 or check the city’s online permit portal.
Cedar Park: Contact the Building Inspections office at 512-401-5600.
Other cities: Most municipalities in the Austin metro have an online permit search or a phone number you can call to verify. Google “[your city] building permit search” and you’ll usually find it.
What to look for: A permit should show the plumber’s name or company, the type of work, and ideally a “passed” inspection status. If your plumber said they pulled a permit and you can’t find it in the system, ask them for the permit number and verify it directly.
The Most Commonly Violated Code Items in Austin Residential Plumbing
These are the items inspectors most frequently flag on residential plumbing work:
Missing expansion tank on water heater. Most Austin-area jurisdictions require an expansion tank on tank water heaters, especially when a pressure-reducing valve (PRV) or backflow preventer creates a “closed system.” The expansion tank absorbs pressure spikes from thermal expansion. Without it, the T&P relief valve works harder and the water heater tank is under more stress. An expansion tank costs $50-$100 installed. Some plumbers skip it to save time or cut costs. Inspectors catch it consistently.
Improper T&P relief valve discharge. The discharge pipe from the water heater’s relief valve must terminate within 6 inches of the floor, pointed downward, or to an approved exterior location. It cannot discharge into a wall, into a drain line, or be capped/plugged. If it’s routed into the pan drain, some jurisdictions accept it and some don’t. The purpose is that if the valve opens (which means the tank is dangerously overheated), the hot water goes somewhere visible and safe, not into a hidden space where it causes damage you don’t notice.
Improper water heater venting (gas). Gas water heaters produce combustion exhaust that must vent to the exterior through the correct type and size of vent pipe. Common violations: undersized vent pipe, too many elbows in the vent run (restricts airflow), vent not properly connected to the draft hood, vent termination too close to a window or air intake. Improper venting can cause carbon monoxide buildup in the home.
Missing or improperly installed cleanout. Code requires accessible cleanouts at specific points in the drain/waste/vent (DWV) system. If a cleanout was supposed to be installed during sewer work and wasn’t, the inspector will flag it.
Incorrect drain slope. Drain lines must slope downward toward the sewer at a minimum of 1/4 inch per foot (for pipes 3 inches and under) or 1/8 inch per foot (for 4-inch pipe). Insufficient slope causes slow drainage and standing water in the pipe. Excessive slope causes liquids to outrun solids, leaving solids behind to build up. This is mostly relevant on sewer line and remodel work.
What This Means for You as a Homeowner
You don’t need to become a code expert. Your plumber should know the code and should be pulling permits when required. Your job is to:
- Ask whether the job requires a permit. For water heaters, gas work, sewer work, and remodels, the answer is almost certainly yes.
- Confirm the permit fee is included in the estimate. It should be a line item or stated as included.
- Verify the permit was pulled. Check your city’s online portal after the work is done.
- Be home for the inspection if possible. You don’t have to be, but being present means you hear the inspector’s feedback directly.
- Keep the passed inspection record. It’s documentation that the work was done to code by a licensed plumber. Valuable when you sell the house.
If a plumber suggests skipping the permit to “save you money” or “avoid the hassle,” understand what you’re giving up: an independent third-party verification that the work is safe and code-compliant. On a $75-$150 permit fee within a $2,000+ job, that’s not a savings worth taking.
Ironclad pulls permits on all work that requires them. The fee is included in our estimates. We schedule the inspection and handle any corrections. Call us at (833) 597-1932 if you have questions about whether your project needs a permit.