The Final Plumbing Inspection

What happens at a final plumbing inspection?

At the final, the inspector walks the finished house and checks that the plumbing installed under the permit is complete, connected and safe to use. The 2021 IPC lists it as the third required inspection after underground and rough-in, and the 2024 UPC says it is made "upon completion of the installation." Under the IPC, the permit holder schedules it.

Expect fixtures to be run and drains watched, the water heater looked over, safety devices confirmed, and the earlier inspection records checked. The 2021 IPC calls the final test of the finished drain and vent system visual, in enough detail to confirm compliance. City checklists show what that means locally. Inverness's covers 18 items, from a full-open shutoff at the water heater and a main shutoff where the water enters the house to fixture shutoffs, trapped fixtures, vent flashings and a secured dishwasher drain hose.

What does the inspector check on the water heater?

The water heater carries several checklist items because it combines water, heat, pressure and often gas. On the plumbing side, the inspector looks at the shutoff, the relief valve and its discharge pipe, the drain pan where one is required, thermal expansion control and access. Gas piping, venting and electrical connections are checked too, sometimes under separate permits.

Under the 2021 IPC, the relief valve discharge pipe runs full size by gravity, is not trapped, ends no more than 6 inches above the floor or receptor, and has no threaded end, valve or tee. Where it may end differs by code: the IPC allows the floor, the heater's pan, a waste receptor or outdoors, while the 2024 UPC forbids ending it in the pan. The 2021 IPC also asks for a pan at least 1-1/2 inches deep with a 3/4-inch drain where a leak would cause damage, a 30-by-30-inch level working space at the controls, and a cold-water shutoff serving only the heater.

Earthquake strapping is another item in some regions. The 2024 UPC 507.2 calls for straps in the upper and lower thirds of the tank, the lower one at least 4 inches from the controls, and Los Angeles does not accept plumber's tape on heaters over 40 gallons. Placement choices made at rough-in are covered on water heater placement and sizing, and expansion control on backflow preventers and expansion tanks.

Which access panels are required?

Access is required for parts that need service or inspection after the walls close, and city checklists name the common ones. West University Place, Texas lists access panels for tubs, the main water valve and gas valves; the 2021 IPC requires access to every air admittance valve; and the 2021 IRC P3005.2.10 bars required cleanouts from concealed spots such as inside walls, floor-ceiling assemblies and crawl spaces.

Cleanouts also need working room: the 2021 IPC and IRC ask for at least 18 inches of clearance in front of a cleanout on 6-inch or smaller pipe. A panel tiled over or a cleanout boxed in by a cabinet leaves those parts out of reach. Mark these spots on your photos of the open walls before drywall so you can find them later.

What paperwork closes the permit?

A passed final, recorded by the building department, closes the plumbing permit; on a new home, final approvals lead to the certificate of occupancy. New Jersey's consumer page describes that order: once the project passes its final inspections, the builder certifies compliance and the construction official issues the certificate.

Ask for a copy of the signed-off inspection record or a printout of the permit's status, and keep the backflow test report if an assembly was installed. The FTC advises never making the final payment until the work is done and you are satisfied, and getting lien releases from the contractor, subcontractors and suppliers before you pay. A passed final is a clean point to do both. The permit side of this starts on the plumbing permit.

What if the final plumbing inspection fails?

A failed final usually means a correction list: the inspector notes what is missing or wrong, the contractor fixes it, and the final is booked again. Checklist items that can trip a final include a missing hose bibb vacuum breaker, a fixture not fastened, a relief pipe ending in the wrong place or a cleanout that is not accessible. ASSE International also says that if hot water was off at the final, the inspector should note that shower limit stops were not set or checked.

Keep an eye on time. The 2021 IRC voids a permit if more than 180 days pass between inspections, and the building official may grant written extensions. Corrections and how to read them are covered in why plumbing inspections fail.

What should you keep after the final plumbing inspection?

Keep a folder with the permit and final record, fixture and valve installation sheets, the water heater manual and warranty, expansion tank and PRV details, backflow test reports, and your open-wall photos. Moen's Posi-Temp sheet is marked to be left with the homeowner, and ASSE International says the maker's limit-stop instructions should stay with the end user, since the stop may need resetting when water temperatures change.

Final inspection numbers

• 6 inchesMaximum height of a relief valve discharge pipe's end above the floor (2021 IPC 504.6)International Code Council
• 30 x 30 inClear, level floor the 2021 IPC wants at the heater's control side (502.5)International Code Council
• 18 inchesClearance in front of a cleanout on 6-inch or smaller pipe (2021 IRC P3005.2.9)International Code Council
• 180 daysLongest gap between inspections before a permit lapses (2021 IRC R105.5)International Code Council
• 18Items on Inverness, Florida's plumbing final checklistCity of Inverness

Questions from the job site

Next sheets

• Trim-out: Setting fixtures, stops and supply lines
• Trim-out: Shower scald limits and who sets them
• Stage folder: The trim-out and final stage
• Top-out: How the top-out inspection works