Pipes and cables: check before the walls close
New pipes and cables disappear into walls, floors and ceilings within days. A pressure test and a few photos before they do saves breaking finished work later.
- 1.5×working pressure, a common water pipe test benchmarkPublished standard
- 0pressure drop on the gauge over the test periodPublished standard
- Pull wireleft in every conduit for future cablesGood practice
- Photosof every wall and ceiling before it closesGood practice
Before new pipes and cables are covered, water pipes should pass a pressure test, commonly at 1.5 times the working pressure, drains should fall to their outlets, cables should run in conduits with pull wires, and data cables should be kept apart from power. Ask to see the test gauge, and photograph every wall before it closes.
Why check before it is covered. A leaking joint or a missing cable found after tiling or painting means cutting into finished walls, floors or ceilings, then making good.
The checklist
0 of 13 checked · 0 issuesEach check shows its basis: Manufacturer Published standard Good practice. Hold points, in coral, are the moments to see the work before it is covered.
Before work starts
At the start, on existing services- Existing pipes are pressure tested and existing wiring is checked before anything new is added You learn what was already faulty, so it is not blamed on, or hidden by, the new work. Good practice
- New routes are marked on walls and floors as the drawing shows, and agreed Agreeing routes avoids clashes and pipes where you later want to drill. Good practice
Electrical
While conduits and boxes go in- Cables run in conduits, fixed firmly, with no sharp bends Conduits let cables be replaced without breaking walls. Good practice
- A pull wire is left in every conduit For adding cables later. Good practice
- Data, TV and intercom cables are kept apart from power cables Running them together causes interference. Good practice
- Socket and switch boxes are level and at the agreed heights Moving a box after tiling is a repair job. Good practice
Plumbing and AC
While pipes go in- Pipes are fixed with supports at regular spacing, with sleeves through walls and slabs Unsupported pipes move, knock and strain their joints. Good practice
- Drain pipes fall steadily to their outlets Flat drains block. Good practice
- AC refrigerant pipes are insulated along their whole length, and condensate drains fall Bare pipes sweat and stain ceilings. Good practice
Pressure test and photos
Before walls, floors and ceilings are closed- Water pipes are pressure tested, commonly at 1.5 times the maximum working pressure1.5× The test finds weak joints while they are still reachable. Published standard[1]
- The gauge holds steady for the test period, with no visible leaks A drop means a leak somewhere. Find it now. Published standard[1]
- A dated photo of the gauge at the start and the end Your evidence if a leak appears later. Good practice
- Photos or a video of every wall and ceiling with pipes and cables, before they close You will know where not to drill, and where to look first if something fails. Good practice
All 13 checks, including the hold point. Tick them on site, add notes and photos, and download a PDF to send your contractor. Free with a SoukLocal account.
Sign in freeQuestions to ask your contractor
- When is the pressure test, and can I see the gauge?
- Can I have photos of every wall before it is closed?
- Will every conduit have a pull wire?
- Are data cables run separately from power?
Questions
What pressure should new water pipes be tested at?
A common benchmark, from UK water regulations guidance, is at least 1.5 times the maximum working pressure, held for a set period with no drop on the gauge and no visible leaks. Ask your contractor which test they use and to show you the gauge.
Why photograph walls before they are closed?
So you know where pipes and cables run. It stops you drilling into them later, and shows a plumber or electrician where to look first if something fails.
Should existing pipes be tested before a renovation?
Yes. Testing existing pipes and checking wiring at the start shows what was already faulty, so it can be fixed in the same works rather than discovered after the new finishes are in.
Sources
Written from the working method statements of a Dubai design-and-build contractor, then checked against manufacturer data sheets and published guidance. Each check says which. Manufacturer figures are examples from one product or system: follow the data sheet for the product used on your job. This page helps you ask the right questions; it is not a certificate that work is sound.
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