Diagnosing and repairing water main faults and pressure problems
Water Main and Pressure Repair
Water main and pressure repair covers diagnosing and fixing faults on the incoming water supply pipe to a property, and identifying the cause of low or inconsistent water pressure, which can range from a partially closed valve to a leaking or collapsed section of the main itself needing excavation.
Definition
What Water Main Repair covers
The water main is the pipe carrying the water supply from the street connection into the property. Faults range from a leak along its length, often only visible as a damp patch of ground or unexplained water usage, to a collapsed or undersized pipe restricting flow and causing low pressure throughout the property. Where the main itself needs replacing, the work is closely tied to groundworks, since it usually means excavating along the pipe's route.
Suitable for
- Persistent low or inconsistent water pressure not explained by an internal fault
- A suspected leak on the supply pipe between the boundary and the property
- Properties still served by an old lead or undersized main
- Water main repairs needed alongside other groundworks or driveway work
Not suitable for
- Faults on the water authority's main in the street, which is their responsibility to repair, not ours
- Low pressure caused by an internal fault such as a partially closed stopcock — this is diagnosed and, if that's the cause, resolved without excavation
Process
How the work is carried out
- 01
Diagnosis
Establishing whether the fault sits within the property's internal system or on the supply pipe itself, and tracing its route.
- 02
Investigation
Where the main itself is suspected, confirming the likely location and extent of the fault before any excavation.
- 03
Repair or replacement
Repairing the affected section or replacing the main along its route, coordinated with groundworks where excavation is needed.
- 04
Reinstatement
Making good the ground, paving or driveway disturbed by the works.
Typical timescale
A pressure diagnosis is usually completed within a single visit. Repair or replacement of the main itself depends on the length and route affected, and is confirmed once the extent of the fault is known.
Cost guidance
Water main and pressure repair is priced by the length and route of pipe affected, and is often carried out alongside groundworks, so we do not publish a guide price. We provide a written quotation after a site survey to establish the cause and scope of the work.
Limitations and exclusions
- Faults on the water authority's supply main up to the boundary are their responsibility, not ours
- Reinstating driveways, paving or landscaping disturbed by excavation is scoped as part of the works or quoted separately depending on the finish required
Areas we cover
Water Main Repair across Sussex, Surrey, Kent and South London
Local property styles, planning authorities and neighbourhood coverage for water main repair in each town we work in.
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FAQs
Water Main Repair FAQs
How do I know if the problem is my water main or something inside the house?
We start by testing pressure at different points and checking internal valves and fittings. If nothing internal explains it, we investigate the supply pipe itself, including checking for signs of a leak along its route.
Who is responsible for the pipe between the street and my house?
The section from the water authority's main up to your property boundary (the communication pipe) is generally the water authority's responsibility; from the boundary into the property (the supply pipe) is the homeowner's responsibility.
Will replacing the water main mean digging up my driveway?
If the main runs under a driveway or paved area, yes — excavation along its route is usually required. We coordinate this with groundworks and agree reinstatement of the surface as part of the work.
Discuss your water main repair project
Tell us about the property and what you have in mind, and we'll arrange a site visit.
Last reviewed 2026-07-28.