Water Leak Repairs in Christchurch: Walls, Slabs and High Water Bills

Leaks inside a wall

A pipe leaking inside a wall cavity usually shows up as damp or bubbling gib, a musty smell, or in some cases mould at skirting level. We open a small, targeted section of the wall over the leak rather than removing the whole panel, repair the pipe, then pressure test before the wall is closed up again.

Where the same wall run has failed more than once, particularly with older copper or galvanised pipe, it's often worth rerouting that section through a more accessible space like a ceiling or cupboard rather than repairing in the same spot again.

Leaks under a concrete slab

Under-slab leaks are common in Christchurch homes built with in-slab hot and cold water lines, particularly from the 1960s to 1980s. Once acoustic or thermal detection has pinpointed the leak, the repair options are usually a small, localised concrete cut to access and repair the exact pipe, or rerouting the line above the slab through the ceiling or wall space to avoid future slab leaks altogether.

Rerouting costs more upfront but means no further slab cuts if that pipe run fails again later, which is a real risk with ageing under-slab copper.

Leaks outside in the garden or driveway

• Underground supply lines to outside taps or irrigation systems
• The pipe run between the toby and the house, sometimes decades old
• Joints disturbed by tree roots, retaining wall work or ground movement
• Connections to sheds, garages or sleepouts added after the original build

Why the water bill matters

A leak that's small enough to stay hidden can still waste a significant amount of water over weeks or months, and you're paying for every litre whether you can see it or not. If your bill has jumped with no change in household habits, it's worth doing a meter test before it goes further.

Repair vs replace

• A single, isolated leak in otherwise sound pipe is usually a straightforward repair
• Repeated leaks in the same pipe material point to wider corrosion or stress, and replacement is often more cost-effective long term
• Galvanised steel pipe past its practical lifespan is rarely worth patching more than once
• Copper pipe stressed by earthquake-related ground movement may need more than one section addressed at a time

After the repair

Every repair is pressure tested before we close up any wall, slab or trench, and for restricted plumbing work you'll get a certificate of compliance for your records. We'll also flag anything nearby that looks like it's heading the same way, so you're not caught out again in six months.

Frequently asked questions