Bathroom Plumbing Services in Cardiff

Vetted & insured engineers Clear pricing before work starts G3-qualified for unvented cylinders No gas work — plumbing only

Slow basin? Smelly waste? Bath that drains for ten minutes? Internal bathroom waste problems are our territory across Cardiff; external drain runs go to our drainage partner, and we'll tell you which yours is.

Cardiff water notes: Cardiff's Welsh Water supply from Brecon Beacons reservoirs is soft — scale is a minor player, and the city's plumbing work leans toward Victorian terrace pipework and the huge Cardiff Bay apartment stock. Cardiff's terraces in Roath, Canton and Grangetown carry classic Edwardian plumbing layouts, while Cardiff Bay and the city centre have added thousands of flats with communal risers and boosted mains. Mains supply here is managed by Welsh Water.

Small works: the everyday bathroom list

The routine calls across Cardiff: bath wastes leaking into the ceiling below, basin traps that were never quite tightened, mouldy failed silicone lines masquerading as mystery leaks, toilets running to the pan, and sanitaryware swaps where the old fittings have seized. Small, defined jobs — fixed same-visit with stocked parts wherever access allows.

Refits: first fix and second fix

First fix is where a bathroom is won or lost: supply and waste pipework routed to the new layout with correct falls on wastes, isolation valves on every feed, pipe runs pressure-tested before anything is boarded over. Second fix — connecting and commissioning sanitaryware, brassware and wastes after tiling — is where the finish quality shows. We take either stage or both across Cardiff, working alongside your tiler and fitter or supplying the full wet-side scope.

Finding bathroom leaks properly

The stain on the ceiling below is an endpoint, not a source. We isolate systematically: run the basin only, then the bath, then the shower, then flush — checking the ceiling or access point between each. Supply-side leaks show without any water use; waste-side leaks show only during drainage; seal failures show only during shower use against that wall. Twenty minutes of method beats a day of exploratory demolition, anywhere in Cardiff.

Bathroom plumbing costs in Cardiff

Small works from £110 with standard parts included. Sanitaryware swaps are fixed-quoted per item. Refit wet-side scopes are priced from the layout drawing or a site visit — first fix and second fix itemised separately so you can stage the spend. No Cardiff job starts without an agreed figure.

Frequently asked questions

My bath drains slowly but the sink is fine — why?

Localised slow drainage points to that fixture's trap and branch — hair and soap build-up usually. If several fixtures slow together or gurgle, the issue is downstream in the shared run or external drains, which we route to our drainage partner honestly.

Do you fit bathrooms supplied by a showroom?

Yes — we take the wet-side scope (first and second fix) alongside your fitter or showroom installer, and coordinate sequencing with tiling. Sanitaryware is checked on delivery before the old suite comes out.

What's the difference between first fix and second fix?

First fix is pipework to the new layout before walls and floors close — the structural plumbing. Second fix is fitting and connecting sanitaryware and brassware after finishes. Quoting them separately keeps refit costs transparent.

Can a bath be converted to a walk-in shower?

Commonly, yes: the supply adapts easily and the waste is re-routed for a low-profile tray, with the critical detail being fall to the existing stack and proper tanking before tiling. We handle the wet side and flag any structural implications early.