When should first-fix plumbing happen on my extension?

Typically once the structure is weather-tight and internal stud or blockwork is in place, but before insulation and boarding that will conceal pipes. Exact timing is agreed with your builder so other trades are not waiting.

Do you supply all pipework and fittings?

We can supply standard plumbing materials as part of our quotation or work with materials procured by your builder where that suits the contract. Fixture fittings supplied by you are installed when compatible and on site.

Can you connect a new bathroom in the extension to the existing soil stack?

Often yes, subject to fall, diameter and building regulations constraints. Long runs may need pumped solutions or revised routing — we flag this during the plan review rather than on tile day.

How do you coordinate with kitchen and bathroom fitters?

We agree “ready for” dates for sinks, appliances and sanitaryware, attend when units are fitted if needed, and keep a shared snag list so second fix does not hold up your handover.

Will you extend the central heating to new radiators?

Yes. Heating pipework extensions and radiator feeds are part of extension plumbing. Boiler capacity and controls should be reviewed by your heating engineer to ensure the system can support additional emitters.

Extension & Renovation Plumbing Warrington | First & Second Fix

Common situations we help with

New kitchen or utility in an extension with no routed supplies yet
Additional bathroom or cloakroom requiring new soil and waste runs
Existing boiler circuit needing extended heating pipework to new radiators
Uncertainty about when first fix should happen relative to insulation and boarding
Multiple trades needing clear handover points for pipework and boxing
Building control or warranty questions about testing and visible workmanship

What this service covers

Pre-start review of plans, fixture schedules and appliance locations
First-fix hot and cold water pipework in copper, plastic or mixed systems
First-fix waste and ventilation pipework to agreed fall and route
Soil stack connections, branch wastes and inspection access where required
Heating pipework extensions, radiator feeds and manifold alterations
Second-fix installation of baths, showers, basins, toilets and sinks
Kitchen and utility appliance connection points with isolation valves
Outside tap and garden supply take-offs from new or existing mains routes
Coordination meetings with builder, electrician, tiler and kitchen fitter
Pressure testing and functional checks before floors are sealed
Labelling and documentation of isolations for future homeowners
Snagging visits for minor adjustments after decoration

What the work typically involves

You share drawings, fixture lists, target dates and who is managing the build — clarity here prevents rework later.
We walk the site early to confirm routes, boxing, joist notching limits and where cylinders or manifolds will remain accessible.
First fix is scheduled after the shell is watertight but before finishes that hide pipework — we agree exact milestones with your builder.
Waste falls, supply pipe sizing and heating flows are installed to suit the fixtures specified, with photos of hidden work where helpful.
Second fix aligns with tiling, kitchen installation and radiator hanging — we maintain a live list of outstanding items as trades progress.
Testing includes water tightness checks, waste pour tests where accessible, radiator venting and handover of isolation guidance.

Repair or replacement?

Extensions rarely suit “repair” thinking — the opportunity is to install new pipework correctly first time. Where existing supplies feed the extension, we assess capacity and condition of the parent run and recommend renewal if it would undermine the new work.

Practical benefits

Programme-aware visits so boarding and screed are not delayed unnecessarily
Single plumbing contact for supplies, wastes and heating extensions
Routes designed for maintenance — not just the shortest chase
Experience with Warrington loft, rear and side extension layouts
Straightforward communication with builders familiar with local sites
Clear separation: gas boiler commissioning remains with appropriate registered engineers

Local plumbing in Warrington

Extension plumbing projects are undertaken across Warrington, Stockton Heath, Grappenhall, Lymm and nearby. Site visits and installs follow agreed weekday schedules aligned with your contractor.

Extension Plumbing in Warrington