Bathroom Plumbing First Fix

What bathroom plumbing first fix covers

First fix is the in-wall and under-floor stage of a bathroom installation. The aim is to get all water supply and waste routes in the right place, secure, and proven watertight before finishes go on.

• Setting out pipe routes for hot and cold feeds to each fixture
• Installing waste pipework for bath, shower, basin and WC
• Positioning and fixing shower valves, outlets and pipe centres to suit your chosen fittings
• Installing isolation valves where appropriate for future maintenance
• Making good penetrations and preparing pipe exits ready for second fix
• Pressure testing and basic operational checks before walls and floors are closed
• Clear notes on what has been installed and what is needed for second fix

When this service is the right fit

This service suits bathroom refurbishments and new layouts where pipework needs to be concealed. It is especially useful if you are moving a shower, bath or basin, changing from a bath to a shower, or reworking wastes to improve falls and flow. Landlords and small commercial refurbishments also benefit where downtime needs to be controlled and the scope must be clear.

How the first fix is delivered

Work typically starts with a site visit to confirm your layout, fixture positions, access routes and any constraints such as joists, existing stacks and incoming mains. Pipework and wastes are then installed, clipped and protected, with key dimensions checked against the bathroom design and manufacturer requirements. Before the room is closed up, the system is tested and any snags are resolved so your other trades can proceed.

What happens after first fix

Once first fix is complete, your bathroom is ready for boarding, waterproofing and tiling. If you are booking a full bathroom install, the next stage is second fix, which connects and commissions the visible fixtures after finishes are complete. You should keep access to any agreed service points, as this makes future maintenance and upgrades far easier.