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London Manchester
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Planned work · London · from £1,200 per connection

New Drain Installation in London

Extensions, garden rooms, new bathrooms and outbuildings all need waste to go somewhere lawful.

Get a fixed quote Or call 020 3674 8514
New drain installation in London
No call-out feeNo night or weekend surchargeFixed price before we start12-month workmanship guarantee

We design, dig, lay and connect new runs with the falls right and the paperwork done.

What you get

New drain installation in London: what the price includes

  • 01
    Design and Building Control

    Falls, access points and materials specified to Part H, with inspections booked and passed.

  • 02
    Connections to existing runs

    New chambers cut into live runs without flooding anything, sequencing matters and we've done it before.

  • 03
    Water company approvals

    Building near or over a public sewer needs a build-over agreement, we handle the application before anyone digs.

  • 04
    Soakaways and surface water

    Rainwater handled lawfully, soakaway sizing and percolation tests included where needed.

  • 05
    Built to Approved Document H and signed off

    Falls, bedding, inspection access at every change of direction, and connections made properly at the chamber. New drainage is inspected by building control, and work that was never notified is a problem that surfaces at the point of sale rather than at the point of building.

What this means in London

Local conditions we work around

Most of London still drains through Victorian infrastructure, much of it combined sewers carrying foul and surface water in the same pipe. Two consequences follow. Heavy rain can surcharge the system and push water back up through the lowest gully in a property, which is why some basements flood in a storm without any blockage at all. And the older clay runs beneath gardens and pavements have joints that tree roots find, so root intrusion is one of the most common things our cameras record.

Where we do this in London

Covered across London

Same published rate card and the same twelve-month workmanship guarantee everywhere below, there is no postcode loading. Each area has its own page with an arrival time taken from our job records rather than chosen for a website.

RickmansworthFulhamKensingtonChelseaChiswickEalingHammersmithIslingtonCamdenClaphamWandsworthNotting Hill All London areas →
Straight answers

New drain installation in London, your questions

What does a new drain connection cost?
From £1,200 for a straightforward new connection to an accessible run. Depth, distance and surfaces move it, the survey fixes the number before work starts.
Do I need permission to connect to the sewer?
Connecting to a public sewer needs the water company's approval, and building within three metres of one needs a build-over agreement. Skipping this surfaces at conveyancing, expensively. We do the paperwork as standard.
Can you do the groundwork too?
Yes, excavation, bedding, laying, backfill and reinstatement as one contract, one guarantee.
Can I connect to the existing drain myself?
You should not. An unauthorised connection into a public sewer is an offence, and a badly formed junction into a private run causes blockages directly above it for the next twenty years. Connections need forming properly and, where they are into a public sewer, agreeing with the water company.
Do I need a build-over agreement?
If you are building over or within three metres of a public sewer, yes, and it is your water company that grants it, not the council. We identify it at the survey, because discovering it after the foundations are in is expensive.
Foul and surface water together?
Only where the existing system is genuinely combined, which much of inner London is. New build almost always requires separate systems, with surface water to a soakaway or a surface water sewer. Getting it wrong is the most common drainage failure on extensions.
Is London drainage different?
Much of it is Victorian, and a great deal of it is combined, foul and surface water in the same pipe. Two things follow: heavy rain can surcharge the system and push water back up the lowest gully in a property with no blockage present at all, and the old clay runs under gardens and pavements have joints that tree roots find. Root intrusion is one of the most common things our cameras record here.
24 hours · 365 days · London

Water where it
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