Who is responsible for drains in London?

Thames Water serves London and the Thames Valley and is responsible for public sewers and lateral drains beyond your boundary; drains serving only your home are yours (Ofwat, 2011).

Do I need a build-over agreement in London?

If you build over or within 3 metres of a public sewer in London, Thames Water requires a CCTV condition survey before granting one (Building Regs H4).

Are soakaways suitable in London?

Soakaways suit London's ground poorly in places — confirm with a BRE 365 percolation test.

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Septic Tank Emptying in London

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Licensed local tanker operators to empty septic tanks, treatment plants and cesspits, with legal disposal documented. We match you with up to 3 verified local specialists in London — a shortlist, not the whole market, so you compare quotes without being bombarded. Local specialists know London's drainage and deal with Thames Water regularly.

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What drainage in London actually looks like

Your water company

Thames Water serves London and the Thames Valley. It's responsible for public sewers and the lateral drains beyond your boundary — including build-over agreements.

Who's responsible? →

Local ground conditions

Much of London sits on shrinkable London Clay — poor for soakaways and high risk for subsidence and root ingress. Clay-rich south-east England accounts for over 75% of UK subsidence cases (BGS / Geobear).

Soakaway rules & costs →

Local housing age

London has a very high share of pre-1919 housing — over half of homes in boroughs like Haringey (54.3%) and Kensington & Chelsea (65.1%) (Health Foundation, 2024). Older stock means older clay drains, so collapses and root ingress are more common.

Why drains keep blocking →

When to book

Blockages spike in December–January as festive fat and wipes hit the sewers (Water UK). Autumn is the best time to survey — before winter rainfall raises the risk of flooding and backing up.

Drainage questions in London

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