New Water Supply Connection London — Thames Water Approved Contractors

When Do You Need a New Water Supply Connection?

• New build properties requiring their first water connection
• Converting a single property into flats — each dwelling needs its own supply
• Separating from a shared supply pipe to get your own independent connection
• Extensions or garden annexes requiring a new supply
• Commercial premises requiring a new or upgraded connection
• Properties where the existing supply is too small or too old to upgrade
  

The New Water Connection Process

• Survey and planning — we inspect your site, advise on the optimal connection point and pipe route, and determine the correct pipe size for your needs.
• Thames Water application — we submit your application to Thames Water Developer Services on your behalf, including the point of entry drawing and water fittings table.
• Supply pipe installation — we install the new MDPE supply pipe from your property boundary to your
  internal stop valve using trenchless moling where possible.
• Certification — we issue a Certificate of Works Completed certifying compliance with the Water
  Regulations, which is submitted to Thames Water Developer Services.
• Thames Water connection — Thames Water schedules and completes the final connection to their water main. We re-attend on the connection date to coordinate the final pipework connections.

Pipe Sizing For New Connections

Thames Water and Developer Services specify the minimum pipe size for new connections based on property type and water demand. Standard domestic connections use 25mm MDPE pipe; larger properties, HMOs or commercial premises may require 32mm or larger. We calculate the correct size as part of the application process.

Shared Supply Separation

Many older London properties are on a shared supply pipe — one pipe serving two or more properties. This creates problems: if one property's supply fails, all are affected, and liability for maintenance is shared. A new independent connection resolves this permanently. We carry out supply separations regularly and can manage the full Thames Water application process.

How Much Does a New Water Supply Connection Cost?

There are two separate charges. Thames Water charge for the connection from their main to your boundary, and they quote this directly when you apply through Developer Services. We charge for the private supply pipe on your side of the boundary.

For a standard house with a 25mm supply, our recent quotes for laying a new pipe from the meter to the house have been £1,600 to £1,650 plus VAT. That includes a new stopcock and valves, full reinstatement of the ground and the WIAPS compliance certificate. Longer runs, larger pipe sizes, hard surfaces and commercial buildings cost more. We give you a fixed price after a free survey.

What Happens on the Day

1. We mark out the route and protect floors, paths and planting.
2. We dig a small pit at each end and mole between them. Where existing cables and pipes make moling unsafe, we dig by hand instead.
3. New MDPE pipe is laid at 750mm deep, the minimum depth the Water Regulations require.
4. Inside, we fit a new stopcock, drain-off valve and check valve, then connect and pressure test the supply.
5. Every hole is backfilled and the surface reinstated, and you receive your WIAPS certificate.

Most domestic installations take a single day on site. Thames Water then make the live connection on their scheduled date, and we return to complete the final connection.

Related Services

• Impact moling: lay your new supply without digging a trench
• Lead pipe replacement: replace an old lead supply at the same time
• Water supply pipe replacement: upgrade an existing undersized supply