New Water Supply Connection London — Thames Water Approved Contractors
Whether you're building a new property, converting an existing one, or need a separate supply for an extension or annexe, JD Leak Detection provide complete new water supply connection services across London. We're approved contractors working within Thames Water's Developer Services framework, and we manage the full process from application through to final connection.
Looking for New Water Supply Connection in London?
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 Seperation
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.
The installation work on your property can typically be completed in one to two days. However, the Thames
Water application and approval process takes longer — usually 4-8 weeks from application to connection date.
We advise starting the process early in your project timeline.
Who pays for the connection from the mains
Thames Water charge for the connection from their water main to your boundary. Costs vary by connection
type and location — Developer Services will provide a quote when you apply. You pay for the supply pipe
installation on your property, which we carry out.
Can I have a new connection if I currently have a shared supply
Yes. Moving from a shared supply to an independent connection requires a new connection application
through Thames Water Developer Services. We manage this process regularly and can advise on the most
cost-effective approach for your situation.
