Cascadia Water
01895 624600

New Water Main Installation & Self-Lay Connections

Cascadia Water are specialists in new water main installation and self-lay connections for new-build properties and commercial developments across London and the Home Counties. We work with homeowners, developers, and construction teams to deliver compliant, efficient, and cost-effective new connections to the mains water supply.

Our WaterSafe-approved engineers manage the full process, from planning and coordination with local water authorities through to installation, testing, and final connection, ensuring your project is completed safely, efficiently, and with minimal disruption.

For repairs or upgrades to existing water mains, see our Water Main Connections, Upgrades & Repairs page.

Why Choose Cascadia Water for New Water Main Installations?

Installing a new water main is a critical step in any new build or development project. Choosing the right contractor ensures your water supply is safe, reliable, and fully compliant with local regulations and water authority requirements. Cascadia Water provides:

  • Fully qualified, WaterSafe-approved engineers
  • Experience managing permits and local authority requirements
  • Minimal surface disruption using trenchless installation methods
  • Full project management from initial consultation through to commissioning
Trenchless Pipe Moling

Our Installation Process

We manage every stage of a new water main connection, including:

  1. Survey and Planning – assessing site conditions and designing a compliant connection solution
  2. Permitting & Liaison – coordinating with local water authorities and utility providers
  3. Installation – installing new pipework using the most appropriate method for the site, including trenchless pipe moling where suitable
  4. Testing & Commissioning – testing the installation and commissioning the new connection to ensure it is safe and fully operational
Water Main Installation Process
Self-Lay Water Connection

Self-Lay Water Connections for Developers

For developers seeking a compliant and efficient route to connecting new properties to the mains water supply, Cascadia Water provides a professional self-lay water connection service. This approach offers greater control over project timescales and costs compared to traditional connection routes.

We manage the full self-lay process, from initial consultation and design through to installation, testing, and final approval with the relevant water authority, ensuring each connection meets current standards and regulatory requirements.

Trenchless Pipe Moling (Installation Method)

For many new water main installations, Cascadia Water uses trenchless pipe moling to install pipework without the need for continuous open trenches. This method reduces reinstatement costs and minimises disruption, making it particularly suitable for residential driveways, landscaped areas, and busy commercial sites.

Trenchless Moling

Experience You Can Trust

Cascadia Water has delivered new water main installations and connections for a wide range of clients – from heritage properties to commercial sites and schools.

  • Windsor Castle – installed a new water main to serve Cambridge Lodge using trenchless moling technology, protecting landscaped gardens and historical features.
  • School Developments in London & the Home Counties – delivering water and drainage connections for new builds and refurbishments under tight deadlines.
  • Access Self Storage – providing long-term drainage and water solutions across multiple sites, ensuring uninterrupted operations.

See more of our work in our case studies.

Areas We Cover

We operate across London and the surrounding counties, including: Kent, Surrey, Essex, Hertfordshire, Buckinghamshire and Bedfordshire.

Frequently Asked Questions

  • Do I need planning permission for a new water main connection?

    • Typically, you don’t need planning permission to connect to an existing water main. However, new installations often require coordination with your local water authority and may need permits. We manage this process for you.

  • What is a self-lay water main connection?

    • A self-lay connection allows developers or property owners to arrange their own installation of a new water main, rather than using the local water company. This can reduce costs and speed up projects. Cascadia Water is an accredited self-lay provider, meaning we can install the main to industry standards and hand it over to the local water company for adoption.

  • Can you replace lead pipes as part of a new installation?

    • Yes. If your property still uses lead pipework, we can upgrade your supply as part of the installation, ensuring a safer and more reliable water supply.

  • How long does installation take?

    • The timescale depends on site conditions and whether permits are required, but most projects can be completed within a few days once approvals are in place.

Working with Cascadia Water?

When you partner with Cascadia Water, you'll collaborate with a team of talented local experts in drainage and watermain services. Our team is experienced, skilled, and committed to delivering top-notch work and exceptional customer service. When it comes to installation or resolving issues with your permanent water supply or drainage, Cascadia Water are the specialists in the field.

Situated in Ruislip, on the outskirts of Central London, we are a family-run watermain and drainage firm dedicated to providing outstanding service to our customers.

Expertise

With over 30 years of industry experience, Cascadia Water brings extensive expertise in diagnosing and resolving both common and complex drainage and water main issues.

Reliability

As an accredited expert in drainage and water mains in the water industry, working with Cascadia Water guarantees efficient problem-solving within budget..

Compliance & Safety

With credentials including SafeContractor, WaterSafe, SMAS, Constructionline, and the Water Industry Approved Plumbing Scheme (WIAPS), when working with Cascadia Water, Compliance and Safety will always be strictly adhered to.

Upfront Communication

Whatever drainage or watermain challenge you’re facing, at Cascadia Water, we always provide upfront and honest communication to help to drive an issue forward.

New Water Main Installation & Self-Lay Connection Experts

  • New Water Main Installation
  • Self-Lay Water Connections
  • Trenchless Pipe Moling
  • Lead Pipe Replacement
  • Water Supply Connections

Get in Touch

Get a free no-obligation quote, complete the form below and our expert team will get back to you as soon as possible.

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