London External Moling Water Main Repairs

Call Flow EP today on 07929 433520 to get a free quote on all our London water repair services!

London & South East

24/7 Emergency Callouts

Water Safe Approved

External Plumbing & Moling

Water Main Replacement Experts in London

Flow External Plumbing London is a specialist external plumbing and moling contractor covering Greater London, Hertfordshire and Essex. We focus on private water supply pipes — repairs, replacements and lead service renewals.

Our London-based engineers handle every stage in-house, from the initial survey and quotation through to the final connection and reinstatement. That keeps responsibility with one team and lets us maintain the standard of workmanship we promise.

Wherever ground conditions allow, we use impact moling and trenchless techniques instead of long trenches. This protects gardens, driveways and patios, reduces disruption and is often quicker and more cost-effective than conventional excavation.

We also provide leak detection, drainage repairs, mains laying and diversions, and 24/7 emergency callouts. Whatever the job, the aim is the same: a lasting repair, a tidy site and clear communication from start to finish.

Impact moling explained — Flow EP external plumbing in London

Accredited & certified

WaterSafe Trusted & Certified

Flow External Plumbing London are Water Board approved (Water Safe), have an impeccable safety record and carry full public liability insurance. Our workforce is fully trained, vastly experienced and used to working closely with our clients to achieve the highest levels of satisfaction.

Water Safe

Water Board Approved
Fully Insured

Public Liability Cover
Experienced Team

Fully Trained Engineers
24/7 Available

Emergency Callouts

What Are Some of the Benefits of Our Services

Why External Impact Moling?

Impact Moling is a cost effective and environmentally friendly solution for many underground installation projects. Instead of digging trenches to lay pipes, ducts and cables, Flow External Plumbing London use a technique called Moling, which, uses a smaller footprint with no need for deep excavations and operates through various ground types, but not all.

Restore High Water Pressure

With washing machines, power showers and central heating systems needing water, old supplies (often Lead) do not provide an adequate flow. A new 25mm or greater pipe gives increased pressure from your taps.

No Unsightly Ground Disruption

Most excavations require no more than 1 metre square and 1 metre deep to receive the mole. The mole burrows discreetly under gardens, patios and driveways — far quicker and more cost-effective than traditional trenching.

Expert Moling Team Available 24/7

Our team have years of moling experience. You will always get a professional service whether it's a lead pipe repair, replacement, or water supply upgrade due to low water pressure — at a moment's notice.

Moling & Drilling Specialists

Our moling technology enables us to solve your water supply problems with the minimum of fuss. We can perform water pipe replacements without digging long trenches, lifting driveways or disturbing patios.

Value For Money

Our philosophy is simple: the right job, at the right price, at a time that's right for you. Guaranteed, reliable service from polite, friendly and competent engineers. Free site inspections available.

Energy Savings

Improved water flow can save you money — better delivery to water-dependent appliances reduces energy costs. Replacing a lead or steel supply can increase your water flow by up to 60%.

London External Moling Experts

Our External Plumbing Services

Comprehensive external plumbing and moling services delivered with precision across London, Essex, Surrey, Hertfordshire, and Kent.

London External Moling & Trenchless Installations

Impact Moling is a technique in which a pneumatic piercing tool is used to create a bore hole. The ground is compacted and displaced rather than excavated and removed, therefore disruption and reinstatement are minimal. Impact Moling is the simplest and least expensive trenchless technology installation method.

London Lead Mains Replacement & Lead Mains Installations

Save time and money on water main replacements with the latest trenchless techniques from Flow External Plumbing. Our state-of-the-art moling equipment can bore accurate, efficient channels for new pipe work without the need for large scale excavation.

London Water Pipe Repairs & Replacements

Our water mains replacement starts from the stop tap at the boundary of your property up to the connection inside your house, giving you a single, seamless water supply replacement that has superior integrity and flexibility, leaving it less prone to splits and cracks with none of the risks of lead contamination.

London Drainage Repair & Drainage Services

When it comes to the designing and installation of drainage systems, we have plenty of experience working in both the private and public sectors. As well as adhering to all of the relevant health and safety regulations, our team works hard to ensure the whole process goes smoothly for our clients.

London Leaking Pipe Repair & Leak Detection

Leaking or burst pipes can form to create problems, which can turn into a disaster if not taken care of quickly. We offer our clients a priority service whenever they find themselves dealing with this kind of problem. If you are living in London, Essex, Surrey, Hertfordshire, or Kent, you can call us for pipe replacement work.

London Mains Laying & Mains Diversions

Flow External Plumbing can supply and install all types and sizes of water main. In addition to large scale mains laying services we also provide a bespoke design service for smaller projects, such as lead renewal, meter installations and diversions. So no job is too big or too small.

This is just an array of services, need different moling or repair help?

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Flow External Plumbing London case study - Hampstead Garden Suburb

Delivered

On Time & Within Budget

Onsite Case Study

Water Mains Lead Replacement In London

Project: Hampstead Garden Suburb Conservation Area

As with this job we aim to provide a professional and detailed approach to each individual project.

As this was a conservation area we needed multiple meetings with Thames water, The Hamstead Garden Suburb trust and the Hamstead Garden Suburb residents association and architects, providing detailed drawings, method statement and risk assessment.

The end result was the project being delivered on time and within budget.

Multi-Stakeholder

Coordination

Detailed

Method Statement

Conservation

Area Approved

Lead Free Replacement Scheme

Lead pipe replacement scheme application process

If your home has a lead water supply pipe, you may be able to replace it under your water company's lead replacement scheme. The scheme is run by your water supplier — Flow EP can manage the private-side replacement and provide the certification they need.

01
Check your supplier & eligibility

Find out whether Thames Water or Affinity Water supplies your property. Most schemes are aimed at homes built before 1970 with a confirmed lead supply pipe, where the owner is responsible for the private pipework.
02
Submit your application

Apply directly through your water company's lead replacement scheme using the links below. They will confirm the conditions that apply to your property before any work starts.
03
Appoint an approved contractor

Choose a WaterSafe-approved plumber to replace the private-side lead pipe to the scheme's specification. Flow EP can survey the supply, provide a quote and complete the replacement.
04
Inspection & connection

Your water company inspects or accepts certification for the private-side work, then replaces its section of lead service pipe and arranges reinstatement.

Application forms

Apply through your water company

Choose your water supplier to open their lead pipe replacement application.

Thames Water

Lead pipe replacement scheme application

Open Thames Water application

Affinity Water

Lead pipe replacement programme application

Open Affinity Water application

Not sure which scheme applies to you? We can help.

Ask Flow EP about your application Call 07929 433520

Scheme eligibility, availability, coverage and timescales vary by water company and can change. Always confirm the current terms with your water supplier before appointing a contractor or starting work.

We're Available 24 Hours a Day

Request an appointment and our team will get back to you as soon as possible. Emergency callouts available across London, Hertfordshire and Essex.

Call Now Request Appointment

Frequently Asked External Moling Questions

Frequently Asked Questions

Can't find the answer you're looking for? Our team is available 24/7 to answer your questions.

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We cover London, Hertfordshire, and Essex for all our plumbing and external moling services. We have engineers positioned across the region to ensure rapid response times.

External moling (also known as impact moling) is a trenchless technology used to install pipes, ducts, and cables underground without the need for open-cut excavation. A pneumatic mole is driven through the soil, creating a borehole through which pipes can be pulled. This method minimises disruption to driveways, gardens, and landscaping.

Yes, we provide 24/7 emergency callouts for burst pipes, major leaks, and water mains failures. Our rapid response team can typically be on-site within 2-4 hours for urgent situations across London and the surrounding areas.

We use a combination of acoustic listening devices, tracer gas detection, thermal imaging cameras, and correlation technology to pinpoint leaks with minimal disruption. This non-invasive approach saves time, money, and your landscaping.

Most standard domestic lead mains replacements can be completed within 1-2 days. We use moling techniques where possible, which minimises excavation and speeds up the process. We also handle all notifications to your water supplier.

Yes, we are fully insured and our engineers are qualified to the highest industry standards. We are members of relevant trade bodies and all our work is guaranteed. Certificates are available on request.

Costs vary depending on the length of pipework, ground conditions, and access. We provide free, no-obligation quotes after an initial survey. Contact us to arrange a site visit and we'll give you a transparent, fixed-price quotation.

Absolutely. We handle all notification and liaison with your local water supplier, including Thames Water, Affinity Water, and Essex & Suffolk Water. We submit all required paperwork and obtain necessary approvals on your behalf.

Client Testimonials

Mains Water Leak Repair London Reviews

5 out of 5 based on 8 reviews

"Dear Karl, May we take this opportunity to thank you for an excellent job. As you are aware the reason for the initial call was the stream of water pouring down our front driveway due to a broken stop-cock. After an initial phone call, you arrived the next day (at the agreed time) to assess the work. You explained that whilst replacing the broken stop-cock the fitting of a new water main to replace the original lead water main would be beneficial. You advised us of the cost at the time, which we thought was very reasonable. Within a week of the initial phone call the work was completed to a very high standard. Neighbours who saw the depth of the hole that you had to dig to get to the water main have commented that 'you wouldn't have known your drive had been dug up' as the block pavers were replaced to their original state (if not better)! As we have a pressurised water system the increase in water pressure due to the new water main is incredible. For these reasons, we would definitely recommend Flow External Plumbing London to anyone that requires your services."

Mr & Mrs P James

Barnet EN4

"I am writing to thank you for completing the excellent job carried out on Thursday in replacing the lead service pipe. I was delighted that you were able to install the new inlet pipe by using the moling technology, thus avoiding excavating more of my driveway than the original inspection hole. I appreciate the time and extra trouble you and your colleague took in ensuring there was no damage inside my home as you connected the internal services. Please use this letter as an introduction to other clients and rest assured that if I hear of family or friends facing similar problems with deteriorating lead pipes I will recommend your firm."

Mr M Griffin

Winchmore Hill N21

"I needed to have the old lead water main replaced with a new plastic pipe at my property. A neighbour introduced me to Flow. I found them to be incredibly efficient, from arriving on time to give us a quote. On the day the work was to be carried out, they arrived promptly with a courtesy call to notify me of their arrival time. The work was carried out with the utmost efficiency. The finished job was of an excellent standard, and I was left with no mess at all. I would recommend this company to anyone considering any external plumbing."

Mr Boorman

London N19

"Karl was well worth waiting for. He replaced the lead pipe between the house and water mains. It was a big job - a distance of almost 30 metres through hard ground the entire route and took almost two days. His work ethic, skill and attention to detail are impressive. He promised to make good all the excavations that were required for the project and the results were fantastic. He is delightful too! It does not get better than this. Thank you Karl."

N/A

Anon

London N21

"Karl and his team did an exceptional job for us. We had an incredibly complex project, coming off a shared supply and replacing a lead pipe for a first and second floor flat in an old Victorian house. We had consulted a long list of plumbers, and Karl's solution stood out by far, not only was it the best approach from a flow rate/weathering perspective, but it involved minimal disruption to the garden and neighbours and came in at a reasonable cost. Something which was unimaginable at the start of this process. He was also a delight to work with, efficient, knowledgeable, and respectful throughout. I could not recommend him and his team more highly."

Anina

London N6

"Absolutely outstanding service! He carried out the moling work for us and did an exceptional job from start to finish. The work was completed to a very high standard, and everything was left incredibly clean and tidy. He was trustworthy, professional, and extremely knowledgeable. He took the time to explain the entire process clearly, which gave us complete confidence in the work being carried out. I couldn't be happier with the result and would highly recommend him to anyone looking for a reliable and skilled professional. Five stars!"

Shyam

London

"Karl is excellent. Knowledgeable, friendly and reasonable prices. He was the only person we reached out to who came for a site visit and explained everything clearly. Recommended."

Mario's

London N21

"We're so pleased we found Karl. Having been let down by others in the field, he was instantly an assuring voice. His able assistant Louis did an efficient site visit and a week later Karl was on site to replace the lead pipe beneath our drive. He was clearly experienced and enthusiastic, and pleasant to have around. As promised he was done in a day and barely left a trace. I wouldn't hesitate to recommend his services."

Alex

London