Selling a House with Lead Pipes

Lead pipes are one of the most common issues that surfaces during property sales involving older homes in England and Wales. If your house was built before 1970, there is a significant chance that some or all of the internal water supply pipework is made of lead. The water supply pipe connecting your home to the water main may also be lead.

Lead in drinking water is a well-established health risk. The World Health Organisation (WHO) states that there is no known safe level of lead exposure, and the NHS advises that even low levels can affect brain development in children and cause health problems in adults over time. For sellers, the presence of lead pipes raises questions about disclosure, valuation, and whether replacement is necessary before putting the property on the market.

This guide covers everything you need to know: the history of lead pipes in UK homes, how to identify them, what the law requires you to disclose, the costs of replacement, water company schemes, and how to keep your sale on track.

A brief history of lead pipes in UK homes

Lead was the material of choice for domestic water supply pipes in the UK from the Victorian era through to the late 1960s. The word "plumbing" itself derives from the Latin plumbum, meaning lead. Lead pipes were favoured because the metal is soft, easy to bend, resistant to corrosion, and long-lasting.

The use of lead for new water supply pipes was effectively discontinued in the UK from the 1970s onwards, as the health risks of lead exposure became better understood. The Water Supply (Water Fittings) Regulations 1999 formally prohibited the use of lead in new plumbing installations. However, millions of properties built before 1970 still have original lead pipework in place.

According to Water UK, the industry body representing water companies in England and Wales, there are still an estimated 7 to 10 million lead communication pipes connecting properties to the water mains network across the UK, and a similar number of lead supply pipes running from the boundary to the property itself. Many of these are in areas with older housing stock, particularly in northern England, the Midlands, Scotland, and Wales.

Health risks: why lead pipes matter

Lead is a toxic metal that accumulates in the body over time. When water sits in lead pipes, small amounts of lead dissolve into the water. The amount depends on several factors, including the age of the pipes, the acidity of the water, how long the water has been standing, and the temperature.

The key health guidance comes from several authoritative sources:

• World Health Organisation (WHO) — The WHO states that there is no known safe level of lead exposure. Children, infants, and pregnant women are most vulnerable. Lead exposure can impair brain development, reduce IQ, and cause behavioural problems in children.
• NHS — The NHS advises that lead in drinking water is a health risk, particularly for young children and pregnant women. It recommends running the tap for a short time before drinking if the water has been standing in the pipes, as a practical measure to reduce lead exposure.
• Drinking Water Inspectorate (DWI) — The DWI enforces the legal limit for lead in drinking water in England and Wales, currently set at 10 micrograms per litre (10μg/l) under the Water Supply (Water Quality) Regulations 2016. The DWI has indicated that this limit may be tightened to 5μg/l in the future, aligning with the revised EU Drinking Water Directive.

For sellers, the health risk associated with lead pipes is significant because it directly affects how buyers, surveyors, and mortgage lenders view the property. Even if your water currently tests below the legal limit, the presence of lead pipes is a known risk factor that must be disclosed.

How to identify lead pipes in your property

Before you list your property, it is worth checking whether your pipework is lead. You can do this yourself without specialist equipment.

Visual inspection

Lead pipes are dull grey in colour and have a characteristic appearance. They are soft enough to scratch with a coin or key — if you scratch the surface and see a shiny silver mark underneath, the pipe is likely lead. Lead pipes also have rounded, bulbous joints where they connect, rather than the neat solder joints found on copper pipes.

Where to check

• Under the kitchen sink — Follow the pipe from the tap back towards the wall. This is the most accessible point to inspect the internal supply pipe.
• At the internal stopcock — Usually found under the kitchen sink or in a downstairs cupboard. The pipe entering the stopcock from outside is the supply pipe.
• At the external stopcock — Lift the small metal cover in the pavement outside your property. The pipe visible here is the communication pipe, which is the water company's responsibility.
• In the cellar or under floorboards — If your property has a cellar, the supply pipe may be visible where it enters through the wall.

Water testing

If you cannot identify the pipe material visually, or if you want to know the actual lead levels in your water, you can request a water test. Most water companies will carry out a free test on request. Alternatively, you can send a sample to an accredited private laboratory. The test will tell you the concentration of lead in your water in micrograms per litre, which you can compare against the legal limit of 10μg/l.

Replacement costs and who pays

Understanding who is responsible for which section of pipework is essential for managing costs and expectations during a sale.

The three sections of pipework

The total cost of replacing all lead pipework within a typical three-bedroom house ranges from £1,500 to £4,000 or more, depending on the property's size, the complexity of the plumbing layout, and the accessibility of the pipework. Properties with solid floors, multiple storeys, or pipework routed through walls will generally be at the higher end of this range. For a broader view of unexpected expenses when selling, see our guide on hidden costs of selling a house.

Water company lead replacement schemes

Most water companies in England and Wales have active programmes to replace lead communication pipes. These schemes vary in scope and eligibility, but the general position is as follows:

• Communication pipe replacement — Water companies will typically replace the lead communication pipe from the main to your boundary free of charge when they become aware that it is lead. This may happen as part of a planned programme, in response to a customer request, or when a water sample shows elevated lead levels.
• Supply pipe contribution — Some water companies will contribute towards or fully fund the replacement of the customer's supply pipe from the boundary to the internal stopcock. This is usually conditional on the homeowner also replacing the internal lead pipework, so that the entire lead pathway is removed in one go.
• Coordinated replacement — The most effective approach is a coordinated replacement, where the water company replaces the communication pipe at the same time as the homeowner replaces the supply pipe and internal pipework. This eliminates the entire lead pathway and avoids the situation where replacing only one section still leaves lead in contact with the drinking water.

Contact your local water company to find out what support is available. The Water Regulations Advisory Scheme (WRAS) and Water UK can help you identify your regional supplier if you are unsure.

Your disclosure obligations as a seller

When you sell a property in England or Wales, your solicitor will ask you to complete the TA6 Property Information Form. This form covers a wide range of questions about the condition and history of your property. If you know or suspect that your property has lead pipes, you must disclose this.

Your disclosure obligations are governed by several legal frameworks:

• Consumer Protection from Unfair Trading Regulations 2008 (CPRs) — These regulations make it an offence to mislead consumers by withholding material information. The presence of lead pipes is material information because it affects the quality of the water supply and may require remediation at the buyer's expense.
• Misrepresentation Act 1967 — If you make a false or misleading statement about the property (including omitting information you should have disclosed), the buyer may have a claim against you after completion.
• Common law duty of honesty — While English property law follows the principle of caveat emptor (buyer beware), sellers must not actively conceal defects or give false answers to direct questions.

For a comprehensive overview of your obligations, see our guide on what to disclose when selling a property.

Impact on surveys and valuations

Lead pipes are likely to be noted in the buyer's survey, particularly if the surveyor carries out a RICS Home Survey Level 2 (HomeBuyer Report) or Level 3 (Building Survey). To understand the different survey types and what they cover, see our guide on preparing for a home buyer survey.

A surveyor will typically:

• Note the presence of lead pipework where it is visible.
• Recommend a water test if lead pipes are identified.
• Advise the buyer to obtain a quote for replacement.
• Flag the issue as a condition rating of 2 (defects that need attention but are not serious or urgent) or 3 (defects that are serious or urgent) depending on the circumstances.

Once the survey flags lead pipes, the buyer may use this as a basis for renegotiation after the survey. In practice, the negotiation typically centres on the estimated replacement cost. Buyers who receive a survey flagging lead pipes commonly request a price reduction in the range of £1,500 to £4,000, reflecting the cost of replacement work.

If you want to prevent this renegotiation, you have two options: replace the pipes before listing, or disclose the issue upfront and price accordingly. Either approach is preferable to having the buyer discover the issue through their survey and feel that the information was withheld.

Water filters as an interim measure

If replacing lead pipes before the sale is not practical — for example, due to cost, timing, or the complexity of the work — a point-of-use water filter can reduce lead levels in drinking water as an interim measure.

Filters certified for lead removal include:

• Reverse osmosis systems — These remove up to 99% of lead and other contaminants. They are installed under the kitchen sink and produce filtered water through a separate tap. Typical cost: £150 to £400.
• Activated carbon filters — Some activated carbon filters are rated for lead reduction. Check that the filter is certified to NSF/ANSI Standard 53 for lead removal. Typical cost: £30 to £100 for the unit, plus replacement cartridges.
• Jug filters — Standard jug filters (such as Brita) are not certified for lead removal and should not be relied upon for this purpose.

The Drinking Water Inspectorate advises that filtration is not a long-term substitute for replacing lead pipework. Filters require regular maintenance and cartridge replacement to remain effective. For the purposes of a property sale, a buyer's solicitor is unlikely to accept a water filter as a permanent solution — they will expect a plan for full pipe replacement.

Practical steps for sellers

If you know or suspect that your property has lead pipes, the following steps will help you manage the issue and keep your sale on track.

1. Identify the extent of the lead pipework

Carry out a visual inspection of the pipework under the kitchen sink, at the internal stopcock, and at any other accessible points. If you are unsure, ask a plumber to confirm the pipe material. This costs very little and gives you a clear picture of what you are dealing with.

2. Get a water test

Contact your water company and request a free water test, or use an accredited private laboratory. The results will tell you whether lead levels are within the legal limit. If they are, you have a strong piece of evidence to reassure the buyer.

3. Contact your water company about their lead scheme

Ask your water company what support they offer for lead pipe replacement. If they are willing to replace the communication pipe and contribute to the supply pipe, this can significantly reduce your out-of-pocket costs.

4. Consider replacing the pipes before listing

Replacing the internal lead pipework before listing removes the issue entirely and prevents it from becoming a negotiation point. If the cost is manageable (£1,500 to £4,000 for most properties), the investment is often worthwhile, particularly in a competitive market where buyers have other options.

5. Disclose honestly on the TA6 form

Whether or not you replace the pipes, disclose what you know on the TA6 form. If you have replaced them, provide the plumber's invoice, any certificates, and the results of a post-replacement water test. If lead pipes remain, disclose their presence and provide your water test results. Transparency prevents the kind of late-stage surprises that cause sales to collapse.

Sources and further reading

• Water UK — Industry body for water companies in England and Wales, with information on lead pipe replacement programmes: water.org.uk
• Drinking Water Inspectorate (DWI) — Regulator for drinking water quality in England and Wales, including guidance on lead in drinking water: dwi.gov.uk
• NHS — Guidance on the health risks of lead in drinking water, particularly for children and pregnant women: nhs.uk
• World Health Organisation (WHO) — International guidance on lead exposure and health impacts, including the position that there is no safe level of lead exposure: who.int
• Water Regulations Advisory Scheme (WRAS) — Information on plumbing regulations and approved products for water supply installations: wras.co.uk
• Water Supply (Water Quality) Regulations 2016 — The legal framework for drinking water quality standards in England, including the 10μg/l limit for lead: legislation.gov.uk
• Consumer Protection from Unfair Trading Regulations 2008 — Legislation on material information disclosure in property transactions: legislation.gov.uk
• Water Supply (Water Fittings) Regulations 1999 — Regulations prohibiting the use of lead in new plumbing installations: legislation.gov.uk

Related guides

• Selling a House with Planning Permission Refused

Frequently asked questions