Extend or modify pipework and connect an appliance to it

⭐ Introduction

Extending or modifying pipework and connecting an appliance to it is a common job in many UK homes. Whether you are adding a new washing machine, replacing a boiler, or fitting a new kitchen appliance, sometimes the existing plumbing doesn’t quite match what’s needed. In such cases, pipework needs to be altered or extended so that your appliance works safely and efficiently.

This job is essential to ensure correct water supply and drainage, prevent leaks, and meet UK safety and building standards. It is often undertaken when renovating rooms, updating appliances, or improving home utilities. Understanding what’s involved helps you plan better and get the job done right.

🔧 What the job involves

At its simplest, this work means changing your current pipework layout and connecting it to your new or replacement appliance. Typically, a qualified plumber will:

• Isolate the water supply to avoid leaks and water damage.
• Remove or reroute existing pipes if needed.
• Extend pipework using suitable materials (usually copper, plastic, or flexible tubing).
• Fit the correct valves, connectors, and fittings ensuring everything is secure and watertight.
• Attach and connect the new appliance to the pipework, testing for proper function.
• Safely dispose of any waste materials.

Since plumbing affects your home’s water system and sometimes gas supply (if connected to boilers or gas appliances), the work must comply with UK regulations, including Water Supply (Water Fittings) Regulations and, where relevant, Gas Safe requirements. Occasionally, Building Regulations confirmation or a Part P electrician may be needed if electrical connections or modifications overlap.

📝 Step-by-step from booking to completion

1. Initial enquiry: Contact a reputable plumber to explain your needs and arrange a visit.
2. Survey and quote: The plumber visits to assess existing pipework and appliance requirements, then provides a written estimate.
3. Scheduling: Agree on a date for the work that suits your timetable.
4. Preparation: You clear the work area to give the plumber easy access.
5. Work day: The plumber arrives, isolates water/gas where needed, modifies/extents pipework, connects the appliance, and tests all connections carefully.
6. Completion: They clean up and demonstrate the new setup to you.
7. Paperwork: The plumber provides you with any necessary certification (e.g., Gas Safe certificate for gas appliance work) and instructions for use and maintenance.

💷 Main costs to expect

• Labour: Typical hourly rate £40–£60, depending on region and plumber’s experience.
• Materials and parts: Pipes, fittings, valves may cost £20–£100 or more depending on complexity.
• Appliance connectors: Flexible hoses or tailored connectors usually between £10–£30.
• Disposal: Removing old pipework or appliances can add £20–£50.
• Certification: Gas work certification (Gas Safe) usually included by qualified plumbers; written certification or Building Regulation notification may incur a small fee (£30–£50).

Simple example:

• Labour: 3 hours at £50/hour = £150
• Materials: £40
• Disposal: £30
• Certification: included

Total: approximately £220

📊 What affects the price

• Access to pipework (behind walls or under floors is harder and slower).
• Complexity of modification (simple pipe extension versus extensive rerouting).
• Type and material of pipe (copper is more expensive than plastic).
• Necessity of gas connections (requires Gas Safe plumber).
• Regulations requiring certification or inspection.
• Additional remedial work needed (e.g., repairing wall finishes).
• Location in the UK (London and SE tend to be pricier).
• Urgency or timing of the job (emergency or out-of-hours work costs more).

⏱ How long does it take?

• Simple pipe extension and appliance connection: 2–4 hours.
• More complex rerouting or multiple appliance connections: up to 1–2 days.
• If gas appliance connections are involved, allow extra time for safety checks and certification.

🏠 Can you DIY it?

While minor plumbing tasks may be manageable for confident DIYers (like fitting flexible hoses), extending or modifying pipework that involves cutting into existing pipes, jointing, or connecting gas appliances should be left to professionals. Incorrect work can cause leaks, water damage, or dangerous gas leaks.

Remember:

• Gas work must be done by Gas Safe registered engineers.
• Water connection modifications should follow Water Supply (Water Fittings) Regulations.
• Building Regulations approval may be required.
• DIY mistakes can invalidate appliance warranties and home insurance.

💰 Typical UK price range

Expect to pay roughly £150 to £600 depending on job size and complexity. This is a broad guide and includes VAT at the standard 20% rate. Always get a written quote tailored to your situation.

✅ Handy tips before you start

• Prepare the area by moving furniture and clearing access to pipework and appliance spaces.
• Keep all paperwork, invoices, and certificates safely—they may be important for warranty purposes or future house sales.
• Ask your plumber for care advice and servicing schedules, especially for gas and heating appliances.
• Confirm with your installer if any Building Regulations notification or inspection will be carried out on your behalf.
• If unsure, always seek professional advice rather than risk faulty installations or breaches of regulations.