Plumbing Installation Services in London

Whether you’re fitting a brand-new bathroom, upgrading your water heater, or laying pipework in a new build, getting it right first time matters. A poorly installed system causes leaks, inefficiency, and costly repairs down the line. At Catalyst Home Services, our qualified plumbers handle every type of plumbing installation — cleanly, correctly, and to the standard your property deserves.

We work across London for homeowners, landlords, property developers, and businesses. All work is carried out by qualified, insured engineers with full transparency on pricing from the very start.

Ready to get your installation underway? Book a Plumber online or call us on +44 7400 265421.

What Do Our Plumbing Installation Services Cover?

Installation services are any job that involves fitting something new — as opposed to repairing something that already exists. This could be as small as fitting a new tap or as large as plumbing an entire new-build development from first fix to completion.

Our installation team handles four core areas:

Each of these services is described in detail below, with its own dedicated page for deeper information.

Water Heater Installation

Hot water is not a luxury — it’s something every household and business in London depends on every single day. Whether your existing unit has failed, you’re upgrading to a more efficient system, or you’re fitting out a new property, our engineers can advise on the right solution and carry out the installation to a high standard.

We install:

  • Combination (combi) boilers
  • System boilers with hot water cylinders
  • Unvented (pressurised) hot water cylinders
  • Vented hot water tanks
  • Electric water heaters and immersion heaters
  • Megaflo and comparable unvented systems

Getting the right type and size of water heater is important — an undersized system means you run out of hot water at peak times, while an oversized one wastes energy and money. Our team will assess your property, your usage, and your budget before recommending anything.

Once installed, we can also cover your new system under our Boiler & Water Heater Service plan, keeping it running efficiently year after year.

Find out more about our Water Heater Installation service →

Bathroom Fitting

A new bathroom is one of the most significant improvements you can make to a home. It adds value, improves daily life, and — when done properly — lasts for decades. At Catalyst Home Services, we provide complete bathroom fitting in London, from stripping out the old suite to handing you the keys to your new room.

Our bathroom fitting service includes:

  • Full bathroom strip-out and disposal of old materials
  • Bath, shower tray, and shower enclosure installation
  • Basin and vanity unit fitting
  • Toilet installation and connection
  • Underfloor heating connections (plumbing side)
  • Concealed and exposed pipework routing
  • Connection to existing or upgraded waste and supply lines

We work to your design and choice of fixtures, or we can help you spec the right products for your budget and space.

If you’re replacing a single toilet rather than doing a full bathroom, our standalone Toilet Repair & Replacement service may be all you need.

Find out more about our Bathroom Fitting service →

New Build Plumbing

If you’re building a new home, converting a property, or constructing an extension, plumbing needs to be planned and installed at the right stage — and it needs to comply with current UK Building Regulations. Getting this wrong means costly rework, failed inspections, and delays to your build.

Our new build plumbing team works with self-builders, developers, architects, and contractors across London. We understand build programmes and we coordinate our work around other trades to keep things moving.

New build plumbing covers:

  • First fix plumbing — running copper or plastic pipework before walls are boarded
  • Second fix plumbing — connecting appliances, fixtures, and fittings once decoration is complete
  • Soil and waste pipe routing
  • Cold water mains supply and hot water distribution
  • Boiler and cylinder positioning and connections
  • Underfloor heating pipework (wet systems)
  • Pressure testing and sign-off documentation

For businesses and commercial developments, our Commercial Plumbing team handles larger-scale projects with the same level of professionalism. And for long-term protection of your new system once the build is complete, our PPM (Planned Preventive Maintenance) contract is specifically designed for landlords and developers.

Find out more about our New Build Plumbing service →

Pipe Replacement & Relining

Pipes don’t last forever. Most UK homes built before the 1980s have copper or even lead pipework that has been in service for decades. Older pipes corrode, scale up internally, develop pinhole leaks, and lose efficiency — and at some point, patching them up is no longer the most cost-effective option.

Pipe replacement is the process of removing old pipework and installing new runs. Pipe relining is a less invasive alternative where a new internal lining is inserted into an existing pipe, sealing cracks and corrosion without excavation. Our team will assess your system and recommend the most practical and cost-effective solution.

Signs your pipes may need replacing:

  • Persistent low water pressure despite no apparent blockages
  • Discoloured or rust-coloured water
  • Recurring leaks in the same area
  • Pipes that are visibly corroded or scaled
  • Property over 40 years old with original pipework

If you’ve been dealing with recurring Water Pressure Issues or repeated Burst Pipe Repair callouts, a full pipe replacement could end the cycle of problems for good.

Find out more about our Pipe Replacement & Relining service →

Why Professional Plumbing Installation Matters in the UK

It might be tempting to cut costs by using an unqualified fitter or attempting a DIY installation. For small jobs like changing a showerhead, this might be fine. But for anything that involves mains water connections, gas lines, unvented pressure systems, or Building Regulation compliance — it’s not worth the risk.

Here’s what can go wrong with poor installation:

  • Leaks inside walls and floors that go undetected until structural damage sets in
  • Invalidated home insurance — most policies require work on water heaters and boilers to be carried out by a qualified engineer
  • Building Regulation failures — particularly relevant for new builds and extensions, where sign-off is mandatory
  • Voided manufacturer warranties on appliances fitted incorrectly
  • Safety risks from incorrectly installed unvented pressure systems, which can fail catastrophically

Our engineers hold the relevant qualifications and certifications for every type of installation work we carry out. You can review our credentials on our Licences & Certifications page.

Who We Work With

Our installation services are used by a wide range of clients across London:

Homeowners — Upgrading bathrooms, replacing ageing water heaters, and improving their home’s plumbing infrastructure ahead of a sale or simply for comfort.

Private Landlords — Keeping rental properties compliant, modernising older bathrooms to attract better tenants, and replacing failing hot water systems. Our Residential AMC is particularly popular with landlords who want planned, predictable maintenance costs rather than reactive emergencies.

Property Developers & Self-Builders — First and second fix plumbing for new builds and conversions, with documentation suitable for Building Control sign-off.

Commercial Clients — Offices, restaurants, hotels, and retail premises needing compliant, professionally installed plumbing systems. See our Commercial AMC for ongoing cover.

Housing Associations & Estate Managers — Planned bathroom refurbishments and system upgrades across multiple units, managed efficiently with minimal disruption to residents.

How Our Installation Process Works

We keep things simple and straightforward from your first contact to the day the job is finished.

Step 1 — Initial consultation and survey We discuss your requirements by phone or arrange a site visit to assess the scope of work. For larger jobs like new build plumbing or full bathroom fits, a site survey is always recommended.

Step 2 — Detailed quote We provide a written, itemised quote with no hidden costs. You’ll know exactly what’s included before any work starts.

Step 3 — Scheduling We agree a start date that works for you. For bathroom installations and pipe replacements, we’ll give you a realistic timeline so you can plan accordingly.

Step 4 — Installation Our engineers arrive on time, work cleanly, and keep disruption to a minimum. We protect flooring and furniture during the job.

Step 5 — Testing and sign-off Every installation is tested before we leave — pressure tested, flow-checked, and inspected for compliance. You’ll receive documentation for warranty or insurance purposes where required.

Step 6 — Ongoing support We’re available for any follow-up questions, and all our installation work is covered by a workmanship guarantee. For long-term protection, explore our AMC Pricing & Packages.

Why Choose Catalyst Home Services for Your Installation?

Qualified, insured engineers Every member of our installation team holds the appropriate qualifications for the work they carry out — from City & Guilds plumbing credentials to Unvented Hot Water System (G3) certification. See our Licences & Certifications.

Transparent pricing — no surprises We quote clearly and stick to it. If anything unexpected comes up during the job, we tell you before we proceed. More on our approach on our Why Choose Us page.

London-wide coverage We work across all London boroughs. Check the Service Areas page to confirm we cover your postcode.

A team you can trust Our Reviews & Testimonials page reflects years of work across hundreds of London properties — from first-time buyers fitting their first new bathroom to developers running multi-unit projects.

Emergency support when you need it If something goes wrong during or shortly after an installation — or if an existing system fails and you need it sorted fast — our Emergency Plumbing team is available 24/7. Call the Emergency Line (24/7) any time.

Need Something Else Alongside Your Installation?

Plumbing jobs often uncover other issues — or present the perfect opportunity to tackle related work at the same time. Here are services our installation customers commonly combine:

  • Leak Detection & Repair — If we’re opening up walls or floors for a pipe replacement, it’s a good time to check for hidden leaks
  • Blocked Drain Clearance — New bathroom installations sometimes reveal slow or blocked waste lines
  • CCTV Drain Survey — Before any new build plumbing, a drain survey confirms your existing drainage can handle the extra load
  • Sewer Line Repair — Extensions and new builds often require connecting to or rerouting the main sewer
  • Residential Plumbing — General plumbing support for everything around the home
  • Boiler & Water Heater Service — After a water heater installation, keep it covered with an annual service

FAQs

How long does a bathroom installation take? A standard bathroom fit typically takes between 3 and 5 days, depending on the complexity of the design, the condition of the existing plumbing, and whether tiling is included. We’ll give you an accurate timeline as part of your quote.

Do I need Building Regulations approval for a new bathroom? In most cases, a like-for-like bathroom replacement does not require Building Regulations approval. However, if you’re moving the position of a soil stack, adding a new bathroom in a room that didn’t previously have one, or building an extension, you will likely need approval. Our team can advise on this at the survey stage.

How long does water heater installation take? A straightforward water heater replacement on the same system type (e.g., replacing a combi boiler with a new combi) typically takes between 4 and 8 hours. Switching system types — for example, from a vented tank to an unvented cylinder — takes longer and may require a second visit.

Do you supply the fixtures and fittings or do I need to buy them? We’re flexible on this. We can supply everything, you can supply everything, or we can work together — for instance, you choose the sanitary ware and we source the pipework and fittings. Either way, we’ll make sure what’s supplied is right for the installation.

Are your engineers qualified to work on unvented hot water systems? Yes. Unvented (pressurised) hot water systems must legally be installed and maintained by a G3-certified engineer. Our relevant team members hold this certification. Details are on our Licences & Certifications page.

Can you help with a large-scale installation for a commercial property? Absolutely. Our Commercial Plumbing team handles installations in offices, hospitality venues, retail units, and larger multi-unit developments. Get in touch to discuss your project.

Do you offer maintenance contracts after installation? Yes — our AMC (Annual Maintenance Contract) provides scheduled servicing and priority response to protect your installation long-term. View our AMC Pricing & Packages for options.

What areas of London do you cover? We cover all London boroughs. Visit our Service Areas page for full details.

Ready to Book Your Plumbing Installation?

Our team is ready to help — whether you’re planning a full bathroom renovation, replacing a water heater, or starting a new build. Get in touch today for a no-obligation quote.

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