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Vaillant boiler, underfloor heating manifold and expansion vessel installed by LJS in a Stevenage home
Division 02 · Heating & Plumbing

Warm homes and plumbing that simply works

From a new boiler to a burst pipe at 7am, LJS keeps Stevenage homes warm, safe and running. Qualified, Gas Safe standard work with clear pricing and no mess left behind.

Fast local response

Often with you within a couple of hours

On time, as promised

We turn up when we say we will

Gas Safe standards

Safe, compliant work every time

Megaflo unvented hot water cylinder installed by LJS with neat copper pipework in a Stevenage airing cupboard
LJS · Stevenage
01 · New boilers, swaps and repairs

Boiler Installation & Repair

New boiler installations, straight swaps and reliable repairs. We size the system correctly, fit it cleanly and leave your heating running better than before.

  • Combi, system and conventional boilers
  • Like for like swaps and full upgrades
  • Breakdown diagnosis and repair
  • Manufacturer backed warranties
Vaillant boiler with new copper pipework and an underfloor heating manifold installed by LJS in a Stevenage utility room
LJS · Stevenage
02 · Systems, radiators and power flushing

Central Heating & Radiators

Full central heating installs, radiator upgrades, thermostatic controls and power flushing to clear sludge and restore even, efficient heat.

  • Full system design and installation
  • Radiator upgrades and relocations
  • Power flushing and system cleanse
  • Smart thermostats and zoned controls
LJS plumber press fitting new copper pipework under the floor of a Stevenage home
LJS · Stevenage
03 · Rapid response, real fixes

Emergency Plumbing

Leaks, bursts, blockages and loss of heating. We aim to be with you fast, find the cause and fix it properly, not just patch it over.

  • Fast local response
  • Leak detection and repair
  • Burst pipes and blockages
  • Tidy, permanent fixes
Joule unvented hot water cylinder installed by LJS in a loft with new copper pipework
LJS · Stevenage
04 · Cylinders, taps and instant hot water

Hot Water & Cylinders

Unvented cylinders, hot water systems, instant hot taps and tap replacements. Strong flow and hot water on demand throughout the home.

  • Unvented cylinder installation
  • Instant hot water taps
  • Tap and valve replacement
  • Pressure and flow improvements
Why LJS

The reliable choice homeowners come back to

No call centres, no subcontracted strangers and no vanishing acts. Just a qualified local tradesperson who does what they say and finishes what they start.

A qualified plumber and heating engineer with over a decade of hands on experience across every kind of home.

How it works

Simple, clear and stress free

From your first message to the final sign off, you always know what is happening and what happens next.

01

Get in touch

Call, message or send a few details. We talk through what you need and book a convenient time.

02

Survey & quote

We assess the job properly and give you a clear, itemised quote with no surprises.

03

The work

We arrive on time, protect your home and carry out the work cleanly to a high standard.

04

Signed off

We test everything, walk you through it and leave the space tidy. Aftercare is a message away.

Reviews

Trusted across Stevenage and beyond

The same feedback comes up again and again: on time, honest and a genuinely tidy, high quality finish.

4.9 / 5

from 47+ verified reviews

Basement conversion with shower room

10/10
This was the second job Luke and his team did for us, the first being a very nifty under stairs half bathroom. This time was a conversion and upgrade of our two basement rooms: complete modernisation combining the two, with a new integral shower room with toilet. Luke has a real can-do approach, works with some lovely people, and is really good at working with you to help achieve your ideas. It's another lovely job and we're delighted.

Verified Checkatrade reviewer

SG4, July 2026

Amazing work

10/10
You can tell from the get-go Luke is someone who really cares about his work, he has a lovely group of people working with him and is more fairly priced than a lot of competitors. We are not the easiest customers and we made quite a few changes during the process which Luke was more than happy to address and assist us in changing, and even covered the costs of some parts he felt would be unfair to make us pay for again. We couldn't be happier with our new bathroom, we are so glad we went with Luke.

Verified Checkatrade reviewer

SG18, June 2026

Outstanding service and excellent workmanship

10/10
Luke and the team at LJS Plumbing did a brilliant job on our bathroom. My wife and I are expecting a baby, so we were on a tight deadline, and they stayed late to make sure everything was finished on time and to a very high standard. The quality of the work is excellent and we're over the moon with the result. I found a couple of small snagging items and Luke booked them in straight away. I was a bit nervous using a company I hadn't used before, but I couldn't fault them. Highly recommend.

Verified Checkatrade reviewer

CM21, May 2026

Very happy customer

10/10
I was very impressed from the quote visit to the work being carried out. The team ensured that our carpets were protected from any work debris. They attended on time on date. The team worked late into one evening so that we wouldn't be without heating, even though we said that they could leave the heating till the following day. When we noticed a very slow leak from one the new radiators, Luke made sure that on a day we were back from a mini break, the radiator was fixed. I would highly recommend this company.

Verified Checkatrade reviewer

MK45, December 2025

Bathroom looks great!

10/10
A lovely team of skilled professionals led by Luke, who was always available for questions and reassurance. Bathroom looks brilliant and highly recommend!

Verified Checkatrade reviewer

SG6, November 2025

Re-fitted bathroom

10/10
Luke heads a professional and enthusiastic team. Work was carried out with no fuss and no mess. I was fully consulted at every stage on progress and choices. Any unforeseen problems were dealt with promptly. Nothing was too much trouble. I am very pleased with my refitted bathroom.

Verified Checkatrade reviewer

AL1, November 2025

Where we work

Proudly serving Stevenage and the counties around it

Based in Stevenage and covering the towns and villages around it. If you are local, there is a good chance we already work on your street.

Counties covered

HertfordshireBedfordshireEssexCambridgeshire

Core postcodes

SG1SG2SG3SG4SG5SG6
Stevenage
Old Stevenage
Knebworth
Hitchin
Letchworth
Baldock
Welwyn Garden City
Hertford
Ware
Codicote
Datchworth
Aston

Not sure if we cover your area? Call 07925 532675 and just ask.

Good to know

Questions, answered

Straight answers to the things Stevenage homeowners ask us most. Cannot see yours? Send a message and we will happily help.

Free, honest quotes

Boiler trouble or a leak? Let us sort it

Call or message for a fast, honest response. We will tell you what is wrong, what it costs and get your home back to normal.

Checkatrade4.9Gas Safe standards
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