Gas Pipework: Installations, Alterations & Capping
Whether you are completely re-configuring a property layout, upgrading an appliance, or need a gas supply made safe for builders to begin work, iWarm handle all domestic gas pipework alterations. As independent Gas Safe engineers, we ensure your home’s gas infrastructure is correctly sized, safely routed, and legally compliant.
Pipe Sizing & Pressure Loss
Gas doesn’t just flow; it loses pressure as it travels. Every meter of pipe, every bend, and every elbow fitting creates resistance. If a pipe run is too long, or if multiple appliances (like a high-output combi boiler and a 5-burner gas hob) are demanding gas simultaneously, a standard pipe diameter will cause the working pressure to drop below safe manufacturer tolerances.
We don’t guess pipe sizes. We calculate the exact required diameter based on the total kW demand of your appliances, the length of the run, and the resistance of the fittings to ensure your system operates safely and efficiently without starving your boiler or cooker of gas.
Property Renovations & Temporary Capping
If you are ripping out a kitchen or undergoing major property development, live gas pipes pose a massive risk. We work alongside homeowners, builders, and kitchen fitters to manage the gas supply throughout the project:
- Temporary Disconnections: Safely capping off live supply pipes so demolition and structural work can proceed without hazard.
- Pipe Rerouting: Altering and concealing pipework to accommodate new kitchen layouts or relocated boilers, ensuring all hidden pipework is correctly sleeved and protected against corrosion.
Complete Appliance Integration
If you are having a new boiler, gas cooker, or hob installed, the pipework routing is handled concurrently. We install the required infrastructure directly alongside the appliance, ensuring seamless connection, correct clearances, and immediate commissioning.
Tightness Testing & Compliance
Every alteration to your gas supply, no matter how minor, requires strict safety verification. Upon completion of any pipework installation or capping, we perform a comprehensive gas tightness test across the entire property to guarantee there are zero pressure drops or leaks on the network.
Arrange a Site Visit
If you need pipework altered for a renovation or a new appliance, tap the button below to call me directly, or use the contact form to provide details of your project.
Gas Pipework | Installation, Alterations and Capping
EXCELLENT
Based on 8 reviews
Posted on Google
James6 October 2026Trustindex verifies that the original source of the review is Google.
Great service, quick booking and visit. Sent the certs same day. Recommended.Posted on Google
Samara6 July 2026Trustindex verifies that the original source of the review is Google.
Great service, reasonable pricing, got the job done extremely quick, nice lad, very professional and cleaned up after himself, absolutely would recommendPosted on Google
Dainora27 May 2026Trustindex verifies that the original source of the review is Google.
I had a boiler issue, stopped working. He arrived on the same day and ensured that the boiler works while we wait for parts. Kept me updated while parts were coming and asked if the boiler is still working. Always kept the area clean and explained what was the issue. Great job! Definitely recommend.Posted on Google
Adrian18 May 2026Trustindex verifies that the original source of the review is Google.
Fantastic service from Guy, who travelled out to Market Rasen on a Sunday when our boiler stopped working. He was super professional, quick to sort the issue, and great value for money. With kids in the house, getting the heating and hot water back on meant everything, definitely one of those luxuries you take for granted until they’re gone. Really appreciate the effort and would highly recommend.Posted on Google
Annette29 March 2026Trustindex verifies that the original source of the review is Google.
Guy came to us today which was a wet and cold Sunday afternoon as my Elderly Mother was without heating. After initial contact a time was agreed and Guy arrived on the dot.... He was very good and explained everything he was doing ensuring we understood what was happening. Guy was very clean and there was not a single bit of mess left behind. He made sure we were happy with the work and didnt leave until he was 100% sure the problem was fixed. There was no hard sell with Guy at all he explained a few options for us in the future. Would HIGHLY reccommend Guy and have saved his details for future use. 5☆☆☆☆☆Posted on Google
David20 March 2026Trustindex verifies that the original source of the review is Google.
Thank you very much for servicing my boiler and balancing my radiators. All working well again. Highly recommended.Posted on Google
James10 March 2026Trustindex verifies that the original source of the review is Google.
Was polite and tidy. Fixed an issue with our central heating and fitted a new bathroom radiator. Thanks
Questions? Contact us
Serving customers in Grimsby, Cleethorpes, Immingham, Louth, Brigg, Caistor, Market Rasen, Barton upon Humber and Scunthorpe.

