Chimney & Flue Lining Services
Every flue is different — here's how we approach each type of appliance and chimney.
Gas Flue Lining
Gas fires, gas boilers and gas stoves need a flue that's sized correctly for the appliance's output — too wide or too narrow and the appliance won't draw properly. We fit flexible stainless steel liners to serve gas appliances, sized and installed to current Gas Safe standards.
Gas doesn't carry the acid content of solid fuel, so a grade 316 liner is the standard choice here, offering a long service life without the corrosion risk that comes with slumbering solid fuel appliances.
Typical jobs
Open-flue gas fires, balanced-flue conversions, gas stove installations in period fireplaces.
Liner grade
Grade 316 stainless steel — the standard for gas and well-seasoned solid fuel.
Normal use
Logs and well-seasoned solid fuel burned at normal operating temperature.
Slumbering / overnight burn
Stoves left on a low overnight burn with coal or anthracite, where condensation and acid content corrode a standard liner faster.
Solid Fuel & Log Burner Lining
Wood burners, multi-fuel stoves and open fires each put different demands on a flue. The grade of liner should be chosen for how the appliance is actually run, not just what fuel it burns.
Grade 316 covers most wood-burning and well-seasoned fuel use. Where a stove is left slumbering overnight on coal or anthracite, the higher acid content and condensation call for grade 904, which resists that corrosion far better over the liner's life.
Chimney Relining
Many older London chimneys were originally lined with parge render or clay liners that degrade over decades. Once that lining cracks or breaks down, smoke and condensation can pass into the surrounding brickwork — a common cause of damp and staining on chimney breasts in period properties.
Relining replaces the failed lining with a stainless steel liner sized to the flue, restoring integrity and bringing the chimney back in line with current regulations before any new appliance is connected.
Common signs
Damp patches on a chimney breast, a smell of soot after rain, or an appliance that won't draw well.
The regulation
Flues of 12 metres or more must be lined before a new gas or solid fuel appliance is installed.
No chimney needed
Twin-wall systems create a route for the flue where no masonry chimney exists.
Typical use
New stove installations away from an existing chimney breast, extensions and loft conversions.
Twin-Wall Flue Systems
Where there's no existing chimney to work with — a new stove in an extension, or a room without a masonry flue at all — a twin-wall system builds the route from scratch. The insulated double-wall construction keeps external surface temperatures safe while maintaining the draw the appliance needs.
These systems can run internally through a stud wall or externally up the outside of the building, and are fitted with the same attention to clearances and terminal positioning as any masonry-chimney installation.
Chimney Lining Certificates
Every liner we install is documented with a completion certificate confirming what was fitted, the grade of liner used, and that the installation meets current standards. It's the paperwork building control, insurers, and a future buyer's solicitor will all ask to see.
If you're selling a property with a lined chimney but can't locate the original certificate, get in touch — we can advise on next steps for your particular flue.
What's recorded
Liner grade, flue dimensions, appliance served, and date of installation.
Why it matters
Often requested at the point of sale or by a buildings insurer after a claim.
Not sure which service you need?
Tell us about the appliance and the chimney — we'll recommend the right approach.