Chimney Flue Lining
Chimney Flue Lining in London, Hertfordshire & Essex
A huge number of chimneys in the UK are over 100 years old. They're built from lime and mortar, they've had decades of heavy use, and many have been through two world wars. It's no surprise that a lot of them are porous, cracked, or leaking.
If your chimney isn't properly lined, smoke, tar, and acids get absorbed by the chimney walls. Over time, that leads to deteriorating mortar joints, staining on the exterior brickwork, and dangerous fumes leaking into your home. Since 1965, building regulations have required new chimneys to be lined, and most stove manufacturers now list it as a requirement for installation.
SweepSmart is a HETAS registered installer and Guild of Master Sweeps member. We line chimneys for stoves and closed appliances across London, Hertfordshire and Essex using Schiedel stainless steel liners, recognised as one of the best products on the market. All our chimney lining comes with a lifetime guarantee (terms apply).
Why Line Your Chimney?
A properly fitted liner doesn't just keep your household safe. It improves how the whole system works. Lining eliminates flue leaks, improves stove performance and efficiency, creates better up-draught so the fire draws properly, prevents staining on external walls, reduces particle emissions and deposits inside the flue, and makes the chimney easier to maintain and sweep going forward.
What Happens if the Chimney Fails a Pressure Test?
If a pressure test shows the flue is leaking, it must be lined before the chimney can be used safely. The best method depends on two things: the appliance you're using and the construction of the original flue. We'll review the camera footage with you and talk through the most suitable option.
If you're reinstating an old chimney that hasn't been used, a pressure test is needed first to check whether lining is feasible. Read more about our Level 1 & Level 2 Inspections, which include pressure testing.
Maintaining a Lined Chimney
All lining methods have a life expectancy, and that can be significantly reduced by burning the wrong fuels or using the appliance incorrectly. Once your chimney is lined, an annual sweep and service keeps everything in good condition and catches any issues early. As your chimney sweep, we'll see the liner every year and flag anything that needs attention before it becomes a problem.
Lining for Stoves and Closed Appliances
The most common method for a stove or closed appliance is a stainless steel liner. With a stove pipe or adapter, the appliance connects directly onto the liner, creating a smooth, sealed passage for gases to travel. Closed appliances also require a smaller diameter flue, so an appropriately sized liner can usually be passed down the original brick flue.
We always recommend checking the chimney with a camera inspection first to confirm the liner will fit and to identify any obstructions.
For our steel liners, we use Schiedel products exclusively. We've found they offer by far the most durable and reliable product, and we won't compromise on quality or safety by using cheaper alternatives.
Lining for Open Fires and Larger Flues
Open fires need a larger flue diameter, which makes standard steel lining more difficult. The original flue is likely to have bends that would obstruct a rigid liner, and in some cases it would mean making a hole in the chimney breast to feed the liner through.
For open fires and larger flues, we use FuranFlex25 RWV composite lining. This is a specialist method that can line chimneys of virtually any shape or size without removing the fireplace or making holes in the chimney breast.
Read more about our specialist chimney lining service here:
Think your chimney might need lining? Get in touch for a straight answer and a clear quote. We're a Which? Trusted Trader with over 1,000 five-star reviews.
FAQs
What happens if my chimney is too old or damaged for lining?
We'll assess the situation and explain your options. Some older chimneys can still be lined with the right method. If the structure is too far gone, we'll tell you honestly rather than attempt something that won't work long-term.
How long does a chimney liner last?
All lining methods have a life expectancy. Schiedel stainless steel liners come with a lifetime guarantee, but lifespan can be reduced by burning the wrong fuels or using the appliance incorrectly. Annual sweeping and servicing keeps everything in good condition.
What type of liner do you use?
For stoves and closed appliances, we use Schiedel stainless steel liners — recognised as one of the best on the market. We won't compromise on quality or safety by using cheap alternatives.
Do I need an inspection before lining?
We recommend a camera inspection first to confirm the liner will fit and to identify any obstructions. In some cases, a Level 2 Inspection with pressure testing may be needed to confirm whether lining is required.
Can you line a chimney for an open fire?
Open fires need a larger flue diameter, which makes steel lining more difficult. Popular alternatives include Eldfast, Thermocrete, and Furanflex. We don't specialise in these methods, but we know when they're the right solution and we can recommend trusted companies who do. We'd rather point you to a specialist than try to do everything ourselves.
How do I know if my chimney needs lining?
If the chimney has failed a pressure test, if there are signs of leaking (staining, fumes), or if the flue is unlined and you're installing a new appliance, it likely needs lining. Since 1965, building regulations have required new chimneys to be lined, and most stove manufacturers now list it as a requirement.