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What is the average cost of a chimney liner?
The cost of installing a chimney liner is determined by a number of factors as follows:
● The diameter of flue liner required by your appliance
● The length of the chimney flue internally
● The need to backfill with insulation
● Type of fuel being burnt
● Access to the top of the chimney stack
Diameter of flue required
Put simply, the larger diameter you require, the more your liner will cost.
6 inch diameter is normally the minimum, but this is dictated by the outlet on your appliance. In some circumstances, 5 inch can be used but you should check with your appliance manufacturer.
Type of fuel
The type of fuel that you intend to burn, will influence which type of flexible liner you require.
There are 3 types, constructed with different grades of stainless steel, and all differing in price:
• 316 inner / 316 outer. Recommended for burning dried seasoned wood, gas, oil and low sulphur coal .
• 904 inner /316 outer. Recommended for burning dried seasoned wood, coal, gas, oil, & low sulphur coal.
• 904 inner /904 outer . Recommended for burning dry seasoned wood, gas, oil, low sulphur coal, coke, peat and smokeless fuels.
Length of chimney flue
As liner is priced per metre length, this will obviously affect the cost. You need to measure from the top of stack (where the cowl sits) to the top of the register /closure plate (usually somewhere around hearth level). A chimney sweep can help with this (it's a good idea to sweep the flue anyway prior to fitting a liner, unless you're replacing one)
If insulation is required, this will add to the cost. Vermiculite loose fill insulation is your best option.
If the stack is quite tall and on an external wall, it would be a good idea to backfill with insulation, in order to keep the flue at the optimum operating temperature for extracting exhaust gases.
Also, if there is going to be a lot of space between the liner and brick stack, backfilling with loose vermiculite insulation would be a good idea.
Access will be needed to the top of the chimney stack, to either drop the liner down or pull it up, and to fit the cowling. In most cases, this can be done from ladders, by a competent person who is experienced at working at heights. However, with more complex roof arrangements or taller stacks, scaffolding may be required.
There are many factors that affect the cost of flue liner installation. However, on average, the cost for labour & materials of lining a typical chimney stack should be somewhere in the range of £450 to £1,000.
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