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Install a chimney liner.
Flexible stainless steel liner for wood burners or open fires — HETAS-compliant, with insulation and a top cap.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Hiring a chimney sweep, without the regret.
Four moves that separate a smooth job from a nightmare.
Wrong grade liner
316 grade for wood corrodes. Always 904 for wood/multi-fuel.
No insulation
Cold liner cools flue gases. Tar build-up. Insulation essential.
Inadequate top seal
Rain enters. Damages liner and chimney.
Sharp bends
Liner damaged during install. Visually inspect.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Flexible 316 grade per metreGas appliances
£30–£60
Flexible 904 grade per metreWood/multi-fuel
£40–£80
Twin-wall rigid flue per metreExternal chimney
£60–£120
Cowl / chimney topCapping
£50–£200
Vermiculite insulation fillImproves draw
£80–£250
Standard 5m liner installDomestic semi
£500–£1.2k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Chimney Sweep explained
Chimney linings protect old chimneys and improve stove performance. Required for most wood-burner installs. Expect to pay £500–£1,800 for UK chimney lining.
What Does the Work Involve?
HETAS engineer or sweep accesses top of chimney. Flexible stainless steel liner (904 grade for wood; 316 for gas) lowered down chimney. Top plate (cowl) seated. Liner connected to stove. Vermiculite or LECA insulation poured around liner (improves draw and cooler external surface). Pressure tested.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Flexible 316 grade per metre | 30 | 60 | Gas appliances |
| Flexible 904 grade per metre | 40 | 80 | Wood/multi-fuel |
| Twin-wall rigid flue per metre | 60 | 120 | External chimney |
| Cowl / chimney top | 50 | 200 | Capping |
| Vermiculite insulation fill | 80 | 250 | Improves draw |
| Standard 5m liner install | 500 | 1,200 | Domestic semi |
| Longer 7m+ liner install | 900 | 1,800 | Multi-storey |
How Long Does It Take?
Standard 5m liner: 1 day. Twin-wall external: 2 days.
DIY or Professional?
HETAS-registered engineer only.
Choosing the Right Tradesperson
HETAS-registered. 904 grade for wood (more corrosion resistant). 316 grade for gas. Manufacturer warranty 25+ years.
UK Regulations
Building Regs Part J. HETAS notification self-certifies. CO alarm mandatory.
Common Problems
- Wrong grade liner: 316 grade for wood corrodes. Always 904 for wood/multi-fuel.
- No insulation: Cold liner cools flue gases. Tar build-up. Insulation essential.
- Inadequate top seal: Rain enters. Damages liner and chimney.
- Sharp bends: Liner damaged during install. Visually inspect.
Frequently Asked Questions
Do I need lining?
For wood burner in older chimney: usually yes. Improves draw, prevents tar damage. Modern chimney: sometimes optional.
How long does liner last?
904 grade for wood: 25-30 years. 316 grade for gas: 30+ years. Quality liner warranted 25+ years.
Flexible or twin-wall?
Flexible: existing chimneys, cheaper. Twin-wall rigid: new chimneys or external runs.
Will lining damage chimney?
No — protects chimney from acidic flue gases. Improves chimney longevity.
Insulation around liner?
Essential — smaller diameter heats faster. Gases rise faster, drawing more air through fire. Better burning.
Annual sweep with liner?
Yes — annual sweep removes tar and creosote. Liner makes sweeping easier and more effective.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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