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Repair & repoint a chimney.
Above-roof masonry repair — repointed, flashed and capped with full scaffold. Stops leaks at the stack.
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Cement mortar
Pure cement on heritage brick too hard. Spalling. Lime mortar mix.
Cracked pots
Frost cracks clay pots. Replace.
Internal damp at chimney breast
Water ingress at stack. Repoint and re-flash.
Birds in disused chimney
Cowl or anti-bird cage. Wildlife Countryside Act in breeding season.
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
Chimney repointingHand-rake + remortar
£400–£1.2k
Full stack rebuildDown to roof
£1.2k–£3.5k
Lead chimney flashingApron + step + back
£250–£700
Chimney cap installClay or stainless
£150–£400
Anti-bird cowlPlus install
£50–£200
Render repairCement-lime mix
£250–£800
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Chimney Sweep explained
Chimneys take significant UK weather. Failing mortar, cracked bricks, worn flashings cause internal damp. Expect to pay £400–£3,500 for UK chimney repair work.
What Does the Work Involve?
Common chimney work: repointing (raking out failed mortar, refilling), rebuild (stripping stack, rebuilding), flashing (replacing lead apron, side step, back gutter), cap and cowl, render repair.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Chimney repointing | 400 | 1,200 | Hand-rake + remortar |
| Full stack rebuild | 1,200 | 3,500 | Down to roof |
| Lead chimney flashing | 250 | 700 | Apron + step + back |
| Chimney cap install | 150 | 400 | Clay or stainless |
| Anti-bird cowl | 50 | 200 | Plus install |
| Render repair | 250 | 800 | Cement-lime mix |
| Scaffold (1 week) | 400 | 900 | Around chimney |
How Long Does It Take?
Repointing: 1-2 days. Stack rebuild: 2-4 days. Flashing: 1 day. Plus scaffold time.
DIY or Professional?
Professional only. High access, structural work, sometimes structural calculations.
Choosing the Right Tradesperson
NFRC member or specialist chimney engineer. Heritage stonemason for listed.
UK Regulations
Listed buildings need consent. Working at Height. Sometimes structural calcs.
Common Problems
- Cement mortar: Pure cement on heritage brick too hard. Spalling. Lime mortar mix.
- Cracked pots: Frost cracks clay pots. Replace.
- Internal damp at chimney breast: Water ingress at stack. Repoint and re-flash.
- Birds in disused chimney: Cowl or anti-bird cage. Wildlife Countryside Act in breeding season.
Frequently Asked Questions
Repoint or rebuild?
Mortar joints >6mm wide or brickwork cracking through bricks: rebuild. Otherwise repoint.
Lime or cement mortar?
Heritage brick: lime mortar (1:1:6). Modern brick: cement acceptable. Lime is softer and "moves" with brick.
When to rebuild stack?
Severely cracked. Mortar widely failed. Heritage stonemason quotes.
Cap unused chimneys?
Yes — prevents rain, birds. Vented caps maintain airflow. Solid caps cause condensation.
How long does repointed chimney last?
Quality lime mortar: 40+ years. Cement mortar: 5-10 years.
Insurance pay?
Sometimes — if covered by storm/subsidence. Maintenance issues: rarely.
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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