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Install lead flashing.
Lead Code 4 or 5 flashing at roof junctions — chimney, valleys, abutments and parapets. Heritage-grade.
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Costs, timelines, pitfalls and the right questions to ask before any roofer starts on lead Flashing.
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Lead too long
Lengths over 1.5m crack from thermal movement. Use proper jointing every 1.5m.
Lead theft
Lead remains a UK theft target. SmartWater marking, alternative materials (aluminium, terne-coated steel) for vulnerable installs.
No patination oil
Fresh lead reacts with rainwater leaving milky white streaks on the wall below. Always treat at install.
Sand-cement mortar in chase
Old chase pointing fails. Modern lead-mortar mix (1:3 lime to lead-set mortar) lasts 50+ years.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and a typical week-by-week schedule.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Code 4 lead per m² supplyStandard residential
£25–£50/m²
Code 5 lead per m² supplyHeavy duty
£35–£65/m²
Code 6 lead per m² supplyMost exposed
£40–£75/m²
Chimney flashing (full set)Front + back apron + side step
£500–£1.5k
Valley flashing per metreCode 5 lead
£80–£200
Abutment flashing per metreWhere roof meets wall
£50–£140
!
Quote spread is typically ± 18% — always get 3 quotes.
Timeline
Semi-detached full re-roof · week by week
Typical
4 phases · 3 wk
4 phases · 3 wk
W1
W2
W3
Scaffold erection
Strip + felt + battens
Tile + ridge + verge
Flashings + snags
!
Schedule slips on dependencies — pad each phase by 10–20% for real-world delays.
At a glance
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Roofer explained
Lead flashing seals every roof junction — chimney, valley, abutment, parapet, dormer. Quality lead lasts 80–150 years. Expect to pay £80–£300 per metre for UK lead flashing work depending on detail complexity.
What Does the Work Involve?
Lead is sold in coded thicknesses: Code 3 (1.32mm), Code 4 (1.80mm), Code 5 (2.24mm), Code 6 (2.65mm). Heavier codes for more exposed locations. Lead is cut to size, dressed (shaped) to fit the substrate, mechanically fixed at lap joints, and dressed into a chase in the masonry. Pointing seals the chase. Patination oil applied to prevent run-off staining on the wall below.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Code 4 lead per m² supply | 25 | 50 | Standard residential |
| Code 5 lead per m² supply | 35 | 65 | Heavy duty |
| Code 6 lead per m² supply | 40 | 75 | Most exposed |
| Chimney flashing (full set) | 500 | 1,500 | Front + back apron + side step |
| Valley flashing per metre | 80 | 200 | Code 5 lead |
| Abutment flashing per metre | 50 | 140 | Where roof meets wall |
| Parapet flashing per metre | 70 | 180 | Box gutter, dwarf wall |
| Patination oil treatment | 20 | 60 | Prevent run-off staining |
How Long Does It Take?
Chimney flashing: 1 day. Valley flashing 4–6m: half a day. Box gutter or parapet 6m: 1 day. Plus access (scaffold) time.
DIY or Professional?
Professional. Lead work requires specialist tools (lead dressers, bossing sticks) and skill. Cheap "flashband" tape patches are short-lived alternatives.
Choosing the Right Tradesperson
Lead Sheet Association (LSA) accredited roofer or specialist leadworker. Insist on Code 5 minimum for residential applications; Code 6 for box gutters and parapets. Get patination oil applied at install.
UK Regulations
Lead Sheet Association guidelines are the de facto UK standard. BS 6915 for lead grading. Listed buildings require like-for-like lead replacement. Working at Height regulations.
Common Problems
- Lead too long: Lengths over 1.5m crack from thermal movement. Use proper jointing every 1.5m.
- Lead theft: Lead remains a UK theft target. SmartWater marking, alternative materials (aluminium, terne-coated steel) for vulnerable installs.
- No patination oil: Fresh lead reacts with rainwater leaving milky white streaks on the wall below. Always treat at install.
- Sand-cement mortar in chase: Old chase pointing fails. Modern lead-mortar mix (1:3 lime to lead-set mortar) lasts 50+ years.
Frequently Asked Questions
What Code lead do I need?
Code 4: domestic step/apron flashings. Code 5: residential standard, valleys, box gutters. Code 6: parapets, exposed locations, large valleys. Cost increases ~20% per code.
Lead vs aluminium flashing?
Lead: 80–150 year life, traditional. Aluminium: 40-year life, theft-resistant, cheaper. Aluminium is increasingly chosen where lead theft is a risk.
Why are streaks appearing on the wall below the flashing?
Carbonate run-off from new lead reacting with rain. Apply patination oil at install. Existing streaks can be removed with mild acid wash.
How long should lead flashing last?
Quality Code 5 lead with proper dressing and chase pointing: 80–150 years. The chase mortar may need repointing at 30–50 years.
Can lead be repaired?
Small splits can be welded (lead-burned) by a specialist. Larger sections re-formed. Don't patch with silicone — temporary at best.
Will my insurance value lead?
Yes — quote replacement cost. Heritage cast-iron lead-clad roofs can cost £000s per m² to replicate.
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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