Lead valley replacement, chimney flashing, dormer covering and bay window lead work across Darlington. Properly installed lead lasts 50–100 years. We do it right the first time — free quotes, written guarantee.
We use Code 4 lead (1.8mm) for soakers and stepped flashings, and Code 5 lead (2.24mm) for cover flashings, valley gutters and larger flat areas. These are the correct specifications for domestic work as recommended by the Lead Sheet Association. Thinner lead is sometimes used by cheaper contractors — it fails faster and is a false economy on any Darlington property.
Lead installed correctly to BS 6915 specification typically lasts 60–100 years. The failures we see on Darlington properties are almost always down to incorrect installation — lead that's fixed too rigidly and splits under thermal movement, or joins that haven't been properly lapped and dressed. Done correctly, lead outlasts every other roofing material.
Usually yes. Valley replacement is a self-contained operation — we lift the tiles adjacent to the valley, remove and replace the lead gutter, and re-lay the tiles. Provided the tiles themselves are undamaged and the nail fixings are sound, full retiling isn't necessary. We'll confirm at survey whether the surrounding tile condition allows this approach.
Lead is the highest-performing traditional roofing material — flexible, corrosion-resistant and lasting a century when installed correctly. Darlington's Victorian and Edwardian stock has extensive lead work that needs skilled hands.
Step and cover flashings, soakers and back gutter replacement. The most common lead repair call from Darlington properties — particularly on north-facing chimney stacks where exposure is greatest.
Get a quote →Open and secret valley lead replacement on pitched roofs. Valleys are the lowest point of any roof and carry the highest water volume — code 5 lead minimum, correctly laid with proper welted joints.
Get a quote →Dormer cheeks, top flashings and abutments re-covered in lead. Dormer lead failures are common on the extended Victorian terraces across Darlington town centre and the inner suburbs.
Get a quote →Lead flat roof covering for bay window tops and small flat areas. Correctly specified code 5 lead with proper drips and welted joints — not the thin code 3 material used in substandard work.
Get a quote →Lead flashings at roof-to-wall junctions, parapet copings and abutment points. Critical on Darlington's terraced and semi-detached stock where party wall junctions carry significant water exposure.
Get a quote →Where existing lead has lifted or worked loose but is otherwise sound, re-dressing and correct re-fixing extends its life without full replacement. We assess honestly before recommending the most cost-effective approach.
Get a quote →"Lead valley had been leaking for two years. Previous roofer kept resealing it with mastic. Darlington Roofing stripped it out and replaced the full valley in code 5 lead. Completely dry since. Should have been done properly years ago."
"Dormer cheeks on our Victorian terrace needed full lead re-covering. Beautifully executed job — correct code lead, proper steps and soakers, welted joints throughout. No corners cut."
"Bay window flat top was leaking. New lead covering with correct upstand and overflow. Done in half a day, guaranteed for the life of the lead. Exactly what you want."
Free quote, no call-out fee. We cover all of Darlington and County Durham.
01325 000 000Realistic 2025 prices for Darlington properties. All quotes are free, written and itemised before work begins.
| Job Type | Typical Cost |
|---|---|
| Lead flashing — chimney abutment | £350–£700 |
| Lead valley replacement (per m) | £200–£350/m |
| Bay window lead flat roof | £400–£800 |
| Dormer lead work | £500–£1,200 |
| Lead soakers (per 10) | £150–£300 |
| Lead re-dressing and resealing | £150–£400 |
All prices are installed costs. Call 01325 000 000 for a free written quote.
Lead roofing on Darlington properties takes several forms depending on the era and type of construction. Victorian terraces, 1930s semis, and post-war concrete tile estates. Chimney flashings are the most frequent repair call — step and cover flashings at chimney abutments that have either been incorrectly installed, installed in underspec material, or simply reached the end of a 40–60 year lifespan. Valley gutters on pitched roofs and flat lead sections over bay windows and porches are the other common lead work items we attend in Darlington.
Lead failure in Darlington is almost always caused by inadequate allowance for thermal movement rather than material failure. County durham climate with wet winters and freeze-thaw cycles. A 3m lead valley sheet can move 15–20mm between midwinter and midsummer. If the sheet is fixed at multiple points and cannot move freely, it splits at the fixings over time. We form all lead bays to Lead Sheet Association specification — maximum 1.5m for Code 4, 2.25m for Code 5 — with correct clips rather than through-fixings.
The correct lead specification for Darlington varies by application. Code 4 lead (1.8mm) for chimney soakers and stepped flashings; Code 5 (2.24mm) for cover flashings and valley gutters; Code 6 (2.65mm) for larger flat roof sections and parapet gutters. Using Code 3 lead — which some contractors use to reduce material costs — on applications that require Code 4 or 5 produces a product that fails significantly earlier than correctly specified lead. All our lead work in Darlington is specified to BS EN 12588 and installed to Lead Sheet Association guidelines.
Lead flashing replacement around a chimney stack typically costs £200–£450 in Darlington. Full lead valley replacement runs £350–£750. Larger lead flat roof sections — dormer tops, bay windows — cost £500–£2,000+ depending on area. We provide free written quotes.
Properly installed lead work has a lifespan of 50–100 years. Lead failures on Darlington roofs are almost always the result of incorrect original installation — insufficient overlap, inadequate fixings, or the use of substandard lead thickness. We use code 4 and code 5 lead minimum throughout.
Code 4 and 5 refer to the weight and thickness of the lead sheet. Code 5 is thicker and more durable — appropriate for flat areas and chimney back gutters. Code 4 is standard for step flashings and soakers. We specify the correct code for each application rather than cutting costs with undersized lead.
Sometimes yes — if the lead is sound but has lifted or worked loose, re-dressing and resealing can restore it. If the lead is cracked, corroded or has been bodged with mastic, full replacement is the only lasting fix. We'll assess honestly and show you the evidence.
No call-out fees. No obligation. An honest quote from a local roofer who turns up when they say they will.
01325 000 000