Specialist lead flashings, valleys, bay roofs and stepped flashings across Northampton. Code 3-5 lead, properly dressed — not sealant over a failed joint. Free no-obligation quotes.
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Failed leadwork is responsible for more persistent roof leaks in Northampton's older housing stock than any other single cause. Lead is the correct material for flashings, valleys and junctions — but it must be specified and dressed correctly to last. Sealant repairs are a temporary fix that delays the inevitable.
Northampton's Victorian and Edwardian housing — concentrated in Semilong, St James, Abington Park and the Billing Road corridor — carries a significant volume of original leadwork now 80-120 years old. Well-installed lead lasts that long. Poorly installed lead, or lead repeatedly patched with sealants and cement, fails much sooner.
The East Midlands thermal range is significant. Cold winters and warm summers mean lead expands and contracts more than in temperate coastal areas. Lead fixed too rigidly — a common fault in 1970s-80s repair work — cracks along stress lines as it cannot move. We dress all lead with correct step and lap dimensions, using clips rather than nails to allow free thermal movement. Code 3 is used for flashings, Code 4-5 for valleys and flat sections.
Bay window roofs are among the most complex leadwork jobs on Northampton terrace housing. The geometry requires careful setting out and experienced dressing to create a weathertight surface that also allows drainage. We work on original Victorian bay lead, replacement lead on previously botched repairs, and full new lead flat installations on period properties.
📞 Free quotes — no call-out fees across Northampton
Call 0160 428 1189Lead work in Northampton covers step flashings, valley linings, bay leads and chimney lead sets, dressed to BS EN 12588. Step flashing repair costs £200–£500; valley re-lead £400–£900. Sealant is never a permanent fix — we dress lead correctly with thermal movement provision. Call 0160 428 1189.
Failed lead at chimneys, valleys and abutments is behind many roof leaks. Here is how to spot it.
When it is not the answer: A sealant bodge over sound lead can sometimes be re-dressed rather than fully replaced Read the full guide.
Victorian terraces off the Wellingborough Road and in Semilong mean rear-access scaffold and permit-controlled pavement space, while the post-war estates have easier side access. Nene Valley humidity keeps north-facing roofs damp and slow to dry through autumn.
We cover Semilong, St James, Wellingborough Road and the wider NN1, NN2, NN3, NN4, NN5 area, and price every lead work job against the specific stock and access on your street — not a one-size guess.
On Northampton roofs, lead work calls most often start with damp where the roof meets a chimney or wall or sealant smeared over a joint that keeps failing. The way we approach it depends on your property and street. Victorian terraces off the Wellingborough Road and in Semilong mean rear-access scaffold and permit-controlled pavement space, while the post-war estates have easier side access. That local reality — the stock era, the access, and nene valley humidity keeps north-facing roofs damp and slow to dry through autumn — is exactly what we price against, rather than a one-size national rate.
Done properly, locally. We dress code 4/5 lead properly, so the detail outlasts any sealant repair by decades. Workmanship is guaranteed for 10 years; properly-dressed code lead outlasts any sealant repair by decades. Because we are based here and rely on our Northampton reputation, we turn up when we say, keep the site tidy — focused work at one or two details; low mess beyond a little mortar, cleared as we finish — and stand behind every job in writing. We cover Semilong, St James, Wellingborough Road and the surrounding roads, and we are happy for you to get other quotes: a proper roofer expects it.
Based in Northampton since 2004. We know the housing stock and the problems that return every winter.
Our own team on every job — not a national company farming leads to subcontractors.
No call-out fees, no hidden extras. You'll know the full cost before we start.
Written guarantee on all workmanship. We stand behind every job.
Industry-recognised standards for quality, safety and workmanship on every project.
"Lead valley on the Victorian terrace had developed a split at the centre joint. Re-dressed properly — not sealant over the top. No leaks since and the work looks exactly right for the age of the property."
"Full chimney lead set replaced on the 1930s semi — flashings, back gutter, the lot. The damp patch on the chimney breast that had been there for two winters has completely cleared."
"Victorian bay window flat lead — complex geometry and the previous roofer had botched it with sealant. Stripped back and re-dressed properly. First winter after the repair was completely dry."
Step flashing repairs — the most common job on Northampton terraces — typically cost £200-£500 depending on length and access. Re-leading a valley runs £400-£900. Bay window lead flats are £600-£1,400. Full chimney lead replacement is £300-£700. Free no-obligation quotes on all lead work.
Sealant buys 1-3 years before cracking, UV-degrading or being pushed open by lead thermal movement. It also traps moisture behind it, accelerating corrosion. A properly dressed replacement flashing lasts 50+ years. We recommend sealant only as an emergency temporary measure.
Code 3 (1.32mm) for step and cover flashings. Code 4 (1.80mm) for valleys and exposed horizontal applications. Code 5 (2.24mm) for flat lead roofs and large bay tops. Using underweight lead is a false economy — it fatigues faster and has a shorter service life.
Both. Where original Victorian lead is sound but has failed at specific points — joints, laps, or where cement has been applied over the top — we repair and re-dress the existing material rather than stripping unnecessarily. Full replacement is recommended where lead has corroded through or repeated patching has created a patchwork that cannot be made weathertight.
Correctly installed lead flashings last 50 to 100 years. Premature failure is caused by lead fixed too rigidly preventing thermal movement, underweight lead specification, and cement applied over the top trapping moisture. We dress all lead to BS EN 12588 standards.
Yes, where lead is sound but has failed at specific joints or laps. If the lead body is intact, targeted repair is cost-effective. If lead has corroded through or been repeatedly patched with cement, full replacement is the right answer.
A lead valley channels rainwater where two roof slopes meet. Lead valleys on Victorian and 1930s Northampton properties are typically 60 to 100 years old. Signs they need replacing: green staining below the valley line, damp patches on ceilings below the valley, and visible cracks or splits in the lead.
No call-out fees. No obligation. An honest quote from a local Northampton roofer.
0160 428 1189 ✉ Email Us InsteadWe inspect the lead detail and the timber and mortar it beds into.
Priced for code-correct lead replacement, not a sealant patch.
New code 4/5 lead dressed, wedged and pointed to last decades.
We check the detail sheds water correctly and clear up.
| Job | Typical duration |
|---|---|
| Re-dress a flashing | Half a day |
| Re-lead a valley | 1 day |
| Bay or abutment leadwork | 1-2 days |
Lead can be dressed in most conditions; pointing needs dry, frost-free weather to cure.
Leadwork at chimneys and valleys needs scaffold or a tower for safe, accurate dressing. Scaffold is specified for: chimney, valley and abutment leadwork above single-storey height - always itemised in your written quote, never a hidden extra, and we arrange it.
Victorian terraces off the Wellingborough Road and in Semilong mean rear-access scaffold and permit-controlled pavement space, while the post-war estates have easier side access. Pavement scaffold and skip permits go through West Northamptonshire Council; allow a few working days on streets like Semilong, St James, Wellingborough Road where space is tight.
| Job | Typical range | Notes |
|---|---|---|
| Re-dress a flashing | £200-£450 | Per detail |
| Re-lead a valley | £400-£900 | Per valley |
| Bay window leadwork | £600-£1,400 | Per bay |
| Full chimney lead set | £300-£700 | Per stack |
Worked example: Re-leading a valley between two slopes on a terrace in St James: around £620 including code 5 lead and pointing.
No deposit on repairs under £500. Staged payments on larger jobs - nothing up front before materials are on site. All prices include VAT; a written itemised quote every time.
Covering NN1, NN2, NN3, NN4, NN5 and surrounding postcodes.
Workmanship is guaranteed for 10 years; properly-dressed code lead outlasts any sealant repair by decades.
If a fault appears in covered work, we come back and put it right. No quibbling, no re-charge.
Focused work at one or two details; low mess beyond a little mortar, cleared as we finish. You do not need to stay home for external work - we just need power and access agreed in advance.
Lead dressing runs year-round; the mortar pointing that finishes it is planned for dry spells. Nene Valley humidity keeps north-facing roofs damp and slow to dry through autumn.
Last updated: August 2026
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