Lead flashing is the least glamorous part of a roof and the part most likely to let water in. If yours has split, lifted or pulled out of the mortar joint, the honest answer to "what will this cost?" is that it depends far more on access and scope than on the lead itself. Here is how the numbers actually break down.
Most homeowners contact us about one of a handful of jobs. The figures below are realistic ranges for the Stamford area rather than quotes, and they assume the roof structure underneath is sound. Any of them can shift once someone is up there and can see the substrate.
The cheapest jobs are the ones where the lead itself is fine and only the fixing has failed. The expensive ones are where lead has been used badly in the first place and needs remaking in properly sized pieces.
Access is usually the single biggest variable. A single storey extension junction reachable from a tower is a different job to a chimney on a three storey Georgian townhouse where scaffolding is the only safe option. Scaffold for a chimney typically adds £400 to £900 depending on height, pavement licences and how long it stands.
Material grade matters too. Code 4 lead suits most abutments and soakers, while Code 5 is the sensible choice for chimney back gutters and anywhere with heavy water flow. Lead is sold by weight and prices move with the metals market, so materials alone can run £60 to £100 per square metre before anyone touches it.
The third factor is what is hiding behind the flashing. Failed lead that has been leaking quietly for a couple of winters often means wet timber battens, perished felt or a rotten fascia. That is not padding on the invoice, it is the reason the repair lasts.
A lot of property here is limestone with Collyweston slate or clay pantiles, and that changes the work. Collyweston slates are irreplaceable in any casual sense, so lifting and resetting them to dress lead underneath is slow, careful work and priced accordingly. Expect a genuine premium over the same job on a modern concrete tile roof.
Soft lime mortar joints in old stone are also unforgiving. Lead should be wedged into a raked chase and pointed with a lime mortar that matches the wall, not blasted in with cement, which cracks and pulls the stone face off as it moves.
If you are inside Stamford's conservation area or your property is listed, check before work starts. Like for like repair is normally fine, but replacing a lead detail with a modern flashing tape or a GRP alternative can need consent from South Kesteven District Council. It is far cheaper to ask first.
Properly installed lead lasts sixty years or more, so age alone is not a reason to rip it out. Replace it when you see splits running across the sheet, which usually means the pieces were made too long and thermal movement has torn them, or when the lead has gone chalky and thin.
Patch it when the lead is intact and the failure is at the joint: mortar has fallen out, the wedges have dropped, or someone has smeared silicone over the top as a bodge. A cracked cement fillet used instead of lead is a different case and is almost always worth replacing with real flashing.
Be wary of anyone recommending a full chimney rebuild off the back of a flashing leak. It is sometimes justified, but it should be evidenced with photographs of the actual defect, not assumed.
Ask for the lead code being used, the access method and whether making good the pointing is included. A written quote that says "repair chimney flashing" with a single figure gives you nothing to compare and no comeback if the scope quietly shrinks.
Ask for photographs before and after as well. You cannot see a chimney from the ground, and any roofer who is comfortable with their work will happily show you it.
Self adhesive flashing tape has its place as a short term measure to stop water while you arrange a proper repair. As a permanent fix it tends to lift within a few years, and on a listed or conservation area property it may not be acceptable at all.
Generally no, because gradual wear and tear is excluded from most policies. Insurers may contribute where flashing has been physically damaged in a storm or stripped by theft, and the resulting internal water damage is often covered even when the repair itself is not.
Once access is in place, a straightforward chimney re-lead is usually one to two days. Allow extra time either side for scaffolding to go up and come down, and bear in mind lead work is best avoided in heavy rain or hard frost.
Free site visit, free quote. Send a photo if you can, we will give you a fair budget figure before we even drive over.