Lead flashing is a small item on the roof and, for what it protects, one of its most important. It is also one of the costs that surprises people: a strip of metal, a few hours of work, and a bill that includes scaffold and a skilled tradesperson. Understanding where the money goes makes the quote easier to judge. This page gives sourced typical UK ranges, then walks through the factors that push a particular job towards the low end or the high end.
Typical UK ranges
All figures here come from published UK cost guides. Most are produced by directories and trade sites, so they are indications, not Beacon prices.
| Job | Typical UK range |
|---|---|
| Replacing chimney leadwork | £350 to £920, average about £570 |
| Chimney flashing, all four sides, no scaffold | About £525 |
| Chimney flashing, all four sides, with scaffold | About £1,000 |
| Patch repair to a chimney flashing | About £250 |
| Roofline scaffold hire (for comparison) | £200 to £2,600 |
Your fixed quote follows the survey. The figures are a guide so that you can tell when a number looks very high or suspiciously low, and not a menu to choose from. The same piece of lead on two chimneys can cost very differently depending on the factors below.
What is in the price
A lead flashing quote has four parts. The first is the lead itself, sold by weight, so thicker codes cost more per square metre. The second is labour, which is the larger share: a leadworker has to form the apron, steps and back gutter by hand, rake out the joints, wedge and point the lead. The third is access: scaffold or a tower, if needed. The fourth is the waste, the old lead and the mortar rubble taken away. Extras, such as repointing the stack or replacing damaged tiles around it, may be shown separately.
Lead is priced on a commodity market and so its cost moves with the market. A quote should therefore have a date, and a validity period. If the lead price spikes between quote and start, a fixed quote holds, but one that is vague may not.
What pushes the price up
Scaffold. This is the biggest swing factor. A chimney on a bungalow can be reached from a tower. A chimney on a three-storey house, or one at the back with no ground access, needs a full scaffold lift. The jump from about £525 to about £1,000 in the published four-sided figure reflects it. If other roof work is planned, sharing the scaffold spreads the cost; our answer on whether you need scaffolding for roof repairs sets out when it is required.
Number of sides and pieces. A chimney flashed on all four sides needs an apron, two sets of steps, a back gutter and cover flashings. A stack on a party wall at a gable may need only two. The more pieces, the more time.
Heavier code and longer runs. Thicker lead costs more, and long abutments use more metal. The code is chosen for the job and not to hit a price, as we explain in our guide to lead codes.
Condition of the masonry. Lead needs a sound chase. Brickwork with soft, sandy mortar must be repointed or rebuilt first, which adds cost. The stack itself belongs to our chimney repairs service.
Stripping off old work. Layers of sealant and bitumen over the old lead have to be removed and the surface made good. This takes time.
Access to the roof. A steep pitch, a fragile roof or an awkward position all add time and sometimes extra equipment.
What pushes the price down
A chimney that is easy to reach from a low roof, where scaffold is not needed, will cost less. So will one where the existing chase is sound and only the lead is renewed, or where a small number of pieces need replacing and the rest can stay. Where other work is booked at the same time, such as retiling the roof around the stack, the flashing can be done as part of a larger job and the access cost is shared.
A repair, where it is the right answer, is cheaper than replacement. Our guide to lead flashing repair or replacement explains when it is, and when it merely postpones the bill.
Lead against the alternatives, on price
Lead-free flashings can be cheaper, particularly self-adhesive strip, which needs little labour. But the lower price reflects a shorter expected life on a chimney, and we would not recommend strip as the permanent answer there. Aluminium preformed pieces can undercut lead on straightforward repeated details. Our page on lead alternatives compares them by situation. Where theft is a risk, the cost of replacing stolen lead more than once can exceed the cost of a substitute metal, and we cover that in our guide to lead theft from roofs.
How to compare quotes
Quotes for the same chimney can differ by hundreds of pounds, and the cause is nearly always scope. Put them side by side and check these items.
- Which pieces are being renewed: apron, steps, back gutter, cover flashings.
- The lead code for each piece, in writing.
- Whether scaffold or a tower is included, and for how long.
- Whether the chase is being raked out and re-pointed, or sealed with mastic.
- Whether tile or slate work around the stack is included.
- Whether waste removal is included.
- Whether the guarantee is in writing and what it covers.
A very low quote that says "new lead flashing" without more detail may be leaving out the scaffold, the pointing or the thickness. Ask for the missing information before comparing. Our overview of what affects roofing costs shows how the same logic applies across the whole roof.
Three chimneys, three kinds of bill
It helps to picture how the factors combine. Take a low chimney on a rear extension roof, reached from a tower, where the lead has split at one corner and the pointing is sound. That is a short job, probably a repair or the replacement of one or two pieces, and it sits near the bottom of the published ranges. Now take a central stack on a two-storey semi, flashed on all four sides, where the old lead is cracked throughout and the chase pointing is crumbling. That needs full scaffold, a complete new set of flashings and re-pointing, and it sits at the upper end. Finally take a tall Victorian stack on a terrace, with a lead back gutter and a shared party wall, where the brickwork needs work before any lead goes on. Here the flashing is the smaller part of a larger chimney job, and the quote should say so.
The point is not to guess your own figure from these examples. It is to see why two neighbours can be quoted very different amounts for the same label of "chimney flashing", and to ask for the scope behind each number.
Hidden extras to watch for
Most surprises on a flashing job come from things nobody could see until the old lead was off. Behind a flashing there can be a rotten wall plate, a gap in the damp-proof tray, a missing cavity tray or old cement fillet that has to be cut out. Good practice is for the quote to say how such discoveries are priced, for instance at a day rate or a rate per metre, so you are not negotiating on a scaffold. Ask also whether the price includes making good any tiles or slates disturbed around the lead, and whether the brickwork repointing is by the metre or lump sum.
VAT is the other item that moves a quote. Whether it applies, and at what rate, depends on the work, so ask for the figure with VAT shown, and compare like with like. Our answer on whether roofers charge VAT goes through it.
Booking, timing and what to expect on the day
Flashing work is usually a one-day job once the access is in place, and often a half-day for a single chimney. The scaffold goes up first, the old lead is stripped, the chase is raked out and cleaned, and the new lead is dressed and wedged before pointing. Mortar needs to set, so we avoid starting in heavy rain or hard frost. If the weather turns, the work is protected and finished when it clears. You should expect noise from the chasing out of the joints, and some dust, but nothing that needs you to leave the house.
Ask when the lead is ordered and whether the date depends on the metal arriving. If scaffold is shared with other roof work, the order of jobs should be set out in the quote so the lead goes on at the right stage, normally after the tiles around the stack are secure and before the final clean-up.
Is it worth paying more?
A flashing is a low-cost item against the damage a leak does. Water getting behind a chimney can soak the timbers of the roof, stain ceilings and rot the ceiling joists, and the repair bill for that dwarfs the cost of good lead. Paying for the right code, a sound chase and correct fixing is the cheapest insurance against that. The cheapest option is to put the lead right once. Redoing a failed job twice costs more than doing it properly once.
Where the flashing is only part of a larger project, such as a re-roof, ask for the lead to be priced as a separate line so you can see what it costs and what it is made from.
What our quote looks like
Following the survey, which comes with photographs of the stack and the lead, we send a fixed written quote. It names each piece and its code, says whether scaffold is included, covers re-pointing and waste, and states the price. If a repair is enough, we price that instead. The 10-year workmanship guarantee comes as part of the same paperwork. For the wider range of work with sheet metal, see lead roofing and leadwork, or ring 01256 213956 or use WhatsApp to arrange a visit.
