Lead or zinc for a period roof?

Lifespans for roofing metals come from different kinds of source, so it helps to see who is saying what. For lead, MyJobQuote's guide updated in September 2026 says flashing can last over 80 years when correctly installed, and over 100 years in the higher codes. For lead flat roofs, Less gives 50 to 100 years.

For zinc, VMZINC, the manufacturer, says in excess of 100 years and cites a Building Research Establishment environmental declaration that states 100 years. A contractor quoted by HomeBuilding in 2020 gave 60 to 100 years. The maker also gives a material warranty of up to 50 years, agreed project by project. That is cover for the product, which is a different thing from a forecast of the roof's life.

The honest reading is that the ranges overlap heavily. Neither source of figures sets one metal clearly ahead, and with either metal, the real outcome rests on exposure, the standard of the work and whether movement was allowed for. A badly detailed roof in either metal fails early. Treat every figure here as typical, never as a promise.

Appearance is where the two part company most. Lead starts bright and settles to a soft, even grey that is familiar on churches, porches and bay roofs. It is dressed by hand to follow stone and brickwork closely, and an old repair next to new work blends in once both have weathered. That visual match is the main reason lead is the metal people picture on a historic roof.

Zinc is a harder, more rigid sheet. It begins as a bright blue-grey and darkens as it ages, and it is often formed into standing seams, which give straight, regular lines that suit some architecture and look out of place on others. It is stiffer than lead, so detailing around awkward shapes such as a curved bay is less forgiving.

Run-off

New lead can shed pale carbonate that streaks the stone below, which is why we treat fresh sheet. Our answer on white streaks from lead explains the effect. Zinc does not behave in that way, but it brings its own considerations about what runs off it onto other materials and how it sits beside neighbouring metals.

Lead is heavy, soft and valuable as scrap, which is why it is the metal that gets taken from churches, quiet outbuildings and empty buildings. Zinc is far less attractive to a thief. If previous theft is the reason you are reconsidering lead, that is a reasonable argument in zinc's favour, and a fair one to make to a conservation officer too.

It is not the only answer. Lead can be fixed with extra clips, marked, and protected by lighting and sightlines, as we set out in our guide on lead theft. Where a roof has already been stripped once, some owners accept zinc, or another alternative, on the parts that are hard to guard. Our guide to lead alternatives: GRP, synthetic flashing and zinc covers the full range of substitutes rather than just this pair.

On a listed building, changing the covering from lead to another metal is the sort of alteration that can affect the building's character. The district council's own conservation guidance describes a listed house as covered by the law in every part, high grade or low. Swapping like for like is the simple route, whereas a change of metal means talking to the conservation department before any quote is signed.

In a conservation area, the position depends on the building and on any Article 4 Direction. The council's public page leaves open whether such directions reach roofs, so raise it with the planners early. Where lead has been stolen from a listed church or house, the officer may well accept a substitute on a hidden or exposed area. That is a judgement for them, not us.

Neither metal is a safe route to consent. Showing photographs of the existing roof, the proposed detail and the reason for the change gives the officer something concrete to decide on.

MyBuilder's 2026 flat roof guide quotes lead at £150 to £200 or more per m². We hold no matching published figure for zinc, so none appears in this answer, and zinc is priced from your own roof after a survey. Cost also depends on the work: dressing lead to stone is slow, skilled work, and zinc seams call for their own tools and training.

Neither is a job to attempt without experience. If you are weighing up a do-it-yourself fix with either metal, see whether you can replace lead flashing yourself. Where a lead roof only has a local fault, lead welding may mend it without a change of metal.

Choose lead where matching the old fabric matters, and zinc where theft or detailing points that way. Whichever you pick, the written quote covers scaffold, strip, metal, labour and making good, and a written 10-year guarantee covers our workmanship. Other leadwork is described on the lead roofing page, and photographs of your roof, sent by WhatsApp or the enquiry form, let us give a first view of which metal suits.