Roofing advice & FAQs

A well-laid slate or clay tile roof in the UK can last 60 to 100 years, while concrete interlocking tiles typically last 30 to 50 years. Flat roofs are shorter-lived: a traditional felt flat roof may last 10 to 20 years, whereas EPDM rubber membranes can last 25 to 40 years with proper installation. The lifespan of any roof is shortened by blocked gutters, failed flashing, and lack of ventilation, all of which cause water to sit where it should not. Regular inspection every few years adds years to a roof's life.

You are likely to need a full replacement rather than a patch repair if more than 20 to 30 per cent of your tiles are cracked, slipped or missing, or if the roof deck underneath shows signs of rot or sagging. Other indicators include daylight visible in the loft, persistent damp patches on upper ceilings despite repeated repairs, and widespread moss growth that has lifted and cracked many tiles. A single cracked tile or failed flashing is usually a straightforward repair. The key question a roofer should answer honestly is whether the underlying structure and remaining tiles are still sound.

Repair is the right choice when the roof is structurally sound and only a small number of tiles or a section of flashing has failed. Full replacement makes more financial sense when the roof is ageing, repairs are becoming frequent, or the underlying timbers and felt underlay are deteriorating. A useful rule of thumb is that if repair costs are approaching 50 per cent of replacement costs within a short period, replacement is the better long-term investment. Ask any roofer to explain clearly why they are recommending one option over the other before agreeing to any work.

A full roof replacement on a typical UK semi-detached house costs roughly £5,000 to £12,000, depending on size, materials, and access. Natural slate is at the higher end, concrete tiles at the lower end, and labour costs vary by region. Smaller repairs, such as replacing a few tiles or repointing a ridge, typically cost £150 to £600. Any quote should be itemised so you can see what you are paying for materials, labour, and removal of old materials separately.

In most cases, like-for-like roof replacement is covered by permitted development rights and does not require planning permission. However, if your property is in a conservation area or is a listed building, you will need to check with the local planning authority before starting any work, even if you are simply replacing tiles. Changing the shape of a roof, adding a dormer, or using materials that differ noticeably from the original almost always requires permission. If you are unsure, it is always safer to check before work begins rather than face an enforcement notice after.

There is no dedicated roofing grant for most homeowners, but those on certain means-tested benefits may qualify for help through the Warm Homes: Local Grant or the Boiler Upgrade Scheme if roof insulation is part of a wider energy improvement. The UK Government's ECO4 scheme can fund insulation measures for eligible low-income households, which sometimes includes loft insulation as part of a roofing project. Local councils occasionally run their own assistance schemes for older or lower-income residents, so it is worth checking directly. Always verify eligibility through official government or council channels rather than third-party cold-callers.

A pitched roof, typically anything above 10 to 12 degrees, sheds rainwater quickly by gravity and generally lasts longer with less maintenance. A flat roof (technically low-pitched, usually under 10 degrees) is common on extensions, garages, and bay windows, and relies entirely on the quality of its waterproof membrane. Neither is inherently better: the right choice depends on the building design, planning restrictions, and budget. Modern EPDM rubber flat roofs have significantly improved reliability compared to older felt systems, and a properly installed flat roof should not be seen as a second-best option.

Lead flashing fails most commonly because the mortar holding it into the masonry joint cracks and allows water to track behind it, which then enters the roof or chimney structure. Over time, lead can also crack or lift due to thermal movement, especially on south-facing elevations that see more temperature variation. A proper repair involves raking out the failed mortar joint, re-seating the lead, and pointing up with a suitable mortar or specialist leadwork sealant. Poorly fitted lead that has simply been painted over or filled with mastic is a temporary fix and will fail again.

The most common chimney problems are failed lead or mortar flashing at the base, crumbling or open mortar joints between bricks (known as spalling), and a deteriorating chimney pot or stack cap that allows water into the flue. In the Thetford area, older properties with original Victorian or Edwardian stacks often have lime mortar joints that eventually weather out and need repointing. If a chimney stack is leaning or showing horizontal cracks, that is a structural issue that needs a mason or structural engineer, not just a roofer. Even unused chimneys should be capped and their flashing maintained to prevent water damage.

Gutters should be cleared of leaves and debris at least once a year, ideally in late autumn after the leaves have fallen, and again in spring. Blocked gutters cause water to overflow onto fascias and soffits, which leads to rot in timber boards and damp in the wall below. uPVC fascias and soffits are low-maintenance but should be checked for cracks, sagging, or gaps that allow birds and vermin to enter the roof void. Timber fascias need periodic painting or treatment, and any soft or spongy sections should be replaced promptly before the rot spreads to the rafter feet.

If you have an active leak, the first priority is to contain the water indoors: place buckets, use towels, and move valuables away from the affected area. If a ceiling is bulging, keep everyone out of the room and do not poke, prod or pierce it. Do not go onto the roof or try to fit a tarpaulin yourself. Contact a local roofer as soon as possible and, if the damage is serious, notify your home insurer before any permanent repairs begin.

Ask any roofer for proof of public liability insurance before they start work, and check whether they belong to a recognised trade body such as the National Federation of Roofing Contractors (NFRC) or the Competent Roofer scheme. Get at least two or three written, itemised quotes and be cautious of any roofer who insists on a decision the same day or asks for a large cash deposit upfront. Look for local reviews on independent platforms and ask if they can point you to nearby completed work you can see. Thetford Roofers cover Thetford and the surrounding villages, so you are welcome to ask us for a no-obligation local quote and to explain exactly what any job involves before you commit.