When your roof in Cottenham has reached the end of its life, a full replacement is the most reliable way to protect your home for the long term.
Most roofs do not fail overnight. The signs tend to build gradually: slipped or missing tiles that keep coming back, flashing that lifts away from the chimney stack every winter, or damp patches on a top-floor ceiling that reappear no matter how many times the repair is patched. At some point, the honest answer is that the roof itself is the problem, not any single weak spot within it.
A full replacement makes sense when the tile or slate bedding has broken down across large sections, when the underlying felt has perished and is letting water track sideways rather than drain cleanly, or when the timber structure beneath has softened from years of slow ingress. Continuing to repair a roof in that condition costs money repeatedly without ever solving the problem.
The work starts with scaffolding erected around the property. Safe access is not optional, and any roofer who suggests working from ladders alone on a full re-roof is cutting a corner that matters. Once the scaffold is up, the existing tiles, slates or felt are stripped back completely so we can inspect the roof deck and timbers underneath.
Any damaged or soft timber is cut out and replaced before anything else goes on. New breathable roofing membrane is laid across the deck, battens are fixed to the correct gauge for the chosen tile or slate size, and then the new covering goes on from the eaves upward. Ridge and hip tiles are bedded or dry-fixed, all lead flashing around chimneys, valleys and abutments is dressed and sealed, and the scaffold comes down once everything has been checked.
Larger or more complex roofs, including those with multiple hips, valleys or dormers, will take longer than a straightforward pitch.
Concrete interlocking tiles are the most common choice for a replacement on a modern or interwar pitched roof. They are durable, widely available and straightforward to match if you need isolated repairs in the future. Natural slate is heavier and requires closer batten spacing and a roof structure in good enough condition to carry the weight, but it has a longer serviceable life and a cleaner appearance that suits many older properties.
Fibre-cement slates sit between the two: lighter than natural slate, more uniform in appearance, and available in a range of colours. For listed buildings or properties in conservation areas, the local planning authority will have requirements about what materials are acceptable, so it is worth checking before you commit to anything.
A full tile replacement on a typical three-bedroom semi in this area generally costs between £6,000 and £12,000 depending on the size of the roof, the material chosen, and the extent of any timber or fascia work required. Natural slate pushes costs toward the upper end of that range and beyond for larger roofs.
Flat or low-pitched sections, common on rear extensions and bay window tops, are replaced differently. Traditional felt systems use layers of bonded bitumen felt, but EPDM rubber membrane has become a more reliable choice for many situations. EPDM is a single-layer synthetic rubber sheet that bonds to the deck, handles movement in the substrate well, and is not prone to the blistering and cracking that older felt systems develop over time. A flat roof replacement in EPDM on a typical rear extension costs roughly £70 to £120 per square metre installed.
A roof replacement is the natural point to look at the fascias, soffits and guttering as well. The scaffold is already in place, access is straightforward, and the old fascia board is usually removed anyway to allow the new felt to be dressed correctly at the eaves. Replacing softwood fascias and soffits with uPVC at the same time avoids a separate scaffold hire later and leaves the whole roofline in good order.
Guttering should be checked for falls, joint integrity and capacity. Undersized or poorly pitched guttering causes water to back up against the fascia, which is one of the more common routes for damp to get into a roof structure from the outside.
Chimneys are among the most vulnerable parts of any pitched roof. The stepped and cover flashing around the base of a stack is usually lead, and it needs to be fully recut and dressed as part of a replacement rather than simply reused. Old lead work that has been patched with mortar or sealant rarely lasts, and a chimney left with compromised flashing will be the first place water re-enters after a new roof goes on.
If the chimney itself is in poor condition, with loose pointing, spalled brickwork or a cracked pot, it is worth having the stack inspected and repointed at the same time. This is straightforward to do while the scaffold is standing.
This is the section most homeowners skip, and it is the one that most directly affects how long a new roof stays trouble-free. A replacement is a significant investment, and a small amount of attention in the years that follow will prevent the problems that typically cause early call-outs.
Blocked gutters are the single most avoidable cause of early roofline deterioration. Leaves and debris accumulate fastest in autumn, and if water cannot drain freely it sits against the fascia, forces back under the felt at the eaves, and eventually causes damp in the top of the wall or ceiling. Clear gutters at least once a year in late autumn, and again in spring if there are trees close to the roof.
While you are clearing the gutters, run water along the length of each section to check it drains to the downpipe without pooling. A gutter that holds standing water has either lost its fall or has a partial blockage further along.
You do not need to get on the roof yourself to check it after a storm. A pair of binoculars from ground level will show you whether any ridge tiles have shifted, whether a tile has slipped out of line, or whether anything obvious has changed. Catching a single slipped tile early costs very little to fix. Leaving it through a wet winter allows water to get under the surrounding tiles and into the felt beneath, which is when the repair bill climbs.
Do this check after any period of severe wind. A single displaced tile is a straightforward repair; the damage that follows from water ingress over months is not.
Moss and lichen appear on most pitched roofs within a few years. This is normal, and it is not a structural problem. A thin covering of moss does not damage concrete tiles or slate beneath it. Pressure washing, on the other hand, strips the surface coating from concrete tiles, forces water up under slates, and dislodges pointing from ridge tiles. It causes more damage than it prevents.
If moss is a concern, a qualified roofer can apply a biocide treatment from the scaffold during the next visit for another job. This kills the growth without damaging the tile surface. Avoid contractors who approach householders offering to clean roofs from ladders with pressure washers.
Between checks, the inside of the house tells you things the roof surface cannot. A new damp patch on a top-floor ceiling, a musty smell in the loft, or frost on the underside of the felt in winter are all signs worth acting on promptly. The cost of a call-out to fix a minor issue is a fraction of the cost of leaving it to develop.
Check the loft space yourself after prolonged heavy rain. Bring a torch and look for any daylight visible through the felt or around the chimney stack, any wet timber, or any staining on the rafters. These are the early signs that something needs attention before it becomes a bigger job.
Concrete tiles and natural slate are not designed to be walked on directly. Foot traffic cracks tiles, displaces slates and damages the lap between courses. If something needs to be inspected or repaired at height, use a qualified roofer with the correct access equipment. A broken tile caused by a poorly placed foot can let water in just as effectively as storm damage.
Keep a record of the work done, what materials were used, and when the replacement was completed. This is useful when selling the property, and it helps any roofer who carries out future work to understand what is already in place. If the tile manufacturer provides a product datasheet, keep that too.
We carry out roof replacements in Cottenham and the surrounding villages, including work in nearby Waterbeach, Soham and across to the Newmarket area. If you are not sure whether your roof needs a full replacement or whether a targeted repair would see it right, call us and we can arrange a roof survey so you have a clear picture before committing to anything.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
