If your roof is showing the early warning signs of failure, understanding what's causing them is the difference between a timely replacement and a costly emergency.
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A new roof is one of the most significant works you can carry out on a house, and getting it right from the start matters far more than getting it done quickly. We install new roofs on houses, extensions and outbuildings, using slates and concrete or clay tiles suited to Norfolk properties. Every job begins with a proper survey of the existing structure, not just the surface covering.
The work typically involves stripping back the old covering, inspecting and replacing any damaged roofing timbers, fitting new breathable underlay, and then laying the chosen tiles or slates with correctly sized and fixed battens. Leadwork around chimneys, valleys and abutments is replaced as part of the job, and ridge and hip tiles are re-bedded or dry-fixed depending on the specification. Guttering and fascia boards are often renewed at the same stage, since the scaffold is already up.
A new roof on a typical semi-detached house in Norfolk currently costs somewhere in the range of £6,000 to £12,000, depending on the pitch, the access difficulty, the materials chosen and the amount of timber work needed underneath. Larger detached properties or those with complex shapes, dormers or multiple chimneys sit higher. These figures are for complete replacements; a partial re-roof covering one slope runs proportionally less.
The covering you choose affects the look of the property, the weight loading on the roof structure, how long it lasts and what it costs. Understanding the differences helps you make a decision you will not regret ten years from now.
Natural slate is the most durable option available. Good quality Welsh or Spanish slate, properly fixed, can last 80 to 100 years. It is also one of the heavier coverings, so the rafters and wall plates need to be sound before it goes on. Natural slate suits older properties and those in conservation areas well, and the appearance ages attractively rather than looking tired.
Concrete interlocking tiles are a common covering on post-war housing. They are cost-effective, readily available and come in a range of profiles and colours. A concrete tile roof well laid will typically last 40 to 60 years before replacement is needed, though individual tiles may need attention sooner. They are heavier than some alternatives, but most modern roof structures are built to carry them.
Clay plain tiles sit between the two in terms of cost and character. They are a traditional choice for older Norfolk properties and suit period houses particularly well. Good clay tiles last 60 to 80 years and weather to a warm, natural tone. They are more expensive than concrete tiles upfront but the longevity and appearance often justify the difference on the right house.
When we survey a roof, we consider what the existing structure will carry, what fits the character of the building and what the planning position is, particularly on older or listed properties. We will give you a straightforward recommendation alongside the options, so you can make an informed choice rather than being steered purely on price.
This section matters most if you are already noticing something that is not quite right with your roof, because catching the problem early almost always saves money. A roof does not usually fail all at once. It tends to give clear signals over months or years before the situation becomes urgent.
Knowing what those signals mean, and what is actually causing them, helps you decide whether you need a patch repair, a more significant partial re-roof, or a full replacement. Here are the most important ones to understand.
Individual slipped or missing tiles are not automatically a sign that the whole roof needs replacing. One or two tiles displaced by wind or impact can simply be re-fixed. But when you start to see multiple tiles slipping across different areas of the roof, the cause is usually the fixing nails, not the tiles themselves.
Roofing nails in older properties were often made from iron or plain steel, and after 40 to 60 years they corrode through, leaving the tiles resting in position by gravity alone. One tiles slips, then a few, then more. This is sometimes called nail sickness, and it is a genuine structural reason to consider a full re-roof rather than continual patch repairs. Re-nailing individual tiles around a nail-sick roof is treating the symptom, not the cause.
Cracked tiles are more often caused by physical impact, thermal movement or a manufacturing fault in older concrete tiles. They can be replaced individually if the rest of the roof is sound, but if you are seeing widespread crazing or crumbling in concrete tiles, the covering has reached the end of its service life and replacement is the sensible next step.
Some moss on a roof does not mean the roof is failing. Moss grows on north-facing slopes and in sheltered spots on many perfectly sound roofs. The concern comes when the biological growth is thick, long-established and holding moisture against the tile surface for prolonged periods.
Heavy moss growth can lift the edges of tiles and slates over time, allowing water to track underneath. On concrete tiles, persistent damp accelerates the freeze-thaw cycle in winter, which causes the surface to spall and the tile to lose its structural integrity. If the tiles beneath a heavy moss covering are already porous, soft or breaking up, cleaning the moss off will not restore them. Replacement is the only proper fix.
Lichen is a better indicator of age and porosity than moss. Lichen takes years to establish and tends to colonise tiles that have become absorbent. A roof covered in lichen is worth having surveyed, because it is often a sign the tile surface has broken down enough to allow water absorption that the tile was not designed to permit.
A roof plane that looks wavy, dipped or uneven from street level is showing you something structural, not just a cosmetic problem. The possible causes include rotten or undersized rafters, a failed ridge board, deteriorated wall plates, or sarking boards that have been damaged by a long-term leak. In older properties, it can also reflect original construction using undersized timber that has deflected progressively over decades.
A sagging roof cannot be fixed by re-tiling alone. The underlying structure needs to be assessed, and in some cases strengthened or partially rebuilt before a new covering goes on. This is why a proper survey before a new roof is not a formality but a necessity. If a roofer quotes you for new tiles without going into the loft space to check the timbers, treat that quote with caution.
Standing in your loft on a bright day and seeing pinpoints of light coming through is a clear sign that the covering has gaps. In an older roof without underlay, this was sometimes considered acceptable. In a roof with felt underlay, visible daylight means the underlay has failed or the covering has shifted far enough to expose the structure to weather.
A small amount of daylight at the very edge of tiles near the eaves can be normal, but persistent daylight across a slope indicates a covering that is no longer doing its job. If you can see daylight, water can find the same route in.
Water staining on ceilings or walls does not always trace directly back to the point where the roof is letting in water. Rainwater can travel along rafters, sarking boards or underlay for some distance before dropping. A damp patch in the corner of a bedroom ceiling might come from a failed flashing at a chimney stack five feet away, or from a failed valley gutter on the far side of the stack.
A common problem is a failed mortar fillet at a chimney or a parapet abutment. The mortar dries out, shrinks and cracks over years, and rainwater tracks behind the adjacent tiles or slates. The repair looks small but the water damage it has caused can be extensive by the time it is noticed inside the house. Where damp has been getting in for a prolonged period, the timbers immediately below that entry point need to be checked for rot before a new covering is laid.
Lead flashings around chimneys, at abutments and in valleys have a finite life, though good quality lead correctly installed can last many decades. The failures to watch for are open joints in step flashings, lifting or corroded soakers behind chimney stacks, and cracked mortar pointing on chimney caps allowing water down the flue and into the stack.
Some properties have chimney stacks that are no longer in use but remain on the roof. An unused stack with failing flashings or a damaged cap is a significant leak risk. If you have redundant chimneys, discussing whether to repair, reduce or remove them is worth doing as part of a re-roofing project, since the scaffold is already in place and the work is much more economical when combined.
Many homes have a flat or shallow-pitched felt roof over a rear extension, lean-to or garage. Traditional mineral felt has a lifespan of around 10 to 15 years before it starts to crack and blister. When it fails, it tends to fail progressively across the whole surface rather than in one spot.
Modern flat roof systems using EPDM rubber membrane last significantly longer than traditional felt and are better suited to the temperature extremes that a flat surface is exposed to. If the flat roof on your extension is already showing blisters, splits or ponding water, a survey will tell you whether it needs full replacement or targeted repair. Patching an old felt roof that has generally deteriorated rarely pays for itself.
Understanding the cause behind the warning sign helps you ask the right questions when getting quotes and helps you recognise a proper diagnosis when you hear one. Most roof failures come from one of a handful of root causes.
Age and material degradation. Every roofing material has a service life. Concrete tiles can be at or beyond that life on older properties. The issue is not just surface weathering but the internal structure of the tile, which becomes more porous and less frost-resistant as it ages. Once a tile is regularly absorbing water, freeze-thaw cycles in cold winters do progressive damage.
Inadequate original specification. Some roofs were built to a price rather than a standard. Undersized battens, incorrect tile laps, missing soakers, pointing applied directly to step flashings instead of proper lead work, and underlay laid without sufficient overlap are all original specification failures that create problems years later. If a roof is failing well before its materials' expected lifespan, the cause is often in how it was originally built.
Lack of ventilation. A poorly ventilated roof space allows condensation to form on the underside of the felt or directly on the timbers. Over years, this leads to wet rot in rafters and ridge boards, and in severe cases the underlay itself breaks down. Current building regulations require specific levels of ventilation in new roofs, and adding adequate ventilation when re-roofing an older property is both good practice and a requirement for compliant work.
Deferred maintenance. A single slipped tile that is not replaced allows water in at one point. That water wets the timbers, begins a rot patch and tracks along the underlay to a second low point. What started as a £50 repair becomes a £500 repair, then a structural repair. The pattern repeats and accelerates until the accumulated damage makes full replacement the only economic option. Early intervention on individual repairs is nearly always less expensive than waiting.
Any quote for a new roof should be based on a physical inspection, not a measurement taken from street level and a guess at what is underneath. The roofer should be in your loft space checking the condition of the rafters, the ridge board, the wall plates and the underlay. They should be on the roof itself to assess the condition of flashings, ridge tiles, valley gutters and individual tile areas.
A written quote should itemise the work clearly: stripping the old covering, disposing of waste, the extent of any timber work, the underlay specification, the tile or slate type and profile, the ridge and hip detail, and the leadwork involved. If a quote does not itemise these things, ask for a breakdown before you sign anything.
If you are getting multiple quotes, make sure they are for the same specification. A quote that appears lower may be based on a thinner underlay, a different tile, or no allowance for the timber repairs that a proper survey would identify as necessary.
A straightforward like-for-like replacement of the same covering on a standard house generally does not need planning permission. However, if the property is listed, in a conservation area, or if you are changing the material or the profile significantly, you should check with the local authority before work starts.
Building regulations do apply to re-roofing work where it constitutes a material alteration. In practice this means the finished roof must meet current standards for ventilation, thermal performance and structural adequacy. A competent roofer will be aware of these requirements and build them into the specification. Ask specifically how ventilation is being provided and what insulation, if any, is included in the specification.
We cover Attleborough and the surrounding area from our base in Dereham. If your roof is showing any of the warning signs described on this page, the right next step is a proper survey so you know exactly what you are dealing with before committing to any expenditure.
Call us to arrange a roof survey and written quote. We will assess the structure and the covering, tell you honestly what needs doing and give you a clear, itemised price.
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Call any time. Calls are answered day and night and passed straight to our roofers.
