A few slipped tiles after a storm rarely means you need a whole new roof, but persistent leaks and sagging timbers are a different story. Knowing which side of the line your roof sits on can save you thousands of pounds, or stop you wasting money patching something that is past saving. Here is how we assess it on jobs around Shirley, Croydon and the wider South East London area.
Age is the single biggest factor. A concrete or clay tiled roof typically lasts 50 to 60 years, natural slate can go 80 to 100, and felt flat roofs often fail within 15 to 20. Much of the housing stock around Shirley and Croydon is 1930s semis, so plenty of original roofs are now on borrowed time even if they look fine from the pavement.
If your pitched roof is under 30 years old and the problem is localised, a repair is almost always the right call. If it is 60 plus years old and problems keep cropping up in different places, you are usually paying to patch a roof that will need replacing soon anyway.
Most roof problems are local, caused by weather, blocked gutters or failed pointing rather than the roof as a whole giving up. If the damage is confined to one area and the surrounding tiles and timbers are sound, a repair is the sensible, cheaper option.
As a rough guide, replacing a handful of slipped or cracked tiles might cost 150 to 400 pounds, repointing a ridge a few hundred, and renewing flashing around a chimney typically 200 to 500 pounds depending on access. Scaffolding, if needed, can add to that.
Some symptoms point to the roof failing as a system rather than in one spot. A visible sag in the roofline usually means the timbers or battens underneath have weakened, and no amount of tile swapping fixes that. Daylight visible from inside the loft, widespread damp staining on the felt or rafters, or tiles that crumble when handled all suggest the covering has reached the end of its life.
Another telltale is repair fatigue. If you have paid for two or three separate repairs in the last few years and leaks keep appearing in new places, the money is better put towards replacement. A full reroof on a typical three bed semi in this area generally runs from around 6,000 to 12,000 pounds depending on the size, tile choice and whether timbers need work, so it is not a decision to rush, but endless patching can quietly cost you a good chunk of that anyway.
You can learn a lot without setting foot on a ladder. From the pavement or garden, look along the ridge for dips, scan for missing or misaligned tiles, and check the gutters after rain for overflowing or sludge. Binoculars help. Inside, go up into the loft on a bright day with the light off and look for pinpricks of daylight, then check the felt and timbers for staining, damp patches or a musty smell.
What you should not do is walk on the roof yourself. Tiles crack underfoot, and on older roofs the battens may not take your weight. Any decent local roofer will inspect properly, usually free of charge, and photograph what they find so you can see the evidence rather than take their word for it. Be wary of anyone who quotes for a full replacement without getting up there or showing you photos.
If the damage covers less than about a quarter of the roof and the structure underneath is sound, repair it. If more than that is affected, the roof is near the end of its expected lifespan, or the deck and timbers are compromised, replacement is usually better value over ten years even though it costs more today.
There is a middle option too. If one slope is failing but the rest is sound, a partial reroof of that elevation can make sense, particularly on older semis where the south facing side has weathered harder. A proper inspection will tell you which camp your roof falls into, and a written report or photos give you something to compare quotes against.
A properly done tile or flashing repair on a sound roof should last as long as the surrounding roof, often decades. If repairs keep failing within a year or two, that is a sign the roof itself is the problem, not the workmanship.
Most policies cover sudden storm damage, such as tiles ripped off in high winds, but not wear and tear or gradual deterioration. Photograph the damage promptly and get a written assessment, as insurers usually want evidence of a specific weather event.
Usually not, as like for like replacement falls under permitted development. However, reroofing must comply with Building Regulations, which typically means upgrading loft insulation at the same time, and homes in conservation areas may face restrictions on changing tile type.
Tell us about the job and we will get a quote back to you, most days the same day.