The clearest signs a roof is failing are water stains on upstairs ceilings, slipped or missing tiles, daylight in the loft, and repairs that keep coming back. One on its own might just need a repair. Several together usually mean it’s cheaper to re-roof than to keep patching.

The signs worth acting on

Watch for damp patches or staining on top-floor ceilings; slipped, cracked or missing slates and tiles; a roofline that visibly sags; failed flashing or mortar around chimneys and valleys; daylight through the boards when you’re up in the loft; granules from worn felt collecting in the gutters; moss and plant growth holding moisture against the covering; a cold top floor and creeping heating bills; repairs that keep recurring in the same spots; and a roof that’s simply reached the end of its life for its material.

On lifespan, natural slate can last 80 to 100 years or more, clay tiles 60-plus, and concrete tiles roughly 40 to 60. The catch is that the flashings and the felt underneath usually fail well before the covering does, which is why a roof can leak long before it looks worn out.

Repair or replace?

A handful of slipped tiles is a repair. Widespread slipping, sagging, failed felt, or damp in more than one place is usually the point where re-roofing costs less over time than chasing leaks around the roof. We’ll tell you honestly which side of that line you’re on after an inspection rather than talk you into the bigger job. The roofing services page covers what we do.

What it costs

As a guide, replacing the roof on a typical house runs from several thousand pounds into the low tens of thousands, depending on size, pitch, material and access, with natural slate and heritage work at the higher end. There’s no useful flat rate here, so every roof is priced after an inspection.

Do you need permission to re-roof?

Usually not. Re-roofing that doesn’t materially change the roof’s appearance is normally permitted development, provided those rights haven’t been removed from your property. The exceptions matter, though: in conservation areas and areas of outstanding natural beauty, roof alterations aren’t permitted development; listed buildings need listed building consent for changes to the roof; and re-roofing generally needs Building Regulations approval either way. So a like-for-like slate roof in Watford is straightforward, while reshaping a roof on a listed home is not.

Worried about your roof in Watford or Richmond? Book an inspection and we’ll give you a straight answer on repair versus replace.