Most of Beckenham's housing stock is between 80 and 130 years old. After a decade inspecting roofs across BR3, BR2 and CR0, we see the same five issues come up over and over. Here's what to look for — and what each one costs to put right.
1. Slipped or missing slates
The most common call we get. Original Welsh slate roofs from the 1880s used iron nails that have now rusted through; the slates simply slip free in a gust of wind. You'll usually notice the gap from the street before you notice the leak.
Typical cost: £180–£350 to refit or replace 3–5 slates, depending on access. Full re-nailing of a slope (re-fixing all the slates that haven't slipped yet) runs £600–£900 and buys you another 30 years.
2. Failed lead flashing
Lead flashing seals the junction between roof and chimney, parapet wall or abutment. Over decades it cracks, the lead pulls away, or pigeons strip out the mastic. Water then runs down the joint into your loft.
Telltale signs: damp patches on internal walls below a chimney; staining on the chimney breast plaster. Often misdiagnosed as a roof leak when it's actually a 30-minute flashing repair.
Typical cost: £200–£500 for a chimney re-flash. £1,200–£2,000 for full chimney remediation (re-flash plus re-pointing plus cap).
3. Blocked gutters & downpipes
If you can see plants growing out of your gutter from street level, that's the problem. London plane trees shed an enormous amount of leaf matter, and most Beckenham terraces have gutters that haven't been touched in 5+ years.
Blocked gutters cause overflow that runs down the brickwork, saturating walls and producing damp inside. Long-term, it accelerates pointing failure and freeze-thaw damage. This is the single biggest cause of damp we diagnose in Victorian terraces.
Typical cost: £80–£150 for a full gutter clear-out on a standard terrace. Annual is what we recommend.
4. Failing flat roofs over rear extensions
Three-bed terraces almost universally have a flat-roofed kitchen extension at the back. If yours has bitumen felt, and it's older than 15 years, it's at end of life — felt cracks, ponds form, water gets under.
Modern replacements are EPDM rubber (one-piece, 25-year warranty) or GRP fibreglass (seamless, 20+ year warranty). Both massively outperform felt and aren't dramatically more expensive.
Typical cost: £1,800–£3,500 for a full flat roof replacement on a standard kitchen extension. Often eligible to be invoiced through tenancy insurance if storm-related.
5. Open-jointed chimneys & loose pots
Less urgent than the others, but listed last because of safety risk — loose chimney pots are dangerous. Cement joints between bricks degrade, mortar caps crack, and the whole stack starts to lean.
If you see crumbling pointing on a chimney, or visibly tilting pots, get it looked at before winter storms. A falling pot can cause property damage and serious injury, and you carry liability.
Typical cost: £450–£900 for re-pointing and a new cap. £1,800+ for a chimney rebuild.
The pattern
Notice that four out of five of these are caught in a routine annual inspection. The fifth (gutters) needs a 20-minute clear. We see emergency callouts averaging £480 — every one of which could have been avoided by a £95 scheduled visit.
Roof problem you recognise?
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