The £300 job that prevents the £25,000 one

After years of cleaning and maintaining residential blocks for managing agents across London and the South East, we've noticed that the most expensive problems on an estate almost never start as big problems. They start as small, boring ones that were easy to defer. And no example is more common — or more avoidable — than the blocked gutter.

How £300 becomes £25,000

A blocked gutter doesn't fail loudly. There's no alarm, no leak into a hallway, no phone call. It simply redirects every rainfall down one strip of wall, month after month.

That wall saturates. Saturated render and brickwork grow algae, which holds yet more moisture against the surface. Then winter arrives, and the physics take over: water trapped in hairline cracks freezes and expands by roughly nine per cent, widening every crack it sits in. Each cold snap pushes a little further. By spring, the elevation has spalled brick faces, blown render and failed paint — and by the time damp finally shows inside a flat, the schedule of works has grown to damp remediation, external repairs and internal redecoration.

The escalation is remarkably consistent. As indicative figures for a single elevation:

• Annual gutter and gully clearance: a few hundred pounds a year — around £300 on a typical block.

• Repairing overflow and fascia damage: around £1,500.

• Damp treatment and external repairs: around £8,000.

• Blown render, internal redecoration — and a Section 20 consultation: £25,000 and beyond.

Every building is different and the exact numbers vary. The shape of the curve doesn't: each stage left unaddressed costs roughly five to ten times the one before it.

The Section 20 problem

For managing agents, the final stage carries a sting beyond the invoice. Planned, routine maintenance is budgetable within the service charge: leaseholders see a smooth, predictable cost year after year. Reactive failure is the opposite — a sudden, five-figure item that can trigger statutory consultation, awkward AGM questions and precisely the kind of correspondence nobody enjoys.

Put bluntly: planned care is boring on a graph. Boring is the goal. Your leaseholders will never thank you for the graph staying flat — but they will absolutely notice when it doesn't.

Three things worth doing this quarter

• Find your gutter records. For every block: when were the gutters and gullies last cleared, and with what evidence? If there's no record, a camera survey is the cheapest insurance in property management.

• Look up, on your next walk-round. Green staining below a gutter line or window sills is water announcing itself. Green means early; black lichen means it has been years.

• Ask for photographic evidence. Whoever clears your gutters should hand you before-and-after photos for your files — it turns an invisible job into board-ready proof that the service charge is working.

None of this is glamorous, and that is rather the point. The best maintenance stories are the ones that never become stories at all.

Luca Bertagna, Director, Simple Clean