Water Keeps Receipts: Reading Your Gutters From the Ground Before the Rain Settles

The most useful gutter inspection you will ever do involves no ladder, no gloves and no nerve. It involves a coat, a bit of patience, and a slow lap of the house while it is raining.

By November the leaves are down and the first proper weather has arrived. This is the ideal window to find out what your rainwater system has been quietly doing all autumn, because a gutter does not fail dramatically. It fails politely, in small increments, over several years, while staining your paintwork and soaking your wall.

Walk it in the rain

Stand back a few metres and work your way round. Watch where the water goes when the flow is steady rather than torrential. Take a phone and photograph anything that looks wrong, because these things are hard to describe accurately to a tradesperson later.

Then walk it again dry, looking at the fascia boards, the render below, the ground at the base of the wall and the state of the downpipe outlets. Two passes, ten minutes each.

Water going over the front edge

If water sheets over the lip mid-run, the gutter is not doing its job. Usually that means a blockage where the water wants to go, so the channel fills behind it and spills at the lowest point. Sometimes it means the run has lost its fall and water is sitting in a sag rather than heading for the outlet. Occasionally it means the gutter is undersized for the roof area, particularly where a conservatory or extension has been added and nobody recalculated.

Clear it first. If it still overflows when clean, the brackets need adjusting to restore a gentle fall towards the downpipe. That is a modest job, but it needs doing properly.

Overflow at one joint while the rest looks clear

A single wet joint on an otherwise clean run usually means the seal has perished, or the bracket nearest it has dropped, creating a small low point. Plastic gutter seals harden with age and UV. This is one of the cheapest things on a house to put right, and one of the most expensive to ignore.

Brown streaks and tiger stripes down the fascia

Those dark vertical marks running down the timber behind the gutter are water that has been going the wrong way, usually behind the gutter rather than in it. Look closely at the bracket line: a gap between the gutter and the fascia, or fixings that have pulled loose, tells you the whole story.

Fascia staining is a warning about the timber itself. A bit of discolouration is cosmetic. Soft, crumbly timber with flaking paint is not, and by the time a fascia board rots through, the rafter ends behind it are often in the conversation too.

A damp patch on the wall below the eaves

This is the point where a ground-level observation becomes a reason to act quickly. A damp smear on render or brickwork below a gutter joint, or a fresh stain on a ceiling near an external wall, means water is finding a path into the structure.

It might be nothing more than a leaking joint sitting directly above that spot. It might be a failed flashing where a roof meets a wall or chimney. Both are worth investigating before the wet season gets properly underway, and neither gets better with time.

Gravel splash and a soft base to the wall

Look at the ground where the downpipe discharges. Water should enter a gully, a shoe leading to a drain, or a proper soakaway, not simply be dropped against the wall.

If you can see washed-out gravel, a hollow in the soil, or splashed mud on the lower courses, the downpipe is dumping water at the base of the building. That splashback erodes pointing, keeps the wall permanently damp, and in older properties can work its way towards the footings. A simple shoe or a length of pipe to redirect the flow solves a lot of it, provided the drain itself is clear.

Nothing coming out at the bottom

A downpipe with no water leaving it in the middle of a downpour is blocked, and the blockage is usually a compacted plug of leaves and grit somewhere in the bend or at the shoe. Do not attack it from the top with a broom handle and force, because old plastic pipe splits easily and you will then be buying a new downpipe as well.

If a gentle clear-out with a drain rod does not work, stop. A drainage specialist with proper rods or a CCTV survey will find the problem and charge you somewhere in the region of £200 to £400 for the survey, which is cheaper than digging blind.

Green growth and a slightly crooked line

Moss, grass and the occasional buddleia seedling sprouting from a gutter are signs of silt that has been there for years. Step back and look along the run: a straight edge is what you want. A gutter that dips, hangs or has visibly pulled away from the fascia is holding several kilos of wet debris it was never designed to carry.

What a November clear-out is actually worth

A straightforward clear-out of gutters and downpipes typically runs £80 to £200 for a semi-detached house in 2026, more if access is awkward or the property is tall. Compare that with the numbers on the other side of the ledger: a replacement gutter run installed is broadly £40 to £70 per metre, fascia replacement £50 to £90 per metre, and remedial work for damp that has reached the interior is open-ended.

Gutter guards divide opinion. They reduce leaf ingress but trap fine grit and moss, and a badly fitted guard makes clearing harder. If you have heavy tree cover, regular clearing is usually the more reliable answer.

When the ladder should stay in the shed

Do not climb for a two-storey house, a difficult slope, a conservatory roof in the way, or anything involving power cables. Working at height is regulated for good reason, and a fall from gutter height is a life-changing event rather than an inconvenience.

If you do tackle a single-storey run yourself, use a ladder at the correct angle, secured, with three points of contact, never leaning against the gutter itself, and never in wind or when the surface is wet. Telescopic gutter-cleaning tools that work from the ground exist and are a sensible compromise for many people.

The last thing worth doing is writing it down: the date of the clear-out, what you spotted, what you fixed. Next November, when a stain reappears in the same place, you will know immediately whether it is new or whether it has been there since 2026 and quietly getting worse.