Gutters are the cheapest maintenance a house has and among the most expensive to neglect, because what a blocked gutter damages is rarely the gutter. In an Irish climate — mild, wet, and rarely dry for long enough for anything to fully dry out — they fill faster than in most of Europe and they matter more.
How often, honestly
Once a year suits most houses. The useful timing is late autumn, once the leaves are actually down rather than halfway through — clearing in September means doing it again in November. Late November into December is usually the sweet spot, and it puts the run in good order before the wettest months.
Twice a year earns its place in specific circumstances, and it is worth being clear that these are circumstances rather than a default:
- Mature deciduous trees close enough that leaves land on the roof rather than the garden.
- A roof carrying significant moss, which sheds continuously into the gutter all year and silts a run up in a way leaves do not.
- Conifers or evergreens nearby, which drop needles steadily rather than seasonally.
- A gutter with a shallow fall, which silts rather than draining, so fine material stays put instead of washing through to the downpipe.
- Box gutters, valley gutters and anything internal, where a blockage overflows into the building rather than off the side of it.
Every two years is defensible on a modern house with no trees near it, a steep roof, and no moss. It is not the common case in Ireland, but it exists, and a company that tells you your gutters need doing annually without looking at the roof is guessing.
Signs it is already blocked
All of these are visible from the ground, and all of them mean the run is not working:
- Water over the front edge in heavy rain. The clearest sign, and worth looking for deliberately — stand outside during a downpour once a year and watch the roofline.
- A dry downpipe while the gutter is visibly full. The blockage is at the outlet or in the pipe itself, which is a different job from clearing the run.
- A vertical stain or green streak on the wall below one point of the gutter. That is where it has been overflowing, probably for some time.
- Plants growing out of the gutter. Seeds need soil, so there is enough silt up there to hold roots.
- Water running behind the gutter and marking the fascia rather than falling clear of the wall. This is the one to act on quickly, because it is wetting timber rather than masonry.
- Sagging between brackets, which means the run is carrying weight it was not designed for — wet debris is heavy.
What ignoring it costs
The gutter itself is rarely the casualty. Water going over the front edge runs down the wall, and on render or masonry that means saturation, staining, and eventually damp reaching the inside face — which presents as an interior problem and gets treated as one, sometimes for years, while the cause sits outside at roof level.
Water going over the back edge is worse, because it gets behind the fascia into the soffit and onto the roof timbers. Timber that stays wet does not recover on its own, and by the time it is visible the repair is carpentry rather than cleaning.
Set against either, an annual gutter clear is trivial. That asymmetry — a small predictable cost against a large unpredictable one — is the whole argument, and it does not need any exaggeration to work.
Doing it yourself
On a single-storey extension or a garage, with a stable ladder on firm level ground and someone else in the house, this is a reasonable job to do yourself. Scoop rather than flush, bag what comes out, and check the downpipe runs afterwards.
At two storeys the calculation changes, and not because of the cleaning. Ladder falls are among the most common serious domestic accidents, and the specific risk here is structural: a ladder leaned against a plastic gutter distorts it, and a distorted run loses its fall — which is what causes the next blockage. Ladder feet on a flowerbed, a sloped path or a conservatory roof create their own problems.
Vacuum systems reach a normal two-storey roofline from the ground, which is why this work has largely moved off ladders in the last decade — nothing rests against the gutter, nothing is dropped onto the path, and the inside of the run can be seen on camera rather than guessed at.