The honest answer is twice a year for most Dublin houses. But that's an average, and averages are no use if you live under a line of lime trees.
The short answer
For a typical Dublin semi with no large trees overhanging the roof, once a year in late autumn is usually enough. Add a second clean in late spring if any of the following apply:
- Mature trees within about fifteen metres of the house
- A north-facing roof that holds moss
- Any gutter run that has overflowed in the last two years
- A flat or shallow-pitched section that drains slowly
Houses on heavily planted roads — Rathgar, Clontarf, Mount Merrion, Castleknock — routinely need two cleans. Newer estates on open ground often manage on one.
Why autumn matters more than spring
Leaf fall is the obvious reason, but it's not the main one. The real damage happens when a gutter full of wet leaf sits through a Dublin winter. The debris holds water against the fascia board, the timber softens, and by spring you have a rot problem rather than a blockage problem.
Clearing in November, once the trees are bare, empties the gutter before the wet months do the harm. Clearing in March cleans up what the winter blew in.
The signs you've left it too long
You don't need to get on a ladder to know. Watch for:
- Water spilling over the front edge during rain — the classic sign of a blockage or a lost fall
- Staining down the wall beneath a joint or a gutter end
- Plants growing in the gutter — if something has rooted, there is soil up there
- Water running behind the gutter rather than out of the downpipe
- Damp patches inside on an upstairs wall or ceiling near the eaves
The last one means it has already stopped being a gutter problem.
What it costs to leave it
A gutter clean is a modest job. The things a blocked gutter causes are not. Rotten fascia and soffit, damp penetrating a wall, and in the worst cases water tracking into a ceiling — all of them cost multiples of what the clean would have.
That is the whole argument for doing it on a schedule rather than waiting for a symptom.
Doing it yourself
If your house is a bungalow and you are comfortable and steady on a ladder, clearing your own gutters is reasonable. Wear gloves, work from a properly footed ladder, never lean sideways, and flush the downpipe with a hose when you have finished so you know it runs.
On a two-storey house — or anything with a steep roof, an awkward return, or no flat ground for a ladder — it is not worth the risk. That is most of what we get called to.