Irish autumn arrives quickly. One week you're getting away with leaving the back door open; the next, the rain is horizontal and the wind is pulling at the fascia boards. If you want to avoid cold-weather surprises, the last week of September and the first two weeks of October are the window to work with. After that, you're often firefighting.
Here's what to work through before the wet season properly sets in.
Gutters and downpipes
This is the one most people skip and then regret. Gutters clog with leaves, moss, and general roof debris over the summer. Once autumn rain starts in earnest, a blocked gutter overflows against the fascia, soaks into the soffit, and eventually finds its way into the wall cavity. Clear them out, check the brackets are still holding firm, and run water through the downpipes to confirm they're flowing freely at the bottom. If a downpipe empties straight onto a path or patio, make sure the drain below it isn't silted up.
Roof check
You don't need to go up there yourself. A pair of binoculars from the garden will show you lifted, slipped or missing slates. Check the ridge tiles too. Mortar on ridge tiles deteriorates over time and an Irish winter will pull loose mortar out completely. Flashing around chimney stacks and roof windows is worth looking at closely. A small gap in the flashing is genuinely one of the more common sources of internal damp that people spend months misdiagnosing. If you're weighing up a bigger roofing decision alongside this, the differences between flat and pitched roof options are worth understanding before you call anyone in.
Boiler and heating system
Get the boiler serviced in September if you can, not November. Every plumber and heating engineer in the country is booked solid once the cold snap hits. A service typically takes an hour or two, costs somewhere in the region of eighty to a hundred and twenty euro depending on where you are, and gives you the winter with a bit more confidence. Bleed the radiators while you're at it. It takes twenty minutes and a radiator key and makes a real difference to how evenly heat distributes through the house.
External joinery
Timber windows and external doors need attention before the rain arrives. Check the paintwork and sealant around frames. Cracked or peeling paint lets moisture into the wood grain, and once timber starts to rot, it moves fast in a wet Irish winter. If the sealant around a window frame has shrunk or split, a tube of appropriate exterior sealant and an hour of your time will save you a much bigger job in spring. Check that all external doors are closing and latching properly. Timber swells and shrinks seasonally and a door that jammed in August might actually close fine now, but hinges and frames are worth a look regardless.
Timing outdoor work around the forecast
If you're planning any outdoor painting, sealant work, or roof repairs, you need a dry spell of at least two or three days. Met Éireann's forecasts and rainfall data are genuinely useful for planning this, particularly if you're in a wetter county on the west coast where the window between dry days can be short. Most tradespeople will tell you the same thing: don't push outdoor work in iffy weather. The finish suffers and you often end up redoing it anyway.
If you do need to bring in a tradesperson for any of this, take your time choosing one. Autumn is busy and corners get cut. Vetting a trades person properly before you hand over a deposit is worth the extra few days it takes.