Keep food covered, and preferably in the fridge.
Wrap rubbish well and dispose in sealed bags. Keep lids on bins and away from windows.
Keep sink wastes and drains clean and clear.
Clean up food spills and crumbs immediately.
Vacuum regularly, including under and behind furniture.
Clean up after pets.
Turn out kitchen cupboards every few months to check for food moths.
Keep gutters and chimneys clear to prevent birds nesting and insects breeding.