If there’s one feature you can introduce to your garden to help wildlife; it’s a pond. Almost regardless of how large a patch you have, introducing a bit of still water absolutely transforms your garden in terms of its value to living things.
One of the things you should be thinking about is making sure all creatures have access to the water resource. Make sure there are sloping banks. Make sure it’s not steep sided with nasty steep bricks to stop things getting in, or more importantly out. If a hedgehog falls into a pond and it can’t escape then it is going to drown. It’s got to be a place where creatures from the land can come and drink.
All wildlife habitats should be checked annually for any damage or deterioration. Re-paint with water-based paints, tighten loose fixings or make repairs as necessary to keep the habitat in safe and well-maintained condition, as you would your own home space. Clean out bird houses in Autumn and clean & sterilise bird feeders, tables and bird baths regularly to maintain good bird hygiene.