Check and repair pergolas, arbours and arches if needed.
Use a stiff-bristled brush or pressure washer to remove algae from paths. Pressure washers can be rented if necessary. Remove dirt and algae from walls, paving and patios too - it's easier at this time of year before too much has grown.
In dry spells, you can treat timber structures with wood preservative and stain. Only do this in a well-ventilated space, to reduce the risks to your lungs and eyes. Make sure you use appropriate products. Creosote, for example, is no longer legal.
Go through your shed and remove old or out of date garden chemicals. If in doubt of how to dispose of them, your local authority tip should be able to help.
Get ready for some summer relaxation by installing decking or other seating areas in the garden.