How to fit wall shelves
Shelves are a brilliant and low cost storage solution, so we've put together a fitting guide to answer all your DIY shelf-related questions
To make the shelf even stronger you could also fit a batten along the back wall for the shelf to rest on.
If you need to secure the shelf to the batten too, mark and drill the holes before fixing the batten to the wall.
Find these instructions plus lots more handy guides, in 300 Tips, Techniques & Trade Secrets for Painting and Decorating by Alison Jenkins, published by Apple Press.