All ladders and steps should be properly maintained and regularly checked for defects. If any problems are identified, then that ladder should be taken out of use immediately.
During a routine inspection of ladders you should look for:
Train employees and volunteers in the safe use of ladders
You will also need to consider The Work at Height Regulations for any such work being undertaken. If you are an employer or you control work at height (for example building owners who may contract others to work at height) the Regulations apply to you.
For more information look at the HSE guidance on working at height.
See the HSE's guidance notes on the safe use of ladders and stepladders.