A permanent mortice deadlock or mortice sash lock that conforms to BS 3621:2007 can be used where the door is at least 44mm thick and is locked to the doorframe. Alternatively a ‘sold secure’ Silver Standard padlock with a hasp and staple that are coach bolted through the structure is deemed compliant.

Where communal cycle storage will be provided within a block of flats, the entrance must be a secure doorset and meet the requirements of clauses 21.2 to 21.6 and 21.8 to 21.13 of the ‘Secured by Design New Homes 2010’ document. Note that this room should have no windows.

"Code for Sustainable Homes Technical Guide November 2010"