ONLINE VERSIONSafe opening and closing of windows etc.K5.3Requirement K5.3: Safe opening and closing of windows etc. This approved document deals with the following requirement from Part K of Schedule 1 to the Building Regulations 2010. RequirementsRequirement Limits on applicationSafe opening and closing of windows etc.K5.3—Windows, skylights and ventilators which can Requirement K5.3 does not apply to dwellings.be opened by people in or about the building shall be so constructed or equipped that they may be opened, closed or adjusted safely.Performance In the Secretary of State’s view, you can meet requirement K5.3 by ensuring that people can safely operate windows, skylights and ventilators that open.Building Regulations 2010 Approved Docu Approved Docu Approved Docu Approved Document K, 2013 edition 41ONLINE VERSIONONLINE VERSIONONLINE VERSION