Since April 2002 all homes have a mandatory requirement to comply with Building Regulations ensuring adequate thermal, ventilation and safety standards.
From 2007 it was mandatory for all properties to have an Energy Performance Certificate rating A-G. This does not necessarily mean you must use double glazing, only that the window must hold a minimum rating.
As of April 2018 all private rental properties have been required to hold a minimum rating of E. All of MPS windows hold a rating of A and we can provide ratings up to A++.