Existing Building Energy Compliance & Certification | Low Energy Consultancy

Existing Building Energy Compliance & Certification

EPCs, DECs, TM44s - lots of acronyms, but what exactly do they stand for and do you need this type of certification for your building?


EPC stands for Energy Performance Certificate, this certificate demonstrates to prospective buyers or tenants the energy performance of the building and the potential if improvements are made. In 2008 it become a legal requirement to gain an EPC prior to selling/renting your property. There are some building exemptions which include listed buildings, places of worship, temporary buildings (to be used for less than 2 years) - all exemptions are visible here.

On 1st April 2018, MEES (Minimum Energy Efficiency Standards) legislation was introduced which prevents all new domestic & commercial leases being agreed without the building meeting a minimum EPC energy rating of E and above. In 2020 the law changes to include existing tenancy agreements for domestic properties and again in 2023 to include existing commercial tenancy agreements. Again, there are some exemptions, all of which require registering within the PRS exemption register - further details of MEES and future changes including dates are available here.


DEC stands for Display Energy Certificate, this certificate showcases the energy usage of a public building and it is based upon actual data. Buildings that require DECs to be displayed are buildings which are at least part occupied by a public authority, has a total floor area of 250m2 and it is frequently visited by the public. The DEC is to be displayed in a clear and visible area of the building - recommended within the reception or near the front entrance, if it is not displayed fines of £500 can be issued. If the building has a total floor area of 1000m2 and above the DEC lasts for 1 year, for buildings with a total floor area of between 250m2 and 1000m2 the DEC lasts for 10 years. More information is available here

Whilst it is not mandatory, a private business can opt to display a voluntary DEC and in Scotland Public Buildings are required to have an EPC rather than a DEC.


A TM44 inspection is an inspection of an air conditioning system. This inspection is required for all air conditioning systems over 12kW and TM44 relates to the clause within CIBSE guidance. The inspection is designed to to improve efficiency, reduce energy consumption, operating costs and the carbon footprint. Inspections must be no more than 5 years apart. Trading Standards police compliance and if you fail to provide an inspection record upon request you can be fined from £300 per offence, further penalties can follow. more information is available here

All of the above inspections and surveys need to be completed by an accredited energy assessor. If you have a requirement for any of the above contact Nicola Scott on 020 3859 4100 or nicola.scott@lowenergyconsultancy.co.uk