Non-domestic buildings are all buildings that do not fall into the category of buildings solely for residential use (see Domestic EPCs).
There is a legal requirement for EPCs to be provided on the sale, letting or construction of buildings other than dwellings with a floor area greater than 50m2 that contain fixed services that condition the interior environment. Non-dwellings are responsible for almost 20 per cent of the UK’s energy consumption and carbon emissions.
Non-domestic Energy Performance Certificates (EPCs) are a rating scheme to summarise the energy efficiency of buildings. The building is given a rating between A (Very Efficient) – G (Very inefficient), and will also include tips about the most cost effective ways to improve the property’s energy rating. It should be noted that the numerical scale for non-domestic buildings is the opposite of that for domestic properties.
Energy Performance Certificates are used in many countries.
For non-domestic (all non-residential) properties this is a carbon based (CO2 emissions) metric, allowing owners, landlords, tenants and purchasers to compare different properties in terms of environmental impact.
The methodology assesses the actual building against a notional building of the same size and construction as the actual. The notional building is deemed to be energy efficient and the resulting rating compares the performance of the actual building to that. It makes no allowance for the hours of actual use nor the actual energy consumption incurred by the occupier.
There are three levels of building, Level 3, Level 4 and Level 5. The complexity of the property and the services used by that building will determine which level it falls under. The Non-domestic Energy Assessor must be qualified to the level of the building to carry out the inspection.
The comparison between properties of similar size and age however still remains valid.
The A to G scale is a linear scale based on two key points defined as follows:
The certificate includes recommendations on ways to improve the property to save money energy and carbon. The recommendations may appear general in tone, but they are bespoke to the actual property. EPC recommendations are cost effective in improving the energy efficiency of the property, but also include more expensive options (described as ‘longer term measures’) which are less cost effective in the short term.
The energy assessment needed to produce a non-domestic EPC must be carried out by a qualified non-domestic energy assessor, registered with an approved accreditation body. The UK Government has set up a publicly accessible central register of Assessors.
The calculation of the energy rating on the EPC is based on the Standard Building Energy Model (SBEM) Procedure created for the UK Government by the UK Building Research Establishment.
The Assessor will visit the property, examine key items such as all elements of building fabric (walls, floors, roofs, windows and doors) and all installed building services and controls (heating, cooling, ventilation, air-conditioning, lighting ). The exercise is entirely non-invasive (visual only).
Once back in the office, the Assessor inputs the observations into a software program which performs the calculation of energy efficiency. The energy assessor can either:
The accuracy of the recommendations will depend on the inspection standards applied by the assessor. All registered Ass
essors are audited by their accreditation bodies in order to maintain standards. An MEP Assessor has a high level of skills, maintained by regular CPD training which frequently exceeds the minimum requirement of their accreditation body and usually provides advice and guidance not generally offered by others.
The program gives a single number for the rating of energy efficiency, and a recommended value of the potential for improvement.
This database is FREE for you to use – and when you choose an MEP assessor you’ll know you’re dealing with a professional providing a fast, efficient and reliable service. That’s why MEP assessors are respected by some of the largest energy efficiency organisations in the UK.