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From 1st October 2008 energy performance certificates will be needed when all commercial buildings are built, sold or rented.

Public buildings throughout England and Wales will need to display an energy certificate from October 2008 (similar legislation will also apply to Scotland and Northern Ireland).

These certificates must be produced by an accredited energy assessor.

There are two types of energy certificate:

The Energy Performance Certificate, which is required for all buildings when they are constructed, sold or let.

The Display Energy Certificate, which is required for public buildings and those occupied by public authorities which provide a public service to a large number of people - these will show the actual energy usage of a building and need to be displayed at all times from 1st October 2008.

We specialise in new buildings in England & Wales only.

The calculation required to produce an energy rating for a building is a complex and time consuming exercise.

The key factors involved are:

 

1. The type of construction of the building (including walls, roofs, floors and glazing and their thermal performance)

 
2. The main use of the building as a whole and whether parts, or zones as they are referred to, of the building are used for different purposes  e.g. office, plant room, tea making, toilets, production area etc, and the occupancy profile for each zone

 
3. Heating, cooling, ventilation and hot water systems used and their seasonal efficiency

 
4. Type of lighting and the associated controls provided

 
5. The use of sustainable/low or zero carbon technology (e.g. photo-voltaic units, wind turbines, solar water heating, heat pumps,  etc)

 

 

The energy performance of non-dwelling is shown as a CO2 based index. This depends on the energy used for space heating, water heating, ventilation and lighting, less any energy generated from energy generation technology installed in the building (such as solar water heating).

The Simplified Building Energy Model (SBEM) or Dynamic Simulation Software (DSM) assesses the energy demands of each individual space in the building in accordance with the activity conducted within that space (e.g. office, kitchens, storage space, corridors and circulation areas etc).

Different activities can result in different periods of occupancy and different temperature ranges, as well as varying requirements for lighting and hot water supply. The energy consumption and carbon dioxide emissions are calculated by considering these demands in relation to the details of the building services.

The recommendation report included with an EPC will help to improve the energy rating of a building. The recommendations only include those improvements that are appropriate for the building that has been assessed. For each recommendation indicative paybacks are noted. The recommendations are provided in four categories those:

·         with a short term payback – less than three years

·         with a medium term payback – between three and seven years

·         with a long term payback – greater than seven years

 

If you would like to discuss any aspect of your project -

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Last modified: October 10, 2008