Benefits and regulations

Building's energy conservation and windows.

The latest Approved Document L, which came into effect in April 2006, covers all aspects of a building’s energy conservation, including its windows. Once again, a FENSA registered installer will ensure that all the latest updates in compliance requirements are met.
The new Document L is divided into four parts:
ADL1A – Conservation of fuel and power in new dwellings
ADL1B – Conservation of fuel and power in existing dwellings
ADL2A – Conservation of fuel and power in new buildings other than dwellings
ADL2B – Conservation of fuel and power in existing building other than dwellings.

Document L for New Build Dwellings (ADL1A)

This document has dramatically changed previous energy compliance requirements. The new energy compliance standard is now the Target Carbon Dioxide Emission Rate – or TER. TER is the minimum energy performance requirement for a new build dwelling. The only way of complying with the TER is to calculate, using approved calculation software, the CO2 emissions for the proposed building as a whole, and to show that the levels for the designed building and final construction meet the required emission target.

Document L ADL1B – Replacement Doors and Windows for Dwellings

The ADL1B requires that one of the three requirements below are met –
1 – a ‘whole window/unit’ should have a U-Value of 2.0 W/m2K. Doors should have a U-Value of 2.2 W/m2K for doors (frame and glass)
2 – a glass ‘centre pane’ should have a U-value of 1.2W/m2K
3 - a Window Energy Rating (WER) of at least band E

Document L – conservatories

Most conservatories do not need to comply with Document L - but Document L does apply to conservatories with a floor area greater than 30m2. These need to attain any one of the following three energy standards:
1 – a ‘whole window/unit’ should have a U-value of 2.0W/m2K. Doors should have a U-Value of 2.2 W/m2K for doors (frame and centre pane)
2 – a glass ‘centre pane’ should have a U-value of 1.2W/m2K
3 - a Window Energy Rating (WER) of at least band E

Document L – Historic Properties

With regards to listed properties and buildings in conservation areas, Document L makes special allowances. The general guidance is that every attempt should be made to improve the energy efficiency provided the work does not prejudice the character of the building or add to its deterioration.






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