Summary of building regulations
L1 A building
shall be designed and constructed so as to ensure that the energy performance of the building is such as to limit the amount of energy required for the operation of the building and the amount of CO2 emissions associated with this energy use insofar as is reasonably practicable.
L2 For existing dwellings
The requirements of L1 shall be met by:
(a) limiting heat loss and, where appropriate, maximising heat gain through the fabric of the building;
(b) controlling, as appropriate, the output of the space heating and hot water systems;
(c) limiting the heat loss from pipes, ducts and vessels used for the transport or storage of heated water or air;
(d) providing that all oil and gas fired boilers installed in existing dwellings shall meet a minimum seasonal efficiency of 86% where practicable.
L3 For new dwellings
The requirements of L1 shall be met by:
(a) providing that the energy performance is such as to limit the calculated primary energy consumption and related CO2 emissions insofar as is reasonably practicable, when both energy consumption and CO2 emissions are calculated using the Dwelling Energy Assessment Procedure (DEAP), published by Sustainable Energy Ireland:
(b) providing that a reasonable proportion of the energy consumption to meet the energy performance of a dwelling is provided by renewable energy sources;
(c) limiting heat loss and, where appropriate, availing of heat gain through the fabric of the dwelling;
(d) providing and commissioning energy efficient space and water heating systems with efficient heat sources and effective controls;
(e) providing to the dwelling owner sufficient information about the dwelling, the fixed building services and their maintenance requirements so that the dwelling can be operated in such a manner as to use no more fuel and energy than is reasonable;
(f) providing that all oil and gas fired boilers shall meet a minimum seasonal efficiency of 86%
L4 For buildings other than dwellings
The requirements of L1 shall be met by:
(a) providing that the energy performance of the new building is such as to limit the calculated primary energy consumption and related CO2 emissions insofar as is reasonably practicable, when both energy consumption and CO2 emissions are calculated using the Non-domestic Energy Assessment Procedure (NEAP) published by Sustainable Energy Ireland;
(b) limiting the heat loss and, where appropriate, maximising the heat gains through the fabric of the building;
(c) providing energy efficient space and water heating services including adequate control of these services;
(d) ensuring that the building is appropriately designed to limit need for cooling and, where air-conditioning or mechanical ventilation is installed, that installed systems are energy efficient, appropriately sized and adequately controlled;
(e) limiting the heat loss from pipes, ducts and vessels used for the transport or storage of heated water or air;
(f) limiting the heat gains by chilled water and refrigerant vessels, and by pipes and ducts that serve air conditioning systems;
(g) providing energy efficient artificial lighting systems (other than emergency lighting, display lighting or specialist process lighting) and adequate control of these ‘systems
