The Building Regulations Part L establishes the energy efficiency integrity for a residential building. The government has produced these regulations to promote more efficient living, by reducing carbon emissions, reducing heat losses, and gaining solar all over the UK. They would try to inspire us to connect resourceful thermostats and modern controls so that we can live an efficient life.  

Part L of the building regulation are requirements used for new, conversions to exciting construction projects. It offers a typical standard for energy performance and carbon emission for exciting and new builds. These regulations have been separated into four approved documents for a more detailed function, they are:  

• •  L1A Conversation of fuel and power in new dwellings

• •  L1B Conversation of fuel and power in existing dwellings

• •  L2A Conversation of fuel and power in new buildings other than dwellings

• •  L2B Conversation of fuel and power in existing buildings other than dwellings

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L1A Conversation of fuel and power in new dwellings  

The document highlights different principles for indicating building regulations compliance, for when it is at design stage and after build is completed. Part L1A would cover energy usages that are key factors within a build, such as lighting, heating, water heating and temperature control. The main factors associated with these documents, which are looked at mainly, are building fabric, fixed building services such as heating, lighting, air conditioning, hot water, ventilation and mechanical ventilations, and the systems that control them.  

L2A Conversation of fuel and power in new buildings other than dwellings. Part L2A purpose is to conserve fuel and power in all builds, apart from dwellings where L1A and L1B would apply instead. Naturally, commercial builds would use loads of energy, through auxiliary power and lighting, than for a domestic property. For this reason, reducing carbon emissions is essential during the non-domestic build stage.  

Building Regulations Part L2A and L2B apply to all new and existing commercial buildings in England and Wales. Part L2A's main objective is to lower CO2 emissions based on the building’s envelope. This document's plan is to target CO2 emission rate (TER) for businesses. 

How c02 emissions are calculated with certain key factors, which would include:  

• •  Fabric energy efficiency

• •  Building size

• •  The usage of energy, for example heating, cooling, lighting and ventilation 

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To be compliant with Part L2A, the CO2 emission should have a target, as this is based on the 2010 regulations. The result should have a collective of 9% reduction in England, and for Wales should be 20% reduction.  

Part L2A also implements to advance long-term sustainability for buildings.  Compliance will consistently lead to building cost savings and less materials used on site, lowering long-term energy costs. Part L2A compliance includes: 

• •  Air tightness to be lower

• •  Thermal bridging to be reduced

• •  Renewable technology for roofing

• •  Double glazing to improve insulation

• •  Reducing the fans power, making it below 0.5 W/l/s

• •  Reducing lighting with less watt and that they are efficient saving, reduced levels are acceptable with the use of a control system

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