- Project plans
- Project activities
- Legislation and standards
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Last edited 20 Nov 2017
BREEAM Reduction of energy use and carbon emissions
 Aim and benefits
This issue rates how well buildings have minimised energy demand, primary energy consumption and CO2 emissions. It only covers regulated energy (pre-2018), and so excludes external lighting, small power, and specialist equipment.
The aim of this credit is to encourage designers to take a holistic view to an efficient energy strategy in a building, rather than solely reducing energy (ENE 4 Passive Design) or replacing fossil fuels with renewables (ENE 4 LZC Feasibility).
Part L is concerned solely with reducing CO2 emissions from a building. While there are limiting factors (e.g. minimum fabric efficiencies), it is entirely plausible to have a building that uses a large quantity of energy but off sets it all with renewables to comply with building regs.
ENE 01 balances reducing operational energy demand, primary energy consumption and CO2 emissions to give an "Energy Performance Ratio". The three graphs below show the the energy performance ratio given for each of these three elements for the percentage improvement over a notional building as read from the BRUKL compliance report. These figures apply to ENGLAND ONLY. This varies per country to account for the fact that some country's building regulations are more stringent than others.
The EPR for each element, is then added up to give an overall EPR which is compared to the ENE 01 credits table in the BREEAM manual. The ENE 01 calculator/scoring and reporting tool does this all for you, but sometimes it's handy to know the background. A spreadsheet has been included in the tools and resources section which contains the above graphs, if you find it helpful to get your head around the calculation.
So, as an example, if you have a building that uses a lot of energy for building services and doesn't have especially efficient fabric (e.g. only just meets building regulations for Primary Energy Consumption and Energy Demand), then the maximum credits you can get, regardless of how much energy offset by renewables is 5 UK New Construction 2014 credits. Note, in previous schemes additional requirements may mean 5 credits are not achieved.
 When to consider
These stages are "Strategic Definition" and "Preparation of Brief". It's unlikely you'll get any solid information during these stages regarding credit targets. However, if your client has said that energy efficiency is a main priority for the project, you can probably assume you'll achieve more credits than if they're happy to scrape through building regs.
This stage is "Concept Design". Standard RIBA Stage 2 deliverables at this stage include conduction an initial Part L appraisal. While this might not finalise the number of credits you'll actually achieve (there's a lot of design changes to go yet!), it should give you a reasonable idea.
"Developed Design". An interim Part L report is often a deliverable from this stage. This will give you a better idea of the number of design stage credits you'll achieve. This may be the final Part L design stage report you get, depending on whether there are further design changes during RIBA Stage 4.
"Technical Design". At this stage, a full "as designed" Part L report should have been produced, and submitted to building control for approval. The report which is submitted to building control is pretty "safe" to use as your design stage evidence, providing it meets all criteria etc.
"Construction". Try to keep an eye on design changes as best as possible. If there's anything big relating to building fabric, heating/cooling systems or renewables ask for confirmation that there is no effect on Part L from the engineers.
 Step by step guidance
 Questions to ask while seeking compliance
 Tips and best practice
Tip: Don't assume that a lovely fully naturally ventilated building will score better than a glass mechanically ventilated sky scraper. This credit still relies on a percentage improvement against a notional building. So as long as your mechanically ventilated glass box is better than the notional mech vent glass box, you can still score well in this credit (albeit you may score lower elsewhere).
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