Background SMC Investcorp Ltd enlisted the support of Base Energy to carry out detailed Energy Statements and SAP calculations at its Inglis Road development in Ealing, London. The plans were for the design and construction of 21 flats, over three storeys, in line with the London 5.2 Plan. The story Due to the development being more than 10 dwellings, it had to achieve near zero carbon and there was also a requirement for an overheating analysis to accompany this. To comply, the site needed a minimum 35% saving in CO2 emissions over Part L1a 2013. After the 35% reduction in CO2 was achieved, the remaining carbon would be assessed and a cash in lieu contribution for the remaining carbon emissions (up to 100%) would be charged back to the developer. The Solution Due to the zero-carbon requirement, the dwellings had to be designed to a very high standard in terms of energy efficiency and we were able to advise on this. The site also had to be future proofed where the design had to take into account the potential to connect to a possible district heating network. With our knowledge and expertise, Base was able to show that the London Plan target reduction in CO2 emissions could be met via a fabric first approach with MVHR, advanced heating controls and Solar PV. This resulted in an average 39% reduction in CO2 emissions over the Part L1a 2013 baseline, equating to a total saving of 10,947 Kg/year CO2 saving for the whole development. The remaining carbon then had to be assessed for the development. The carbon left over would then be charged out, where Ealing council apply a factor of £60 per tonne of CO2 over 30 years.