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66 low energy student apartments with ground floor commercial space


Development of 66 student residential apartments and 225m2 of commercial space required to achieve 15% reduction in CO2 emissions according to Plymouth City Council policy CS20.


– 15% reduction in CO2  requirement using Low Zero Carbon Technologies following Plymouth City Council Policy CS20)

– Requirement to ensure future connection to district heat main when available

– HVAC and service requirements for mixed use commercial and student accommodation.

– Client requirement for grid supplied conventional domestic gas central heating and hot water

– Limited space for conventional Low Zero Technologies

– Consultation to understand direction of travel in achieving CO2 emissions targets.


–  High level consideraton of design and materials to establish fabric energy efficiencies

– Delivery of feasibility study for Low Zero Carbon Technologies

– IES/SBEM 2012  modeling to esatabilsh compliance

– IES/Radiance used for potential overheating risk

– SAP 2012 calculations for residential elements in  study



– Preliminary energy modelling and compliance testing  under IES ModelIT/SBEM 2012 /Apache/Radiance and SAP 2013

– Delivery of highly energy efficient residential and commercial spaces maximising Fabric Energy Efficiency in external elements detailing to establish very low energy demand baseline

– Low levels of heat loss through major junctions (using Accredited Construction Details)

– Consideration of glazing strategy to each elevation – Initial specification  ensured low heat loss with reductions in solar gain and noise potential.

– Heating and Hot water strategy using  natural gas and flue gas heat recovery.

– High efficiency, low loss, heating and hot water distribution systems.

– Maximal use of Power Factor Correction equipment

– Cost efficient, low output  initial Internal Lighting design strategy to further reduce energy consumption

– Minimised use of Roof mounted Photovoltaic to 175m2


Project Details


May 2016 – Ongoing


Hand Drawn Home  Architects


North Hill, Plymouth, Devon


Pillar Land Securities Ltd

Plymouth City Council


High levels of Fabric Energy efficiency with the use of Accredited Construction Details and reasonable Air Permeability rates with natural ventilation

 Summary of Building Fabric Standards above Part L 1A and Part L2A 2013 Building Regulations limiting requirements

Element Part L1A New


  Part L2A New Extension



Intermediate Walls



0.15 -0.26

0.15 -0.22

Roof 0.12 0.12-0.15
Ground floor 0.12 0.12
Glazing 1.0-1.4 1.0 -1.4
Air Permeability (m3/m2hr @ 50pa)

Thermal Bridges (Y values)

Thermal Mass Parameter







9,874 kg CO2 of regulated energy and approximately 1,773 kg CO2 from unregulated energy use across the development.


 CO2 emissions reduction requirement for the proposed development of 41 North Hill, Plymouth

Use Heated Floor Space (GIFA) m2 Building Emissions Rate  (DER) kgCO2/m2 Total Emissions kgCO2/year
Residential 1995 21.9 43,690
Commercial 1124 19.7 22,142
Regulated Energy 65,832
Unregulated 3084 25.56 11,824
TOTAL 77,656


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