Showcasing refurbishment: Sheffield Eco-terrace Mat Colmer Head of Housing & Supply Chain

Presentation Title.org.uk/housing 2 Home energy use is responsible for over a quarter of UK carbon dioxide (CO 2 ) emissions which contribute to climate change Ultimately, by 2050 all dwellings will need to achieve an energy performance rating in the range of a high EPC band B to band A if we are to reach our target of a 80% cut in CO 2 emissions across the entire housing stock The headline challenge

Presentation Title.org.uk/housing 3 Background to the refurbishment competition Twice the terrace The ultimate large family home and a viable solution to overcrowding Shillam + Smith Architecture & Urbanism

Presentation Title.org.uk/housing 4 Background to the refurbishment competition 21 st C terrace Open plan living and working for a young urban couple Letts Wheeler Architecture & Design Ltd.

Presentation Title.org.uk/housing 5 83 Robey Street, Sheffield Ash Sakula Architects

Presentation Title.org.uk/housing 6 Existing property and its energy performance ~10% of all existing dwellings are solid walled mid terraced properties

Presentation Title.org.uk/housing 7 Thermal elementU-value (W/m 2 K) Roof void above room in roof space2.30 Roof void above first floor rooms/loft eaves1.07 Solid brickwork external walls2.10 Stud walls to room in the roof space1.37 Ground floor0.62 OpeningsU-value (W/m 2 K) Solid timber doors3.00 Existing double glazing2.70 Velux rooflight3.40 Other features Thermal bridging analysis (y-value)0.028 W/m 2 K VentilationNatural (no extract fans) Airtightness21.7 m 3 /m HeatingCombi boiler 70% efficient Hot waterFrom boiler Low energy lightingNone OrientationFront elevation - south west 39 SAP2005 E EPC band 7.2 t/yr Total CO 2 emissions

Presentation Title.org.uk/housing 8 Pre-refurbishment figures Energy sourceTotal energy demand (kWh/yr)Annual running costs Gas Main heating and hot water25,500 £935 Cooking1,250 Electric Secondary heating1,550 £540 Lights, pumps & fans920 Appliances2,250 CO 2 emissions (kg/yr) 0 2,500 5,000 7,500 Central heating 4,801 Domestic hot water 797 Lights, pumps & fans 390 Cooking & appliances 1,190 Total 7,178 CO 2 emissions as existing

Presentation Title.org.uk/housing 9 Airtightness testing and infrared thermography

Presentation Title.org.uk/housing 10 Thermal bridging details 37 non repeating thermal bridge junctions extensive modelling of 112 existing and improved junction variants Existing dwellings do not have significant thermal bridging y = W/m 2 K pre-refurbishment Detailing at Eco-terrace has maintained a good level of thermal bridging y = W/m 2 K post -refurbishment provided an existing dwelling with the equivalent of the Enhanced Construction Details (y = W/m 2 K) Investigation has significant learning for industry, and may bring in more locations for inclusion in SAP revisions

Presentation Title.org.uk/housing 11 Completion – October Month project duration 7 Month build time

Presentation Title.org.uk/housing SAP2005 A EPC band <1.7 t/yr Total CO 2 emissions Thermal elementU-value (W/m 2 K) Roof0.20 Solid brickwork external walls (internal insulation)0.28 Solid brickwork external walls (external insulation)0.39 Walls to room in the roof space0.14 Ground floor0.18 OpeningsU-value (W/m 2 K) Solid insulated timber doors1.79 BFRC A rated double glazing1.36 Velux rooflight (as existing)3.40 Other features Thermal bridging analysis (y-value)0.043 W/m 2 K VentilationMVHR (SAP Appendix Q accredited) Airtightness6.7 m 3 /m HeatingRegular boiler 91.2% efficient Low energy lighting100% Solar thermal panels4m 2 flat plate Photovoltaic panelsGenerating capacity 0.86 kWp

Presentation Title.org.uk/housing 13 Post-refurbishment figures Energy sourceTotal energy demand (kWh/yr)Annual running costs Gas Main heating and hot water3,870 £265 Cooking1,250 Electric Lights, pumps & fans770 £218 Appliances1,800 Offset from PV-670 CO 2 emissions (kg/yr) ,000 2,000 Central heating 450 Domestic hot water 301 Lights, pumps & fans 324 Cooking & appliances 1,001 Total 1,697 CO 2 emissions as refurbished Offset from PV -378

Presentation Title.org.uk/housing 14 Now it is an eco-terrace 76% reduction in CO 2 emissions This represents a The overall cost of the Eco-terrace is in the region of £150,000 Material costs for energy efficiency measures £45,000

Presentation Title.org.uk/housing 15 Tool-box talk Training links each job and contractor to overall energy performance of property all trades can impact a refurbishment, from the first one in to the last every job can impact on the performance achieved by the previous trades high levels of energy efficiency requires the highest standards of workmanship Contractor noted that the approach to working did change favourably in the other dwellings which formed part of the overall refurbishment scheme in Page Hall

Presentation Title.org.uk/housing 16 Lessons learnt Energy Saving Trust: Flexibility in terms of timeline One size does not fit all Performance assessment must include both regulated and non- regulated emissions Engagement and training for all on-site trades –where any CO 2 savings are missed the burden is passed to other dwellings Clear lines of communication with project teams Involvement of the local community and local representatives

Presentation Title.org.uk/housing 17 Next steps….

Presentation Title.org.uk/housing 18