Knights Place! Rowan House!
Exeter City Council – Client, Structural and Civil Engineers Gale & Snowden - Architects, Mechanical Engineers and Landscape Architects, Passivhaus Designer Andrew Peel – Passivhaus Certifier Jenkins Hansford Partnership – QS
Affordable Passive Houses for Exeter
Exeter Office Exeter Bank Chambers 67 High Street Exeter Devon EX4 3DT Tel. 01392 279220 Fax. 01392 279036
Bideford Office 18 Market Place Bideford Devon EX39 2DR (Registered Office) Tel. 01237 474952 Fax. 01237 425669
www.ecodesign.co.uk
Our Team • Exeter City Council Client, Structural and Civil Engineers • Gale & Snowden Architects, Mechanical Engineers, Landscape Architects, Passivhaus Designer, Building Biologists
Passive natural vent
Passivhaus certified
Permaculture design
Landscape integration
• Jenkins Hansford Partnership - QS
Exeter Infill Sites • 12 sites in Exeter • 120 affordable units • individual designs • Passivhaus • Minimum CSH 4 • Lifetime Homes compliant Aims • Provide affordable housing for Exeter • Raise standards of housing in Exeter • Tackle Fuel Poverty
Knights Place / Rowan House Project Summary
• • • • •
18 units at Knights Place/ 3 units at Rowan Hs 15 month construction programme £2.5m development cost £1.15m in HCA grant funding £1,550/m² Construction Costs (excl. externals)
• Project drivers: – – – – – –
fuel poverty energy sustainability future climate change low maintenance downsizing healthy buildings
Site / Landscaping Permaculture principles
Landscape Architect and Species expert as part of Gale & Snowden in-house design team. Emphasis on integrated design using Permaculture principles Working with natural system not against
Healthy Indoor Environment Building Biology Principles!
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• Non-toxic eg: non VOC materials • High quality ventilation • High levels of natural daylight • Thermal comfort • Avoidance of dust mites by good design and materials selection • User control • Radial wiring to reduce low frequency Electro-Magnetic Fields (EMFs) • PVC free throughout
Passivhaus – Design Strategy! High levels of insulation" Uvalue < 0.12 W/m²K" " Continuous Air tight Barrier" < 0.6 ac/h @ 50 Pa" " Thermal Bridge Free" (following the PH method)" " High Performance Windows and Doors" Uvalue (instl) < 0.85 W/ m²K >92% efficient MVHR (following the PH method)" Op4mized Solar Orienta4on Compact Building Form
" Knights Place Exeter - Section"
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What makes a Passivhaus?! Energy Losses"
Transmission " Losses"
Energy Gains"
Internal Gains"
Knights Place / G&S"
Solar Gains" Ventilation " Losses"
Heating"
Passivhaus Refurb / G&S (pending)"
Knights Place Exeter - Section" Rowan House / G&S"
Passivhaus – Why bother? Minimal Energy Losses
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" Thermal Imaging of Knights Place proves:" " Implementing the Passivhaus methodology has reduced heat losses and thermal bridging to a minimum."
Pre-occupation • Community liaising at pre planning stage • Passivhaus building design and operation workshops held with prospective tenants
• Pre-occupancy training for selected tenants • Community garden design workshops with neighbours
Post-occupancy • Training • User manual • Exeter City tenant Support
Key achievements • Passivhaus compliant • Designed to meet Code 4 of the CSH • Fully compliant with Lifetime Homes Standards • All occupants gain private gardens, designed using Permaculture principles
• Solar Panels serving each individual unit will further reduce the energy demand for domestic hot water
• Designed to meet best practice daylight levels in accordance with the requirements of the Code for sustainable homes.
• 100% energy efficient light fittings throughout • Compliant with Secured by Design • Independently assessed under the Building for Life standard with a final score of 18.5 out of 20
• Considerate Constructors Scheme rating of 37.5 out of 40 • Use of low water use fittings reduces the water consumption to less than 80 litres/person/day
What we’ve learnt • The need for greater contractor collaboration and learning"
• Greater consideration of work sequencing" • Simplify the design and make it more robust" • Greater lead in time would be beneficial" • Repairs and maintenance team early involvement proved valuable"
• A committed client remaining in control of the design process by choosing a traditional procurement route has proven essential for the success of the project"
What’s next? Council Own Optimum Form Build 2
A ‘Five Finger’ approach to sustainable and affordable housing for Exeter: Healthy by Design Affordable, Low Energy Housing
Optimum Orientation
Integrated Landscape Climate Ready Flexible and Adaptable
What tenants said Feedback ! ‘I love the fact that the flat is warm all the time and whenever I come in from outside it is always nice and warm unlike any other building I have been in’ “J’aime le fait que l’appartement soit comfortable , quand je rentre il fait toujours bon, ce qui n’était pas la cas des autres habitations dans lesquelles je vivais auparavant.” ‘It gets hot sometimes but is controllable via a window or boosting the vent.’ “Des fois il fait chaud, mais c’est controlable grâce aux fenêtres et à la ventilation” ‘Not a day goes past where I don’t say I like living here.’ “Il ne se passe pas un jour où je ne me dis pas que j’aime vivre ici” ‘ I have never felt uncomfortably hot or cold a single day since moving in’ “Je n’ai jamais eu trop chaud ou trop froid depuis que j’ai emmenagé”
Thank You.!