Princedale Road Passivhaus, Holland Park, London   Teplo Tie
PrinceDaleRoad2   TeploTie


The first certified Passivhaus retrofit in the UK

Octavia Housing’s Victorian Passivhaus  is the first certified Passivhaus retrofit in the UK, cutting CO2 emmissions by 83% and saving the tenants £910 per year in fuel bills.

Octavia Housing alongside engineers and builders Ryder Strategies, architects Paul Davis + Partners, energy consultants Eight Associates and consultants and project managers greentomatoenergy transformed the 1850s terraced house in a Holland Park conservation area by refurbishing it to strict Passivhaus levels. PassivHaus is a exacting German low energy building standard that requires the home, amongst other criteria, to use less than 15kWh of energy to heat it per m2 per year, compared to the UK average of 130kWh. This means the home can be kept warm on a winter evening with just the heat generated from cooking and the homes occupants. The home’s CO2 emissions and energy consumption have been cut by an estimated 83% and 94% respectively, saving the tenants an estimated £910 a year on fuel bills. The ultimate goal is to offer maximum comfort to the inhabitants and a home that is future proofed against fuel poverty.

The house was initially gutted internally and a steel frame was constructed internally separate from the existing external masonry walls, to allow the creation of a thermal bridge free insulation zone between the masonry and the steel frame.  MagmaTech supplied a bespoke TeploTie with a stainless steel threaded end which was chemically anchored in the existing external masonry wall and then fixed to the steel frame with a bolt on the threaded end, thus tying the new and old structure together without creating a thermal bridge.

The project was funded by the Technology Strategy Board’s Retrofit for the Future programme, that aimed to conduct an eco experiment to prove retrofitting can be done on the broad range of the UK’s existing housing stock. In this case the aim was to transform a Victorian house into an exemplar low energy home.

Dr Wolfgang Feist, the founder of Passivhaus, presented the project team with the certificate on 1 March 2011. Accreditation was given by Peter Warm of WARM: Low energy building practic. Peter said:

‘The renovation at 100 Princedale Road is a milestone in the history of thermal renovation - it has achieved the demanding “Passivhaus” standard, the leading standard for low energy building. What makes this a milestone is that this is a building in a conservation area, where external wall insulation is not generally acceptable, and that it has dealt with the difficult issues of internal wall insulation and building airtightness by an overall concept of lining the shell with a continuous box. The airtightness of the building is ten to twenty times better than most current building projects. This surely will be one of the buildings that shape how we learn to deal with our existing housing stock.’

The house comes equipped with over a dozen low energy innovations, including the UK’s first imitation sash triple glazed windows (required to meet the planning constraints of the conservation area), super wall insulation, ESE solar thermal panels and a heat exchanger system (MVHR) that recycles energy from waste air and water. The home has no gas boiler, radiators or conventional heating system and uses these innovations to keep the house at a comfortable temperature with a healthy air-flow all year round.

July 2012

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