Passivhaus Affiliate

Wandsworth terraced house retrofitted to EnerPHit standard

A 120 year old terraced house has been successfully retrofitted to the EnerPHit standard. The Victorian shop-conversion had not been lived in or maintained for over 30 years and was in need of a deep retrofit to bring it into the 21st century.

Clients Luigi and Jane Caccavale bought the house on Barmouth Road in Wandsworth in 2013 with construction starting in March.

The house was designed by Alexander Owen Architecture in collaboration with energy consultants Green Tomato Energy, who have worked on a number of Passivhaus projects including Princedale Road and Lena Gardens.

Barmouth Road (c) Green Tomato Energy

The house was insulated internally to retain the original appearance of the façade and to meet stringent planning requirements. A new ground floor extension was constructed at the rear of the property to add extra living space.

Triple glazed sash look-alike casement windows were specified to retain the original aesthetics while providing the high levels of thermal efficiency and airtightness required to achieve the EnerPHit standard.

Main Team:

Client: Luigi and Jane Caccavale

Architect: Alexander Owen Architecture

Energy Consultants: Green Tomato Energy

Contractor: Reality HG

Structural Engineer: Elite Designers

Certifier: WARM Low Energy Building Practice


Key PH Performance Details:

Airtightness: 0.87 ach @ 50Pa

Thermal energy demand: 23 kWh/m2.year

Thermal energy load: 14 W/m2

Primary energy demand: 114 kWh/m2.year

Form factor: 2.58

TFA: 139 m2

27th May 2014

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