Previous Projects

Retrofit of 1970s Chalet Bungalow


Deep retrofit of 1970s chalet bungalow with goal of meeting the Passivhaus EnerPHit standard for heating demand, of 25 kWh/(m2.annum)

Services Provided

PHPP energy demand modelling.

Specification of external insulation, triple-glazed windows, solar PV, Mechanical Ventilation & Heat Recovery system and air source heat pump.

Installing ducts and sound baffles for mechanical ventilation system.

Project managed all works.


Overheating eliminated.

Energy demand reduced 87%.

Air quality improved – average CO2 levels approx. 500 – 600 ppm.

late 19th century terraced house


Whole house retrofit plan for late 19th century terraced house in a conservation area.

Services Provided

Retrofit report including condition assessment

Whole House Retrofit Plan


Client has a plan that fully describes how to make the home warmer and more energy efficient

Reduce bills by 64% and eliminate all carbon emissions.

1920s Semi-Detached Bungalow


Reduce summer overheating in a 1920s semi-detached bungalow, and make it significantly warmer in winter whilst not damaging its mid-period charm.

Achieve ‘LETI’ energy efficiency targets.

Services Provided

Full PHPP thermal analysis.

Whole House Retrofit Plan.

Options development for phased implementation allowing the retrofit to be progressed in stages over time.

Additional advice on materials and options as owner progressed towards planning.


Client is adopting an approach that will remove and insulate the roof, with triple glazed and shaded windows upstairs.

Allows for phased implementation of better windows downstairs and external wall insulation later.

Opportunity to reduce bills by 50%, and to reduce carbon emissions by 75%.