See how people in Bristol and Somerset are using the Green Deal to improve their homes

The aim of this website is to encourage people in Bristol and Somerset to undertake low-carbon home improvements through the Green Deal.

It gives householders who have done this – for example by insulating their home, installing micro-renewables or draught-proofing their windows and doors –  the chance to share this with others, and to rate the installers who carried out the work.

You can browse the map below to find case studies near you, filtering the results by the type of home and by the type of improvement.

We are the Centre for Sustainable Energy, a registered charity based in Bristol. Why not check out our Home Energy Advice website to get impartial support and advice before undertaking your new home energy improvement project.

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Accredited installerCalista Group

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Approved Services Offered

Micro renewables
Air source heat pumps | Biomass boilers | Ground source heat pumps | Photovoltaics | Solar water heating

Cavity wall insulation | External wall insulation systems | Internal wall insulation (of external walls) systems | Loft or rafter insulation (including loft hatch insulation)

Space heating, cooling and ventilation
Flue gas heat recovery devices | Gas-fired condensing boilers

Water heating
Heating controls (for wet central heating system and warm air system) | Hot water controls (including timers and temperature control)


The Calista Group brings together a range of renewable energy products and services into one innovative and forward-thinking business.
At the core of the group, is providing an exceptional customer experience and offer insulation, microgeneration and heating solutions to homes and businesses in the South West and South Wales.

We take a whole building approach, which is an integrated way of making sure your entire home or business as energy efficient as possible. We’re driven to help you save money on your energy bills.

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Unit H
Hitchcock Business Park
EX15 3BZ

Certification ID: ELCI59633

Tel: 0845 6089940