A quick guide about services I provide.

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I use proven Passive House methodology and thermal bridging modelling.

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I am Eric Fewster, a Certified Passive House Consultant, Chartered Water and Environmental Manager and Chartered Environmentalist.

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ColdProof aims to function with the underlying principles of accuracy, attention to detail, honesty, transparency and perseverance.

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What improvements you will see if you undertake an energy efficient action plan.

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See case studies and examples of ColdProof's previous work.

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Whole house retrofit specialist – energy analysis, cost estimation & project planning for low energy refurbishment.

Tired of living in an uncomfortable house? If you are planning to carry out any significant renovation or retrofit of your house, it will provide you with an ideal opportunity to address any chronic issues common to older houses, such as heat loss in colder months and overheating in summer, discomfort from draughts, condensation and mould, health problems related to poor indoor air quality, and huge energy bills.

ColdProof is a retrofit specialist that is able to guide people who want to integrate high-performance energy efficiency measures into whole house refurbishment & renovation. The approach used is holistic and robust, including everything from accurate energy analysis, modelling and costing up materials needed, to advising on building contractors and even providing project management when needed. Passive House methodology and thermal bridge modelling are used for the analysis – tools which are well known for their accuracy – which enables homeowners to reach specific space heating demand or carbon emissions reduction targets such as the AECB Silver Standard or EnerPHit.

Check out the Quick Guide that summarizes what ColdProof can deliver.


ColdProof delivers accurate energy analysis to ensure cost-effective planning for low energy refurbishment of old buildings. Once a baseline is known, this is then used to create a practical energy-efficiency action plan in order to reach agreed energy or carbon reduction targets. ColdProof also provides retrofit project co-ordination.

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Techniques used

The energy analysis is done using the Passive House Planning Package (PHPP) – a proven, accurate and flexible tool that can model an existing building with different retrofit scenarios. THERM is also used for thermal bridge modelling, meaning that heat loss and low surface temperatures to be designed out at problem junctions.

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An ethical business

ColdProof is built on principles of accuracy, honesty, transparency & perseverance, and aims to foster an interactive planning process with clients to arrive at the most cost-effective solution for reducing carbon emissions. ColdProof is also committed to giving 10% of turnover towards funding training in low-energy construction techniques for site managers and builders in the UK.

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Past projects & testimonials


From surveying my property to assess its particular heat-loss characteristics to seeing the refurbishment to its completion, Eric has paid attention to all the details. This had included not only the calculation of what strategies were appropriate to reduce heat loss, listing the materials required, their quantities and suppliers, but also co-ordination of the work and installing the MHVR. This joined-up thinking throughout meant a minimisation of the inevitable mess and upheaval such a radical overhaul of a house entails.

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Contact ColdProof

Please don’t hesitate to get in touch!

Hersey Street, Salford, Greater Manchester M6 5GT

Tel. +44 (0)7814 788 846

Email: ericfewster@coldproof.co.uk