Passivhaus Calculations
Turn your dreams into reality. If you’re building a new home, it could stay warm all year round with minimal energy input. Detailed calculations are needed to ensure the design uses about 1/10th the energy of a typical house while keeping you warm in winter and cool in the summer. Tim has completed about 20 PHPPs for new buildings, 2 to Passivhaus certification level.

Retrofit Consultancy
If you’re thinking of improving your home, expertise can help you make the right decisions for a result you’ll love. Tim is a Retrofit Co-ordinator with RetrofitWorks, working on the Greater London Authority’s ‘Warmer Homes’ scheme. He’s produced the energy calculations for 10 detailed projects in PHPP, 1 certified to EnerPHit level and calculated around 80 thermal bridges.

AECB PHribbon
PHPP users will find this add-on saves you a lot of time. Tim is the author of this software and also a tutor for the AECB Carbonlite retrofit course. It gives a whole set of tools to streamline PHPP v9.6 and adds daylighting, costing and embodied energy.

What retrofit can do for you – comfort, warmth, low bills…

● warmer home with more even temperature
● eliminate mould (a cause of childhood asthma)
● stylish and smart appearance of the building
● improve the air quality and have warmer fresh air with heat recovery ventilation (MVHR)
● cost effective – repairs may be needed anyway, improving warmth doesn’t cost much extra
● cost effective – retrofits pay for themselves over their lifetime
● protect yourself from future energy price rises
● reduce CO2 emissions to protect our future
● reduce noise, triple glazing reduces road, train or aircraft noise


Many home owners, when interviewed about their retrofit in 2017 for Transition Stroud, would have done it slightly differently. Some found it colder than they were expecting – going for Building Regs minimum standard won’t give you a warm home. We give indicative costs associated with your choices so you can get the best result for your budget and circumstances.

See also the AECB Low Energy Building database and select Build Type “Refurbishment”
Superhomes examples

Chartered Architectural Technologist
Passivhaus Designer
Retrofit Coordinator