As well as being a chartered architect, Tim Offer is also a certified Passivhaus designer.
Passivhaus, or passive house, is a simple concept designed to minimise energy use while providing a really comfortable indoor environment. It does this by using objective modelling and energy related targets. It is a flexible approach that does not prescribe how to meet the baseline targets, allowing creativity and a variety of solutions. It is dependent on careful detailing and rigourous attention to getting things right on site.