Last modified on Mon 8 Mar 2021 04.00 EST Instead of parking spaces, itâs flowerbeds and vegetable planters that line the car-free street of Solar Avenue in Leeds, where rows of 60 low-energy homes form a little oasis along a bend in the River Aire, a short walk from the city centre. Built in a factory across the road, these terrace houses are made from super-airtight timber panels stuffed full of wood-fibre insulation, with triple-glazed windows and solar panels on the roof, each erected in less than a week. Using up to 10 times less energy than a conventional house, their heating demand is so low that they create excess electricity that is fed into a community grid and used to charge shared electric cars. There will soon be 1,000 such homes here, along with a combined primary school and care home, as well as a timber office building with yoga decks and a tennis court on the roof, together forming the pioneering Climate Innovation District.