Forest Lodge eco-house featured on Grand Designs Australia officially opened by Sydney Lord Mayor Chris and Belinda Knierim on the rooftop garden of their eco-house in the Sydney's inner west Source: News Limited Building a sustainable house on a block just 3.9m wide was a challenge, but one that Chris Knierim pulled off so well it was featured on Grand Designs Australia. The Forest Lodge house appeared on the last season of the Australian series. It was officially opened by Sydney Lord Mayor Clover Moore last week. Having worked on sustainable projects in Germany and around the world, Mr Knierim, a builder and designer, felt that Australia was lagging behind building environmentally friendly houses and took on the challenge to build his own place. The property is on a block just 3,9m wide. Latex ceilings create an illusion of height and space. The house itself is a two storey, three bedroom terrace. It's a sustainable home in that we've tried to reuse materials as much as possible and if we brought we tried to limit our carbon footprint," he said. We tried to source materials that were second hand, so bricks on site where builders have stuffed up on other jobs, so we would pick them up in the ute, clean them up and reuse them. Mr Knierim said the biggest challenge of building the house was getting trucks down the street because it is narrow. The narrow block presented a host of challenges including delivery of materials. It is just 3.9m wide. The roof-top garden and solar-powered slab heating system. See how they built it in the video below. "So every time we had to get a delivery I had to make sure I reiterated what the maximum size of the truck could be," he said Every time was difficult and a couple of times its been a couple of (millimetres) gap going down the street.. Mr Knierim now lives in the house with his family and said it was awesome. Sleek and modern interiors feature throughout the home. Belinda Knierim checks her make-up in one of the bedrooms. An 8-m vertical garden is a key design feature. House Features ■ A 8m vertical garden wall adjacent to the front door ■ Double glazed windows ■ Latex ceiling on ground floor, which is stretched and gives illusion of mirror ■ Underground water tanks ■ Wireless switches with iPad or iPhone connectivity, except in the bathrooms ■ Insulating the ground underneath the slab to store heat and provide hot water