Sustainable Building Designers The team at Blencowe Design have over 19 years’ experience in the home building design industry. We believe in always researching new and different ways to design and build for higher performing homes. We pride ourselves on producing energy efficient home designs and home additions that have a lower impact on our environment, require less energy to operate and are more economical to run. We believe in creating a healthy indoor environment with maximum indoor air quality and fewer toxins, which will not only keep you healthy but also add value to your home. Whether you are looking for a sustainable architecture building design, a Passivhaus, a sustainable design review or planning a home addition, we are here to help.