Social housing is becoming the proving ground for sustainable construction, with Octopus Energy’s Tenant Power tariff addressing the split incentive that has long blocked retrofit investment. Clearer returns for landlords should accelerate energy-efficient buildings, sustainable building design, sustainable design and eco-design for buildings, placing whole life carbon, net zero whole life carbon, embodied carbon, embodied carbon in materials, whole life carbon assessment, lifecycle assessment, life cycle thinking in construction and life cycle cost at the centre of decision-making. Procurement frameworks are set to move the market beyond pilot projects by aggregating demand, shortening delivery times and giving supply chains the certainty needed to scale net zero carbon buildings and low carbon building programmes. That shift supports environmental sustainability in construction through low carbon design, low carbon construction materials, low embodied carbon materials, renewable building materials, sustainable material specification, environmental product declarations (EPDs), resource efficiency in construction and circular economy in construction, including end-of-life reuse in construction. For teams working to BREEAM and BREEAM v7, the priority is measurable building lifecycle performance, carbon footprint reduction and a lower carbon footprint of construction across greener, more investable retrofit programmes.