Tassos supports several key public and private stakeholders with achieving high energy efficiency standards on construction projects, developing and meeting net zero objectives, producing robust sustainability strategies and frameworks as well as identifying key opportunities and challenges associated with their strategic decisions for both new and existing assets.

His work includes amongst other developing central government policy impact analysis and evidence bases (Part L, Future Homes Standard, Modern Methods of Construction and other), informing local authorities sustainability requirements and plans (S106, SPD, minimum requirements, renewable energy generation and capacity statements) as well as working on performance metrics and technical details.