Expert Building Services Consultants The BSE 3D team comprises the expertise of building services consultants who recognise that our success is based on our strong relationships with our clients. We work with organisations across London, Sussex and Surrey as well as nationally and even internationally; priding ourselves on being considerate and proactive consultants who strive to offer the best solutions. We design for best performance, lower life cycle cost, comfort, and practical solutions for simplicity in operation and maintenance.