Alexander Buck is the in-house Sustainability Specialist and a Certified Passivhaus Designer at Buckley Gray Yeoman (BGY), where he has been a driving force for over eight years. With a passion for regenerative design and a strong commitment to a Retrofit First approach, Alex is dedicated to reducing the climate impact of the UK’s built environment. He embeds innovative, people-focused sustainability strategies into design-led architecture, ensuring environmental performance is considered at every stage.

With more than a decade of experience in the built environment, Alex has led multidisciplinary teams across all RIBA work stages, delivering a wide range of projects, from conservation-led refurbishments like Bedford Row to major commercial retrofits including 2 Gresham Street, 206 Marylebone Road, and Broadgate Tower. His work consistently balances technical performance with design excellence, pushing the boundaries of sustainable practice.

A committed advocate for the circular economy, Alex specialises in upgrading the thermal performance of existing building fabric to significantly reduce both operational and embodied carbon. His approach prioritises the reuse and enhancement of what already exists, aligning environmental responsibility with architectural integrity.

He has recently contributed thought leadership to the profession through published articles in both the Architects’ Journal and Architecture Today, sharing insights on sustainability, retrofit innovation, and the climate crisis. Beyond his role at BGY, Alex is an active voice in the green construction sector, regularly contributing to industry talks, conferences, and professional networks to support the transition to a net-zero future.