We started 4+ to combine our boutique offices from various geographical locations to create a collaborative group with different specialties to manage our projects in ever-expanding parts of the world. This provides our clients with the best of both worlds–intimate and focused expertise and with the support of an overall large group.

Every project is assigned to one of the principals to ensure a high-touch experience regardless of project type


Our personalities are pretty wide-ranging but our principles are the same. Straight forward, open-minded, with a focused interest in shaping the perfect home for you.

Richard Dudzicki

Richard Dudzicki founded his London firm, RDA Architects almost thirty years ago, and since then Richard and his team have been at the very forefront of sustainable home design. As a member of 4Plus, he offers sustainability expertise and consultancy to international clients as well as in the UK. 


With more than 200 energy-efficient home design projects under his belt, ranging from renovations, retrofits, and enerphits to brand new Passivhaus builds, Richard and the team at RDA are true pioneers, showing the world that cleaner homes are not only possible and profitable, but beautiful — inside and out.

Richard Dudzicki

Director & founder, RDA Architects 

BA(Hons), DipArch(Dist)

ARB, RIBA 

Richard’s Projects

Magnolia House

Residential

The Pavilion
Residential

Modernist Enerphit

Residential

Village House

Residential

Chef's Garden

Residential

Pitched Passivhaus

Residential

Elegant international design

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