RDA Architects & Interior Designers

Creating beautifully responsible London homes

RDA is a leading-edge London Architecture & Interior Design firm specializing in award-winning, beautifully modern passive homes that are healthier for you, your family, and the environment.

Passivhaus Certified Since 2010 | 25+ Years Experience | Design First, Science Next Approach

RDA Architects & Interior Designers

Creating beautifully responsible London homes

RDA is a leading-edge London Architecture & Interior Design firm specializing in award-winning, beautifully modern passive homes that are healthier for you, your family, and the environment.

Passivhaus Certified Since 2010 | 25+ Years Experience | Design First, Science Next Approach

Over 25 years ago, Richard Dudzicki founded RDA to change people’s perceptions of what a home could be. Long before our Passivhaus certification in 2010, we were innovating in the eco-friendly space with sustainable home design for years. Over 200 projects later, we’re still fulfilling Richard’s mission, creating cutting-edge solutions for healthier homes.


Our goal is to design homes that are wholly reflective of your lifestyle, needs, and future while also addressing the evolving needs of our planet. As leaders in the UK’s Passivhaus movement, we embrace our duty to push the building envelope, create more with less, solve complex problems, and use our experience to guide you towards a better, cleaner, more comfortable lifestyle.

Ask the Expert

If you are interested in starting a project, but unsure of how to get started, we highly recommend our “Ask the Expert” consultation.


These sessions, lead by our Director, Lead Architect, and Passivhaus Certified Specialist, Richard Dudzicki, will provide you the information and isight you need to get moving. Click below to learn more about this and other resources.

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Why work with RDA?

We are highly regarded by our clients and our industry for delivering certified Passivhaus design, embracing modular and offsite construction, achieving planning on awkward or sensitive sites, and designing beautiful bespoke interiors, all while respecting your  budget.


We will oversee your projects from beginning to end so we can be sure we achieve your unique vision. Our meticulous attention to detail ensures that every building we complete is beautiful, functional, sustainable and generates meaningful value for you.

  • You'll benefit from working with one of the best regarded Passivhaus specialists in the UK.
  • With more than 25 years and 200 successfully delivered project, you can be assured you are in good hands.
  • We've seen it all, from large commercial developments to bespoke contemporary homes and unique renovation work.
  • Our strong relationships with councils and planning authorities, including unique local arrangements, such as The Dulwich Estate Scheme of Management, ensure quick approvals.
  • Our “Inside Out” design method ensures that your project is built to the highest standard of quality and innovative design.

Meet Our Team

Let our dream team help you design your dream home!

Ask the Expert

Thinking of embarking on a building project and not sure how or where to start? You've come to the right place. Our “Ask the Expert” consultation is the answer!


Click the link below to book a consultation with Richard Dudzicki, RDA's Director, Lead Architect, and Passivhaus Certified Specialist.


With more than 25 years of architectural experience and a deep portfolio of more than 200 projects in Greater London, and the UK, Richard knows his way around a job site, and can give you the clarity you need about your project.


For local clients, RDA has a long-standing, close working relationship with the Dulwich Estate Scheme of management and have successfully completed, new-build renovation and extensions within the area, as well as many other conservation areas across the UK.

Recently featured In...

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RDA transformed our Victorian house creating maximum space and light and provided innovative solutions to our design brief. We can’t recommend them enough!

-Katie,

 Dulwich

Commonly Asked Questions

  • What makes RDA different from other architects?

    At RDA, it's all about our clients, and if you don't feel like you are our only client, then we are not doing our job. We are highly experienced at helping clients get what they want, and that means you are our top priotiy, and we are here for you.

  • How do you work with celebrities and public figures?

    RDA has worked with a number of celebrities and public figures. Due to the private and intimate nature of our work, respecting the privacy and security of our clients is a top priority. For this reason, we offer a non-disclosure option to all clients.

  • What is Passivhaus?

    RDA is a leading PassivHaus design firm in the UK. A Passivhaus building is designed to be highly efficient, using effective insulation to remove drafts, and reducing the energy required to heat the home. It's not about relying on “eco-bling” to call it sustainable. Using PassivHaus certified materials and processes, we can deliver a more comfortable, higher quality building while reducing running costs by 90%, in any type of building.

  • How can I hire you?

    To get started with RDA, please schedule an “Ask the Expert” session or reach out to use by phone, email, or by

Recent Blogs

Enduring Design: Multiplying Modular Homes on Brownfield Sites

By Richard Dudzicki • November 19, 2025
What Makes Brownfield Sites Unique? Across the UK’s cities, thousands of small, disused plots sit idle: the remnants of former garages, workshops, and scrap yards. These brownfield sites, often dismissed as too constrained or contaminated for development, represent an untapped opportunity. Yet within these limits lies enormous potential. When approached with imagination and technical rigour, they can become prototypes for compact, sustainable urban living. Projects on brownfield sites are unique in their demand for a precise balance between innovation, practicality, and sustainability; ultimately, every square metre counts. And the result can be one of the most rewarding in contemporary housing design. Our project, Eva’s House , completed in 2005, offers a compelling example. Built on the footprint of two derelict garages in Southeast London, this modest three-storey home demonstrates how a forgotten plot can be transformed into a durable, adaptable dwelling that continues to perform nearly two decades later.

Reflections from the Venice Biennale: Architecture and Dystopian Futures

By Richard Dudzicki • October 10, 2025
Architectural Trip Venice Biennale RDA Architects

How To Upgrade a Grade II Listed Home Without Compromising Its Heritage

By Richard Dudzicki • September 23, 2025
Upgrading a listed home is one of the most rewarding yet challenging projects a homeowner can undertake. Unlike Standard properties, every change must respect strict planning regulations whilst protecting the historic character that makes the building unique. Choices that may seem simple in modern homes such as changing windows, adding insulation, or altering layouts can become complex negotiations between performance, aesthetics and compliance. The key to success lies in working with conservation architects, skilled craftspeople, and heritage professionals who understand both the technical and regulatory landscape. With their guidance, upgrades can be achieved in ways that not only preserve but often enhance the building's long-term performance and beauty. When done right, a listed home can be both energy-efficient and historically authentic, ready to thrive for future generations.
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