Two site professionals reviewing drawings inside a part-built extension

Our Story

Engineering knowledge and a dedicated construction team — one dependable way to turn plans into well-built spaces.

01 · Our Story

Built to give you one trusted team

RDK Design & Build was created to give homeowners and developers a simple, dependable way to turn plans into well-built spaces. As part of RDK Group, we combine the engineering knowledge of our sister company, RDK Civil Engineering, with a dedicated construction team that takes your project from concept to completion.

Kitchen extension with a vaulted ceiling and sage green units
02 · Our Reason for Being

We exist to make building simple and stress-free

Too often, design and construction are handled by separate companies, which can lead to delays, confusion and unexpected costs. RDK Design & Build brings them together, so you have one trusted team, clear communication and quality you can see in the finished result.

Our Vision

To be a trusted name in design and construction across the UK, known for engineering-led quality, honest communication and projects delivered from concept to completion.

Our Mission

To deliver high-quality residential and commercial building projects, managed by engineers, with clear communication, reliable delivery and attention to detail, so every client feels confident from the first consultation to the final handover.

03 · Our Values

The principles behind every project we deliver

Quality WorkmanshipAttention to detail in every project.
Clear CommunicationRegular updates and a dedicated point of contact.
Reliable DeliveryWe work to an agreed programme and keep you informed.
Client FocusedTailored solutions to suit your requirements.
Portrait of Ranga Kalupahana, Director
Ranga KalupahanaBSc Eng (Hons), MICE · Director
04 · A Word from the Director
Engineering is about solving problems carefully and building things that last.

Welcome to RDK Design & Build. That belief sits at the heart of everything we do. Whether it is a family home extension or a larger development, every project deserves the same discipline, planning and attention to detail.

By bringing design and construction together within RDK Group, we remove the gaps that so often cause delays and frustration. Our clients benefit from engineering knowledge at every stage, one joined-up team and a build that is delivered the way it was promised.

Thank you for considering RDK Design & Build. We would be delighted to talk about your project.

Ranga KalupahanaBSc Eng (Hons), MICE · Director, RDK Design & Build Limited[Draft message — to be approved by Ranga]
Portrait of Sasith Mahawaduge, Operations Manager
Sasith MahawadugeB.Sc Eng (Hons), M.Sc. (Con.PM), AMIE(SL) · Operations Manager
05 · A Word from the Operations Manager
Every project should run the way we promised it would.

My role is to make sure every project runs to programme, to specification and with clear communication from start to finish.

I work closely with our project managers, site teams and clients to plan each stage carefully, coordinate materials and trades, and carry out quality checks along the way. A well-organised site and regular updates mean fewer surprises and a smoother experience for you.

Our aim is simple: a high-quality result, delivered on time, that you are proud to call your own.

Sasith MahawadugeB.Sc Eng (Hons), M.Sc. (Con.PM), AMIE(SL) · Operations Manager[Draft message — to be approved by Sasith]
06 · Meet Our Team

The people who deliver your project

Our experienced team focuses on quality workmanship, clear communication and reliable delivery, helping homeowners and developers create beautiful, functional spaces.

07 · Part of RDK Group

Design, planning and construction — one complete service

RDK Design & Build works alongside our sister companies. RDK Civil Engineering provides architectural design, planning applications, structural design and Building Regulations support, and RDK Developments brings the sites and development opportunities. Together we offer a complete service, from planning and structural design through to construction on site.

08 · Our Commitment

Quality, safety and careful project management

We take pride in delivering high-quality construction projects with clear communication and careful project management.

Quality WorkmanshipAttention to detail.
Safe Working PracticesA clean and organised site.
Regular Site UpdatesKeeping you informed.
Programme ManagementWorking to agreed timeframes.
Trusted SubcontractorsExperienced and reliable.
Customer SatisfactionA smooth and stress-free process.
10 · Let’s Talk

Let’s talk about your project

Whether you are planning a home extension, loft conversion, garage conversion, renovation or new build project, get in touch with our team today.