Design Science is a Gold Coast building design practice led by David Steadman — one of the few professionals in Australia who holds both a QBCC Builder’s Licence and a QBCC Building Designer’s Licence. Less than 1% of professionals nationally carry both.
That dual qualification isn’t just a credential. It means every design we produce is informed by real construction knowledge — how structures go together, what materials cost, where builders run into problems, and how to prevent cost blowouts before they happen.
We provide custom home designs, renovations and redesigns, and sustainable design services across the Gold Coast, Brisbane, and South East Queensland.
I was born into a building industry family, and Design Science is the result of over 30 years spent working across every side of the construction and design industry.
I started on the tools — as a tradesman, then an estimator, then a project manager, then a licensed builder. Along the way I also qualified as an accountant, completed an MBA, and held senior appointments both in Australia and abroad. I’ve sat on every side of the table: builder, designer, client, even the person doing the books.
That breadth of experience is rare. Most building designers have never held a hammer. Most builders have never drawn a plan. I’ve done both, and that shapes every decision Design Science makes.
My QBCC Builder’s Licence number is 15277902 — the same number as my Building Designer’s Licence. I’m also a member of Master Builders Queensland (088541), the Housing Industry Association (1303687), and a Justice of the Peace.
We don’t hand builders a set of pretty pictures and hope for the best. Every project is 3D digitally modelled — framed and built in the digital world first.
That produces a full bill of quantities, resolves structural details upfront, and gives builders the information they need to quote accurately. Read our latest insights on achieving better building outcomes.
I’ve seen countless projects stall or blow out because the designer didn’t understand what things actually cost to build. At Design Science, budget is considered from the very first sketch.
Whether you’re planning a renovation or a new home, we design to your budget — not around it. Understanding what the budget will enable is always the starting point.
A clear, detailed set of documentation is what separates a project that gets three competitive quotes from one that builders won’t touch. When contractors can see exactly what’s required — materials, methods, connections, finishes — they can price with confidence.
Our plans go beyond the minimum. They include the level of detail that construction professionals need to quote accurately and build confidently. That means fewer variations, fewer disputes, and a smoother build. Get in touch to discuss how our documentation process removes ambiguity from your project.
Design Science isn’t just David. We employ in-house Building Designers and a Registered Architect, giving us the capacity to handle projects of all scales — from bathroom renovations and outdoor areas through to full home renovations and multi-million dollar residences.
Every project benefits from the same philosophy: construction-informed design, thorough documentation, and transparent communication from start to finish. We set clear timeframes at the start and keep you informed throughout.
“It’s not about how things are, but how they should be.”
Australia’s residential building industry is, frankly, not keeping pace. Too many homes are designed without regard for their environment, built to a budget that prioritises façade over substance, and documented so poorly that builders are left guessing.
Design Science exists because I believe we can do better. Our approach combines sustainable design principles with practical construction knowledge to produce homes that are genuinely suited to the way Australians live — and the climate we live in.
Design fees start from $3,000. We charge a consultation fee upfront, which is credited in full if you proceed to a design engagement. No hidden costs, no ambiguity about what’s included. Building designer fees typically sit between 4% and 7% of the construction cost — and we’ll give you a clear quote before any work begins.
Every project includes full 3D digital modelling, construction-ready documentation, and a predictable design process from initial consultation through to construction documents. Read what our clients say about working with Design Science.
Already formulated your vision? Or seeking a start point and guiding hand?
We can help you commence your journey today.
