Award-winning commercial interior design on the Gold Coast
25 years of industry experience. QBCC-licensed building design expertise. Nationally recognised, award-winning commercial interiors.
When searching for the top interior designers on the Gold Coast, businesses should look beyond beautiful imagery. Commercial interior design requires proven experience, technical qualifications and a practical understanding of compliance, construction, operational requirements and commercial budgets.
Leithal Designs is an award-winning commercial interior design and building design studio led by Sonia Leith. With 25 years of industry experience and a Queensland Building and Construction Commission licence, Sonia brings together creative design, technical documentation and extensive construction knowledge to deliver spaces that are visually distinctive, highly functional and ready to be built.
Our work spans corporate offices, workplaces, medical and dental clinics, hospitality venues, retail shops, government facilities and complex commercial fitouts throughout the Gold Coast, Brisbane and South East Queensland.
Award-winning commercial interior design
Leithal Designs was recognised at the 2025 Interior Fitout Association Design Awards, winning Best Design – Health Services over $500,000 for the Proud Smile Dental Clinic at Hope Island.
This prestigious industry award recognises the design quality, technical resolution and detailed coordination behind a sophisticated healthcare environment—one that balances patient comfort and wellbeing with clinical operations, specialist equipment, accessibility and compliance.
View the 2025 IFA Design Award winners →
Sonia's design experience and industry perspective have also been featured by global architectural surface brand Cosentino as part of its C·Top Designers series.
25 years of experience behind every project
For 25 years, Sonia Leith has worked across interior design, building design, technical documentation and construction delivery. This depth of experience allows Leithal Designs to identify opportunities and potential problems early, coordinate complex project requirements and develop interiors that work in practice—not simply in presentation images.
Every project benefits from direct principal-level involvement, from the initial briefing and concept design through to consultant coordination, construction documentation and assistance during delivery.
QBCC-licensed design expertise
Leithal Designs offers the added assurance of a QBCC-licensed Building Designer.
This qualification is particularly valuable for commercial fitouts, where successful design must respond to the National Construction Code, accessibility, egress, fire safety, amenities, services coordination and other statutory and construction requirements.
Our documentation is prepared with builders, certifiers, engineers and specialist consultants in mind, providing the detailed information required to price, approve and construct the project with greater clarity.
More than an interior designer
Leithal Designs is a design partner who understands the complete commercial project—not only how the finished space should look.
We consider how your business operates, how staff and customers move through the environment, how the design will be documented and constructed, and how decisions will affect your program and budget.
This combination of award-winning creativity, QBCC-licensed technical expertise and 25 years of practical industry experience is what distinguishes Leithal Designs among the top commercial interior designers on the Gold Coast.