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Experts in Hydraulic Design, Plumbing Consultancy, and Wet Fire Design

With 20 years' hands-on, trade-backed expertise, our designs ensure practical, compliant, and efficient solutions

One of our designs, based in Perth's CBD.

Cygnia Waters by Linic. Located in Waterford, WA.

Saunton Residences in Jindalee, WA.

Designed by Plumbers, Efficient, and Compliant

At OTG, we bring hands-on trade experience to every project, ensuring that what we design isn’t just efficient—it works in the real world. Our cost-effective, energy-efficient, and fully compliant solutions are tailored to your needs, built on decades of on-site expertise.

Cost-effective

Our designs promote long-term satisfaction and reliability, and reduce emergency expenses.

Compliant

Our breadth of experience and plumbing background ensures our designs promote safety, protect property values, and avoid fines and repairs.

Energy efficient

Our energy efficient designs conserve water and energy and contribute to environmental sustainability.

Our Services

Sewer and Sanitary Drainage

We specialise in sewer and sanitary drainage solutions, ensuring compliance, efficiency, and safety for residential, commercial, and industrial projects.

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Trade Waste Design and Management Solutions

We provide leading trade waste solutions for businesses across Perth and beyond. Our custom-designed systems adhere to local regulations and Australian Standards, minimising contaminants and protecting the environment.

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Water Services Design

Clean, compliant, and custom water solutions for every project—designed with best practices, backed by expertise, and built to last.

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Stormwater Management & Roof Drainage Solutions

We provide specialised, cost-effective, and engineered stormwater solutions that cater to diverse site conditions and ensure property protection, flood prevention, and compliance with local regulations.

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Wet Fire Services Design

We specialise in hydraulic fire services for various building classes and occupancies, offering comprehensive design solutions for fire hydrants, hose reels, sprinklers, and drencher systems.

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Independent Reporting and Expert Witness Services

We offer unbiased reporting and expert witness services for hydraulic and plumbing systems. We specialise in forensic analysis, compliance assessments, and litigation support.

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About Us

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Years of Experience

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Completed Projects

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Happy Clients

20

Days Average Turn Around Time

Real Solutions, Backed by Experience and Integrity

At OTG Group, we bring over 20 years' hands-on experience in hydraulic design and plumbing. Our journey began with Russell, a seasoned plumbing professional who started as an apprentice and worked his way up to becoming a licensed contractor and commercial hydraulic estimator.

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Why our customers love us

Tara Richardson

"I wish I could add more stars to this review, I can not descibe the wonderful service, professional advice and the amazing Russell. If you need help with anything they do , you can be guaranteed excellence, professsionalism, knowledge support and a friendly voice down the phone to boot. Thank you so much Russell and OTG , your incredible work has given me the opportunity to create my dream."

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Ian Bancroft

"I engaged OTG to provide a report on a client's property. Russell was very welcoming and engaging while discussing the issues. Russell attended site with me and provided professional advice, discussion and explanations to the issues of the property. The report was excellent, providing my client with options for the best way forward in resolving their water drainage issues. Highly recommend OTG."

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Kate Brockhurst

"We have worked with Russell for a number of years & have always found him to be extremely knowledgeable, efficient & very cost effective when helping with job costings, design & construct jobs or general plumbing questions. We would not hesitate to recommend Russell & the team at OTG."

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