Our Services
At Hewitt Engineers, we provide high-precision Mechanical Building Services & HVAC Design engineered to meet the unique demands of diverse sectors across Sydney and Australia. From the stringent environmental controls of Pharmaceutical and Healthcare facilities to the sophisticated comfort requirements of Aged Care, Education, and Premium Residential developments, our solutions are built for performance.
We deliver integrated HVAC (Heating, Ventilation, and Air Conditioning) systems tailored to each project’s lifecycle. By collaborating closely with architects, developers, and contractors, we ensure our designs not only exceed regulatory standards but also enhance building efficiency and occupant wellbeing.
Design Ventilation Systems
Effective ventilation is the foundation of indoor air quality, which is why at Hewitt Engineers, we design systems that masterfully balance fresh air intake with energy recovery. In addition to ensuring strict Australian compliance, our ventilation expertise includes mechanical design for complex-built environments and advanced car park ventilation with carbon monoxide (CO) monitoring. Moreover, we specialize in high-demand facilities such as commercial kitchens. As a result, every system we deliver ensures full compliance with NCC and Australian Standards (AS1668), providing a safe and breathable environment for all occupants.
Our ventilation expertise includes:
- Mechanical ventilation design for complex-built environments
- Advanced car park ventilation and carbon monoxide (CO) monitoring
- Specialist exhaust and supply air systems
- Commercial kitchen and amenities ventilation for high-demand facilities
- Full compliance with NCC and Australian Standards (AS1668)
Air Conditioning Systems
High-performance air conditioning defines the modern built environment, and accordingly, we design resilient and scalable climate control solutions. These systems provide precision temperature stability while simultaneously reducing operational overheads through high-efficiency equipment selection. Our services encompass everything from central plant system design (Chillers & Boilers) to high-efficiency VRF and VRV systems. In particular, we focus on detailed ductwork and piping layouts to ensure that every technical equipment selection is perfectly sized for the building’s specific capacity needs.
Our air conditioning services include:
- Central plant system design (Chillers & Boilers)
- High-efficiency VRF and VRV system design
- Chilled and hot water reticulation
- Technical equipment selection and capacity sizing
- Detailed ductwork and piping layouts
Fire & Smoke Control Systems
Fire safety is a non-negotiable pillar of integrated building design. For this reason, we engineer life-safety systems that safeguard occupants and support structural integrity through rigorous mechanical smoke management. Specifically, our team provides smoke exhaust systems, stairwell pressurisation, and integrated zone smoke control strategies. By implementing these performance-based fire engineering solutions, we ensure that high-occupancy buildings remain compliant with safety codes while offering maximum protection during emergencies.
Mechanical Building Services & HVAC Design
We provide:
- Smoke exhaust and management systems
- Stairwell and lift shaft pressurisation
- Integrated zone smoke control strategies
- Performance-based fire engineering support
- Compliance-driven designs for high-occupancy buildings
Hydronic Systems
Hydronic systems offer superior energy transfer and thermal stability, making them an ideal choice for large-scale facilities and high-end developments. Because water has a much higher heat-carrying capacity than air, these systems can transport thermal energy far more efficiently across long distances. Consequently, traditional air-based systems often reach their physical limits in complex architectural footprints, whereas hydronic solutions provide a more compact, quiet, and energy-efficient alternative. At Hewitt Engineers, we design these systems to ensure consistent climate control while simultaneously minimizing space requirements and long-term energy waste.
Our hydronic services include:
- Precision chilled water (CHW) and heating hot water (HHW) systems
- Boiler and chiller plant optimisation
- Hydraulic pipe sizing and network layout
- Plant room design and space-efficient configurations
Building Air Pressure Control
Maintaining precise air pressure is essential for both hygiene and safety within a modern facility. Consequently, our solutions manage airflow between critical zones to prevent contamination and ensure environmental integrity. At Hewitt Engineers, we recognize that pressure control is not just about comfort; rather, it is a vital component of a building’s life-safety and functional strategy
- Stair and lift shaft pressurisation for fire safety
- Positive/Negative pressure control for Clean Rooms and Laboratories
- Specialized healthcare and hospital applications
- Air leakage management and building envelope integrity
Energy Efficiency & Sustainability
Energy performance is at the very heart of our design philosophy. Because we believe in sustainable engineering, we help clients reduce their carbon footprint and operational costs through data-driven analysis. For instance, we utilize advanced energy modelling and thermal analysis to provide NABERS and Green Star engineering support. Additionally, our approach includes system optimisation and lifecycle cost assessments (LCCA), thereby ensuring that sustainability is integrated into the financial and operational success of the project.
- Advanced energy modelling and thermal analysis
- NABERS and Green Star engineering support
- System optimisation and retro-commissioning
- Lifecycle cost assessments (LCCA)
Specialized Environmental Control
For highly sensitive environments, maintaining a standard climate is often insufficient. Therefore, we provide granular control over the internal atmosphere to protect both specialized processes and the people performing them. By implementing advanced sensor technology and customized logic, Hewitt Engineers ensures that even the most volatile environmental variables remain stable.
- Humidity Control: Dehumidification and humidification solutions for data centres, healthcare, and pharmaceutical storage.
- Thermal Comfort: Detailed load calculations and zoning strategies to ensure comfort in every corner of the building, regardless of external Sydney weather extremes.
- Heat Recovery: Capturing waste energy through energy recovery wheels and heat exchangers to drive down total building energy demand.
Integrated Mechanical Design Approach
At Hewitt Engineers, we do not view mechanical systems in isolation; instead, we treat them as a single, cohesive organism that must function in perfect harmony with the rest of the building. Because modern construction requires extreme precision, we utilize advanced BIM (Revit) and AutoCAD workflows to deliver highly coordinated designs. By doing so, we ensure that our mechanical systems integrate seamlessly with electrical, hydraulic, and structural disciplines from the very first stage of the project.
This holistic approach reduces installation conflicts, lowers capital costs, and ensures long-term operational reliability for your next high-stakes project. Because we integrate mechanical systems with structural and electrical frameworks from the earliest design phase, we eliminate the “siloed” thinking that often leads to project delays. Consequently, our clients benefit from a streamlined construction process where every component has a predefined and coordinated place.
Get in Touch
If you are looking for expert mechanical engineering services for your commercial project, Hewitt Engineers is here to help. Our team is ready to deliver tailored solutions that meet your specific requirements.
Contact us today to discuss your project and discover how we can support your next development.
Frequently Asked Questions:
We provide comprehensive mechanical building services across a wide range of sectors. Our expertise extends beyond standard commercial offices to highly regulated environments, including Pharmaceutical laboratories, Healthcare facilities (hospitals and clinics), Aged Care, Education campuses, and High-end Residential developments. We tailor each HVAC system to the specific air quality and thermal requirements of the industry.
Absolutely. We specialize in mechanical services for fitout projects, ensuring that new air conditioning and ventilation layouts integrate perfectly with modified floor plans. Whether it’s a high-end office boutique, a retail space, or a specialized medical suite fitout, we re-engineer existing HVAC systems to maintain optimal airflow, thermal comfort, and compliance with the latest Australian building code.
Yes, 100%. Every design produced by Hewitt Engineers is strictly engineered to meet the National Construction Code (NCC) and relevant Australian Standards (such as AS 1668 for ventilation and AS 2112 for medical gas where applicable). We ensure that all systems are fully compliant, facilitating a smooth certification process for developers and builders.
Energy efficiency is a core pillar of our design process. We utilize advanced energy modelling and thermal load calculations to right-size equipment and reduce waste. Our strategies often include Heat Recovery Systems, variable speed drives, and smart zoning, helping projects achieve high NABERS or Green Star ratings while significantly lowering long-term operational costs for the built environment.