Senior Mechanical Engineer – HVAC, Plumbing & Fire Systems
Dorna Pty Ltd
Homebush West, NSW
A$90,000-$110,000 p/a
On-site
Posted 1 day ago
About DORNA
DORNA is a reputable, family-owned Australian builder delivering high-quality commercial, industrial, and refurbishment projects across New South Wales.
Committed to integrity, innovation, and insight, we offer end-to-end construction and building services across Sydney’s commercial, industrial and multi-storey projects.
Due to strong project growth in NSW, we are seeking an experienced and highly capable Senior Mechanical / Building Services Engineer to join our Sydney team.
The Opportunity
This senior engineering role will lead the design, review, installation oversight, and sign-off for mechanical building services across our NSW projects, including:
HVAC (VRF/VRV, chilled water, mechanical ventilation)
Plumbing & hydraulic systems
Mechanical building services for commercial & industrial sites
You will be responsible for ensuring all mechanical services meet NSW building regulations, NCC/BCA, and all relevant NSW Fire Safety and hydraulic codes.
Key Responsibilities
Lead design and documentation of HVAC, plumbing, hydraulics, and fire systems for NSW commercial and industrial buildings.
Perform heat-load, air handling, pump and pipe sizing, static pressure, and flow calculations.
Prepare and sign engineering design packages (Form 15/16 equivalent NSW documentation where applicable).
Use Revit MEP, AutoCAD MEP, CAMEL/HAP, WaterCAD and other tools to deliver full mechanical design documentation.
Oversee mechanical services installation across Sydney sites.
Ensure compliance with NSW Building Code, NCC Vol. 1, local council requirements, and AS/NZS standards including:
AS/NZS 3500 (plumbing & drainage)
Conduct inspections, commissioning, performance validation and system sign-off.
Coordinate with NSW building certifiers, fire safety assessors, hydraulic consultants, councils and service trades.
Prepare O&M manuals, ITPs, commissioning plans, defect reports and compliance documentation.
Skills & Qualifications
Bachelor’s degree in mechanical engineering.
CPEng and/or eligibility to become an NSW Registered Professional Engineer (under the NSW Design & Building Practitioners Act – Mechanical).
Minimum 5 years’ experience in building services (HVAC, plumbing, fire).
Strong familiarity with NSW building approvals process and dealings with building certifiers.
Proficient with one of: Revit MEP, AutoCAD MEP, CAMEL / HAP, WaterCAD / EPANET
Strong understanding of NCC/BCA (NSW requirements), Fire Safety Schedules, and Annual Fire Safety Statements (AFSS) obligations.
Current NSW Manual Driver Licence.
White Card (Construction Induction).
Experience with Sydney commercial fitouts, industrial upgrades, or refurbishment projects.
Background in fire system certification, FPAS, or coordination with fire safety practitioners.
Why Work with DORNA
Competitive salary package aligned with NSW market conditions.
Autonomy and authority to lead and sign-off mechanical building services.
Work on landmark Sydney commercial and industrial projects.
Supportive, collaborative team culture built on quality and integrity.
Career development, including assistance for NSW professional engineering registration.
Opportunity to influence design excellence within a respected construction company.
How to Apply
Click Apply Now with:
✔ Your updated resume
✔ A one-page cover letter
Applications will be reviewed as they are received.
Note: Australian Citizens and Permanent Residents will be preferred. Other applicants with full work rights can apply only if they meet the above criteria.
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