What engineering reports are needed for a Construction Certificate in NSW?

It depends on building class and scope, but typical reports include: mechanical ventilation design per AS 1668.2, Section J energy efficiency report, hydraulic design documentation, fire safety schedule and fire engineering reports, and electrical design documentation. Your certifier issues a checklist specific to your project.

Do I need a Section J report for a construction certificate?

Yes, for all commercial buildings (Class 5-9) and multi-storey residential (Class 2-4). Section J covers energy efficiency requirements under the NCC. You need either a DTS (Deemed to Satisfy) assessment or a JV3 performance-based assessment. A building services engineer or energy assessor prepares this.

Who prepares engineering reports for a CC?

Registered building services engineers prepare mechanical, hydraulic, and fire protection documentation. Electrical engineers prepare electrical documentation. Energy assessors or engineers prepare Section J reports. All reports need to be prepared by appropriately qualified professionals.

What Engineering Reports Do You Need for a Construction Certificate in NSW?

Section 1

What Your Certifier Will Ask For

When you apply for a Construction Certificate in NSW, the certifier reviews your plans against the National Construction Code. For building services, they need engineering documentation proving your mechanical, hydraulic, electrical, and fire systems comply. What exactly they ask for depends on your building class, project scope, and development consent conditions. Here is the typical checklist.

Section 2

The Core Reports

Section J Energy Efficiency Report - Required for all Class 2–9 buildings. Either DTS compliance or JV3 performance solution. Covers building envelope, glazing, HVAC efficiency, lighting power density, and hot water. (NCC 2025, Section J)
Mechanical Ventilation Design - Required when any space relies on mechanical ventilation (not openable windows). Includes ductwork layouts, airflow calculations per AS 1668.2, plant selections, and system schematics. (AS 1668.2:2012)
Mechanical Design Certificate - A statement from the mechanical engineer confirming the design complies with NCC and referenced Australian Standards.
Hydraulic Design Documentation - Required for any changes to water supply, sanitary drainage, stormwater, or gas. Includes pipe sizing calculations, riser diagrams, and fixture schedules. (AS/NZS 3500 Series)
Fire Safety Schedule - Required for most commercial buildings. Lists all fire safety measures (sprinklers, detection, exits, hydrants) and confirms compliance with NCC.
Fire Engineering Report - Required for performance-based fire solutions or when DTS provisions cannot be met.
Electrical Design Documentation - Switchboard schedules, cable sizing, lighting layouts, emergency lighting and exit sign design.

Section 3

Reports by Building Type

1

Commercial Office Fitout (Class 5)

Section J report, mechanical ventilation design, fire safety schedule. Hydraulic only if plumbing is modified. Electrical design for new distribution boards.

2

Retail / Restaurant / Gym (Class 6)

All of the above plus kitchen exhaust design (AS 1668.1) for restaurants. Higher ventilation rates for gyms. Car park ventilation if applicable.

3

Multi-Storey Residential (Class 2)

Full mechanical, hydraulic, electrical, and fire documentation. BASIX certificate (separate from Section J). Smoke hazard management for buildings over 25 m.

4

Industrial / Warehouse (Class 7–8)

Mechanical ventilation for occupied areas. Stormwater design. Fire sprinkler design if required by NCC. Electrical design for industrial loads.

Section 4

Common Mistakes That Delay CCs

Submitting without a Section J report - Most common cause of rejection for commercial and multi-residential projects.
Mechanical drawings missing airflow rates - Drawings must reference AS 1668.2 and show calculated airflow rates for each space.
No fire safety schedule when one is required - The certifier cannot issue a CC without it for most commercial buildings.
Hydraulic design not matching the DA-approved plans - Any discrepancy between engineering and architectural drawings triggers a request for information.
Using outdated NCC edition - Must be NCC 2025 for current applications.
Not engaging engineers early enough - Results in incomplete documentation and last-minute rush that delays the CC.

Section 5

Who Needs to Know What

Section 6

References

National Construction Code 2022, Section J — Energy Efficiency
AS 1668.2:2012, The use of ventilation and airconditioning in buildings — Part 2: Mechanical ventilation in buildings
AS/NZS 3500 Series, Plumbing and drainage
Environmental Planning and Assessment Act 1979 (NSW)
Environmental Planning and Assessment Regulation 2021 (NSW) - Construction Certificate requirements

What Engineering Reports Do You Need for a Construction Certificate in NSW?

What Your Certifier Will Ask For

The Core Reports

Reports by Building Type

Commercial Office Fitout (Class 5)

Retail / Restaurant / Gym (Class 6)

Multi-Storey Residential (Class 2)

Industrial / Warehouse (Class 7–8)

Common Mistakes That Delay CCs

Who Needs to Know What

Need this engineered for your project?

References

Related design memos

Temporary Power and Services During Construction

Electrical Distribution Board Sizing and Layout

Essential Services and Life Safety Power