Do You Need Council Approval for a Mezzanine Floor in NSW?

It’s one of the first questions any business owner asks when considering a mezzanine floor for their warehouse, factory or commercial space: do I need council approval? The answer is usually yes, but the type of approval and the process depends on a few key factors.

Here’s a clear guide to mezzanine floor planning compliance in NSW.

Why Mezzanine Floors Typically Require Approval

A mezzanine floor is classified as an increase in the gross floor area (GFA) of a building under the NSW planning system. Any addition that increases a building’s GFA even within an existing structure typically requires some form of planning or building approval. This applies whether the mezzanine is in a warehouse, factory, retail shop or commercial office.

Additionally, mezzanine floors must comply with the National Construction Code (NCC/BCA) and, where people work on them, WorkSafe NSW requirements for workplace safety structures including staircases, handrails and load ratings.

DA vs CDC Which Approval Do You Need?

There are two main approval pathways in NSW:

1. Complying Development Certificate (CDC) A CDC is a fast-track approval issued by a private certifier no council involvement required. It’s available for mezzanine floors that meet pre-set standards under the State Environmental Planning Policy (Exempt and Complying Development Codes) SEPP.

For most standard industrial and commercial mezzanine floors that fall within the SEPP thresholds, a CDC is the quickest and simplest approval path. A private certifier can typically assess and approve a CDC application within 10–20 business days.

When a CDC may be available:

• The mezzanine is within an existing approved industrial or commercial building
• It doesn’t exceed relevant GFA thresholds under the SEPP
• The building is in a zone that allows the use
• There are no heritage overlays or special provisions applying to the site

2. Development Application (DA) A DA is lodged with your local council and goes through a formal assessment process. It takes longer (typically 6–16 weeks or more) and involves more documentation but it’s required when a CDC is not available.

When a DA is likely required:

• The mezzanine GFA addition exceeds CDC thresholds
• The property has a heritage listing or is in a heritage conservation area
• The local Environmental Planning Instrument (LEP) requires DA for the proposed works
• The development involves a change of use

What Documentation Is Required?

Whether you’re going through a CDC or DA pathway, you’ll need:

• Architectural or structural drawings showing the mezzanine design, dimensions and location within the building
• Certified structural engineering drawings a registered structural engineer must produce and certify engineering documentation showing the design loads, column sizes, beam sizes, connection details and compliance with AS/NZS standards
• Statement of environmental effects (for DA applications)
• BASIX certificate (if residential use is involved)
• Fire safety considerations depending on the class of building and the GFA increase, a fire engineer’s report may be required

Sydney Structural Steel provides certified structural engineering documentation as part of our mezzanine floor service. This documentation is required by your certifier and council we make sure it’s complete, accurate and ready for submission.

WorkSafe NSW Requirements for Mezzanine Floors

Beyond council approval, mezzanine floors used in workplaces must comply with WorkSafe NSW requirements under the Work Health and Safety Act 2011. This includes:

• Mezzanine platforms must be engineered to support the maximum intended load
• Access stairs must comply with AS 1657 (fixed platforms, walkways, stairways and ladders)
• Perimeter handrails must be installed to a compliant height (typically 1,000mm for industrial and 1,100mm for commercial)
• Anti-slip stair treads are required in workplace environments
• Pallet gates must be installed at any forklift or pallet access points

We design and fabricate every mezzanine floor to meet these requirements as a standard not an optional extra.

Exempt Development When No Approval Is Needed

Some very minor structures may qualify as exempt development under the NSW SEPP, meaning no approval is required. However, mezzanine floors that increase GFA and are used as a workplace almost never qualify as exempt. Do not assume your mezzanine is exempt without confirming this with your local council or a registered certifier the consequences of building without required approval include stop-work orders, fines and mandatory removal.

What Should You Do First?

1. Check your zoning — confirm your property’s zoning and any overlays via the NSW Planning Portal (planningportal.nsw.gov.au).
2. Speak to a private certifier — a certifier can confirm whether a CDC is available for your project and guide you through the documentation requirements.
3. Engage your fabricator — once you know your approval pathway, a qualified fabricator like Sydney Structural Steel can provide certified engineering drawings and design documentation to support your application.

We Can Help

Sydney Structural Steel provides certified structural engineering documentation for all mezzanine floor projects. Our team is familiar with the approval requirements for mezzanine floors in Sydney and can advise on what’s needed for your specific project.

Call [+61] 296154777 or visit sydneystructuralsteel.com.au/contact for a free consultation.