September 14, 2026

Do I Need a Structural Engineer for a Factory? | PBE

In short

Yes. A structural engineer's design and certification is required to obtain a building permit for a new factory in Victoria, and is also needed for most alterations to an existing factory, including racking installations, mezzanines, plant upgrades and a change of use.

Factory owners and operators often assume a structural engineer is only needed for a brand new building, but the requirement applies far more broadly. Anything that changes the loads on a factory structure, adds new equipment, alters the internal layout or changes how the building is used, typically calls for a structural assessment. This page sets out when engineering input is required and what happens if it is skipped.

When a structural engineer is required for a factory

In Victoria, a building permit cannot be issued for a new factory, or for most structural alterations to an existing one, without structural drawings and certification from a qualified engineer. The building surveyor who issues the permit relies on the engineer's documentation to confirm the structure meets the relevant Australian Standards.

Key Point: The trigger is not the size of the building, it is whether the work affects load paths, structural elements or the loads the structure carries. A small factory extension can require the same level of structural input as a large one if it involves new footings, framing or floor loading.

New factory builds

A new factory needs a full structural design covering the frame (steel portal frame, precast concrete or another system), footings, floor slab and any hardstands. This design work happens alongside the architectural and services design so that column layouts, spans and bracing suit the intended operation of the facility.

Factory fit outs and racking installations

Fitting out an existing factory, or installing pallet racking, often triggers a structural review even where no new building work is involved. Racking imposes point loads on the floor slab that the original design may not have accounted for, and tall racking systems can also need engineering input for their own structural stability. A structural engineer inspection of the existing slab is the usual starting point before racking is installed.

Scenario	Typical structural engineering need
New factory construction	Full structural design: frame, footings, slab, hardstand
Racking or heavy equipment install	Slab load assessment, possible reinforcement
Mezzanine addition	New structural design for the mezzanine and its supports
Change of use	Structural adequacy assessment against the new use's loads
Minor cosmetic fit out only	Engineering generally not required if no structural elements are touched

Mezzanines, plant upgrades and change of use

Adding a mezzanine floor inside a factory shed is one of the most common triggers for structural engineering, since the new floor needs its own frame, connections and footings, and the existing structure needs checking to confirm it can support the additional load. Installing new plant or heavy machinery calls for a similar review of the floor and any support structure. A change of use, for example converting a warehouse to a use with heavier operational loads, also requires a structural adequacy assessment even where no physical building work is planned. Read more on load bearing wall assessment for the equivalent process in a fit out setting.

Confirm the trigger

Identify whether the work changes loads, alters structural elements, or changes the building's use.

Engage a structural engineer

Bring in an engineer early, ideally before layouts or racking positions are finalised.

Assessment and design

The engineer assesses the existing structure or designs the new elements required.

Permit documentation

Structural drawings and certification are issued to the building surveyor as part of the permit application.

What happens if you skip the structural engineering step

Proceeding without structural engineering input on work that requires it can result in a building permit being refused, a factory floor or racking system being overloaded, and potential exposure for the building owner if the structure fails to perform as intended. Insurance cover can also be affected where required certification is missing.

Beyond the permit and safety risk, unassessed structural changes can be expensive to unwind. Reinforcing a slab or strengthening a frame after the fact generally costs more, and disrupts operations more, than assessing the load requirements before work begins.

Frequently asked questions

Do I need a structural engineer for a factory?
Yes, for a new factory build or most structural alterations to an existing one, including racking, mezzanines, plant upgrades and change of use. A structural engineer's design and certification is required to obtain the relevant building permit.

What does an industrial structural engineer do?
An industrial structural engineer designs and assesses the structure of industrial buildings, including frames, slabs, footings, hardstands and mezzanines, so the building safely carries its operational loads.

How long does industrial structural design take?
Programme depends on scale and complexity. A racking or slab assessment can be turned around quickly, while a new factory with multiple structural systems takes longer, particularly where council coordination is required.

What structural documentation is needed for a commercial building permit?
A building permit application typically requires structural drawings, engineering computations and a certificate of structural adequacy or design compliance from the engineer, submitted to the building surveyor alongside the architectural documentation.

How are industrial building slabs and hardstands designed?
Slabs and hardstands are designed for the specific loads they will carry, including point loads from racking, rolling loads from forklifts and heavy vehicles, and the subgrade conditions identified in a geotechnical assessment.

For an assessment of your factory's structural requirements, request a quote from Principal Built Engineering.

Previous Next