As a development grows from a dual occupancy into a multi-unit project, the structural engineering scope changes meaningfully — not just in scale, but in how many other consultants and approval bodies the structural design needs to coordinate with. For developers and project managers, understanding this coordination process is often as important as understanding the engineering itself.

• 25 August 2026
• Komal Chauhan

Why Multi-Unit Projects Add Coordination Complexity

A multi-unit development typically involves a larger design team — architect, town planner, civil engineer, building surveyor, and often a geotechnical engineer alongside the structural engineer. Structural design decisions need to work within constraints set by each of these disciplines: architectural layout, civil stormwater and drainage design, and building surveyor compliance requirements all interact with the structural design rather than sitting separately from it.

Where Structural Engineering Intersects with Other Disciplines

• Architecture — unit layouts, floor-to-floor heights, and shared wall configurations all have structural implications that need to be resolved collaboratively, not handed to the engineer as a fixed brief
• Civil engineering — stormwater detention and drainage design can affect footing and basement design, particularly on tighter multi-unit sites
• Building surveyor requirements — fire rating, structural fire resistance, and compliance certification requirements shape material and structural system choices, especially for larger multi-unit buildings
• Geotechnical input — larger developments often warrant a dedicated geotechnical investigation, rather than relying on general soil classification, given the scale of footing and foundation decisions involved

Common Structural Systems in Melbourne Multi-Unit Projects

Depending on scale and site conditions, structural design for multi-unit developments typically involves considerations around:

• Shared/party wall design between units
• Common area and stair/lift core structural design
• Basement and undercroft parking structural design, where included
• Balcony and cantilever design, which carries specific waterproofing and structural detailing requirements

Managing the Approval Sequence

Multi-unit developments generally move through planning permit approval before building permit documentation is finalised, and structural design often needs to be developed in stages — a concept-level structural approach to support planning approval, followed by detailed design once planning conditions are known. Managing this sequence well avoids the common problem of detailed structural work being completed prematurely, only to require rework once planning conditions are issued.

Why Early, Coordinated Engineering Input Reduces Risk

The projects that run most smoothly tend to be the ones where the structural engineer is engaged early enough to flag constraints — site, geotechnical, or compliance-related — before they’re baked into an architectural design that’s difficult to adjust. Late-stage structural surprises on multi-unit projects are typically more expensive and disruptive to resolve than the same issue caught during concept design.

EMS Engineering Consultancy works as part of the broader consultant team on multi-unit developments across Melbourne, coordinating structural design with architecture, civil engineering and building surveyor requirements from early concept through to construction-ready documentation.