Building designers and architects are the prime movers in devising and designing multiple unit occupancies. Building designers can typically undertake the same work as an architect, though this does differ by State. A building designer should have a relevant tertiary qualification in their field, ideally backed up by sufficient industry experience. Building designers typically have a particular area of expertise, which may cover extensions, renovations and residential, commercial or industrial developments. Besides providing building designs for projects, which typically involves production of 3D CAD plans, diagrams and illustrations - a building designer may also be responsible for other tasks, including:

• preparation of tender documentation
• estimating, quoting and costing a project
• site inspections with the client
• liaison with builders

Considerations for the design and construction of a unit development can include:

• individual client requirements
• physical characteristics of the site
• planning requirements and restrictions
• character of the surrounding area
• sustainable energy requirements

Building designers should all carry Professional Indemnity Insurance, so ensure you confirm this when selecting a designer to work with. It is also advisable to contract a licensed building designer, where their accreditation and qualification can be independently verified. Consultation with your local council is also advisable, as is knowledge of the relevant building codes for your area.