Change of Use Building Certifiers

A change of use, also known as a change of building classification, occurs when a building is repurposed from one use to another, such as converting a warehouse to residential apartments, a house to a medical practice, or a retail shop to a restaurant. Under the National Construction Code, the building classification determines which fire safety, structural, accessibility, and amenity requirements apply. When the use changes, the building must be assessed against the requirements of the new classification, and a building certifier must certify that the building meets those requirements before the new use commences.

Change of use projects are among the most complex building certification engagements because they require assessment of an existing building against current NCC standards for the new classification. The existing building was likely constructed under a previous edition of the building code and for a different use, meaning that significant upgrades may be required to meet the current requirements. Common areas where upgrades are needed include fire safety (upgraded detection, sprinklers, fire-rated construction, emergency egress), accessibility (new accessible entrances, toilet facilities, paths of travel), mechanical ventilation (particularly for hospitality uses), and structural capacity (if the new use involves different loading requirements).

The certifier's role in a change of use project is to assess the existing building against the current NCC requirements for the new classification and determine what work is needed to achieve compliance. This often involves a detailed survey of the existing building to establish its current compliance status, followed by a gap analysis identifying the upgrades required. Performance solutions may be appropriate where full deemed-to-satisfy compliance is impractical or prohibitively expensive, particularly for heritage buildings or buildings with significant structural constraints.

Planning approval from the local council or planning authority is usually required before a change of use can proceed, as the change may affect car parking requirements, noise considerations, operating hours, and neighbourhood amenity. The building certification process is separate from the planning approval but must be coordinated with it. Some changes of use trigger both planning and building compliance requirements, and the certifier can advise on the building certification timeline in the context of the broader approval process.

The cost of change of use certification varies significantly depending on the extent of upgrade work required. Simple changes of use where the existing building largely complies with the new classification's requirements might cost $3,000 to $5,000 for the certification component. Complex changes of use involving significant fire safety upgrades, structural modifications, and accessibility works can cost $10,000 to $30,000 or more for certification, reflecting the extensive assessment work involved. A feasibility assessment by a building certifier early in the project planning phase can identify the likely compliance requirements and associated costs, helping to inform the commercial viability of the proposed change of use.