Do I need a certifier to renovate my bathroom?

Yes, if the renovation involves changes to the waterproofing membrane, structural modifications, or relocation of wet area fixtures. Simple like-for-like replacements (swapping taps, replacing tiles on existing waterproofing) may not require certification, but any work that touches the waterproofing layer does.

Will my old kitchen need to meet current building codes?

Generally no. Only the new work must comply with the current NCC. However, if you are significantly altering the kitchen (e.g., removing walls, changing the layout), the new work and its interface with the existing structure must comply. Some jurisdictions require smoke alarm upgrades throughout when major work is done.

How much does certification for a renovation cost?

Renovation certification typically costs $1,500 to $5,000 depending on the scope of work, complexity, and location. Simple single-room renovations sit at the lower end. Major whole-house renovations and extensions cost more due to the additional assessment and inspections required.

Do I need a certifier to renovate my bathroom?

Yes, if the renovation involves changes to the waterproofing membrane, structural modifications, or relocation of wet area fixtures. Simple like-for-like replacements (swapping taps, replacing tiles on existing waterproofing) may not require certification, but any work that touches the waterproofing layer does.

Will my old kitchen need to meet current building codes?

Generally no. Only the new work must comply with the current NCC. However, if you are significantly altering the kitchen (e.g., removing walls, changing the layout), the new work and its interface with the existing structure must comply. Some jurisdictions require smoke alarm upgrades throughout when major work is done.

How much does certification for a renovation cost?

Renovation certification typically costs $1,500 to $5,000 depending on the scope of work, complexity, and location. Simple single-room renovations sit at the lower end. Major whole-house renovations and extensions cost more due to the additional assessment and inspections required.

Building Certification for Renovations and Extensions

When certification is required

Not all renovation work requires a building certifier. Structural changes, wet area modifications (bathrooms, kitchens, laundries), changes to the building envelope (walls, roof, windows), and work affecting fire safety all require certification. Extensions of any size generally require certification.

Minor cosmetic work (painting, replacing fixtures, installing shelving, simple landscaping) generally does not. When in doubt, consult a certifier before starting work. Unpermitted building work can affect insurance, resale value, and legal liability.

How existing buildings are treated

Generally, only the new work must comply with the current NCC. Your existing house does not need to be brought up to current standards for everything. However, some jurisdictions require certain upgrades when major renovation work is undertaken.

Common required upgrades include installing smoke alarms throughout the existing dwelling (not just in the new section), and in some states, upgrading electrical wiring in areas being worked on. Your certifier advises on which requirements apply to both the new and existing parts of the building.

The certification process for renovations

The process follows the same pattern as a new build: plans are assessed for NCC compliance, a construction certificate or building permit is issued, inspections are conducted at mandatory stages, and an occupation certificate is issued when the work is complete.

For renovations, the plan assessment stage is where the certifier determines how the new work interfaces with the existing building structure, fire safety systems, and other compliance elements. This assessment is often more nuanced than for a new build.

Heritage and older buildings

Renovating heritage-listed buildings or older structures presents additional certification challenges. The NCC requirements for fire safety, accessibility, and structure may conflict with heritage conservation objectives.

Performance-based solutions (alternative approaches to compliance that achieve the same outcome without strictly following the deemed-to-satisfy provisions) are commonly used for heritage renovations. Engaging a certifier experienced in heritage work is strongly recommended.