A knockdown rebuild in Canberra rarely stalls because of the build itself. It stalls at the paperwork stage: the Development Application (DA) and Building Approval (BA) the ACT requires before a wall comes down. This guide covers both, in order, starting with whether your block is DA-exempt and finishing with the inspection that lets you move in.
DA and BA are not the same approval
Two separate processes cover a Canberra knockdown rebuild, and mixing them up causes most early delays.
Development Approval checks planning: the Territory Planning Authority assesses your design against the Territory Plan, covering setbacks, height, block coverage, overshadowing and streetscape fit.
Building Approval checks construction: a licensed certifier reviews your structural engineering, energy rating and specifications against the National Construction Code.
A DA, where required, must be finalised before the BA can be lodged, or the application gets sent back before assessment starts.
Does your knockdown rebuild actually need a DA?
Not always. Under the Planning (Exempt Development) Regulation 2023, a new single dwelling can skip DA approval if it meets several conditions:
- it will be the only home on the block
- the design fits standard residential setback and building envelope controls
- written notice of the works has gone to your neighbours, and
- the block has no complicating factor, such as a heritage listing or loose-fill asbestos affected status (what locals often call the Mr Fluffy program)
Demolition has a similar exemption. A standalone house that does not share a party wall with a duplex or townhouse can usually come down without a DA, provided you meet the same criteria, notify neighbours in writing, and lodge a demolition notice with WorkSafe ACT at least five business days before work starts. Heritage-listed homes are the main exception.
If your design pushes past those limits, whether that is a larger footprint, an extra storey the block does not allow, or an overshadowing problem, DA approval in Canberra stops being optional. At that point you need full council approval for the rebuild, not a self-check.
Lodging the Development Application
Your architect or planning consultant lodges the DA through the ACT Government’s eDevelopment portal, with a site plan, floor plans, elevations, shadow diagrams and a planning report attached. The Authority runs a completeness check first, usually five to ten working days, before formal assessment begins.
Timing then depends on the track. A code-track application is meant to be decided within 20 working days. Most single-dwelling rebuilds sit in the merit track instead, running 30 working days if nobody objects during public notification, or 45 if representations are lodged. This is the stage most homeowners mean by the Canberra knockdown rebuild approval timeline, and it pays to budget beyond the statutory minimum: larger significant-development applications have run well past their 60-day target in recent years.
Building Approval and the ACT building approval process
Once the DA is granted, or immediately if your rebuild is DA-exempt, a building certifier takes over and checks:
- structural engineering drawings and footing design, backed by a soil test
- an energy efficiency assessment, such as a NatHERS or Section J report
- stormwater and drainage plans
- a bushfire assessment, where relevant
- overall compliance with the National Construction Code
This technical half of the ACT building approval process usually moves faster than the DA stage, since there is no public notification involved. The certifier confirms the house is safe and code-compliant, not whether neighbours like the design.
Commencement notice and inspections
Building Approval alone does not let work start. A commencement notice must confirm the BA is in place and a licensed builder is appointed before demolition or construction can legally begin.
From there, inspections happen at set stages: footings and slab, structural framing, waterproofing, and a final check before occupation. Skipping one, or building ahead of an approved stage, is a costly mistake, since rework to satisfy a missed inspection usually costs more than waiting would have.
What actually delays a knockdown rebuild in Canberra
Most hold-ups trace back to a handful of avoidable issues:
- incomplete documentation at lodgement, which restarts the completeness check
- a design that clips setback or overshadowing rules and needs reworking mid-assessment
- a heritage overlay or asbestos flag not identified early
- objections during public notification that extend the assessment
- soil or engineering reports arriving after the BA has already been lodged
Bringing in a certifier, and an architect where a DA looks likely, before you settle on a floor plan tends to save weeks later. KDA Construction Group runs through this exemption and documentation check with clients at the start of a project, mainly to avoid a redesign once a DA is already in the queue.
Planning your own Canberra knockdown rebuild
Every block in Canberra carries its own mix of setbacks, overlays and site conditions, so the fastest way to know where you stand is a straight answer from someone who works through ACT approvals regularly. KDA Construction Group manages the DA and BA process alongside the build itself, coordinating with architects and certifiers so nothing sits waiting longer than it needs to. If you are weighing up a knockdown rebuild, get in touch with KDA Construction Group for a site assessment.
Frequently asked questions
Do I need a DA for a knockdown rebuild in Canberra?
Only if your project falls outside the exemption criteria in the Planning (Exempt Development) Regulation 2023. Many single-dwelling rebuilds qualify as DA-exempt if the design meets standard setback rules and neighbours have had written notice.
What is the difference between DA and BA approval in the ACT?
DA approval in Canberra checks planning matters, such as setbacks, height and overshadowing. BA checks technical construction compliance against the National Construction Code. Where both apply, the DA must be finalised first.
How long do Canberra building permits and approvals take?
A code-track DA is meant to take 20 working days. Merit-track DAs, which cover most single-dwelling rebuilds, run 30 to 45 working days. Building Approval typically adds a few more weeks, plus time for the commencement notice.
Can I demolish my house without council approval?
Often, yes. A standalone single dwelling that does not share a party wall can usually be demolished without a DA, provided you notify neighbours in writing and notify WorkSafe ACT before work starts. Heritage-listed homes are the main exception.
Who should I hire first for a Canberra knockdown rebuild approval?
Start with an architect or planning consultant if a DA looks likely, since they prepare and lodge it. A certifier takes over for Building Approval once the DA, or exemption, is confirmed, and your builder steps in once the commencement notice is issued.