Most Perth homeowners who hit a snag with council aren’t sure which approval tripped them up. That confusion is understandable because Western Australia uses two separate regulatory systems to govern what gets built and how it gets built, and conflating them is one of the most common and costly mistakes in the local planning process.
A development approval and a building permit are not the same thing. They sit under different legislation, answer different questions, and are assessed by different parts of your local council. Getting them in the wrong order, or skipping one entirely, can result in stop-work orders, retrospective applications, and fines.
What a Development Approval Actually Controls
A development approval (DA), sometimes called planning approval, sits under the Planning and Development Act 2005 and is assessed by the planning division of your local government. It answers one core question: is this land use or built form appropriate for this location under the relevant planning scheme?
Planning schemes in WA divide land into zones and assign codes that set rules about setbacks, height limits, plot ratios, and the nature of use. If your proposal doesn’t comply with every applicable code, you need a DA. If it does comply, a faster track known as a Deemed-to-Comply assessment may apply, which can bypass the need for a full DA in some circumstances.
A DA doesn’t assess structural safety, waterproofing, or construction standards. It doesn’t care whether your roof framing meets the Building Code of Australia. It only decides whether your project sits appropriately within its planning context.
What a Building Permit Actually Controls
A building permit sits under the Building Act 2011 and is assessed by the building division of your council (or a private building surveyor). It answers a different question: does this structure meet the technical standards for safe construction?
Every building permit in WA requires certified working drawings that show structural elements, materials, fire separation, wet area details, and compliance with the National Construction Code (NCC). The documentation is technical. It’s not a planning document. It exists to protect future occupants and ensure the building performs as intended.
For most residential projects in Perth, you won’t get a building permit until any required development approval is already in hand. The sequence matters.
When You Need One, Both, or Neither
This is where people get caught.
| Project Type | DA Required? | Building Permit Required? |
|---|---|---|
| New single dwelling (code compliant) | Usually no | Yes |
| New single dwelling (non-compliant) | Yes | Yes |
| Patio or carport | Sometimes | Yes |
| Internal renovation (no structural change) | No | Sometimes |
| Granny flat / ancillary dwelling | Yes (in most cases) | Yes |
| Change of use (commercial) | Yes | May be required |
| Pergola under 10m² (uncovered) | No | No |
The thresholds shift depending on your local government area, the applicable residential design codes, and whether your property has any planning overlays. Assuming your project is exempt is a risk. Councils across the Perth metro area are increasingly active in identifying unapproved work, particularly on properties transacting through the real estate market.
The Non-Obvious Issue: Sequencing Errors Are Hard to Reverse
Here’s the part most guides skip. Even when owners know they need both approvals, they sometimes start construction after receiving a DA but before the building permit issues. That’s a breach of the Building Act 2011. Work carried out without a building permit is technically illegal regardless of whether planning consent exists.
Retrospective building permits are possible but expensive. They require as-built drawings, inspections, and sometimes destructive investigation to confirm compliance inside walls and subfloor spaces. Some elements simply can’t be assessed after the fact, which can mean a direction to demolish or modify work at the owner’s cost.
Getting the sequence right from the start, with properly prepared documentation, is far cheaper than fixing it later.
How Your Plans Affect Both Outcomes
The quality of your drawings directly influences both approval pathways. A DA submission built on vague concept sketches will attract more queries from planning officers and slow assessment. A building permit supported by incomplete working drawings will get rejected outright. Both outcomes cost time and money.
Good drafting services Perth help clients prepare documentation that satisfies both sets of requirements simultaneously, rather than preparing a planning set and then reworking everything for the building permit stage. For residential drafting Perth, that means floor plans, elevations, site plans, and sections that planners and building surveyors can each read without requesting further information.
For commercial drafting Perth, the documentation demands are higher still, often requiring change-of-use justification, fire engineering input, and accessibility compliance documentation alongside the standard drawing set.
A preliminary design consultation Perth before you commit to any design direction is the most reliable way to identify which approvals apply to your specific project, what the documentation requirements are, and whether any planning overlays or council-specific policies will create complications.
FAQs
Do I need a development approval for a house extension in Perth? It depends on whether the extension complies with the applicable R-codes and any local planning policies. A compliant single-storey extension to the rear of a dwelling often doesn’t require a DA, but boundary setbacks, lot coverage, and existing approvals on the title all factor in.
Can I get a building permit without a development approval? Yes, if no DA is required for your project. Building permit applications can proceed independently when planning approval isn’t triggered. But if a DA is required, you generally can’t get a building permit until it’s approved.
What happens if I build without a building permit in WA? Under the Building Act 2011, building without a permit is an offence. The council can issue a building order requiring you to stop work, provide documentation, modify the structure, or demolish it. Penalties can be issued and the matter can proceed to prosecution.
Whether you’re planning a renovation, a new home, or a commercial fitout, getting the approval sequence right starts with the right documentation. The team at Domestic Drafting Service has been guiding Perth clients through council processes since 1986. If you’re looking for experienced house plan designers near me who know local council requirements inside out, or you need renovation drafting that satisfies both planning and building requirements from day one, book a consultation with the team at Domestic Drafting Service.