Renovation Permit Rules and How to Check Before Work Starts

You have a quote, a builder who can start next month and a rough plan for the kitchen wall, and nobody has mentioned approvals. Skip the renovation permit question now and it tends to come back at the worst moment: when a buyer's conveyancer asks for the paperwork, or when your insurer reads the claim file. A few hours of checking before work starts can save you months of retrospective approvals later.

I have managed renovations on four of my own homes and helped plenty of friends through theirs. This is the order I check things in, and what each step usually costs.

Which jobs need a renovation permit

Rules differ between councils, states and countries, so treat this as a map of where approvals usually apply rather than a legal answer for your address. In most places the line falls between cosmetic work and anything that touches structure, plumbing, drainage, gas, fire safety or the outside footprint of the house.

Two categories catch people out. Heritage overlays can restrict even minor street facing changes, and strata or body corporate rules can require consent for work inside an apartment, such as replacing floors that affect noise below.

How to check your renovation permit requirements in five steps

1. Look up your property's zoning and overlays. Most councils have a free online property report or planning map. Search your address and note the zone and any heritage, flood, bushfire or vegetation overlays. This takes 15 minutes.
2. Read the exempt development list. Many councils and state governments publish a list of works that do not need approval if they meet set conditions, such as a deck under a certain height or a shed under a certain floor area. Check every condition, not just the headline.
3. Call the council duty planner. Most councils offer a free phone or counter service. Describe the job in plain terms and ask two questions: does this need planning approval, and does it need building approval. Write down the name of the person and the date.
4. Talk to a private building surveyor or certifier if the answer is yes. In many places they issue the building permit and inspect the work. Expect fees from around 1,500 dollars for a small job to 4,000 dollars or more for an extension.
5. Get approvals in writing before signing a building contract. Make the contract start date depend on the permit being issued, so you are not paying a builder to wait.

What doing it without approval really costs

Unapproved work does not always lead to a fine, but it reliably creates costs later.

• Selling becomes harder. Buyers' building inspectors and conveyancers look for missing approvals. Many buyers will ask for a price reduction or walk away, and some lenders will not value unapproved rooms.
• Insurance may not pay. If a fire or leak starts in an unapproved area, the insurer may argue the work was not built to code.
• Retrospective approval is expensive. Getting a certificate after the fact can mean opening walls so an inspector can see framing or waterproofing, plus engineer reports. Costs of 5,000 to 15,000 dollars are common for a single room.
• Councils can order removal. It is rare for small jobs, but it does happen with decks, carports and extensions near boundaries.

Do not just trust your builder on permits

The most common advice I hear is "your builder will know if a permit is needed." Most good builders do. But I would not rely on it, and here is why.

A builder's quote is often lower when approvals are left out, and some trades are honestly unsure where the line sits for your particular overlay. More importantly, in most places the legal responsibility for approvals sits with the owner, not the builder. If a tradesperson tells you a job does not need a permit and they are wrong, you carry the problem at sale time. Ask the builder's opinion, then confirm it yourself with the council in writing. It costs one phone call.

The same applies to structural work. If anyone suggests a wall "is not load bearing" without an engineer looking at it, read our guide on what removing a load bearing wall really costs before you agree.

Building the permit into your budget and timeline

Approval time is the part people underestimate. Exempt works can start straight away. A simple building permit through a private certifier often takes 2 to 4 weeks. Anything that needs planning approval can take 2 to 6 months, longer if neighbours object.

When collecting quotes, ask each builder to list approvals as a separate line: who lodges them, what fees are included and how many inspections are allowed for. That makes quotes easier to compare, and our walkthrough on how to compare renovation quotes covers the other lines worth checking. Keep every permit, inspection certificate and compliance certificate in one folder, digital and paper. When you sell, that folder answers buyers' questions before they turn into price cuts. More planning advice is in our renovation section.

Frequently asked questions

Do I need a permit to renovate a bathroom?

A cosmetic update with the same layout often does not need one, but moving the toilet, shower or drains usually involves licensed plumbing work that must be lodged. Waterproofing may also need a compliance certificate. Check with your council and plumber before demolition starts.

What happens if you renovate without a permit?

You may face a fine or an order to fix or remove the work, though that is less common for small jobs. The bigger risks are insurance disputes and problems when you sell, since buyers and lenders look for approvals. Retrospective approval is possible but usually costs more than doing it upfront.

How long does it take to get a renovation permit?

A simple building permit through a private certifier often takes 2 to 4 weeks. Jobs that also need planning approval can take 2 to 6 months. Heritage areas and neighbour objections add more time, so apply before you lock in a builder's start date.