Insurance, claims and the paperwork on a Cranbourne alfresco.

Here is the thing nobody tells you when they quote you a cash job. Home and contents policies in Australia carry a condition, in some form or another, that the insured structures were built lawfully and with the required approvals. It is not fine print designed to trap you - it is how the insurer prices risk, because they are underwriting a structure on the assumption it was engineered and inspected.

A roofed alfresco is a Class 10a structure under the National Construction Code. Over the City of Casey thresholds it needs a building permit. Build it without one and you have handed your insurer a clean, uncomplicated reason to decline any claim on that structure - storm, fire, impact, all of it. And because most alfrescos are attached to the house, the argument does not necessarily stop at the alfresco. If an unpermitted structure fails and takes part of your roof line with it, you are now arguing about the dwelling too.

The permit and engineering on a typical Cranbourne alfresco runs $580 to $1,800. Against a $30,000 to $50,000 structure sitting under a $700,000 house, that is not a cost. It is the cheapest risk transfer available to you. This is also the number one reason we will not build a job without lodging the permit, no matter how nicely we are asked. Our City of Casey permit guide walks through the thresholds and the lodgement.

This one is Victorian law, not policy fine print. Under the Domestic Building Contracts Act 1995, domestic building work over $10,000 requires a major domestic building contract in writing. Once the contracted work exceeds $16,000, the builder must take out Domestic Building Insurance in your name before accepting a deposit or starting work.

DBI is not general liability cover and it is not a warranty. It is a last-resort policy that pays out if the builder dies, disappears or becomes insolvent and your work is incomplete or defective. Most alfresco and outdoor kitchen builds in Cranbourne land between $25,000 and $50,000, which puts essentially all of them over the threshold.

What to actually do about it.

• Ask for the DBI certificate in your name before you pay a deposit. Not after. Not “when the job starts”.
• Check the builder's VBA registration yourself at vba.vic.gov.au. It takes ninety seconds and it is public.
• Get a written major domestic building contract. A one-page quote is not a contract.
• Watch the deposit cap. Victoria limits deposits on domestic building contracts, and a builder asking for 40 percent up front is waving a flag at you.
• If a builder tells you the job is “too small” to need DBI on a $30,000 alfresco, walk away. They are either unregistered or hoping you do not know the threshold.

You bought in Cranbourne East in 2019. The insurer wrote a sum insured based on a four bedroom house with a bare alfresco pad out the back. In 2026 you spend $38,000 turning that pad into a roofed alfresco with a full outdoor kitchen. If you do not ring the insurer, your sum insured still describes a 2019 house, and you are now underinsured by roughly the entire value of the new structure.

Nobody notices until a claim, and at claim time the shortfall is not just the alfresco. Under-insurance can affect how the whole claim is settled. The fix takes one phone call at handover: give the insurer the final contract figure, tell them what was built, and get the revised sum insured confirmed in writing. Do the same for contents if you have put a $6,000 BBQ and a bar fridge out there.

A shape we have seen more than once around the Casey estates. Owner takes a cash quote at $19,000 for a 30 square metre Colorbond alfresco, no permit, no engineering, fixings at whatever spacing the bloke felt like. Three summers later a northerly front comes through ahead of a cool change and lifts the roof sheets, which take out the gutter and part of the house fascia on the way.

• Alfresco rebuild, done properly with permit and engineering: $22,500
• House fascia, gutter and roof line repair: $6,800
• Damaged outdoor kitchen cabinetry and appliances: $9,400
• Total exposure: $38,700
• Insurer's position: unpermitted structure, claim declined on the alfresco, argument on the rest
• What the permit and engineering would have cost in the first place: about $1,150

The cash quote saved roughly $3,500 against a compliant one. It cost $38,700. That is the whole page in one sum. Cranbourne sits in wind Region A5 under AS/NZS 1170.2 and those northerly gusts are exactly what the standard exists to handle - the engineering is not paperwork, it is what tells you the fixing spacing. See our alfresco areas page for how the roof structure is actually engineered.

Will my home insurance cover an alfresco built without a permit?

Assume not. Most Australian home policies contain a condition requiring that structures were built in accordance with the relevant laws and approvals. An unpermitted Class 10a alfresco is not built in accordance with the Building Act, so an insurer has a clean basis to decline a storm or fire claim on that structure. Worse, if the unpermitted structure is attached to your house and the damage spreads, the argument can extend to the main dwelling. The City of Casey permit costs $580 to $1,800 including engineering. It is the cheapest insurance you will ever buy.

Do I need domestic building insurance for my alfresco build?

If the contracted domestic building work is over $16,000, yes, and your builder must arrange it before taking a deposit. Domestic Building Insurance in Victoria covers you if the builder dies, disappears or becomes insolvent and the work is incomplete or defective. It is not optional and it is not the builder's choice. Ask for the certificate in your name before you pay anything. A builder who says the job is too small to bother with, on a $30,000 alfresco, is telling you something important about how they operate.

Does an outdoor kitchen increase my home insurance premium?

It should increase your sum insured, which may move the premium. The mistake we see is owners spending $40,000 on an alfresco and outdoor kitchen and never telling their insurer, so the sum insured still reflects the house as it was handed over in 2019. If a storm takes the roof, you are underinsured by the full value of the structure. Ring your insurer when the job finishes, give them the final contract figure, and get the sum insured updated in writing.

What alfresco storm damage do insurers actually see in the City of Casey?

Wind uplift on the roof, overwhelmingly. Cranbourne sits in wind Region A5 under AS/NZS 1170.2, and the northerly gusts that come through ahead of a summer change are what lift roof sheets. The claims almost always trace back to the same two failures: fixings at the wrong spacing or the wrong type, and a roof tied to a structure whose footings were never engineered for uplift. Hail damage to roof sheets and water ingress into cabinetry after driven rain are the next two most common.

What paperwork should I keep after an alfresco build?

Five documents, and keep them together somewhere you will find them in ten years. The City of Casey building permit and the certificate of final inspection. The engineering computations and structural certificate showing AS/NZS 1170.2 compliance. The AS 5601 gas compliance certificate from the licensed gasfitter. The certificate of electrical safety under AS/NZS 3000. And the Domestic Building Insurance certificate plus the signed contract. That folder is what turns a disputed claim into a paid claim, and it is also what a buyer's conveyancer asks for at Section 32.