Pergola vs verandah: when does adding a roof need a permit?

Key points

• An open pergola that lets rain through can be exempt within limits.
• Any waterproof roof, including louvres and polycarbonate, generally makes it a verandah or patio.
• Roofed, attached structures almost always need a permit.
• Adding a roof later often means new footings and engineering.
• If a roof is likely, design and permit for it from the start.

The difference in one sentence

A pergola is an open frame that lets rain through. A verandah or patio cover has a roof that keeps rain out. That single difference usually decides whether you need a permit.

Why open pergolas can be exempt

In Victoria, Schedule 3 of the Building Regulations 2018 exempts an open pergola from needing a building permit if it stays within limits on height and floor area, and sits no further forward on the lot than set distances from the front of the house.

In Queensland, the Building Regulation 2021 treats only small, low class 10 structures as accepted building work. A small, low open pergola may fall within this, but larger ones generally need building approval.

In both states, an exempt pergola must still be soundly built and meet the siting rules.

What counts as a roof

Once a waterproof covering is added, the structure is generally treated as a verandah or patio cover. That includes:

• Colorbond or other metal sheeting
• Polycarbonate or other clear roofing
• Glass
• Insulated roof panels
• Opening louvres, which close to keep out rain
• Retractable canopies fixed to a frame

Shade cloth and shade sails can be treated differently, depending on the state, the product and how they are fixed, so check the specific design.

Why a roof changes the rules

A roof changes how a structure behaves. It catches wind, carries rain and sometimes snow or debris loads, and it sheds water that needs to go somewhere. It can also change light, privacy and fire separation for neighbours. Those are the things the building rules are designed to manage, so roofed structures are assessed more closely.

Roof water also has to go somewhere. A roofed structure needs gutters and downpipes connected to a proper stormwater point, which is another thing the permit checks.

Planning for a roof later

A common story: someone builds an exempt open pergola, then a year later adds polycarbonate or louvres. At that point it needs a permit, and the existing posts, beams and footings may not be strong enough for the roof and the wind load it brings. The result can be a redesign, new footings or a structure that can't be approved as built.

If there is any chance you'll want a roof:

• Design it as a roofed structure from the start, with footings and engineering to suit.
• Permit it once, as a verandah or patio, before you build.
• Check the siting. A roof can push a structure over the boundary or site coverage limits.

Attached or freestanding

Attaching a pergola to the house affects how it is classified and how it connects to your home's structure and roof drainage. An attached, roofed structure is the classic verandah, and it almost always needs a permit. See verandah permits.

Side by side

The table is a simplification. The exact limits, and how a particular product is classified, depend on your state's rules and the details of the design. Your building surveyor or certifier makes the final call, so if you're unsure, check before you buy.

Check your design

Run the free check to see whether your pergola is likely to be exempt or needs a permit, and whether it meets the siting rules on your block. If it needs a permit, or you're adding a roof, we take care of it from site plan to approval. See pergola permits.