Building a pergola: materials, approvals and getting quotes

What building a pergola involves

The job starts with footings — posts set into concrete — then the frame, then whatever goes on top. An open pergola is just the frame and rafters, for dappled shade and climbing plants. A roofed pergola adds sheeting: polycarbonate for light and weather protection, or Colorbond and insulated panels for a solid, cooler roof that turns it into a true outdoor room. Attaching to the house is usually cheaper than a freestanding structure, which needs more posts and bracing.

Materials set the character and upkeep. Treated pine is the budget frame; hardwood and steel cost more but last longer with less maintenance. Pergolas are built by carpenters, outdoor-structure specialists and builders — for anything roofed or attached to the house, you want someone comfortable treating it as a proper structure, not just a decorative frame.

How the cost works

Pergolas are priced per square metre of covered area, so size is the core driver, with material and roofing as the big multipliers. A small open pine pergola attached to the house sits at the low end; a roofed timber or steel entertaining pergola in the middle; and a large hardwood or architectural structure with insulated panels, lighting and a fan at the top. The calculator on this page gives an indicative feel for your size and spec.

Beyond size, the levers are the roof and the site. Open rafters are cheapest, polycarbonate mid-range, insulated Colorbond the dearest — and a solid roof usually means gutters and stormwater have to be connected, which is easy to forget in a quote. Sloping ground, difficult access and council approval requirements all add cost and time before a single post goes in.

Approvals and choosing a builder

Pergola work is building work, and whether it needs a licensed builder depends on your state and the job's size and value — many pergolas sit above the threshold where a licence is required, so check locally and always verify ABN and insurance. Just as important, many councils require approval above a certain size or height; building first and asking later can mean fines or removal, so confirm what applies before you start.

A good pergola quote names the material and profile, states whether the roof includes guttering and stormwater connection, and is clear on footings and post sizes. Ask to see a finished job in the same material and roof type. If it's attached to the house, the flashing where it meets the wall is where cheap jobs leak — worth asking how that's detailed.

Mistakes to avoid

Pergola regrets tend to be the invisible ones — skipped approvals, a solid roof with nowhere for the water to go, or undersized footings — plus choosing a material without weighing the upkeep it commits you to.

• Building before checking whether your council requires approval for the size and height
• Forgetting that a solid roof needs gutters and stormwater connected
• Not confirming footing and post sizes, especially on a freestanding structure
• Choosing treated pine on looks alone without weighing the repainting and rot upkeep
• Overlooking how flashing is detailed where an attached pergola meets the house wall
• Comparing quotes without matching material and roof type across them