A pergola with open rafters and a patio with a solid roof can look like the same project at different stages. Under NSW rules they share one set of exempt development standards, but once you add roof sheeting, several extra conditions apply. Knowing them early can save a redesign.
Pergolas compared with patios
In everyday use, a pergola is an open frame of posts and beams, sometimes with battens, a climbing plant or shade cloth over the top. A roofed patio, sometimes called an alfresco area, has a weatherproof roof such as metal sheeting or polycarbonate.
Both fall under one set of exempt rules for decks, patios, pergolas, verandahs and similar structures, found under Part 2, State Environmental Planning Policy (Exempt and Complying Development Codes) 2008. Shade sails and similar structures have their own exempt rules.
Rules that apply to both
Whether or not it has a solid roof, an exempt pergola or patio must:
- Stay on the house side of the building line for each road frontage.
- Keep 900 mm or more from each side or rear boundary in residential zones generally. Rural zones and R5 need 5 m.
- Cover 25 m² at most, with a further combined cap on every deck, patio and pergola on the lot.
- Reach 3 m at most at the highest point, measured from existing ground.
- Keep any floor within 1 m of existing ground.
- Use factory pre-coloured metal with a low reflective finish.
What changes when there is a roof
Gutter line. A roofed structure attached to the house can't extend above the house's gutter line. For a one-storey home with low gutters, this often limits roof pitch or means a flat roof.
Fascia fixing. If the roof connects to the house fascia, that connection must follow an engineer's specifications. A fascia not designed to carry extra roof load, especially wind uplift, is a common failure point.
Roof water. A solid roof collects rain. It must be piped to the stormwater system already on site, without blocking current drainage paths.
Enclosing walls. Walls are capped at 1.4 m. Adding full-height walls, glazing or fixed screens to a roofed patio turns it into an enclosed room. That room is not exempt and needs approval as an addition to the home.
Bush fire. On bush fire prone land, enclosing walls must be non-combustible where the structure is closer than 5 m to a home.
The building code view
Under the National Construction Code, a roofed patio is a Class 10a building. If it sits within 900 mm of a boundary, the fire separation rules in the ABCB Housing Provisions can apply, just as they do for a garage. An open pergola is treated differently. Pergolas are listed among the items that can be built in that 900 mm zone without fire separation.
Structural design also changes. A solid roof attracts much higher wind uplift than open rafters, so posts, beams, footings and tie-downs must be sized for the site's wind and soil. Exempt or not, the structure has to be sound and assembled as the manufacturer specifies.
A change to fire separation for roofed outdoor areas was proposed for NCC 2025 but left out of the final code, which NSW adopts on 1 May 2027. So the current approach is expected to continue for houses.
When approval is needed
A patio needs approval if it is oversized, too tall, too near a boundary, or sits on the street side of the building line. So will one with a roof above the gutter line or walls taller than 1.4 m. A complying development certificate (CDC) under the Housing Code may suit, otherwise a development application goes to council. If the patio sits on a raised deck, check the Deck height and size limits for exempt development too.
CertifiBuild certifies decks, pergolas and patios across NSW. A plan assessment can confirm whether your design is exempt before you buy materials.
Local help across NSW
CertifiBuild certifies Class 1 and Class 10 work in 39 council areas. Local rules on these council pages are a good place to start: Wollongong City Council, City of Ryde, Camden Council, Campbelltown City Council, Wollondilly Shire Council, Shellharbour City Council.
Suburb pages with local planning notes: Gledswood Hills, Gregory Hills, Horsley, Marsfield, Meadowbank, Oran Park, Raby, Silverdale, St Leonards, Tullimbar. You can also browse every service area.
Sources
- Fact sheet on exempt decks, patios, pergolas and verandahs, NSW Department of Planning
- Exempt decks, patios and pergolas, NSW Planning Portal
- Exempt development: shade structures, NSW Planning Portal
- Housing Provisions Part 9.2, fire separation of external walls (ABCB)