A city that rebuilt itself after Tracy
Cyclone Tracy crossed the coast near Fannie Bay early on Christmas Day 1974. It destroyed about 80 percent of Darwin's houses, and the Darwin Reconstruction Commission set out in 1975 to rebuild the city to stricter cyclone code standards. So a lot of Darwin's housing dates from that rebuild or later.
The NT Government says homes built since Tracy in the Territory's cyclonic areas are generally designed to withstand a mid range Category 4 cyclone, with winds of 225 to 279 km/h. When Cyclone Marcus, a Category 2 storm, crossed in March 2018, it was the strongest to hit Darwin since Tracy but caused relatively little structural damage, partly because of improved building codes.
What that means for a garage door
Under the NCC 2022 Housing Provisions, a garage door in an opening up to 3 m high in wind region C or D must meet AS/NZS 4505. The NT has not adopted NCC 2025. Steel-Line says new homes in cyclone-prone parts of northern Australia must now use wind-resistant garage doors, installed to the current code.
Your house plans should show the wind classification for your site. Ask for a door rated to it, and keep the door's paperwork with the plans.
Upkeep between cyclones
The NT Government's inspection guide makes a point worth repeating: it may be many years between severe cyclones, and often only one weak element needs to fail for damage to rise sharply. It says humidity, heavy rain, strong winds and long dry spells can loosen fixings over time, and that corrosion hits bolts, fixing plates and metal cladding hardest close to the coast.
For a garage door, that means the guides, brackets and fixings that hold it to the house. The guide suggests a visual check every year.
Around Darwin
Cyclone season
Steel-Line notes cyclones can reach Australia's northern coast each year from November to April. Have the door checked before the season, not during it.
Older suburbs
The NT guide warns that where buildings that survived Tracy remain without upgrading, there could be more debris risk. An old, unrated door is worth a second look.
Registration
The NT's Building Practitioners Board issues Building Contractor Residential registration, which ABLIS says is needed for work on houses above a set value.
Wiring
Plugging an opener into a power point is not electrical work under NT law. A new power point needs an electrical work licence, and you get a certificate of compliance within 20 business days.
Before the door specialist calls
- Your house plans, which show the wind classification for the site
- What kind of door it is: roller, sectional or something else
- Any rust on the guides, brackets or bottom rail
- If you want a motor, where the nearest power point is
What we would do
Book the door's check in October, before cyclone season, and ask for the fixings to be looked at as well as the springs and motor. A door with perfect springs can still fail if the brackets holding its guides have rusted.