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Perth suburbs

Electricians in ThornlieYour street's age says a lot about your switchboard.

By May 1958 Thornlie had 100 occupied homes, and building carried on in stages for decades: Crestwood in the 1970s, Castle Glen and Forest Lakes from the 1980s, the western edge in the early 2000s. Where you live is a fair guide to how old your wiring is. Tell us your job and we'll match you with a licence-checked local electrician for it.

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Updated 29 October 2026 · Written by the Sparky Next Door team · How we check our facts

Thornlie, stage by stage

North-east Thornlie, 1950s and 1960s

The first estate was auctioned after 1954 and development was approved by June 1956. Homes this old can have rewireable fuses, few power points and no safety switches.

South Thornlie and Crestwood, 1970s and 1980s

Crestwood was an upmarket estate planned around shared facilities. Boards from this period vary: some have circuit breakers but too few RCDs for today's rules.

Castle Glen and Forest Lakes

Both aimed at affordable homes for young families, with Forest Lakes building from the 1980s onwards.

Big blocks

Lots are typically 700 to 900 square metres, which brings sheds, pools and long runs out to garden lights.

The numbers

91.1% of homes were separate houses in 2021, 33.3% owned outright and 21.1% rented, across 9,173 private dwellings. Postcode 6108 has 5,741 solar systems on the Clean Energy Regulator's count.

Outdoor power on a Thornlie block

A shed, pool pump or garden lights at the back of a big block means a long circuit outdoors. That's licensed work from start to finish: the cable run, the outdoor power point and the safety switch protecting it. Outdoor power points and garden lighting go into the detail.

If the circuit is feeding a shed with lights and several tools, ask whether it should have its own small switchboard.

What you can do, and what's licensed

You can

  • Work out roughly when your home was built from its part of Thornlie.
  • Press each RCD's test button every three months, as Building and Energy recommends.
  • Note which outdoor things trip the power, and when.

Leave to a licensed electrician

  • Any new outdoor circuit, power point or light.
  • Upgrading an old fuse board.
  • Replacing an RCD that won't reset or fails its test.

Our pick for older Thornlie homes

If you're in the 1950s or 1960s streets and the board still has fuses, we'd sort the board before any outdoor project. A new shed circuit hanging off an old fuse board is doing things in the wrong order.

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Tell us the job and your postcode. We match the licence-checked local electrician who does this kind of work, and they call you. No ring-around, and your number goes to them alone.

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Questions

Straight answers.

How do I know if my Thornlie switchboard is old?

Fuses you pull out, ceramic holders and no test buttons are the giveaways. A device with a test button marked RCD means you have at least some safety switch protection. The switchboard checker helps you tell.

My RCD failed its test. What now?

Building and Energy says a faulty RCD must be replaced immediately, and only a licensed electrical contractor can do it. Until then, the circuits it covers have no safety switch protection, so book it straight away.

Ready for a sparky in Thornlie?

Your postcode and a few quick questions, and we look for the licence-checked local specialist for your job.

Where this information comes from

Rules change, so check with your state regulator if something matters to your job. How we write and check these pages.

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