What Affects the Cost
Pre-1970 wiring. Older suburbs frequently have TPS wiring with degraded insulation, which may require partial rewiring ($200–$500 per circuit) alongside the board swap. Rewirable porcelain fuse boxes in these homes are decades past their useful life.
Extreme heat exposure. Switchboards on sun-facing external walls suffer accelerated wear on breaker components and cable insulation. Outdoor enclosures should be rated
IP55 minimum (IP56 typical) with UV-stable materials. Stainless steel offset sun shields reduce radiant heat. Board relocation may be recommended for severely exposed installations.
Sub-mains condition. Aluminium sub-mains cable, common in 1960s and 1970s builds, is an immediate replacement candidate ($600–$1,200). Standard copper sizes are 16mm² for 63A supply (~$5.39/m), 25mm² for 80A or long runs (~$6.27/m).
Asbestos backing. Found in many boards from the 1970s and 1980s. Licensed removal adds $150–$800.
Air conditioning load. Perth's climate means most homes run significant cooling — multiple split systems or large ducted units each needing dedicated circuits (20A–32A). A home running ducted AC, solar, and a pool pump may need a 36-pole board.
Board size for future loads. Solar, battery, and EV charger circuits are increasingly common in Perth. Adding spare ways at install time costs very little — a 36-pole enclosure adds ~$30–$40 over a 24-pole.
Smoke alarms. Since 2009, all WA homes being sold, rented, or hired must have compliant smoke alarms permanently connected to 240V mains. Installation requires a licensed electrician ($140–$350 per alarm).
A standard upgrade in a post-2000 home with accessible board placement, modern wiring, and 10–12 circuits sits toward $950. A pre-1970 home in Fremantle or Subiaco with degraded TPS wiring, aluminium sub-mains, asbestos backing, and a sun-exposed board requiring relocation pushes toward $3,600.
Perth-Specific Considerations
Established inner suburbs. Fremantle, Subiaco, Mount Lawley, Nedlands. Significant numbers of pre-1970 homes with original wiring. These properties often have rewirable porcelain fuse boxes that are decades past their useful life. The wiring itself (rubber or early PVC insulation) frequently fails insulation resistance testing, meaning the upgrade becomes a partial rewire plus board swap — often adding $1,000–$2,500 to the base cost.
Heat management. Perth's extreme summer temperatures are a genuine factor. Switchboards on west-facing brick walls bake in afternoon sun, degrading breaker components faster than in milder climates. For outdoor installations, specify IP55 or IP56-rated enclosures with UV-stable construction and corrosion resistance. Anti-condensation measures (pressure compensation plugs, not drilled weep holes) protect against temperature cycling. If your board is severely sun-exposed, relocating to a shaded wall or installing a stainless steel offset sun shield is worth the additional cost.
WA RCD requirements — strictest at sale. WA has the most punitive RCD requirements of any state. Since August 2009, at least 2 RCDs must protect all power and lighting circuits before a property can be sold — with penalties up to $15,000 for individuals and $100,000 for corporations. The only exception is if the buyer provides written notice the property will be demolished within 6 months. If you are preparing a property for sale, this is often the trigger for a full switchboard upgrade.
Northern and southern growth corridors. Joondalup, Baldivis, Butler, Rockingham. Post-2000 homes with compliant boards. These may need additional circuits for solar or EV chargers — adding an RCBO-protected circuit costs $143–$300.
Western Power manages the distribution network across Perth and the South West Interconnected System. Horizon Power covers regional and remote WA. Meter panel work is Western Power's domain — your electrician handles the switchboard and house wiring only.
Hiring a Licensed Electrician in WA
WA electricians must hold a current electrical licence overseen by Building and Energy (DMIRS). The EnergySafety division handles technical safety regulation, audits, and inspections. After completing a switchboard upgrade, the electrician must lodge a Notice of Completion (NOC) via the eNotice portal — the NOC can only be amended within 7 days. Contractors must retain testing records for a minimum of 5 years.
Verify licences on the Building and Energy website. The NOC is your compliance record — make sure you receive confirmation it has been lodged before final payment.
How We Calculate
Estimates are based on surveyed trade rates for licensed electricians in the Perth metro area, adjusted for property age. All prices include GST. Figures cover standard residential switchboard upgrades. Commercial and industrial work is excluded.