How To Quote Switchboard Upgrades (Without Getting Caught Out)

A switchboard upgrade looks like a tidy little job from the front door. Swap the board, fit some safety switches, done by lunch. Then you open it up and find ceramic fuses, an asbestos backing panel and earthing that hasn’t been touched since the Whitlam government.

Switchboard work hides more cost than almost anything else a sparky quotes. Here’s how to price it so the surprises don’t come out of your margin.

Know the typical ranges first

So you’ve got a sense of the territory, here’s where switchboard work tends to land in 2025-26. Treat these as ballparks, not a price list, they move with your area, the board and what you find inside.

• Single-phase board replacement: $1,500 - $3,500
• Three-phase replacement: $2,500 - $5,000+
• Adding safety switches to existing board: $400 - $800
• Per extra circuit added: $200 - $500

If your gut number is well under these, you’ve probably missed something. If it’s well over, you’d better be able to point at why.

The cost drivers that actually move the price

The board itself is the cheap part. What moves the quote is everything around it:

• Number of circuits — a small home might be 8-12, a place with aircon, solar and an EV charger can be 20+
• Condition of the existing board and wiring — tidy and modern, or a rat’s nest
• Single vs three phase — three phase is a different job
• Metering changes — if the meter or supply arrangement changes, that’s distributor coordination and cost
• Asbestos backing — common on pre-1990 boards, must be removed by a licensed person, budget $200-$800 and don’t touch it otherwise

Price the drivers, not the board.

The compliance trigger that expands the scope

Here’s the one that catches people. The moment you start work on an old board, the AS/NZS 3000 Wiring Rules can pull more into scope than the customer asked for, particularly RCD (safety switch) coverage on final subcircuits.

You can’t just like-for-like an old board if doing so leaves it non-compliant. That “simple swap” can legally require safety switches across circuits that never had them, which means more labour, more devices, more cost. Quote the compliant job, not the job the customer pictured.

The detail varies by state regulator, so confirm against current rules, but the principle holds: touching the board can trigger broader compliance work.

What usually forces the upgrade

Knowing why the customer’s calling helps you scope it. The common triggers:

• Ceramic fuses or no safety switches
• Planned solar or an EV charger
• Adding aircon
• Selling the house
• The board tripping constantly

Each of those hints at what else the job needs. Solar and EV mean capacity. A sale means compliance. Constant tripping means something’s already wrong.

Build the price, don’t guess it

A switchboard quote is the same maths as any other job, it’s just got more places to hide cost. Build it up:

1. Labour hours for the actual tasks (see estimating labour hours), loaded for an old or awkward board
2. Materials — board, devices, cable, plus the asbestos and metering line items if they apply
3. Contingency for what you’ll find once it’s open
4. Margin on top — set a target and work back, don’t just add a markup and hope

The sparkies who get caught out are the ones who quote a gut number and discover the asbestos on the day. The ones who don’t are the ones who built the price from the work. That build-up method is the backbone of the Electrical Estimating Course.

A switchboard quote isn’t about the board. It’s about everything you’ll find behind it. Price for that.