A practical guide for Australian electricians. The line items everyone forgets, a worked example with real numbers, the manual process, and the 30-second voice version with FlowSpec.
Published 5 May 2026. Updated 5 May 2026.
Switchboard upgrades are some of the highest-value residential jobs a sparkie quotes. They are also the easiest to undercook. Forget a single 16A RCBO and you have eaten your margin on a $4,000 job. Quote 6 hours of labour and find out it took 9 because the meter swap took longer than expected, you have just paid the customer for the privilege of working on their house.
This guide walks through the manual process for quoting a residential switchboard upgrade, then shows the same job done in 30 seconds with FlowSpec. The contrast is the point. The manual process works fine. It just takes 45 minutes after dinner instead of half a minute on the drive home.
What’s Actually In a Switchboard Upgrade
A typical residential switchboard upgrade is replacing a 1980s ceramic-fuse board with a modern enclosure full of RCBOs. Here’s the line-item list most sparkies miss at least one or two of when quoting from memory.
Common Pitfalls
Every electrician has war stories about a switchboard upgrade that ate their margin. Here are the line items that cost the most when they get missed.
If the existing sub-main is a 25-year-old 6mm and the new board needs more capacity, you’re pulling new cable. That’s 16mm or 25mm twin and earth, plus the time to pull it, plus making good. Easy to skim past in a kitchen-table quote and lose $300-$600 in materials and a half-day of labour.
RCBOs are roughly three to five times the price of plain MCBs. Quote 12 RCBOs at MCB pricing and you’ve underquoted by $300 plus on materials alone. Always price each circuit’s protection at what you’re actually fitting, not the cheaper option.
In a lot of states the network has to do the meter swap. That’s a separate callback for you, network paperwork, and time waiting for them. If you don’t price the second visit, you’re working an extra hour for free. Some networks also charge fees that get passed through to the customer; check your state.
A new board is usually a different physical size to the old one. Patching gyprock, paint touch-up, the time to mount surge protection if specified. Easy to forget when you’re focused on the electrical line items.
RCBO and main switch prices have moved noticeably in the last 18 months. If you’re pricing from a memory of what they cost two years ago, you’re wrong by 10-20%. Always check current supplier pricing on the day you quote.
Step-by-Step
Here’s the way most sparkies do it. It works. It’s also why your evenings disappear.
On site, open the existing switchboard. Note the make, model, age, condition. Count the circuits. Check the main switch rating. Look at the sub-main, the earth, and the meter. Take photos of everything. Talk to the customer about what they want, RCBOs on every circuit, surge protection, EV charger ready, future-proofing for a heat pump.
Work out how many poles, how many RCBOs, whether the main switch needs upsizing, whether the sub-main is adequate. Always include 2-3 spare ways for future circuits. Decide brand based on what you trust and what your wholesaler stocks reliably.
Notepad, phone notes, or back of an invoice book. Walk through every line. Board, main switch, RCBOs (count them, don’t guess), neutral bar, earth bar, sub-main cable if needed, conduit, lugs, glands, terminal blocks, labels, and the small bits. The longer you spend here, the less likely you forget something.
Be honest with yourself. A residential 18-pole upgrade with full RCBO replacement is typically 6-10 hours by the time you’ve disconnected, demolished, mounted, terminated every circuit, tested, labelled, and energised. Add time for the network meter swap callback if applicable. Add time for make-good. Then add 1-2 hours for the things you didn’t think of.
Open the wholesaler portal or the supplier PDF. Look up each line item. Note the current price, not what you remember it being last year. RCBOs especially have moved. This is the slowest part of the manual process, and it’s where most sparkies use stale numbers.
Certificate of Electrical Safety, mandatory test of every circuit, network paperwork, photos. Price your time for the testing properly; testing 18 circuits with a Megger and writing it up is real time, not just a tick-box.
Calculate the subtotal, add 10% GST, type the lot into Xero (or your accounting tool), send to the customer. The faster you send, the more likely you win the job.
Worked Example
Here’s a worked example for a typical 1980s home, replacing a ceramic-fuse board with an 18-pole enclosure full of RCBOs. Numbers are indicative and vary by supplier and state; use this as a structure, not a price quote.
Job
3-bedroom 1980s home in Penrith NSW. Existing 8-pole ceramic-fuse board, 80A main, single phase. Customer wants RCBOs on every circuit, 2 spare ways, surge protection. Sub-main is 6mm, needs upgrading to 16mm. 12 final sub-circuits in total: 4 power, 4 lighting, hot water, oven, air-con, and EV-ready spare.
Materials (indicative)
Labour and compliance
Subtotal → add 10% GST → total. Materials run roughly $1,170 indicative; labour and compliance vary by your hourly rate and state. The whole job typically lands in the $3,500-$5,500 range for residential, depending on inclusions.
The Fast Way
The manual process above is sound. It also takes 45 minutes and you usually do it after dinner. Here’s the same quote done from the ute on the drive back to the workshop.
What you say into FlowSpec
“Switchboard upgrade at 14 George Street, Penrith, for John Smith. New 18-pole board, 100A main switch, 12 RCBOs, surge protection. 8 metres of 16mm sub-main, lugs, glands, conduit, terminals, earth stake. Labels and ferrules. 8 hours labour, 1 hour callback for the meter swap, testing on 12 circuits, certificate.”
What FlowSpec does
From the moment you stop talking to the moment the draft is in Xero is around 30 seconds. You review it, fix anything that misheard, hit send. The customer gets a fully priced switchboard upgrade quote before they’ve made dinner.
First 5 sent-to-Xero quotes (or 7 days) on us. Talk through a switchboard upgrade, get a priced Xero quote in 30 seconds. See if it works for the way you actually quote.
Start freeFull access from day one. We'll ask for a card when the trial ends.