Updated November 2026·Independently researched·11 min read
Commercial solar in Perth runs $22,000–$33,000
for a 30 kW system installed, after STCs, GST included - other sizes and site works below
In Perth a 30 kW commercial solar system costs $22,000–$33,000 installed after STCs, $27,000 typical. A Kewdale transport yard sizing up to 100 kW compares that with $70,000–$110,000; a Leederville cafe at 10 kW compares it with $8,000–$12,000.
-2.0%Commercial Solar costs in Perth are down around 2.0% over the past year, re-verified against 90+ sources in November 2026.Year on year
Typical 30 kW commercial system in Perth
$27,000
30 kW installed after STCs, Perth 2026, GST included
30 kW commercial system
$22,000-$33,000
50 kW commercial system
$35,000-$55,000
100 kW commercial system
$70,000-$110,000
$22,000$27,000$33,000
Perth prices commercial solar by system size first: $8,000–$12,000 for a 10 kW system on a small shop or office, $15,000–$26,000 for 20 kW, $22,000–$33,000 for 30 kW, $35,000–$55,000 for 50 kW and $70,000–$110,000 for 100 kW, all installed after STCs. Per watt that is $0.70–$1.20, with the wide Canning Vale and Welshpool sheds at the low end.
The site decides the rest of a Perth quote. Tilt frames on a St Georges Terrace or Elizabeth Quay tower roof need a structural engineering report at $800–$2,000, crane or cherry picker hire at $1,000–$3,000 a day and a loading-dock booking; a flat Colorbond roof on a Wangara or Malaga unit takes the same panels with a ladder and a hoist. Older boards in Fremantle warehouses and Subiaco shopfronts add a switchboard upgrade at $1,500–$5,000.
Systems over 30 kW can be asked to pay network upgrade or connection works at $2,000–$10,000, and commercial panel cleaning once the array is running costs $5–$15 a panel. Prices include GST.
Quick answerCommercial solar in Perth runs $22,000–$33,000 for a 30 kW system in 2026, with roof type, switchboard condition and network connection works setting the total. All figures on this page include GST. Get free Perth quotes →
Commercial Solar Prices in Perth 2026: Cost Table and Price List
Service
Low
Typical
High
10 kW commercial system (small shop / office)
$8,000installed
$10,000
$12,000
20 kW commercial system
$15,000installed
$20,000
$26,000
30 kW commercial system
$22,000installed
$27,000
$33,000
50 kW commercial system
$35,000installed
$44,000
$55,000
100 kW commercial system
$70,000installed
$88,000
$110,000
Installed cost per watt, commercial (after STCs)
$0.70per W
$0.90
$1.20
Structural engineering report
$800report
$1,200
$2,000
Switchboard upgrade for a commercial system
$1,500per job
$3,000
$5,000
Network upgrade / connection works (systems over 30 kW)
$2,000per job
$5,000
$10,000
Crane or cherry picker hire
$1,000per day
$2,000
$3,000
Commercial panel cleaning
$5per panel
$10
$15
Scoping commercial solar work in Perth? Get a quote from a local commercial contractor - free, no obligation.
What does a 30 kW commercial solar system cost in Perth?$22,000–$33,000 installed after STCs, $27,000 typical. The next sizes: $35,000–$55,000 for 50 kW and $70,000–$110,000 for 100 kW.
What site works get added to a Perth commercial solar quote?A structural engineering report at $800–$2,000, a switchboard upgrade at $1,500–$5,000 where the board is old, network upgrade or connection works at $2,000–$10,000 on systems over 30 kW, and crane or cherry picker hire at $1,000–$3,000 a day for tower and tilt-frame roofs.
Worked Commercial Solar Cost Scenarios — Perth
Perth examples priced from this page's rows: a Kewdale transport depot, a West Perth office building and a Swan Valley winery. Each line names the row it uses; the quote you receive prices your own roof and switchboard.
Kewdale transport depot. A freight operator in Kewdale fits 100 kW across a long north-facing shed at $70,000–$110,000, $88,000 typical. The system is over 30 kW, so network upgrade or connection works are quoted on their own line at $2,000–$10,000, and crane hire at $1,000–$3,000 a day gets the panel pallets up.
West Perth office building. The owner of a three-storey West Perth office puts 30 kW on tilt frames at $22,000–$33,000. The concrete roof gets a structural engineering report at $800–$2,000 before the frames are fixed, and the main switchboard is upgraded at $1,500–$5,000 to accept the inverter.
Swan Valley winery upkeep. A cellar door in the Swan Valley runs a 20 kW array installed at $15,000–$26,000 and budgets commercial panel cleaning at $5–$15 a panel each spring, after a summer of red dust from the vineyard tracks and the easterlies.
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Perth commercial solar reaches from the transport and manufacturing belt at Kewdale, Welshpool and Canning Vale, through Bibra Lake, Malaga and Wangara, to CBD and West Perth towers, Fremantle's port warehouses, retail in Subiaco, Leederville and Scarborough, and the market gardens and wineries of Wanneroo and the Swan Valley.
Kewdale, Welshpool and Canning Vale sheds - Transport and wholesale roofs take 100 kW arrays at $70,000–$110,000, the size at which the installed cost per watt is closest to the $0.70 floor of $0.70–$1.20.
Bibra Lake, Malaga and Wangara units - Workshops and factory units buy 30 kW to 50 kW at $22,000–$33,000 to $35,000–$55,000; anything over 30 kW carries network upgrade or connection works at $2,000–$10,000.
CBD and West Perth towers - Tilt frames over concrete need a structural engineering report at $800–$2,000 and crane or cherry picker hire at $1,000–$3,000 a day, on top of a 20 kW or 30 kW system at $15,000–$26,000 or $22,000–$33,000.
Fremantle, Subiaco and Scarborough retail - A cafe, bar or shop fits a 10 kW system at $8,000–$12,000; Fremantle's heritage warehouses and Subiaco's older shopfronts are where a switchboard upgrade at $1,500–$5,000 joins the quote.
Wanneroo and Swan Valley growers - Packing sheds and coolrooms run 30 kW to 50 kW at $22,000–$33,000 to $35,000–$55,000, with commercial panel cleaning at $5–$15 a panel after the dusty months.
What a Compliant Commercial Solar Quote Includes — Cost in Perth
Before comparing Perth quotes, check each one prices the same kilowatts and the same panel and inverter brands, states how the installer gets panels and people onto the roof, and shows site works, certificates and GST on their own lines.
System size in kW, panel count, panel and inverter make and model, and whether the inverter is single or three phase
The STC assignment shown as a separate line, so the installed price after STCs and the price before it are both visible
A structural engineering report, priced at $800–$2,000, listed as included or excluded
Switchboard upgrade work, at $1,500–$5,000 where needed, shown as its own line
For systems over 30 kW, network upgrade or connection works at $2,000–$10,000 and who lodges the network application
Crane or cherry picker hire at $1,000–$3,000 a day, and any lift, dock or after-hours access charges for towers
Commercial panel cleaning at $5–$15 a panel if a maintenance visit is bundled, priced per visit
Install, site works and any monitoring or maintenance each on its own line, on a single GST basis
The installer's accreditation number and proof of insurance
Commercial solar cost in Perth: transport sheds, tower roofs and the Swan Valley
A Perth small business starts at $8,000–$12,000 for a 10 kW system installed after STCs (typically $10,000), moving to $15,000–$26,000 for 20 kW and $22,000–$33,000 for 30 kW. Transport yards and factories buy 50 kW at $35,000–$55,000 and 100 kW at $70,000–$110,000, which is where the installed cost per watt of $0.70–$1.20 reaches its floor.
The roof sets the rest of a Perth quote. New sheds in Canning Vale and Kewdale have clean metal decks and modern three-phase boards, so the quote stays close to the system price. Towers on St Georges Terrace and in West Perth put panels on tilt frames over concrete, which adds a structural engineering report at $800–$2,000, crane or cherry picker hire at $1,000–$3,000 a day and a dock booking. Fremantle's limestone warehouses and the older shopfronts of Subiaco and Mount Lawley are where a switchboard upgrade at $1,500–$5,000 most often appears.
The Clean Energy Regulator says eligibility for solar PV systems under the Small-scale Renewable Energy Scheme has been expanded from 100 kW to 1 MW for eligible systems installed from 1 October 2026, with a fixed 5-year deeming period for 100 kW to 1 MW systems, and that STC applications for those mid-scale systems will not open until mid to late November 2026. Existing arrangements for systems smaller than 100 kW are not affected. On a Perth quote check the STC line is shown on its own, the installer names who lodges the network application on a system over 30 kW, where $2,000–$10,000 of connection works can apply, and commercial panel cleaning at $5–$15 a panel is priced per visit.
Commercial solar cost by system size in Perth
Quick answerPerth pricing steps by kilowatts: a Leederville cafe or Scarborough shop sits in the $8,000–$12,000 10 kW bracket, a Malaga workshop or Swan Valley cellar door at 20 kW to 30 kW pays $15,000–$26,000 to $22,000–$33,000, and a Kewdale or Canning Vale shed at 50 kW to 100 kW pays $35,000–$55,000 to $70,000–$110,000.
A bigger Perth array buys a lower per-watt price, $0.70–$1.20 across the range with the 100 kW Kewdale and Welshpool sheds at the bottom. Fixed items do not move with size: a structural engineering report at $800–$2,000 is much the same for 20 kW as 50 kW, and a switchboard upgrade at $1,500–$5,000 depends on the board's age, not the array.
Access is the other lever on a Perth job of any size. CBD and West Perth towers need crane or cherry picker hire at $1,000–$3,000 a day plus dock and lift slots; coastal sites at Fremantle, Cottesloe and Scarborough need fixings rated for salt air. Over 30 kW the network upgrade or connection works line at $2,000–$10,000 appears, and commercial panel cleaning at $5–$15 a panel is the running cost at every size.
Frequently Asked Questions — Commercial Solar Cost in Perth
What is the price of commercial solar in Perth?
From our Perth table: $8,000–$12,000 for a 10 kW commercial system (typically $10,000); $22,000–$33,000 for a 30 kW system (typically $27,000); $70,000–$110,000 for a 100 kW system (typically $88,000), all installed after STCs.
How much does a 30 kW commercial solar system cost in Perth?
A 30 kW commercial solar system in Perth costs $22,000–$33,000 installed after STCs, with $27,000 typical. A West Perth tenancy on a tower roof adds a structural engineering report at $800–$2,000 and crane or cherry picker hire at $1,000–$3,000 a day; a Wanneroo packing shed on a metal roof usually needs neither.
What does a 100 kW commercial solar system cost in Perth?
Going by our Perth table, expect $70,000–$110,000 for a 100 kW commercial system installed after STCs; the typical price is $88,000. Kewdale, Welshpool and Canning Vale sheds are the usual Perth buyers, and network upgrade or connection works at $2,000–$10,000 are priced on top because the system is over 30 kW.
What is the installed cost per watt for commercial solar in Perth?
$0.70–$1.20 per watt installed after STCs on our Perth table, with $0.90 typical. The larger the array the lower the figure: a 100 kW system at $70,000–$110,000 sits near the floor, a 10 kW system at $8,000–$12,000 near the top.
Does a Perth business need a switchboard or network upgrade for solar?
Often one or both. A switchboard upgrade for a commercial system costs $1,500–$5,000 and is common in Fremantle's heritage warehouses and the older shopfronts of Subiaco and Mount Lawley. Network upgrade or connection works at $2,000–$10,000 apply to systems over 30 kW, so ask the installer to show the line and name who lodges the network application.
What changed for commercial solar systems over 100 kW?
The Clean Energy Regulator says the Renewable Energy (Electricity) Regulations 2001 have been amended to expand eligibility for solar PV systems under the Small-scale Renewable Energy Scheme from 100 kW to 1 MW, applying to eligible mid-scale systems installed from 1 October 2026, with a fixed 5-year deeming period; STC applications for mid-scale systems will not open until mid to late November 2026. Existing arrangements for systems smaller than 100 kW are not affected.
Does a commercial solar install in Perth need a structural engineering report?
A structural engineering report costs $800–$2,000 on our Perth table, typically $1,200. Owners of CBD and West Perth towers usually ask for one before tilt frames go onto a concrete roof; a single-storey metal unit in Wangara rarely needs it.
What does commercial solar panel cleaning cost in Perth?
Commercial panel cleaning in Perth costs $5–$15 a panel, with $10 a panel typical. Coastal sites at Fremantle and Scarborough, and Swan Valley and Wanneroo growers after the dusty months, book it more often; have the quote price it per visit.
Do Perth commercial solar installers need accreditation?
For mid-scale systems of 100 kW to 1 MW, the Clean Energy Regulator says the system must have its panels, batteries or inverters listed on the Clean Energy Council list of approved components and meet Solar Accreditation Australia install guidelines. Ask for the accreditation number on your Perth quote and check the panel and inverter models against the listed products.