How much does a generator cost installed in 2026?
Per-kVA rates by region, common system prices, what drives the cost, and how to write a generator quote that wins.
The short answer
Generator installers typically charge $80 to $160 per hour
$800 to $35,000+ per system depending on capacity. Here is what tradies actually charge in 2026 and how the price gets built.
Generator installers typically quote per system. A small portable generator (3-6kVA) supplied without installation runs $800 to $2,500. A standby 7-12kVA generator with auto-changeover runs $4,500 to $12,000 installed. Commercial 20-40kVA standby with weather enclosure runs $15,000 to $25,000. Larger 50-100kVA+ commercial systems with fuel tanks run $25,000 to $35,000+. Pricing depends on generator type (petrol, diesel, gas), capacity, automatic vs manual transfer switch, weather enclosure, fuel storage, and electrical integration.
Hourly rates
Generator installers hourly rates by region (2026)
Standard daytime rates across the major markets. Metro areas typically command a 20-30% premium. After-hours work is 1.5x to 2x.
United States
Notes
Licensed generator contractors with electrical at the top
United Kingdom
Notes
Standard residential generators less common
Australia
Notes
Licensed electricians with generator endorsement at the top
South Africa
Notes
Wireman's licence holders with diesel certification above this
Canada
Notes
Toronto, Vancouver at the top
New Zealand
Notes
Auckland and Wellington at the top
Ireland
Notes
Dublin commands a premium
India
Notes
Mumbai, Delhi, Bangalore at the top
Job pricing
Common generator installer jobs and what they cost
Real-world price ranges for the jobs tradies quote every week. Includes labour, parts, and standard call-out.
Site assessment and load profile
What's included
Most installers quote free for paid jobs. Detailed load assessment may be charged for larger installs.
Portable generator supply only (3-6kVA)
What's included
Includes generator, manual fuel filling. Customer self-installs. Suits short outages only.
Portable + manual transfer switch (5-8kVA)
What's included
Includes generator, manual transfer switch (changeover plug), basic electrical integration. 1-2 hour install.
Standby 7-12kVA with auto-changeover
What's included
Includes generator, auto-transfer switch, exterior pad, full electrical integration. Auto-start on power loss.
Commercial 20-40kVA standby
What's included
Includes generator, weather enclosure, ATS, fuel tank, compliance signage. 2-3 day install.
Larger 50-100kVA commercial
What's included
Includes industrial generator, larger fuel storage, advanced ATS, monitoring. Multi-day install.
Weather enclosure / sound attenuation
What's included
Reduces noise to <65dB at 7m. Required for residential and most commercial installs.
Diesel fuel tank (500-1000L)
What's included
External tank, leak detection, fill port. Required for diesel generators wanting longer run time.
Annual service
What's included
Includes oil change, filter replacement, electrical test, transfer switch test. Critical for reliability.
What drives the price
Six things that change the price of a job
The same job can cost 2x more or less depending on these factors. Knowing them helps customers spot fair quotes and helps tradies justify their own.
Generator type and capacity
Petrol 3-6kVA: cheapest, short run time, residential portable. Diesel 7-12kVA: reliable, longer run time, standby. Diesel 20kVA+: commercial. Gas (natural gas/LPG): cleanest, no refuelling. State type and capacity.
Auto vs manual changeover
Manual: human flips a switch when power fails. Auto: generator starts and switches automatically. Auto adds $1,500-4,500 but eliminates customer involvement. Quote both options.
Weather enclosure
Residential and most commercial installs require sound attenuation. Standard enclosure $2,800-5,500. Premium ultra-quiet for residential areas $5,500-8,500.
Fuel storage
Standard tank in generator base: 4-8 hours run time. External tank (500-1000L): 24-48 hours run time. State the assumed run time on the quote.
Electrical integration
Transfer switch installation, change-over wiring, breaker integration. Standard single-phase residential is $1,500-3,500. 3-phase commercial costs more.
Compliance and emissions
Most regions have emission standards (Tier 4 in US, Stage V in EU). Older or non-compliant generators may not pass council approval. State compliance level.
How to quote it
How generator installers should price their work
Tips for tradies on writing quotes that win the job and protect the margin.
Quote generator brand and capacity
'Generac Guardian 12kW with auto-transfer switch' beats 'standby generator'. Customers verify specs at quote time.
Show load list with run time
'Covers essentials (8 LED lights, 1 fridge, 1 TV, Wi-Fi, 2 fans) for 8 hours per tank' beats 'lots of stuff'. Customers understand sizing decisions.
Itemise weather enclosure
Most residential customers don't realise enclosure is mandatory. Quoting it separately makes the cost clear and avoids 'why is the standby option so much more' confusion.
Take a 30% deposit
Generators are ordered specifically. 30% covers the unit. Balance on commissioning. Standby installs may need 50% deposit for larger units.
Offer annual service plan
$280-850 annual service. Generators that aren't serviced fail at year 3-5. Quote at install; conversion 60-80%. Recurring revenue you can plan around.
Send commissioning + test results via WhatsApp
Photo of unit install, ATS test result, customer training notes. Customer trusts the system; warranty claims documented.
Watch out for
Pricing red flags to watch for
The patterns that usually signal a problem on the quote, with what to do about each one.
No electrical compliance
What to do: Walk away. Generators with electrical changeover need CoC in most regions. Without it, the install voids home insurance for fire incidents.
Cash-only with no invoice
What to do: Walk away. Without an invoice you have no warranty, no insurance claim path, no annual service history for next buyer.
Verbal quote on a $3,000+ install
What to do: Always written. Generators have too many variables (capacity, fuel type, ATS, enclosure, fuel tank) for verbal.
Promises 'will power everything'
What to do: Walk away. 5kVA cannot power a heat pump + electric oven + aircon at once. Insist on load assessment showing what each circuit pulls and what the generator can handle.
No insurance certificate
What to do: Generator work involves fuel storage and electrical work; both high-risk. Ask for public liability; without it, fire or fuel-leak incidents are your liability.
Pressure to skip the service plan
What to do: Generators are not 'install and forget'. Without annual servicing, fuel injectors clog, batteries die, starting components corrode. The 'cheap' install becomes expensive in 3-5 years.
Sample quote
A real example: line-by-line
Standby diesel generator, 12kVA, auto-changeover, residential 3-bed
Generac Guardian 12kW diesel standby generator (5-year warranty)
Acoustic weather enclosure (residential <65dB at 7m)
Auto-transfer switch (200A) with breaker panel integration
Concrete pad (1.5x2m, reinforced) + drainage
Diesel sub-base tank (12-hour run time, level monitoring)
Electrical integration: ATS wiring, change-over panel, breaker panel
Installation labour (2-3 days, 2-person team)
Commissioning, ATS test, customer training, Certificate of Compliance
FAQ
Generator installers pricing questions, answered
Everything customers and tradies ask about generator installer pricing.
Portable 3-6kVA: $800-2,500 supply only. 7-12kVA standby with auto-changeover: $4,500-12,000. 20-40kVA commercial: $15,000-25,000. 50-100kVA+ industrial: $25,000-35,000+. Most expensive in US/AU; cheapest in UK due to less demand.
Portable: cheaper, but requires you to roll it out and start it during outage. Standby: more expensive, but starts automatically when power fails. For frequent outages (SA market) or commercial use, standby is the standard. For occasional rural use, portable suffices.
Add up peak loads: lights ($50W each), fridge (~400W), Wi-Fi (~50W), TV (~150W), Fans (~80W each), Aircon (~1500W per zone). 5-7kVA covers essentials. 10-12kVA covers most home use except aircon. 16-20kVA covers whole-home.
Petrol: cheapest unit, short run time, residential portable. Diesel: reliable, longer run time, easier to source fuel, standby workhorse. Gas (natural/LPG): cleanest, no refuelling, premium. Most standby installs are diesel.
Yes, 2-3 quotes for installs over $3,000. Compare generator brand, capacity, fuel type, ATS inclusion, enclosure spec, and warranty. Cheapest often skips weather enclosure (legally required) or uses budget brands.
Yes for residential and most commercial installs. Limits noise to <65dB at 7m (residential limit in most areas). Adds $2,800-8,500 but is legally required and prevents neighbor complaints.
30% deposit on signing (generator order), 50% on equipment delivered, 20% on commissioning. Larger systems (20kVA+) may need 50% deposit. Anyone asking for full payment upfront is a risk.
Residential 12kVA with concrete pad: 2-3 days. Commercial 20-40kVA: 3-5 days. Larger systems with fuel tanks: 5-10 days. Electrical work for ATS integration is the time-consuming part.
Annually minimum, twice per year for heavy-use sites. Service includes oil change, filter replacement, electrical test, transfer switch test, battery check. $280-850/year. Skipping service leads to fuel injector failure and dead batteries when you need the gen.
Get the generator brand and model, capacity, fuel type, ATS inclusion, enclosure type, fuel tank size, and warranty upfront in writing. Pay via banking app. Verbal cash deals are how 'cheap' generators become $25,000 worth of useless metal in your driveway when you need them most.
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