Decision guide
How to compare generator installation quotes
Two standby generator proposals almost never describe the same job. The gap is rarely the generator — it is the gas run, the transfer switch, the panel, the pad, and the permit. This guide is the line-item checklist that makes two numbers comparable.
You are not comparing prices. You are comparing scopes.
When a homeowner tells us one quote came in thousands below another, the difference is usually findable in ten minutes: one proposal priced eighty feet of gas pipe and a service-entrance-rated transfer switch, and the other priced ten feet and a load-managed switch. Both are legitimate jobs. Only one of them is the job you actually need — and the cheaper one is not automatically the wrong one.
The work is to force both proposals onto the same line items. Once the scopes match, the price comparison becomes real. Until they do, the lower number is just a different set of assumptions.
The ten line items a complete proposal contains
Ask for each of these in writing. A contractor who does good work will not object — they are already tracking every one of them internally.
01Equipment: make, model number, and kW rating
A model number is checkable. "22kW standby generator" is not — it does not tell you the engine class, the enclosure, the sound rating, or whether the unit is current production.
AskWhich exact model, and is that the natural-gas or the propane rating?
02The transfer switch: model, amp rating, and whole-home vs. managed-load
This is where two proposals most often diverge without saying so. A service-entrance-rated whole-home switch and a smaller managed-load switch produce very different bills and very different outage experiences.
AskIs this switch whole-home or load-managed, and which circuits does it actually carry?
03Gas piping: length of run, pipe size, and who sizes it
Gas work is one of the largest swing items in a standby install. A quote assuming ten feet of pipe and a quote assuming eighty feet are not the same job, and the shorter assumption is usually the one that was not measured.
AskHow many feet of new gas pipe are in this price, what size, and what happens to the price if the run is longer?
04Meter and service capacity review
A generator adds gas load. Your contractor sizes the piping past the meter; the gas utility owns the service line and meter and reviews capacity for added load. Whether that review has happened is often unstated.
AskHas the gas utility confirmed my service and meter can carry this added load, or is that still open?
05Electrical work: panel condition, breaker changes, grounding
An older or full panel can turn a routine tie-in into a panel upgrade. A proposal that never mentions the panel has usually not looked inside it.
AskDid you open my panel? Is any panel work assumed, excluded, or possible later?
06The pad and site prep
Poured concrete, a pre-cast pad, and a composite pad differ in price and lead time. Sloped lots, retaining, drainage, and access for equipment all sit under this line and are frequently omitted.
AskWhat is the pad, and does this price include grading, drainage, or access work on my lot?
07Permits: which ones, who pulls them, and whether the fee is in the price
Across the metro the electrical permit is issued by different authorities depending on the city, and some cities require more than one permit. "Permits extra" and "permits included" describe the same job at two different prices.
AskWhich permits does this job need, who pulls them, and is the fee inside this number?
08Commissioning, startup, and the first exercise cycle
A generator that was set on a pad and wired is not a commissioned generator. Startup, load test, and the exercise-schedule configuration are what make the warranty and the weekly self-test real.
AskWho performs startup and the load test, and is it in this price or billed separately?
09Warranty: manufacturer term, and the labor warranty separately
These are two different warranties from two different parties. The manufacturer covers parts for a stated term; the installer covers their own labor for a term they choose, which is often much shorter.
AskWhat is the manufacturer warranty term, and separately, how long do you warrant your labor?
10What is explicitly excluded
The exclusions list is the most informative part of any proposal and the part homeowners read last. A proposal with no exclusions section has not been thought through — or has been written to be re-priced later.
AskWhat is excluded from this price, in writing?
Warning signs of an incomplete proposal
None of these means a contractor is dishonest. Every one of them means the number in front of you is not yet a price you can hold anyone to.
- A single total with no line items. You cannot compare it to anything, and neither can the next contractor.
- No model number for either the generator or the transfer switch.
- No mention of permits at all — not "included", not "excluded", not which authority.
- Gas pipe length not stated, or stated as an assumption without a site measurement.
- A price quoted before anyone opened your electrical panel or walked the gas run.
- A discount that expires the same day, or a price that only holds if you sign on the visit.
- A deposit larger than what the equipment order actually requires.
- A promise about permit approval or inspection outcome — no contractor controls either.
- A verbal answer where the proposal is silent. If it changes the price, it belongs in writing.
- A refusal to give you the license number they are pulling the permit under.
Questions to ask a licensed installer
In this order. The first two decide whether the rest of the conversation is even about the right machine.
- What load calculation did you perform, and can I see it?
- Is this sized for whole-home coverage or for a managed set of circuits — and which circuits?
- Which permits does this job require in my city, and who is pulling them?
- What is your license number, and is it current for this work?
- Do you carry liability insurance and workers compensation, and can you send certificates?
- How long is your labor warranty, separately from the manufacturer warranty?
- What is your lead time on the equipment, and what happens if it changes?
- What would make this price go up after you start, and how would you tell me?
- Who performs the startup and load test, and what does maintenance cost after year one?
- Can I have two recent local references for the same model and scope?
What this guide deliberately does not do
No target price, on purpose
We do not publish a “you should pay about X” figure for the Knoxville area. No local dealer publishes a verifiable installed price for a specific unit, and the one widely-quoted range we could find is a national chain template, not a local market quote. Presenting an invented average as a benchmark would give you false confidence in a negotiation — which is worse than no number at all.
What we can do is make sure the two proposals in front of you describe the same scope. That is the comparison that actually protects you.
Nothing here is an electrical, gas, code, permitting, or legal determination. Final sizing, scope, code compliance, fuel capacity, placement, pricing, and permitting all require qualified local review by people who have seen your house.