Stage: Preparing for and comparing quotes See where this sits in the decision

How to compare generator quotes

You have two or three documents that are laid out differently, itemised differently, and priced differently. Ranking them by price is the one comparison that is guaranteed to mislead until the scopes are lined up.

Who this helps: A homeowner with two or three generator proposals laid out differently, itemised differently and priced differently.
When to read it: Read this with the documents open in front of you. It is a working method, not background reading.
What you can decide afterwards: Whether the proposals in hand describe the same project, and if not, what has to be answered before any price comparison means anything.

Quick answer

Normalise scope before looking at price. Work the documents in four passes: mark each scope item as documented, unclear or absent without looking at totals; separate fixed commitments from allowances, assumptions and exclusions; establish whether differences in equipment or coverage are deliberate or just different guesses at what you asked for; and compare what each commits to at completion. Ranking by price before those passes is the most reliable way to pick the wrong proposal.

What this chapter can help you determine

Which proposal is complete, which is missing scope, and exactly what to go back and ask each contractor.

Lining up proposals so the same item can be found in each.
What allowances, assumptions, exclusions, and alternates commit you to.
Comparing proposals that differ in equipment or transfer scope.
What the completion package should contain.

Four passes over the documents, in this order

First pass: is the same scope present in each?

Go item by item and mark each scope as documented, unclear, or absent. Do not look at the totals during this pass.

This points here when:

The proposals are laid out differently.
One document is substantially shorter than another.
Something you discussed is not written down anywhere.

If this is the wrong call: Comparing prices across documents that describe different projects, which is the single most common way households pick the wrong proposal.

Second pass: what is conditional?

Separate fixed commitments from allowances, assumptions, exclusions, and alternates. Each of these can move the final figure after signing.

This points here when:

A line item carries an allowance rather than a price.
A proposal assumes something about the property nobody verified.
An item is listed as by others or by owner.

If this is the wrong call: Treating a conditional total as a fixed price, and meeting the difference as a change order at the least convenient moment.

Third pass: are the differences deliberate?

Where proposals differ in equipment, coverage scope, or transfer arrangement, establish whether the difference reflects a different professional judgement or simply a different assumption about what you asked for.

This points here when:

Capacities or models differ between proposals.
One includes load management and another does not.
Transfer equipment differs in type or scope.

If this is the wrong call: Assuming the larger or more expensive specification is the more careful one, when it may only reflect a different guess at what you wanted.

Fourth pass: what happens after the work is done?

Compare what each proposal commits to at completion: start-up, handover, documentation, warranty registration, restoration, and any maintenance arrangement.

This points here when:

Maintenance is offered as part of the proposal.
Warranty terms are described in the proposal rather than the manufacturer's document.
Restoration of the site is mentioned only in passing.

If this is the wrong call: A completed installation with no documentation, unregistered warranty, and no agreed handover — problems that are difficult to correct later.

What you probably already know

What you asked each contractor for.
Which contractor you found easiest to deal with.
The headline price on each document.
Roughly what equipment each proposes.

What is commonly still unknown at this point

Which items are excluded, since exclusions are often stated once in small print.
What each allowance covers and what happens when it is exceeded.
Whether the warranty described is the manufacturer's or the contractor's, and what each covers.
Who is responsible for permits, inspections, and utility coordination in each document.
What the payment schedule ties to, and what triggers each stage.

Information to gather

Every proposal in writing. A verbal price is not a proposal and cannot be compared.
The exclusions section of each document, in full.
The manufacturer's own warranty document for the equipment proposed, obtained from the manufacturer.
Written answers to the gaps found in the first pass, from the contractor who left them.
What the payment schedule ties each stage to.

Questions to ask

What is excluded from this proposal that a complete project would require?
Which line items are allowances, and what happens if the actual cost exceeds them?
Which assumptions about this property does this proposal rest on, and who verified them?
How are change orders priced and approved once work has started?
What documentation will I have at completion, and who registers the warranty?
Who performs start-up, and what handover will the household receive?

When this does not apply

Only one proposal is in hand, so there is nothing to compare.
The proposals are verbal — a verbal price cannot be compared.
The question is whether to repair existing equipment rather than install new.

What would change the decision

An exclusion surfaces that changes what a proposal actually covers.
A contractor's written answer reveals an assumption nobody verified.
An allowance turns out to carry material risk.
The manufacturer's own warranty document differs from what a proposal described.

The scope checklist, item by item

Work down this list with each document open, marking every item documented, unclear, or absent. It is the same checklist the quote decoder runs on — the tool records your marks and returns the questions; this is the list itself, if you would rather work on paper.

Every scope item a complete generator proposal addresses.
Scope	Item	Ask if it is unclear or absent
Equipment	Proposed equipment, named	Which exact model is proposed, and why that one for this property?
Equipment	Equipment rating stated	What rating is proposed, and what determination was it based on?
Equipment	Transfer equipment specified	What transfer equipment is included, and what does it cover?
Equipment	Load-management components	Does this include load-management equipment, and which loads would it shed?
Electrical	Electrical scope described	What electrical work is included, and what is assumed about the existing service?
Electrical	Panel or service work	Is any panel or service work included, and what happens if it turns out to be needed?
Fuel	Fuel scope described	What fuel work is included, and who determined the supply is adequate?
Fuel	Fuel-supply adequacy assessed	Has a qualified fuel professional assessed the supply, and is that assessment written down?
Permits and utility	Permits — who obtains them	Who obtains the permits, and is the cost inside this price?
Permits and utility	Inspections — who arranges them	Who arranges inspections, and who attends them?
Permits and utility	Utility coordination	Which utility steps are required, who requests them, and how long do they take?
Site	Site work and access	What site work is included, and how will equipment reach the location?
Site	Pad or mounting surface	What is the equipment mounted on, and is that surface in this price?
Completion	Start-up and commissioning	Who performs start-up, and is it included here?
Completion	Owner handover or training	What will the household be shown at handover, and by whom?
Completion	Site restoration	What restoration is committed to, and what is explicitly excluded?
Completion	Warranty terms stated	Which warranty is described here — the manufacturer's or yours — and who registers it?
Completion	Maintenance arrangement	Is maintenance part of this proposal, and what does it commit each side to?
Commercial terms	Exclusions listed	What is excluded from this proposal that a complete project would need?
Commercial terms	Allowances identified	Which items are allowances, and what happens if the actual cost exceeds them?
Commercial terms	Payment schedule	What does each payment stage tie to?
Commercial terms	Change-order treatment	How are change orders priced and approved once work has started?
Commercial terms	Completion documentation	What documents will I hold when the work is finished?

What requires a qualified professional

The comparison is yours to make; the determinations inside each proposal are the contractor's. This handbook does not evaluate contractors, rank them, or assess whether a proposal is technically correct.
If two proposals disagree about what this property requires, that disagreement is resolved by a qualified professional inspecting the property, not by choosing the more convenient answer.

What this page cannot determine

Which contractor to hire.
Whether a price is reasonable for this market.
Whether a proposal's technical approach is correct.

Deliberately out of scope here:

Choosing a contractor, which this handbook does not do.
Judging whether a price is fair.
Any assessment of a named company.

Bottom line

The cheapest proposal and the most complete proposal are frequently not the same document, and you cannot tell which is which until the scopes line up. Completeness is yours to assess; technical correctness remains a professional judgement.

What to do next

Do this chapter's work on paper: Generator quote decoder. Record, item by item, what each proposal documents — and generate the questions for whatever it does not.

The next decision is Permits, inspections, and who approves a generator installation — Which approval tracks your project touches, who owns each one, and exactly what to confirm with your local authority — none of which can be answered generically, and all of which can be asked precisely.

What drives the cost of a standby generator project? — Which scopes this particular project contains, so that a price difference between two proposals can be traced to a scope difference rather than guessed at.
Whole-home backup or essential loads only? — How much of the house this household is buying coverage for, stated precisely enough that two proposals can be compared.
Warranty repair or out of pocket: finding out which — Who determines whether this repair is covered, and what to establish before authorising any work that might not be.
How to choose a generator installer — Which companies survive the checks you can actually perform, and what has to be in writing before the remaining choice is safe to make.

What published cost figures actually say — If you want published figures to hold a proposal against, they are there with their sources and dates.

describe the project once to a local professional — Once the passes above have settled which proposal is complete, the remaining work is describing the project accurately rather than repeating it to each company in turn.

what you can actually verify about an installer — A complete proposal and a company you can check are different questions, and the second one is the harder of the two.

Stage: Preparing for and comparing quotes See where this sits in the decision

How to compare generator quotes

Who this helps: A homeowner with two or three generator proposals laid out differently, itemised differently and priced differently.
When to read it: Read this with the documents open in front of you. It is a working method, not background reading.
What you can decide afterwards: Whether the proposals in hand describe the same project, and if not, what has to be answered before any price comparison means anything.

Quick answer

What this chapter can help you determine

Which proposal is complete, which is missing scope, and exactly what to go back and ask each contractor.

Lining up proposals so the same item can be found in each.
What allowances, assumptions, exclusions, and alternates commit you to.
Comparing proposals that differ in equipment or transfer scope.
What the completion package should contain.

Four passes over the documents, in this order

First pass: is the same scope present in each?

Go item by item and mark each scope as documented, unclear, or absent. Do not look at the totals during this pass.

This points here when:

The proposals are laid out differently.
One document is substantially shorter than another.
Something you discussed is not written down anywhere.

If this is the wrong call: Comparing prices across documents that describe different projects, which is the single most common way households pick the wrong proposal.

Second pass: what is conditional?

Separate fixed commitments from allowances, assumptions, exclusions, and alternates. Each of these can move the final figure after signing.

This points here when:

A line item carries an allowance rather than a price.
A proposal assumes something about the property nobody verified.
An item is listed as by others or by owner.

If this is the wrong call: Treating a conditional total as a fixed price, and meeting the difference as a change order at the least convenient moment.

Third pass: are the differences deliberate?

This points here when:

Capacities or models differ between proposals.
One includes load management and another does not.
Transfer equipment differs in type or scope.

If this is the wrong call: Assuming the larger or more expensive specification is the more careful one, when it may only reflect a different guess at what you wanted.

Fourth pass: what happens after the work is done?

Compare what each proposal commits to at completion: start-up, handover, documentation, warranty registration, restoration, and any maintenance arrangement.

This points here when:

Maintenance is offered as part of the proposal.
Warranty terms are described in the proposal rather than the manufacturer's document.
Restoration of the site is mentioned only in passing.

If this is the wrong call: A completed installation with no documentation, unregistered warranty, and no agreed handover — problems that are difficult to correct later.

What you probably already know

What you asked each contractor for.
Which contractor you found easiest to deal with.
The headline price on each document.
Roughly what equipment each proposes.

What is commonly still unknown at this point

Which items are excluded, since exclusions are often stated once in small print.
What each allowance covers and what happens when it is exceeded.
Whether the warranty described is the manufacturer's or the contractor's, and what each covers.
Who is responsible for permits, inspections, and utility coordination in each document.
What the payment schedule ties to, and what triggers each stage.

Information to gather

Every proposal in writing. A verbal price is not a proposal and cannot be compared.
The exclusions section of each document, in full.
The manufacturer's own warranty document for the equipment proposed, obtained from the manufacturer.
Written answers to the gaps found in the first pass, from the contractor who left them.
What the payment schedule ties each stage to.

Questions to ask

What is excluded from this proposal that a complete project would require?
Which line items are allowances, and what happens if the actual cost exceeds them?
Which assumptions about this property does this proposal rest on, and who verified them?
How are change orders priced and approved once work has started?
What documentation will I have at completion, and who registers the warranty?
Who performs start-up, and what handover will the household receive?

When this does not apply

Only one proposal is in hand, so there is nothing to compare.
The proposals are verbal — a verbal price cannot be compared.
The question is whether to repair existing equipment rather than install new.

What would change the decision

An exclusion surfaces that changes what a proposal actually covers.
A contractor's written answer reveals an assumption nobody verified.
An allowance turns out to carry material risk.
The manufacturer's own warranty document differs from what a proposal described.

The scope checklist, item by item

Every scope item a complete generator proposal addresses.
Scope	Item	Ask if it is unclear or absent
Equipment	Proposed equipment, named	Which exact model is proposed, and why that one for this property?
Equipment	Equipment rating stated	What rating is proposed, and what determination was it based on?
Equipment	Transfer equipment specified	What transfer equipment is included, and what does it cover?
Equipment	Load-management components	Does this include load-management equipment, and which loads would it shed?
Electrical	Electrical scope described	What electrical work is included, and what is assumed about the existing service?
Electrical	Panel or service work	Is any panel or service work included, and what happens if it turns out to be needed?
Fuel	Fuel scope described	What fuel work is included, and who determined the supply is adequate?
Fuel	Fuel-supply adequacy assessed	Has a qualified fuel professional assessed the supply, and is that assessment written down?
Permits and utility	Permits — who obtains them	Who obtains the permits, and is the cost inside this price?
Permits and utility	Inspections — who arranges them	Who arranges inspections, and who attends them?
Permits and utility	Utility coordination	Which utility steps are required, who requests them, and how long do they take?
Site	Site work and access	What site work is included, and how will equipment reach the location?
Site	Pad or mounting surface	What is the equipment mounted on, and is that surface in this price?
Completion	Start-up and commissioning	Who performs start-up, and is it included here?
Completion	Owner handover or training	What will the household be shown at handover, and by whom?
Completion	Site restoration	What restoration is committed to, and what is explicitly excluded?
Completion	Warranty terms stated	Which warranty is described here — the manufacturer's or yours — and who registers it?
Completion	Maintenance arrangement	Is maintenance part of this proposal, and what does it commit each side to?
Commercial terms	Exclusions listed	What is excluded from this proposal that a complete project would need?
Commercial terms	Allowances identified	Which items are allowances, and what happens if the actual cost exceeds them?
Commercial terms	Payment schedule	What does each payment stage tie to?
Commercial terms	Change-order treatment	How are change orders priced and approved once work has started?
Commercial terms	Completion documentation	What documents will I hold when the work is finished?

What requires a qualified professional

The comparison is yours to make; the determinations inside each proposal are the contractor's. This handbook does not evaluate contractors, rank them, or assess whether a proposal is technically correct.
If two proposals disagree about what this property requires, that disagreement is resolved by a qualified professional inspecting the property, not by choosing the more convenient answer.

What this page cannot determine

Which contractor to hire.
Whether a price is reasonable for this market.
Whether a proposal's technical approach is correct.

Deliberately out of scope here:

Choosing a contractor, which this handbook does not do.
Judging whether a price is fair.
Any assessment of a named company.

Bottom line

What to do next

Do this chapter's work on paper: Generator quote decoder. Record, item by item, what each proposal documents — and generate the questions for whatever it does not.

What drives the cost of a standby generator project? — Which scopes this particular project contains, so that a price difference between two proposals can be traced to a scope difference rather than guessed at.
Whole-home backup or essential loads only? — How much of the house this household is buying coverage for, stated precisely enough that two proposals can be compared.
Warranty repair or out of pocket: finding out which — Who determines whether this repair is covered, and what to establish before authorising any work that might not be.
How to choose a generator installer — Which companies survive the checks you can actually perform, and what has to be in writing before the remaining choice is safe to make.

What published cost figures actually say — If you want published figures to hold a proposal against, they are there with their sources and dates.

what you can actually verify about an installer — A complete proposal and a company you can check are different questions, and the second one is the harder of the two.