Free comparison tool

Compare whole-house generator installation quotes.

Put two or three written proposals on the same declared scope. Record what each bidder documents, flag mismatched assumptions, and print the questions that still need answers.

Private bid workspace

Compare the written scope—not only the total.

Mark what each proposal includes. Entries remain in this browser tab and are not added to the URL or sent with analytics events.

Number of quotes

Wide tables scroll horizontally. On phones, each scope line becomes a labeled card with every quote visible.

Whole house generator quote scope comparison. Record what each written proposal says; “Not documented” never means “Excluded.”
Comparison sequenceMatch the core project first.Then complete 10 written-scope lines below.

Do not compare totals until rated kW, fuel, transfer operation, and coverage describe the same job.

Quote A
Quote B
01Generator equipmentModel, rated kW, fuel-specific rating, delivery, and listed accessories
02Transfer switch & load controlOperation, amperage, service scope, load-management modules, and integration
03Electrical workConductors, conduit, grounding, bonding, feeder route, panel tie-in, and labeling
04Fuel connectionPipe or tank work, route length, trenching, regulators, pressure testing, and utility coordination
05Placement & site preparationApproved location, pad, drainage, anchoring, access, excavation, and restoration
06Permits & inspectionsElectrical, fuel, building, zoning, fire, utility, HOA, and inspection responsibility
07Panel or service workKnown panel corrections, service changes, disconnects, surge protection, and deferred work
08Startup & commissioningStartup, simulated outage, load test, monitoring setup, documentation, and owner orientation
09Warranty & serviceEquipment registration, labor coverage, exclusions, maintenance, and local service responsibility
10Schedule, changes & exclusionsStart and completion window, payment schedule, taxes, change orders, cleanup, and written exclusions
Comparison brief

Complete the core scope for every quote.

Matching entries do not validate pricing, contractor qualifications, code compliance, or omitted scope. Resolve the written questions before using totals to choose between bids.

Core scope differences
Incomplete
Scope lines needing attention
0
Individual follow-up questions
0
Entered total spread
Add 2 totals
Quote A0 included0 need attention10 unchecked
Quote B0 included0 need attention10 unchecked
Questions to resolve

No differences marked yet.

Work across the table one row at a time. Any core mismatch, allowance, condition, unclear field, missing document detail, or exclusion creates a bidder question here.

Generator Budget quote-comparison worksheet · Version 2026.08 · Reviewed 2026-08-18. Planning comparison only; no independent professional review, contractor approval, design review, or code-compliance determination.

A written total is useful only after the scope is visible.

The comparison follows the proposal as written. It never fills a missing line with a national allowance, adjusts a contractor's price, scores workmanship, or declares a winning bidder.

STEP 1

Match the core project first.

Record rated generator kW, fuel, transfer operation, and coverage plan. An 18 kW managed-load proposal and a 22 kW whole-home proposal are different projects even if both pages say “complete installation.” Resolve that difference before reading the price spread.

STEP 2

Read each installation line literally.

Mark a line Included only when the written quote clearly places it inside the stated total. Use Allowance, Conditional, Unclear, Not documented, or Excluded when the document says something else. A missing line is a question—not permission to assume the contractor included it.

STEP 3

Compare responsibilities as well as materials.

Fuel work, permits, trench restoration, utility coordination, panel corrections, warranty registration, and commissioning can be performed by different parties. Ask who owns each task, which fee is included, and what finding would trigger a written change order.

STEP 4

Verify outside the proposal.

A checked line proves only that text appears in the proposal. It does not verify licensure, insurance, workmanship, equipment equivalence, code compliance, fuel capacity, clearance, or warranty enforceability. Use current official records and qualified local professionals for those decisions.

Stop before a price-only decision.

  • The generator size, fuel, transfer method, or supported loads differ.
  • A proposal uses allowances without stating what happens above them.
  • Permits, inspections, panel work, fuel capacity, or restoration are not documented.
  • The written payment schedule, change-order process, warranty, or exclusions are incomplete.
  • A seller pressures you to sign immediately or will not provide verifiable business and credential details.

Sources and evidence boundaries.

Consumer guidance supports written estimates and careful comparison. Generator and safety sources identify installation topics that may need to appear in a proposal. None of these sources approves a contractor, supplies a universal contract, or validates the project design.

Prepared and maintained by Generator Budget. Version 2026.08; reviewed 2026-08-18. This page has not received independent professional review. Send corrections through the Contact page.

Federal Trade Commission

How To Avoid a Home Improvement Scam

Get multiple written estimates, compare scope and materials instead of automatically choosing the lowest bidder, verify licensing and insurance where applicable, and use a written contract.

General U.S. consumer guidance. Contract, licensing, cancellation, payment, and permit rules still vary by state and locality.Open source
Generac

Backup Generator Installation

A standby-generator proposal may need to address placement, site preparation, fuel connection, transfer equipment, permits, commissioning, and project timing.

Manufacturer process context, not an independent price benchmark or a complete contract standard for every brand and jurisdiction.Open source
U.S. Consumer Product Safety Commission staff

Report on the Carbon Monoxide Hazard Associated with Stationary Generators

Stationary-generator work commonly involves licensed trades, manufacturer instructions, local codes, permits, and inspection of electrical and fuel connections where required by the authority having jurisdiction.

CPSC staff report that was not reviewed or approved by the Commission. Safety and regulatory context only; it does not create a national clearance rule, universal bid format, permit list, or project price.Open source

Generator quote comparison questions.

These answers describe the tool's limits as carefully as its use.

How many generator installation quotes should I compare?

The tool accepts two or three written proposals. The FTC recommends getting multiple estimates, and some state consumer agencies specifically suggest three, but the useful test is whether the proposals describe the same work, materials, timing, and price clearly enough to compare.

Should I choose the lowest whole house generator quote?

Not automatically. A lower total may reflect a different generator size, coverage plan, transfer switch, fuel route, permit responsibility, warranty, or exclusion. Resolve those differences and verify contractor credentials before treating the totals as comparable.

Does a missing line mean the contractor excluded it?

No. Missing text means the written proposal does not document that scope. Mark it as Not documented and ask the bidder to confirm whether it is included, separately priced, conditional, excluded, or handled by someone else.

Can Generator Budget verify a contractor license or insurance?

No. Ask for current proof and verify the applicable license or registration with the relevant state, county, or local authority. Requirements and official lookup systems vary by jurisdiction.

Does this tool approve generator placement, electrical work, or code compliance?

No. It only compares what written proposals say. The exact model instructions, qualified electrical and fuel professionals, the authority having jurisdiction, permit reviewers, and site inspection determine the final design, placement, clearances, connections, and approvals.

Need a planning baseline before the bids arrive?

Use the sizing, component, and installed-cost tools to define the intended scope. Contractor proposals still control their own written prices and terms.