Generator Transfer Switch Quote Checklist

The homeowner asks for a whole-house generator because the last outage spoiled a freezer and shut down the well pump. The first quote says only:

Install 22 kW standby generator and 200-amp automatic transfer switch — complete.

That line leaves every expensive decision open. It does not say which loads the generator is expected to carry, whether load management is part of the design, whether the existing service equipment is suitable, or where the generator and fuel piping will go. It also leaves out the permit, utility outage, solar or battery interaction, and what “complete” means after startup.

The equipment may be right. The quote is not ready.

For a small electrical shop, a good quote keeps the job aligned from the site visit through design, permits, installation, testing, and customer training. Start in the electrical forms catalog.

Use the site assessment checklist to record the existing condition and the electrical quote to price the selected system. If the customer needs options, use the electrical proposal. Once the customer approves the job, carry that scope into the electrical work order for the crew.

Before the customer signs, the quote should answer eight questions:

• What kind of standby-power system are you proposing?
• Which loads need to run during an outage, and which may be shed or left off?
• What generator, transfer equipment, controls, distribution equipment, and accessories are included?
• What existing service, panel, grounding, bonding, fuel, and site conditions does the price assume?
• Who handles the design, permits, utility, fuel, civil, and inspection work?
• What shutdowns, access, trenching, patching, and restoration are included?
• How will the system be started, transferred, tested, labeled, and handed over?
• Which discoveries or customer changes require a revised price?

Classify the job before naming the equipment

“Emergency generator” is common customer language. It is not enough to classify the electrical system.

NFPA 70 does not treat every generator job alike. The 2026 National Electrical Code uses Article 445 for generators, Article 700 for emergency systems, Article 701 for legally required standby systems, and Article 702 for optional standby systems. The locally adopted edition and amendments, the occupancy and loads served, and decisions by the authority having jurisdiction (AHJ) determine which requirements apply.

A typical home system serving refrigeration, a well pump, selected HVAC, lighting, and receptacles for convenience may be an optional standby system. A system serving legally required egress lighting, fire protection, healthcare functions, or another mandated load can follow a different path. Do not let a customer’s use of the word “critical” decide the code classification.

Put the design basis in the quote:

If the classification is unresolved, quote a paid assessment or design step before offering a fixed installation price. That is more honest than pricing an optional residential package and discovering during review that the building has required standby loads, fire-alarm interfaces, elevators, healthcare equipment, or other conditions outside that package.

Build a generator load schedule, not a wish list

“Whole house” can mean three different things:

1. The transfer equipment is connected at the service, but the generator cannot carry every load at once.
2. The generator is sized for the calculated load expected to operate together.
3. The customer assumes every appliance, motor, heater, charger, and future load can run without restriction.

The quote has to say which meaning applies.

Use the site assessment to list each load the customer wants available during an outage:

Do not turn this into a homeowner wattage worksheet and call it a load calculation. Record the customer’s operating priorities, verify nameplates and existing distribution, and use the calculation method required for the actual design and adopted code.

The EV charger quote-intake guide shows why existing and future loads matter. A service that looks quiet in a panel photo may already support a heat pump, electric water heater, range, dryer, pool equipment, charger, solar inverter, or battery system. Generator work adds another source and another operating mode; it does not erase those interactions.

A clean load promise might say:

Proposed system is designed to supply the circuits listed in Schedule A during a utility outage. Central air-conditioning condenser 2, electric range, clothes dryer, EV charger, pool heater, shop welder, and future loads are excluded from simultaneous generator operation unless later added through an approved design revision. Automatic load-management controls are included only for the equipment identified in Schedule B. Customer must not add or reassign circuits served by the generator without qualified review.

That is clearer than “whole house.”

Name the transfer arrangement in plain English

The transfer switch is not a generic accessory. It defines how the normal and alternate sources connect to the load.

DOE’s standby-generator guidance describes an automatic transfer switch as the equipment that transfers a load between the utility and backup source without backfeeding the utility. FEMA P-1019 likewise treats transfer equipment, distribution, controls, generator capacity, fuel, maintenance, and the loads being served as one system.

The quote should identify at least:

• manual or automatic operation;
• transfer-equipment manufacturer, model, rating, poles, enclosure, and listing basis after selection;
• service-level, feeder-level, or selected-load arrangement;
• circuits or distribution equipment served;
• service disconnect and overcurrent-protection changes;
• whether the neutral treatment and grounding/bonding design are shown on the approved one-line;
• load-management modules, priorities, and controlled equipment;
• generator start, exercise, monitoring, and shutdown controls included;
• interaction with solar, batteries, EV equipment, or another source;
• required signage, directories, labels, and emergency shutdown identification; and
• manufacturer accessories, cold-weather kits, surge protection, remote annunciation, or monitoring included in the price.

Do not let the model name stand in for the generator rating. Record the output, voltage, phase, frequency, fuel, and any manufacturer derating used in the design. If the same model has different output on natural gas and propane, the quote should show the rating for the fuel actually proposed.

UL identifies both automatic and nonautomatic transfer switches under UL 1008, including equipment for optional standby systems. The quoting lesson is simple: name the actual listed equipment and application after design. Do not write “ATS included” while leaving the product category, rating, enclosure, and system arrangement undecided.

If the customer is choosing between systems, present comparable options:

These are proposal categories, not universal designs. The qualified designer, manufacturer instructions, listing, AHJ, utility, and site conditions decide what is acceptable.

Survey the service, panel, and every other power source

Panel photos are a useful intake. They are not a final generator survey.

The electrical inspection report should record existing conditions that affect the quote:

• service rating, voltage, phase, and service-equipment arrangement;
• meter and utility access;
• main and downstream distribution equipment identity;
• available spaces and physical condition;
• conductor and raceway paths that can be observed;
• grounding and bonding arrangement to be verified in design;
• existing surge protection and disconnects;
• labeling and directory condition;
• solar, storage, EV, or other generation equipment;
• well, septic, HVAC, refrigeration, medical, or business-process loads the owner expects to run;
• signs of water, corrosion, overheating, damage, unlisted modifications, or unsafe access; and
• equipment or conditions that need correction before generator work.

Do not bury a deteriorated service enclosure, obsolete panel, blocked working space, damaged grounding connection, or undocumented solar interconnection inside the generator price. Record the finding, decide whether correction is prerequisite or included scope, and price it separately.

When the site differs from the estimate assumption, use the stop-and-price method in Hidden Conditions and Scope Gaps. Do not absorb an unquoted service rebuild just because you are already installing the generator.

Quote the generator site and fuel path as real work

The generator location controls more than feeder length.

The site record should show:

• proposed generator and transfer-equipment locations;
• property lines, building openings, air intakes, vents, doors, windows, and occupied areas;
• flood, drainage, snow, wind, wildfire, salt-air, and vehicle-exposure conditions relevant to the site;
• pad, anchorage, elevation, bollards, fencing, screening, and access;
• exhaust direction and manufacturer-required service clearances;
• fuel type, source, meter or tank location, route, capacity review, regulator work, and the contractor responsible for the fuel work;
• electrical raceway route, trench, sleeves, penetrations, firestopping, and restoration;
• landscaping, irrigation, paving, concrete, wall, ceiling, and finish work affected;
• noise or local zoning review assigned to a named party; and
• delivery, lifting, crane, gate, alley, rooftop, or narrow-access conditions.

CPSC warns that generator exhaust can create deadly carbon monoxide exposure and says portable generators belong outdoors, well away from doors, windows, vents, and other openings. That warning is for portable units. For a permanently installed generator, quote the manufacturer’s listed clearances and the AHJ’s placement, exhaust, fuel, and site requirements instead of turning portable-generator advice into a setback rule.

Miami-Dade County’s public generator-permit guide shows how detailed a local review can become. For its jurisdiction, the submittal can require a site plan, generator and transfer-switch locations, connected load, conduit and conductor sizes, overcurrent protection, switching, a one-line diagram, grounding information, exhaust separation, fuel details, pad design, anchorage, and zoning setbacks. Another AHJ may ask for a different package.

Write the local condition, not a national promise:

Price includes electrical permit application and one standard electrical inspection for the system shown. Building, zoning, structural, fuel-gas, fire, environmental, noise, floodplain, HOA, and utility approvals are included only where specifically listed. Generator location and routing remain conditional until the AHJ, utility, fuel contractor, and manufacturer requirements are confirmed. Redesign, relocation, added plans, engineering, or trade work requested after quote approval requires a written change.

Put permit and utility coordination on named line items

“Permit included” is too vague when several agencies or trades can be involved.

Use a responsibility table in the statement of work attachment:

Seattle City Light tells customers not to connect a generator directly to household wiring without transfer equipment because of backfeed risk. Its public page says a standby-generator transfer switch must be installed by a licensed electrician and approved by the utility. That is a Seattle rule and utility process, not proof that every utility uses the same approval step.

The quote should therefore state:

• the serving utility;
• whether utility review is confirmed, expected, or still unknown;
• who submits documents and pays utility charges;
• whether a planned service outage is required;
• expected notice or lead-time assumptions without promising the utility’s date;
• whether the customer must be onsite or provide meter/equipment access;
• what happens if the utility changes equipment, location, or disconnect requirements; and
• whether temporary power is excluded during the outage.

If the utility or AHJ date moves, issue a written update using the schedule-change notice workflow. Do not let a utility-controlled date become an undocumented contractor guarantee.

Break the price into work packages

One generator line item hides too many separate responsibilities.

A reviewable quote can separate:

Use the five-line quote summary at the top so the customer can see the proposed system, the loads included, principal exclusions, price and payment terms, expiration, and acceptance method. Keep the full load schedule, equipment list, one-line, responsibility table, assumptions, and change triggers behind it.

The approval record should identify the quote number and version, selected option, accepted total, approval date, and person with authority to approve the property work. The federal ESIGN Act generally prevents a covered signature or contract from being denied legal effect solely because it is electronic, but it does not erase other contract, disclosure, consent, record-retention, state-law, or consumer-protection requirements. Match the acceptance method to the actual job and jurisdiction, then carry the same approved scope into the work order and invoice.

Make exclusions specific enough to price later

“Anything not listed is excluded” is not enough for a generator job.

Call out likely boundaries:

• service upgrade or panel replacement not specifically listed;
• correction of existing code violations, damage, corrosion, water entry, or unapproved prior work;
• engineering, sealed drawings, survey, geotechnical, floodplain, wind, or structural design not listed;
• gas meter, regulator, fuel tank, propane, trenching, or fuel piping not listed;
• utility fees, transformer work, meter relocation, easements, or extended outages;
• concrete, paving, landscaping, irrigation, wall, ceiling, paint, roof, fence, or finish restoration;
• asbestos, lead, contaminated soil, or other hazardous-material work;
• fire-alarm, elevator, medical, life-safety, or legally required standby interfaces;
• solar, battery, EV, demand-response, or energy-management changes not listed;
• remote monitoring subscription, cellular service, Wi-Fi, network support, or customer device setup;
• fuel supply during outages and ongoing maintenance after the included handoff;
• operation of loads outside the approved schedule; and
• permit or inspection corrections caused by concealed or pre-existing conditions outside the quoted work.

Then name the stop triggers:

Contractor will stop the affected work and request written approval if the existing service arrangement, panel condition, available fault-current information, grounding or bonding configuration, raceway route, fuel capacity, generator location, utility requirement, permit classification, connected-load list, solar/battery interaction, or customer-requested operating plan differs from the approved documents.

Use a change order before buying different equipment, moving the generator, adding circuits to generator power, changing the transfer arrangement, enlarging the trench, rebuilding service equipment, or accepting added restoration work.

Give the crew a work order, not the sales proposal

The accepted proposal explains the customer’s choice. The work order controls field execution.

The work-order safety briefing guide is useful here because generator work can combine utility coordination, more than one electrical source, service equipment, lifting, trenching, fuel work, weather, public access, and testing.

The field packet should include:

• approved quote, scope attachment, one-line, equipment submittals, and permit documents;
• utility contact, outage confirmation, meter and service instructions;
• generator, transfer equipment, controls, and accessory model numbers;
• approved generator load schedule and load-management settings;
• circuit and equipment labeling plan;
• normal and alternate source identification;
• deenergizing, verification, lockout/tagout, and reenergizing steps under the shop’s safety program;
• site access, excavation, underground utility, lifting, fuel, weather, and public-protection controls;
• inspection hold points and work that may not be concealed before approval;
• startup and test procedure from the manufacturer and approved design; and
• stop-work contacts and approval authority.

OSHA’s portable-generator fact sheet says a generator must not be attached directly to a structure unless a qualified electrician has properly installed transfer equipment.

For work covered by OSHA’s construction standards, 29 CFR 1926.416 requires the employer to determine before work whether an energized circuit could be contacted and to protect employees from that hazard; 29 CFR 1926.417 covers tagging deactivated controls and deenergized circuits. Where the general-industry rule in 29 CFR 1910.333 applies, exposed live parts generally must be deenergized unless a stated exception applies, and a qualified person must verify the deenergized condition. OSHA-approved State Plans may use different or additional requirements and must be at least as effective as federal OSHA.

The customer work order does not replace the employer’s electrical-safety program, training, protective equipment, or energy-control procedure. It should preserve the job-specific facts and stop points without pretending to be a complete energized-work procedure.

Define “startup complete” before final payment

The generator starting is not the whole acceptance test.

The closeout record should identify what was actually checked under the approved procedure:

• permit and inspection status;
• generator, transfer equipment, controller, and accessory model and serial numbers;
• normal-source condition before test;
• generator start command and stabilization;
• transfer from normal to alternate source;
• circuits or loads observed while on generator power;
• load-management or shedding response checked within the approved test scope;
• voltage, frequency, current, alarms, or other readings required by the manufacturer, design, or AHJ;
• retransfer to normal source and generator cooldown or shutdown;
• emergency shutdown and control functions tested where applicable;
• leaks, noise, vibration, exhaust, weather protection, and visible site condition;
• labels, directories, warning signs, and access clearances completed;
• open items, failed tests, declined work, and who is responsible for retesting;
• customer training topics; and
• manuals, keys, warranty documents, maintenance schedule, and service contact delivered.

DOE’s operations-and-maintenance guidance emphasizes that standby generators and automatic transfer switches need ongoing maintenance to remain reliable. Do not sell the handoff as “maintenance-free.” State whether the quote includes only startup, the first scheduled service, a maintenance agreement option, or no ongoing service.

Use the completion sign-off to record acceptance and open items. Use the warranty document to separate manufacturer equipment coverage, the fuel contractor’s work, utility equipment, third-party controls, remote monitoring, routine maintenance, consumables, and the electrical contractor’s workmanship.

Attach labeled photos using Photo Requirements on Every Work Order. A useful set can include the existing service before work, equipment nameplates, raceways before concealment, trench depth reference where required, grounding and bonding details within the approved inspection scope, generator and transfer equipment, labels, pad and anchorage, exhaust direction, fuel handoff, final panel directories, and open exclusions.

A field-ready generator quote checklist

Use this before sending a fixed installation price.

The best generator quote is not the one with the largest kW number.

It is the one that tells the customer and the crew exactly what will receive backup power, how the two sources will be controlled, what site and fuel work is included, who handles the approvals, which assumptions control the price, and what documentation closes out the job.

Sources

• National Fire Protection Association, NFPA 70, National Electrical Code, 2026 edition, especially Articles 445, 700, 701, and 702 for generator and standby-system context.
• Occupational Safety and Health Administration, Using Portable Generators Safely, OSHA 3286, for transfer-switch, backfeed, grounding, weather, electrical, carbon-monoxide, and fire-safety context.
• Occupational Safety and Health Administration, 29 CFR 1926.416, General requirements, and 29 CFR 1926.417, Lockout and tagging of circuits, for construction-work electrical-hazard and circuit-tagging requirements.
• Occupational Safety and Health Administration, 29 CFR 1910.333, Selection and use of work practices, for deenergizing, verification, qualified-person, lockout/tagout, and reenergizing context.
• Occupational Safety and Health Administration, State Plans, for the state-plan coverage and at-least-as-effective federal baseline.
• U.S. Department of Energy Federal Energy Management Program, Equipment Operations and Maintenance Summaries, accessed July 12, 2026, for standby-generator and automatic-transfer-switch operation and maintenance context.
• Federal Emergency Management Agency, FEMA P-1019, Emergency Power Systems for Critical Facilities: A Best Practices Approach to Improving Reliability, September 2014, for system-level load, distribution, transfer, fuel, reliability, and commissioning context.
• U.S. Consumer Product Safety Commission, Generators and Engine-Driven Tools, accessed July 12, 2026, for portable-generator carbon-monoxide and placement warnings.
• Miami-Dade County, Generator Permits, accessed July 12, 2026, for one jurisdiction’s site-plan, electrical, fuel, structural, zoning, and permit submittal requirements.
• Seattle City Light, Generators, accessed July 12, 2026, for utility-specific transfer-switch approval and backfeed guidance.
• UL Solutions, Switch Certification and Evaluation Services, accessed July 12, 2026, for UL 1008 automatic and nonautomatic transfer-switch application categories.
• U.S. Congress, 15 U.S.C. 7001, Electronic Signatures in Global and National Commerce Act, for federal electronic-signature context without displacing other contract, notice, or consumer-protection requirements.

---

This article is general information, not project-specific electrical, engineering, safety, code, licensing, fuel-gas, fire-protection, contract, or legal advice. Before pricing or installing a system, verify the classification, load calculation, equipment, permits, utility process, contract terms, test plan, and maintenance requirements with the AHJ, adopted codes and amendments, serving utility, manufacturer instructions, and the licensed professionals responsible for the work.