Standby Generator Installation Quote Checklist: 15 Questions to Ask (2026)

Before signing a standby generator installation quote, ask for a complete written scope—not just the generator’s sticker price. This homeowner checklist explains what to compare when hiring a qualified installer in the United States. It is a buying guide, not electrical or gas installation instructions.

What should a complete installation quote include?

According to Generac’s quote guidance, a typical proposal includes the generator, automatic transfer switch, installation labor, electrical work, fuel connection and site preparation. Permits, inspections and optional accessories may also apply. Request an itemized total rather than assuming any of these are included.

15 questions to ask before accepting a quote

1. Which circuits and appliances will be backed up?

List essential loads such as refrigeration, lighting, sump pump, medical equipment and heating or cooling. Ask the installer to document the proposed backup coverage.

2. How was generator size calculated?

Request the load calculation and an explanation of motor starting demand. Square footage alone is not an adequate substitute for discussing the actual loads.

3. What generator model is being quoted?

Get the exact model number, fuel type, rated capacity and manufacturer warranty documents. This helps compare like-for-like proposals.

4. Is the automatic transfer switch included?

Ask for its make, model and scope of electrical work. A correctly installed transfer switch isolates generator power from the utility supply.

5. Is the proposal for whole-home or selected-circuit backup?

Make sure the contract clearly identifies any excluded loads or load-management equipment.

6. What fuel supply changes are required?

Ask whether existing natural-gas service or propane capacity is adequate, who evaluates it, and whether additional piping or equipment is priced separately.

7. Where will the generator sit?

Request a proposed site drawing. Placement must follow the specific unit’s manual and applicable local rules, including exhaust, openings, service access and drainage.

8. What foundation or pad is included?

Clarify whether grading, a manufactured base, concrete or gravel preparation is included and who handles restoration of disturbed landscaping.

9. Who obtains permits?

Have the contractor identify the required electrical, mechanical, fuel or zoning approvals for your location and state who pays their fees.

10. Are inspections and utility coordination included?

Ask who schedules inspections and whether meter, panel or utility service changes could create extra charges.

11. Are the electrical and fuel contractors appropriately licensed?

Check credentials and insurance as required by your state or municipality. Generac advises working with qualified professionals for this complex installation.

12. What is the expected timeline?

Separate equipment delivery, permitting, site work, connections, inspections and commissioning. Delays can arise before the physical installation day.

13. What testing is performed at handover?

Ask for a documented commissioning procedure, including simulated utility outage and transfer-switch operation. Obtain the owner’s manual and maintenance instructions.

14. What ongoing maintenance and warranty service are available?

Compare service response, maintenance plans, registration requirements, parts and labor exclusions. Ask who handles warranty claims.

15. What triggers a change order?

Request a written process for unforeseen site conditions, extra electrical work, gas-line changes or permit requirements. Avoid open-ended verbal allowances.

What should the total installed price look like?

As a manufacturer-provided reference, Generac says many complete home standby installations average approximately $8,000–$16,000 including the generator. This is not a universal market quote: the model, fuel infrastructure, electrical upgrades, labor and local permitting can materially change the price. Get several current local estimates and compare scope as well as price.

Red flags in an installation proposal

• No exact generator or transfer-switch model.
• No written load or backup-coverage explanation.
• Unclear responsibility for permits, inspections or fuel connections.
• Large exclusions hidden outside the quoted total.
• No commissioning, maintenance or warranty information.
• Pressure to sign before the site assessment.

How to compare two quotes fairly

Put both estimates into the same table: generator model and capacity; protected circuits; transfer switch; fuel connection; site preparation; permits; electrical changes; inspections; commissioning; warranty; exclusions; payment schedule; and total. A lower quote may omit work that the higher quote includes.

Frequently asked questions

Can I install a standby generator myself?

These systems involve potentially hazardous electrical and fuel connections. Generac recommends qualified professional installation and following applicable codes and the specific equipment manual. Do not treat a consumer checklist as a DIY installation guide.

Does every quote include permits?

No. Ask the contractor to identify each required permit and inspection in writing; requirements depend on the location.

Is the generator price the same as the installed price?

No. Transfer equipment, labor, fuel work, site preparation and possible upgrades can account for a substantial share of the final cost.

Bottom line

The best standby generator quote is the one with a clear load assessment, safe and code-compliant scope, documented total cost and reliable post-installation support. Compare at least two itemized proposals before committing.

Sources

• Generac: Home standby generator quote guidance
• Generac: Backup generator installation and costs
• Generac: Installation safety and professional guidance