A standby generator installation in the US typically involves three contracts: the equipment manufacturer warranty (Generac, Kohler, Briggs & Stratton, Cummins), the installer's labour warranty, and a financing or service agreement. Each operates on different terms, and they rarely align. Homeowners regularly discover after the fact that the manufacturer warranty was voided because of how the installer set up the equipment, or that the installer's warranty does not cover the parts the manufacturer warranty would cover.
What is a Residential warranty and installer liability?
A residential standby generator installation contract covers the supply and installation of a permanent backup generator (typically natural gas or propane, rated 10-26 kW), an automatic transfer switch, the gas line connection, the electrical wiring, and required permits and inspections. The contract should specify the equipment model, who pulls and pays for permits, the scope of warranty coverage, ongoing maintenance obligations, and what happens if the installation fails inspection.
Red flags to watch for
Installers should pull electrical, mechanical, and sometimes building permits as part of the contracted work. A clause shifting permit responsibility to you means you bear liability for unpermitted work that could affect insurance claims and resale.
Most manufacturer warranties require registration within 30-60 days of installation. If left to the homeowner and missed, the warranty period is reduced significantly. The installer should register on your behalf and provide proof.
Industry-standard installer warranties on labour run 1-5 years. Anything less than one year is sub-standard and suggests the installer is shielding themselves against early-life failures.
Manufacturer warranties typically require documented annual maintenance. If the contract is silent on who does this and how it is documented, manufacturer warranty claims can be denied.
If the gas line cannot supply sufficient pressure under load, the generator will fail. Installers should test gas pressure as part of commissioning. A clause excluding gas line issues from the installer's responsibility shifts a foreseeable problem to you.
Whole-home transfer switches require more careful load calculation. A managed (load-shedding) transfer switch is sometimes installed without clearly disclosing that not all circuits will run simultaneously during an outage.
Disposal of old transfer switches, generators, or wiring is often charged separately and surprises homeowners at the final invoice stage.
Your legal rights
Federal law provides protections under the Magnuson-Moss Warranty Act (15 U.S.C. §§ 2301-2312) for written warranties on consumer products. State-level rights vary: most states have home improvement contractor licensing and bonding laws (e.g. California Business and Professions Code § 7159, New York Lien Law Article 36-A, Florida Statute § 489.126) and Unfair and Deceptive Acts and Practices (UDAP) statutes that apply to deceptive installer conduct. The National Electrical Code (NEC, NFPA 70) and International Fuel Gas Code govern the installation technically — failure to meet code can void insurance coverage. Most homeowner insurance policies require disclosure of the installation and compliance with code.
Questions to ask before you sign
- 1Is the installer licensed for both electrical and gas work in my state, and is the licence current?
- 2Who pulls and pays for permits — and what are the typical fees in my jurisdiction?
- 3Will the installer register my manufacturer warranty and provide proof of registration?
- 4What is the labour warranty period and what does it cover — parts, labour, callbacks, troubleshooting?
- 5Who is responsible for annual maintenance, and does the contract include the first year?
- 6Is the transfer switch whole-home or load-managed, and which circuits are prioritised during an outage?
- 7What is the gas line pressure test result, and is it documented in the commissioning report?
- 8What happens if the installation fails inspection — who pays for remediation and re-inspection?
Disclaimer: This guide is for educational purposes only and does not constitute legal advice. Contract law varies by jurisdiction and individual circumstances. Always consult a qualified legal professional before making decisions based on this information.