Written Warranty Language Design

Why this matters

A contractor's warranty is the single legal document the customer reads (the invoice and contract often aren't carefully reviewed). It's also the document that determines liability when something goes wrong. Vague warranty language ("workmanship warranted") gives the customer unrealistic expectations and the contractor no defense. Specific warranty language ("18-month workmanship warranty on labor; parts per manufacturer warranty; specifically excludes [list]") sets expectations clearly and protects against scope creep. Getting the warranty right is a one-time investment with ongoing benefit; most contractors use boilerplate that doesn't fit their work. The contractor with a thoughtful, specific warranty closes more sales (customers trust clarity) and faces fewer disputes (the language settles questions before they escalate).

What a warranty does

A warranty:

• Defines what is covered (work, parts, both)
• Defines the duration (90 days, 1 year, 5 years)
• Defines exclusions (what is NOT covered)
• Defines the remedy (repair, replace, refund)
• Defines the conditions for coverage (proper use, normal wear)
• Defines the customer's obligations (notification, access)
• Defines the contractor's obligations (response time, scope of fix)

A weak warranty has missing or vague provisions; a strong warranty addresses all of these explicitly.

Two warranties on every invoice

Most service work has two warranties:

Workmanship warranty (the contractor's promise)

Covers the labor and installation quality. Typical duration: 90 days to 2 years residential; longer for specific industries.

Examples:

• "Workmanship warranty: 1 year from date of completion. Covers defects in labor and installation by [Contractor]. Excludes damage from misuse, modification by others, normal wear, and environmental causes."

Manufacturer's warranty (the parts manufacturer's promise)

Covers the parts. Pass-through from manufacturer to customer. Duration per the manufacturer (typically 1 to 10 years for HVAC parts; 1 year for many plumbing parts).

Examples:

• "Parts warranty: per manufacturer. [HVAC unit] carries a 10-year compressor warranty and 5-year parts warranty from [Manufacturer]; see attached manufacturer literature for terms."

These should be presented separately on the invoice so the customer understands what is what.

Standard warranty components

1. Coverage scope

Specify exactly what is covered:

• Workmanship (labor) only?
• Parts only?
• Both?
• Specific components only?

Example: "This warranty covers the labor and installation of the [specific work]. It does not cover any other portion of the customer's [system, property, etc.]."

2. Duration

Specific time:

• "90 days from completion"
• "1 year from completion"
• "5 years from completion" (longer terms for specific industries)

Avoid: "as long as [Contractor] is in business" - too vague, creates expectation that the company will exist forever.

3. Exclusions

List specifically what is NOT covered:

• Customer-caused damage
• Misuse of equipment
• Modification by others (including DIY)
• Acts of nature (storm, flood, fire)
• Normal wear and consumables (filters, batteries)
• Pre-existing conditions
• Damage from related systems (e.g., HVAC warranty doesn't cover electrical damage)

Example: "Excludes: damage from customer misuse or modification; damage from acts of nature; consumable items including filters and batteries; pre-existing conditions in customer's property; failures of components not installed by [Contractor]."

4. Remedy

Specify what the contractor will do:

• "Repair: [Contractor] will repair or replace at our discretion the failed portion of [installed work]."
• "Refund: in our discretion, [Contractor] may issue a refund for the failed portion in lieu of repair."

Avoid: vague language like "make it right" - what does that mean?

5. Conditions

What the customer must do:

• Provide reasonable access to the work area
• Notify [Contractor] promptly of any failure
• Not modify or repair the work themselves
• Maintain the equipment per manufacturer recommendations

Example: "Customer must notify [Contractor] within [time period] of any defect; failure to notify within this period voids the warranty."

6. Geographic and operational limits

• "This warranty is valid only at the property where the work was performed."
• "If customer sells the property, warranty transfers per [terms]."
• "Service is performed only during normal business hours; after-hours emergency service may incur additional charges."

7. Limitation of liability

The legal cap on the contractor's liability:

• "[Contractor]'s liability under this warranty is limited to the amount paid for the work. We are not liable for consequential damages including but not limited to lost income, loss of use, or damage to other property."

Some states limit how this can be written; verify against state law.

State-specific considerations

Each state has consumer-protection laws that affect warranty language:

• California: specific consumer protections; some warranty exclusions are not enforceable
• New York: similar
• Massachusetts: 90-day implied warranty
• Texas: specific disclosure requirements

Have your warranty reviewed by a local attorney once for state compliance, then adapt as state law changes.

Implied vs express warranties

Under the Uniform Commercial Code (UCC) and state law:

• Express warranty: the warranty you write and provide
• Implied warranty of merchantability: the law's default; the work is fit for ordinary purpose
• Implied warranty of fitness for a particular purpose: if the customer told you a specific use and you proceeded

Implied warranties can be disclaimed in some cases; the disclaimer language must be conspicuous (typically all caps or bold).

Example disclaimer: "EXCEPT AS EXPRESSLY STATED IN THIS WARRANTY, [CONTRACTOR] DISCLAIMS ALL OTHER WARRANTIES INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE."

Whether disclaimers hold up in court varies by state.

Service contract vs warranty

A maintenance service contract (annual tune-up plan) is separate from a warranty. The two should be clearly distinguished:

• Warranty: covers defects in the installed work
• Service contract: customer pays for regular maintenance and gets preferential service

Don't conflate them in the customer's mind.

Transferability

Standard residential warranties may or may not transfer to the next owner of the property:

• Some warranties are non-transferable
• Some transfer for a fee
• Some transfer free

References

• UCC (Uniform Commercial Code) Article 2-313 (Express Warranties).
• UCC Article 2-314 and 2-315 (Implied Warranties).
• Magnuson-Moss Warranty Act (15 USC 2301-2312) - federal consumer warranty law.
• State consumer protection laws.
• Better Business Bureau (BBB) standards.
• Manuall internal: Universal Estimating Quoting, Universal Customer Trust After Mistake.