Warranties and guarantees for service work: how to write and honor them

A clear warranty tells the customer exactly what you'll fix for free, for how long, and what isn't covered. Separate your own labor warranty from the manufacturer's parts warranty, write both down in plain words, keep records of what you installed and when, and honor claims quickly. A guarantee you stand behind is one of the strongest reasons a customer picks you over a cheaper competitor.

This guide covers the types of coverage, how to write your terms, how to account for the cost, and how to handle a claim. Warranty and consumer protection laws vary by state, so have an attorney review your final wording.

What's the difference between a warranty and a guarantee?

People use the words loosely. For a service business it helps to separate three things:

• Manufacturer's parts warranty. The maker of the equipment or part covers defects for a period. The manufacturer sets the terms, and they often require proper installation and sometimes registration.
• Your labor or workmanship warranty. Your promise that the work you did was done right, and that you'll fix problems caused by your workmanship for a set period at no charge.
• Satisfaction guarantee. A broader promise about the customer's experience, like "if you're not happy, we'll come back and make it right" or a money-back promise on certain services.

Customers often assume a "warranty" covers everything, including your labor to replace a part the manufacturer covers. Many parts warranties don't include labor. Spell that out.

What laws should you know about?

This is general information, not legal advice. Some basics to raise with your attorney:

• Implied warranties. In many states, the law implies certain promises in a sale, such as that goods are fit for their ordinary purpose, and services may carry an implied promise of being done in a workmanlike manner. Whether and how these can be limited depends on state law.
• Written warranties on consumer products. The federal Magnuson-Moss Warranty Act sets rules for written warranties on consumer products, including disclosure requirements in some cases. It applies to products, so it matters when you sell and install equipment.
• Home improvement rules. Some states require specific terms in home improvement contracts, and some set minimum warranty periods for certain kinds of construction.
• Advertising. If you advertise "guaranteed" or "lifetime warranty," the terms need to be clear and available. Vague claims invite complaints.

How long should your labor warranty be?

There's no standard. It depends on your trade, the type of work and how much risk you're willing to carry. Common patterns:

• Repairs: a period of weeks to a year on the specific repair.
• New installations: often longer, sometimes one to several years on workmanship, with optional extended plans.
• Maintenance and cleaning: often a satisfaction guarantee, like a free re-clean or re-visit within a short window, rather than a long warranty.

Ask yourself: How long would a workmanship problem typically take to show up? How long can you afford to promise? What do strong competitors in your area offer?

Longer warranties can be part of your "better" and "best" options. For example, a one-year labor warranty on the basic repair and a longer one on the premium option. That's a real, understandable difference customers can choose.

What should a written warranty include?

Keep it short and readable. A good warranty answers:

1. Who is giving the warranty (your business name).
2. What's covered: the specific work or equipment.
3. For how long, starting when: the completion date, usually.
4. What you'll do: repair, replace, re-perform the service or refund.
5. What's not covered: damage from misuse, accidents, lack of maintenance, work done by others, acts of nature, normal wear, cosmetic issues.
6. What the customer must do: maintain the equipment as recommended, report problems promptly, allow access.
7. How to make a claim: phone, email, portal.
8. Whether it transfers to a new homeowner.
9. The manufacturer's warranty, referenced separately, with any registration steps.

Sample plain-language labor warranty

Adapt this with your attorney. It's a starting point, not legal language:

Our workmanship guarantee. [Company] guarantees the workmanship on the work described on this invoice for [period] from the date the work was completed. If a problem caused by our workmanship appears during that time, we'll return and correct it at no charge for labor. This guarantee doesn't cover damage from accidents, misuse, lack of recommended maintenance, or work performed by others. Parts and equipment are covered by their manufacturers' warranties, which may have their own terms and registration requirements. To make a claim, call us at [phone].

How do you handle manufacturer registration?

Many equipment manufacturers offer longer parts coverage only if the product is registered within a set time after installation. Rules differ by manufacturer and product, so check each one.

Make registration part of your install checklist:

• Record model and serial numbers on the job.
• Register within the manufacturer's window, or give the customer clear instructions if they need to do it.
• Save the confirmation in the customer's record.
• Tell the customer what coverage they have and for how long.

Doing this for the customer is a service they'll remember, and it saves an argument years later when a part fails.

How do you account for warranty costs?

Warranty work isn't free. It costs labor, travel and sometimes parts. Plan for it:

• Track every warranty visit as a job with a zero or reduced charge, so the cost doesn't disappear.
• Calculate your warranty cost per job type. For example, total warranty labor and parts for installs last year ÷ number of installs = warranty cost per install.
• Build that into your prices. If installs average a certain warranty cost each, that cost should be in your install price, not a surprise in your margins.
• Look for patterns. A spike in warranty claims on one type of job or from one technician points to a fixable problem.

How should you handle a warranty claim?

1. Respond fast. The customer is already worried. Book the visit quickly.
2. Check records first. What was done, when, which parts, and what the warranty says.
3. Diagnose fairly. If it's covered, say so and fix it. If it's not, explain why, kindly and clearly, and offer options.
4. Handle the gray areas generously. When it's unclear, many owners lean toward the customer. The goodwill is usually worth more than the cost.
5. Document the outcome. Cause, fix, cost and whether it was covered.
6. Follow up a few days later.

For the conversation itself, see handling complaints and callbacks.

How do you use warranties to sell, honestly?

• Mention your warranty when presenting options, not as small print.
• Put warranty length next to the price on each option, so customers can compare.
• Don't oversell. "Lifetime" means different things to different people. Be specific about what's covered and for how long.

Our post on presenting options at the kitchen table shows where warranty fits in the conversation.

FAQ

Should I offer a lifetime warranty? Only if you've defined exactly what "lifetime" means (the customer's ownership, the equipment's life or the life of your business) and you've priced in the cost. Many shops find a clear fixed period simpler.

Does my warranty cover manufacturer-defective parts? Usually the manufacturer covers the part and your labor warranty covers your workmanship. Whether you charge labor to replace a defective part under the manufacturer's warranty is your decision. Put it in writing either way.

Is a warranty transferable to a new owner? Only if you say so. Transferable warranties can help homeowners sell their home, which can be a selling point.

Do I need an attorney to write my warranty? It's a good idea. State consumer protection and home improvement laws vary, and an attorney can make sure your wording is clear and compliant.

How ServFlo helps

In ServFlo, each quote option can carry its own warranty, which shows next to the price when you present options. The text customers agree to when they sign off a job or approve a quote is yours to edit in Settings, and ServFlo saves exactly what each customer saw and signed. Photos, notes and sign-offs stay on the job record. On the Pro plan, equipment tracking keeps model, serial number, install date and warranty end date for each unit at a property. See quotes and invoicing and Customers and CRM.