How to prove your specialty: evidence for contractor websites

1. What proves a specialty, and what doesn't
2. Why a specialty claim is harder to back up than it looks
3. What our recorded answers show about specialty claims
4. How to back up your specialty, step by step
5. Questions owners ask
6. How we got these numbers
7. Sources
8. See it on your own website

What proves a specialty, and what doesn't

Almost every contractor website says it specializes in something: tile roofs, tankless water heaters, panel upgrades, mini-splits. Customers see those words on every site. So do AI assistants like ChatGPT, Claude and Google AI Mode when they search for a contractor. The question is what makes your claim believable, to a homeowner and to an assistant that reads your pages.

The short answer: match each claim to evidence that fits it. Different claims need different proof.

• "We do this job" needs a clear page about the job: what it includes, what you do yourself and where you do it.
• "We're experienced at it" needs finished projects: photos, the town, the date and what you did, shared with the customer's permission.
• "We're licensed" or "certified" needs the exact credential, who holds it, what it covers and where someone can check it.
• "We stand behind it" needs written warranty terms that say who backs what and for how long.

Each piece of evidence proves only what it covers. A photo of a finished slate roof shows that someone did that job. It doesn't show that your license is current. A state license shows what the state lets you do. It doesn't show you've done a particular job a hundred times. Keep those limits visible and your claims stay honest and easy to check.

This matters more as customers ask AI assistants for help. Claude runs a search tool and grounds its answers in what it finds on the live web, with citations so people can check the sources ¹. ChatGPT rewrites a question into its own searches and warns that results can be incomplete or wrong ². Neither one checks your work for itself. Each can only pass along what it can read, and in our recorded answers they often said where a claim came from.

Why a specialty claim is harder to back up than it looks

"Specialist" is a word, not a credential

On its own, the word proves nothing. Anyone can type it. That doesn't make it meaningless, but it puts the burden on you. Under federal law, an advertiser needs a reasonable basis for its claims before the ad runs, and at least the level of evidence it says it has ³. If your page says "the area's leading tile roof experts", you should be able to show why.

A license has a scope, and the state sets it

A trade license is the strongest evidence most contractors have, but it covers specific work. In Florida, a certified contractor can work anywhere in the state, while a registered contractor may work only in the local areas where the registration applies ⁴. A specialty contractor's license is limited to a particular part of construction ⁴. Electrical specialty licenses are limited to a specific segment of electrical or alarm work ⁵.

So "licensed" alone says little. A customer wants to know licensed for what and where. Florida also requires your registration or certification number in every advertisement, in any medium ⁶. Anyone can look up a license by name or number on the state's site ⁷.

Some credentials belong to a person, not the company

Many certifications are earned by a technician, not by the business. Federal rules require technicians who service equipment that could leak refrigerant to be certified, and the tests are specific to the type of equipment ⁸. If one of your technicians holds a certification, say so. Don't imply that every person you send holds it. When that technician leaves, update the page.

A manufacturer's status is the manufacturer's to define

Brand programs, such as a roofing maker's certified contractor tiers or an equipment maker's dealer levels, come with their own rules. One roofing maker's 2026 program rules tell contractors to name their current certification and include a set disclosure. Its top tier must also meet renewal requirements each year ⁹. The same rules tie certain enhanced warranties to certain tiers ⁹. Use the program's exact name, keep it current and link to the maker's own listing of your business.

Also be careful what you let the badge imply. A dealer status shows that the maker lists you in its program. It doesn't, on its own, prove skill at every job that involves the brand.

A photo shows a job, not a qualification

Project photos are some of the best evidence you have, because they come from your own work. Google asks that Business Profile photos be in focus, well lit and not heavily altered, so they represent reality ¹⁰. But a photo has limits. It doesn't show your license, your insurance or which parts of the job you did yourself. Say who did what, especially when part of the work was done by another trade or a subcontractor.

Photos also involve your customer's home. Ask before you post them, and leave out house numbers and anything else that identifies the home unless the owner agrees.

A warranty is its own document

A warranty claim is only as clear as its written terms. The Federal Trade Commission's guide for businesses says deceptive warranty advertising is unlawful. It also warns that "lifetime" can mean the life of the product, how long the buyer owns it or the buyer's own life, so say which ¹¹. For contractors, there are often two warranties: the maker's warranty on materials or equipment, and your own warranty on the labor. Say which is which, and link to the terms.

An assistant repeating your claim is not verification

When ChatGPT or Claude describes your business as a specialist, it is usually passing along your own words. That can help a customer find you. It isn't an independent check. OpenAI says its search results and citations can be incomplete, outdated or incorrect ². Anthropic points Claude users to the cited sources so they can verify them ¹.

There is also some evidence that AI search leans on independent sources. A 2025 study of AI search engines found a strong tilt toward third-party sources over brands' own content ¹². That study looked at products and services in general, not local contractors, and it has not yet been peer reviewed. Our own answers, below, show assistants did read and link contractors' own sites. They also often said which facts came only from those sites.

What our recorded answers show about specialty claims

Between September 2 and October 14, 2026, we asked ChatGPT, Claude and Google AI Mode to recommend a local contractor 47,209 times. Of those, 41,561 asked about a specific job, such as slate roof repair or a panel upgrade: ChatGPT 17,275, Claude 14,467 and Google AI Mode 9,819. The questions covered HVAC, plumbing, electrical and roofing in towns around Tampa Bay, Florida. Each was asked in a fresh conversation with web search on. These are observations, not experiments. They show what the assistants did, not what causes a recommendation.

One pattern runs through all of this. Claude usually tells the customer what it couldn't confirm. It said it couldn't find or confirm something in 42% of its job answers. ChatGPT did in 1.4% and Google AI Mode in 0.2%. So the counts below that depend on an assistant saying something was missing come mostly from Claude. They show what Claude ran into, not how often every assistant was missing something.

Assistants told customers when a claim came from the company itself

In 3,104 job answers, the assistant passed a claim along and said it came from the business: "their site says", "they say they", "self-reported". Claude did this in 16% of its job answers and ChatGPT in 4.2%. We found these with word rules and checked a random sample by hand: 19 of 20 were sorted correctly.

The licensing claim comes from the company itself, so it isn't independently verified.

In other words, your own page gets you into the answer, but the assistant may label it as your claim. Evidence that someone else keeps, like a license record, doesn't get that label.

Without a page that said so, Claude didn't call anyone a specialist

In 383 of its job answers, Claude said it couldn't find a business that clearly specialized in the job, or that specifically advertised it. ChatGPT said this in 13 answers. A random sample checked by hand found 19 of 20 sorted correctly.

I couldn't confirm that any local company specifically advertises whole-house humidifier installs, so I can't point to one as a proven humidifier specialist.

I couldn't find any local company that advertises zoning installs specifically, so these are HVAC contractors in the area to ask about zoning, not confirmed zoning specialists.

The businesses in those answers may well do the work. The assistant just couldn't find a page that said so. It then named them as general contractors to call and ask, not as specialists.

The license was the claim assistants told customers to check

In 11,396 job answers, the assistant told the customer to check, confirm or ask for a license. That was 60% of Claude's job answers, 15% of ChatGPT's and 1.9% of Google AI Mode's. A hand check of a random sample found 19 of 20 sorted correctly.

• 8,014 job answers named Florida's state license lookup, including 49% of Claude's.
• 6.9% of ChatGPT and Claude job answers linked to an official license lookup page.
• 662 job answers said the assistant couldn't find or confirm a license or insurance. 647 of them came from Claude.

Their site doesn't list a license number or a warranty, so ask for both.

A customer who reads that line will ask you for the number. A page that shows it, with the name it is filed under, answers the question before it is asked.

Manufacturer status came up, and makers' own pages were linked

In 2,521 job answers, the assistant mentioned a manufacturer certification or dealer status, such as a roofing maker's certified tier or an equipment maker's dealer program. A random sample checked by hand found 20 of 20 correct. Some assistants went further and linked to the maker's own page for a dealer or contractor. That happened in 1,190 ChatGPT and Claude job answers (3.7%). We checked a random sample of those links: 20 of 20 were maker pages for a dealer or contractor.

Ask whether it's a manufacturer warranty and whether the contractor is a certified installer for that brand.

The maker's listing is a record you don't control, which is why it helps. It also means the listing must be current and match the name on your site.

For uncommon jobs, Claude told customers to ask for proof

In 252 job answers, across 45 different jobs, the assistant told the customer to ask for proof of past work. That meant photos, references, addresses of past jobs or how many of that job the contractor had done. A hand check of a random sample found 20 of 20 correct. Most came from Claude: 209 answers. The advice clustered on skilled or uncommon work. It appeared in 14% of answers about slate roof repair, 10% about cedar shake repair, 8.4% about commercial roofing and 7.3% about geothermal systems.

Ask how many slate repairs they've done in the last year and whether they can show photos of local jobs.

If you do work like that, the customer's first question is already written for you. A page with dated, local examples answers it.

What assistants weighed in our earlier study

Before this research, we studied assistant conversations from late July to August 2026 across eight trades. For each business an assistant considered, we recorded the reasons it gave for naming it or leaving it out. These are the reasons that bear on proving a specialty:

• Clearly doing the specific job asked about came up in 440 conversations and cost a business its place in 184 of them.
• Claims found only on the business's own site, treated as unconfirmed, came up in 186 conversations and cost a business its place in 67.
• A license claimed on the business's own site came up in 314 conversations and cost a business its place in 82.
• A license looked up in the official register came up in 142 conversations and cost a business its place in 103.
• A license number that matched between the business's pages and the register came up in 32 conversations and cost a business its place in 16.
• Manufacturer certifications came up in 124 conversations and cost a business its place in 13.
• A warranty came up in 150 conversations and cost a business its place in 16.
• Named technicians and their certifications came up in 114 conversations and cost a business its place in 4.

One conversation can involve several reasons, so these counts overlap and should never be added together. They show what assistants said they weighed, not what would change who gets named. Read together, they suggest a pattern. Badges and warranties came up often but rarely cost a business its place. Doing the specific job, and what an assistant found in the state's license records, mattered far more. When an assistant checked the register, the check often cost a business its place. The counts can't tell us whether the license was missing, expired or just hard to match.

How to back up your specialty, step by step

Work through these steps for each job you want to be known for. Start with the one that brings the most profit or the most calls.

1. Write the exact claim

Name the job, the equipment or material, the kind of property and the towns. "Tile roof repair for homes in Pinellas County" is a claim you can prove. "Roofing experts for every need" is not. If you only do part of a job, say which part.

2. Match each claim to the evidence that fits it

• We do this job: a page about the job that says what it includes, what it doesn't and who does the work.
• We're licensed for it: the license number, the license category, the name it is filed under and a link to the state lookup ^{6 7}.
• We're certified by the maker: the program's exact current name, the maker's required wording and a link to the maker's listing of your business ⁹.
• Our technicians are certified: which certification, who holds it and what equipment it covers ⁸.
• We've done many of these: finished projects with dates, towns and what you did.
• We guarantee it: the written warranty terms, who backs them and how long they last ¹¹.

If a claim has no evidence behind it, cut it or soften it until it is true ³.

3. Build a project record for each specialty job

For each finished job you want to show, keep a short record. Note the date, the town, the problem, what you did and the materials. Add whether a permit was pulled, plus before-and-after photos. Get the customer's permission before you publish. A short write-up of a real job is the first-hand detail Google asks for ¹³. Google also says a first-hand account adds something a summary of other pages can't ¹⁴.

Put the photos on the job's page, next to the text that describes them, with short captions and alt text that say what the photo shows ¹⁵. Add the same real, unedited photos to your Google Business Profile ¹⁰.

4. Say what you don't do

Boundaries make the rest believable. Say which towns you serve for this job, whether you work on homes, businesses or both, and which parts you hand to another trade. If your license is a local registration or a specialty category, don't describe it as broader than it is ⁴.

5. Make your license easy to check

Florida requires the license number in every ad ⁶. Put it on every page of your site too. Use the business name exactly as it appears on the state record. Link to the state's lookup, where anyone can search by name or number ⁷. In our answers, Claude told customers to check the license in most of its job answers, so make that check take seconds.

6. Date your credentials and review them every year

Write the year a certification was earned or last renewed. Set a reminder to check each one yearly. Manufacturer programs can require yearly renewal ⁹, and technicians come and go. Remove a badge the day it lapses. An out-of-date badge is worse than none.

7. Point to records other people keep

Your own page is your claim. The strongest support sits elsewhere: the state license record, the maker's dealer or contractor listing and your profiles on review sites. Make sure each one shows the same business name, phone number and specialty as your site. Link to them from your job pages so customers and assistants can find them.

8. Check what the assistants say, and fix the source

Ask ChatGPT, Claude and Google AI Mode the questions your customers ask, naming the job and the town, on several different days. Open the pages each answer cites ². If an answer says it couldn't confirm that you do the job, or couldn't find your license, the fix is on your pages or listings. You can't correct the assistant directly. Note the date of each change and check again a few weeks later. No one can promise a recommendation. Clear, checkable evidence removes the doubts assistants said they had.

Questions owners ask

How do I prove my business specializes in a certain type of work?

Match the claim to evidence that fits it. Publish a clear page about the job and show finished projects with dates and the customer's permission. List the license and any certifications with their real scope, and put warranty terms in writing. Then link to records others keep, such as the state license lookup or a manufacturer's listing of your business.

Should I put my contractor license number on my website?

Yes. Florida requires a contractor's registration or certification number in every advertisement, regardless of medium, so treat your website as one. Use the business name exactly as it appears on the state record and link to the state's license lookup so customers can check it in seconds. Other states have their own rules, so check yours.

Can I call my company certified if only one technician is certified?

Say exactly who holds the certification and what it covers. Many certifications, such as the federal refrigerant certification, belong to the technician and cover specific equipment. Saying the company is certified suggests everyone you send holds it. If one technician holds it, say so, and update the page if that person leaves.

Do project photos help my business show up in AI answers?

Nobody can say photos alone change who gets named. They do give customers real evidence of the work. Place each photo on the page about that job, near the text that describes it, with a short caption and alt text. Use real, unedited photos, ask the homeowner's permission first and leave out anything that identifies their home.

Does it count as proof if ChatGPT calls my business a specialist?

No. An assistant that calls you a specialist is usually repeating your own website. In our recorded answers, assistants often told customers when a claim came from the company itself. OpenAI warns its search results can be wrong. Treat a mention as a sign your pages are being read, not as independent confirmation of your skills.

See it on your own website

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Source: Merchant Context: the current website offer · checked 2026-10-14.

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