Straight answers for local service businesses
A negative keyword is a word or phrase you tell Google to ignore, so your ad never shows for searches that include it. It costs you money when you skip it because Google matches your ads to loosely related searches like "plumber salary," "how to fix a leaky faucet," or "free estimate app," and you pay for every one of those clicks. Adding 30 to 50 negatives and checking your search terms report monthly usually cuts wasted spend fast without lowering the number of real calls you get.
You set a budget of $40 a day. Google spends it. You get clicks. You get almost no calls. Then you look at what people actually searched, and half of it is "HVAC technician salary" and "how to unclog a drain yourself."
That is the negative keyword problem. It is the single most common way a small trade business quietly loses money on Google Ads, and it is also one of the easiest things to fix.
A negative keyword is a word or phrase you add to your account to tell Google: if someone's search includes this, do not show my ad.
Regular keywords tell Google when to show you. Negative keywords tell Google when to shut up. You need both, because Google does not match your ads only to your exact keywords. It matches to searches it thinks are related, and its idea of "related" is much looser than yours.
Say you bid on water heater installation. Without negatives, Google may also show your ad for:
Every one of those can cost you a click. Some cost you $15 or more in competitive trades. None of them will ever call you.
Because doing nothing is a choice, and Google's default settings are built to spend your budget, not to protect it.
Three settings do most of the damage:
Combine loose matching with an empty negative list and you get exactly what most contractors describe: plenty of clicks, no phone ringing.
Open the search terms report. This is the most useful screen in Google Ads and most business owners have never opened it.
Your keyword list is what you hoped people would search. The search terms report is what they actually typed. The gap between those two is your leak.
You will spot patterns within a minute. A landscaper sees "landscaping jobs hiring." A painter sees "paint colors for living room." An electrician sees "electrician apprenticeship." Those are not customers. Block them.
Start here. These five buckets cover most of the waste for trades.
jobs, hiring, salary, career, apprentice, apprenticeship, resume, training, school, certification, license, union, near me hiring
diy, how to, how do i, tutorial, youtube, video, reddit, forum, guide, tips, fix myself, homemade
free, cheap, cheapest, discount, coupon, low income, assistance program, grant, government, volunteer, charity
parts, supply, wholesale, rental, rent, used, for sale, amazon, home depot, lowes, harbor freight, definition, meaning, what is, salary, insurance claim, lawsuit
Add city and state names you do not serve. If you only do residential, add commercial, industrial, apartment complex, HOA, and property management. If you do not do warranty work, add warranty. If you do not touch septic, add septic.
That last bucket is where the real money is. Generic negative lists are easy. The negatives that pay off are the ones specific to the work you refuse to do.
Add them at two levels. Build one negative keyword list in Shared Library for the account-wide junk (jobs, DIY, free, competitors' brands). Apply it to every search campaign. Then add campaign-specific and ad-group-specific negatives for things like keeping your "drain cleaning" ad group from stealing traffic from "water heater."
Match types work slightly differently for negatives:
One warning. Negative keywords do not use close variants the way positive keywords do. If you block plumber jobs, you have not blocked plumbing jobs or plumbers jobs. Add the variations, including common misspellings you see in the report.
Once a week for the first month, then monthly. Fifteen minutes each time. Sort by cost, scan for junk, block it, close the tab.
Search behavior changes with the seasons. A HVAC company sees a completely different set of search terms in July than in January. New junk shows up. The list is never done, but it gets much shorter to maintain after the first two cleanups.
No. Local Services Ads (the Google Guaranteed ones at the very top) do not run on keywords at all, so there is nothing to negate. You control those with your job type settings and your service area, and you dispute bad leads directly in the LSA dashboard. Do that consistently. It is the LSA version of the same job.
Negative keywords are not an advanced tactic. They are basic hygiene. But they are invisible work, so they are the first thing an agency skips and the last thing a busy owner thinks about.
If you are spending on Google Ads and cannot name five negative keywords in your account, you are almost certainly paying for clicks from people who will never hire you.
Open the search terms report tonight. Read the top 40. You will know within five minutes whether your money is going where you think it is.
There is no magic number, but most local service accounts should have 30 to 50 within the first month and a few hundred after a year of regular cleanup. Quality matters more than quantity. Ten negatives pulled from your own search terms report beat 200 copied from a generic list.
Yes, if you get too aggressive. Blocking a broad word like "repair" or "cost" can wipe out real customers, since plenty of people search "water heater repair cost" before they call. Block words that signal the wrong intent, not words that just make you nervous about price.
No. Negative keywords only apply to paid ads. They have no effect on your organic rankings, your map listing, or your Google Business Profile.
Usually it is a match type or variation issue. Negative keywords do not automatically cover plurals, misspellings, or close variants, so blocking "plumber salary" will not block "plumbing salaries." Check that you added the negative at the right level too, since an ad group negative will not protect your other campaigns.
If your budget is small, start with phrase match and exact match until you have a solid negative list built. Broad match can work once you have real conversion data and a well-maintained negative list, but on a tight budget it usually spends money on searches you would never have chosen yourself.
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