Negative keywords are words or phrases you add to your Google Ads campaign to prevent your ads from showing when someone includes those terms in their search. Think of them as a filter: regular keywords tell Google when to show your ad, and negative keywords tell Google when NOT to show your ad. Without them, a plumber bidding on "plumber" will get clicks from people searching "plumber salary," "plumber training," and "how to be a plumber", none of whom will ever hire them.
In my experience managing local service campaigns, adding a proper negative keyword list saves 25-40% of ad spend immediately. That's not an exaggeration. The first time I audit a campaign that's been running without negatives, I consistently find that one-third of their clicks came from completely irrelevant searches. At $20-30 per click for service keywords, that adds up to hundreds or thousands of dollars wasted every month.
How do negative keywords actually work?
When someone types a search query into Google, the algorithm checks if your keywords match. If they do, it then checks your negative keyword list. If the search query contains any of your negative keywords, your ad is blocked from showing, and you don't pay for that click.
Here's a practical example for a plumber:
| Search Query | Your Keyword | Negative Keyword | Ad Shows? | Why |
|---|---|---|---|---|
| "plumber near me" | plumber | , | Yes | Relevant search, potential customer |
| "plumber salary" | plumber | salary | No | Job seeker, not a customer |
| "how to fix a leaky faucet" | plumber | how to | No | DIY searcher, won't hire you |
| "emergency plumber 24 hour" | plumber | , | Yes | High-intent, great lead |
| "plumber training courses" | plumber | training | No | Someone entering the profession |
| "plumber tools home depot" | plumber | tools | No | Shopping for tools, not hiring |
Without the "salary," "how to," "training," and "tools" negatives, all six searches would trigger your ad. You'd pay for four clicks from people who have zero chance of becoming a customer. At $22 per click, that's $88 wasted from just these four searches.
The math scales quickly. A typical local service campaign gets hundreds of searches per month. If 30% are irrelevant and you're paying $20/click, a $2,000 monthly budget loses $600 to waste. Over a year, that's $7,200 you could have spent on actual potential customers.
What are the three negative keyword match types?
Negative keywords have three match types, broad, phrase, and exact, and they work differently from regular keyword match types. Understanding the differences is important because using the wrong match type can either block too much or too little.
| Match Type | Symbol | Blocks When | Example Negative | Blocks | Doesn't Block |
|---|---|---|---|---|---|
| Broad (default) | no symbol | Query contains ALL words in any order | plumber salary | "plumber salary," "salary for plumber," "average plumber salary 2026" | "plumber" alone, "plumber near me" |
| Phrase | "quotes" | Query contains the exact phrase in order | "plumber training" | "plumber training courses," "best plumber training" | "training to be a plumber" (different word order) |
| Exact | [brackets] | Query matches exactly | [plumber salary] | "plumber salary" only | "average plumber salary," "plumber salary 2026" |
For most local service businesses, I recommend using broad match negatives for your main negative keyword list. Broad negatives cast the widest net, which is what you want, if someone's search includes the word "salary," you don't want to show your ad regardless of what else they typed.
Use phrase match negatives when you want to be more precise. For example, you might add "how to" as a phrase negative so it blocks "how to fix a drain" and "how to unclog a toilet" but doesn't accidentally block a search you can't anticipate.
Use exact match negatives rarely, only when broad or phrase would block too much. An example: [free plumbing advice] as an exact negative blocks that specific query without blocking "free estimate plumbing" (which you DO want).
One critical difference from regular keywords: negative broad match does NOT include synonyms, misspellings, or related terms. The words must actually appear in the search query. This means you need to add both "DIY" and "do it yourself" as separate negatives, Google won't connect them for you on the negative side.
How do I find negative keywords for my campaign?
The primary source is your Search Terms Report in Google Ads. Go to Keywords > Search terms to see the actual queries that triggered your ads. Sort by cost (highest first) and look for any search that's clearly irrelevant, that's money you're currently wasting.
Here's my process:
- Check search terms weekly for the first month, this is when you'll catch the most waste
- Sort by cost (descending), fix the most expensive problems first
- Look for patterns, not just individual terms, if you see "plumber salary," "plumber pay," and "plumber income," the pattern is job-seeker searches. Add "salary," "pay," "income," and "wage" as negatives
- After month one, check bi-weekly, new irrelevant terms surface as Google learns and expands your keyword matching
- Export to a spreadsheet quarterly, look for category-level patterns you might miss in the UI
Beyond the search terms report, there are other ways to build your negative list:
- Google Keyword Planner, search your main keywords and scan the suggestions for irrelevant terms
- Google Autocomplete, type your service keyword and see what Google suggests. "Plumber" autocompletes to "plumber salary," "plumber near me," "plumber snake", you can spot negatives from the suggestions
- Industry negative keyword lists, every category has known negative terms. Starting with a pre-built list saves you weeks of wasted spend while you wait for your own data
If you want a head start, our negative keyword tool provides pre-built, category-specific lists based on search term data from hundreds of real campaigns. It's faster than building your list from scratch and covers the terms you'd eventually discover anyway.
What negative keywords does every local service business need?
There's a universal set of negative keywords that applies to virtually every local service business. These block job seekers, DIY researchers, students, and other non-customers. I add these to every campaign on day one before a single ad runs.
Universal negative keywords (add to every local service campaign):
| Category | Negative Keywords |
|---|---|
| Job seekers | salary, jobs, hiring, careers, employment, wage, pay scale, job description, indeed, glassdoor, resume |
| Education | training, courses, school, degree, certification, apprenticeship, how to become, classes, university |
| DIY / Research | how to, DIY, tutorial, video, youtube, diagram, manual, guide, fix it yourself, home depot, lowes |
| Parts / Products | parts, tools, equipment, supplies, wholesale, catalog, amazon, walmart |
| Unrelated | free, cheap (use carefully), craigslist, reddit, yelp reviews, complaints, lawsuit, scam |
A word of caution about "free" and "cheap" as negatives: they can be useful but also block legitimate searches. "Free estimate plumber" is a real customer. "Free plumbing advice" is not. I recommend using "free" as a phrase match negative paired with specific terms rather than a broad negative. For example: "free advice," "free tips," "free tutorial" as phrase negatives, but NOT "free" alone.
What are the best negative keywords for specific industries?
Each industry has its own unique set of irrelevant searches. Here are category-specific negative keyword lists I've built from analyzing real search term reports across hundreds of campaigns:
Plumber negatives:
- snake rental, plumber putty, plumbing code, septic, plumber crack, water pressure regulator, PVC pipe, pipe fitting, solder, flux
- how to unclog, how to fix, how to install toilet, how to replace faucet (all DIY intent)
HVAC negatives:
- HVAC school, refrigerant, HVAC technician salary, ductwork diagram, thermostat manual, HVAC certification, window unit, portable AC, MERV rating, filter size
- how to change filter, how to program thermostat
Electrician negatives:
- electrical engineering, wire gauge, circuit breaker diagram, electrician school, junction box, conduit, NEC code, multimeter, volt meter, electrical tape
- how to wire, how to install outlet, how to replace switch
Roofer negatives:
- roofing materials, shingle calculator, tar paper, ice dam, roof pitch calculator, roofing nailer, roofer salary, roofing felt, drip edge
- how to repair roof, how to install shingles, DIY roof
Locksmith negatives:
- locksmith training, lock picking, key blank, key fob battery, locksmith tools, lock bumping, padlock, combination lock, lock rekeying kit
- how to pick a lock, how to open a locked door
Dentist negatives:
- dental school, dental hygienist salary, dental assistant, dental insurance, denture adhesive, teeth whitening kit, toothache home remedy
- how to whiten teeth, how to floss
These lists aren't exhaustive, they're starting points. Your search terms report will surface terms specific to your market that no generic list would include. For comprehensive, regularly updated negative keyword lists for all 30+ service categories, check our negative keyword tool.
How much money do negative keywords actually save?
In my experience, a proper negative keyword list saves 25-40% of total ad spend for local service campaigns. The exact savings depend on how broad your targeting is and how competitive your market is, but I've never audited a campaign without negatives that wasn't wasting at least 20%.
Here's real data from campaigns I've analyzed:
| Scenario | Monthly Budget | Wasted Before Negatives | Savings After Negatives | Net Effect |
|---|---|---|---|---|
| Plumber, no negatives | $2,000 | $680 (34%) | $680 redirected to real leads | 4-5 additional leads/month |
| HVAC, basic negatives only | $3,000 | $450 (15%) | Added 200+ negatives → saved $300 more | 2-3 additional leads/month |
| Electrician, comprehensive list | $1,500 | $150 (10%) | Well-managed from start | Already efficient |
| Roofer, no negatives, broad match | $5,000 | $2,100 (42%) | $2,100 recaptured | 8-10 additional leads/month |
The roofer example is extreme but real. Broad match keywords without negatives are a recipe for waste. Google will match "roof repair" to "roof repair DIY," "roof repair cost estimate calculator," "roof repair video tutorial," and dozens of other non-customer searches.
The compounding effect is what makes negatives so powerful. The budget you save doesn't disappear, it gets redirected to relevant searches. So you're not just cutting waste; you're increasing the budget available for clicks that actually convert. A $2,000 campaign wasting 30% is really a $1,400 campaign. Fix the negatives and you've given yourself a $600/month raise without spending more.
How often should I update my negative keyword list?
Check your search terms report and add new negatives weekly for the first 60 days, then bi-weekly after that. Your negative keyword list is never "done", new irrelevant searches surface constantly as Google expands matching and search behavior changes.
Here's the maintenance schedule I recommend:
| Timeframe | Frequency | Focus |
|---|---|---|
| Weeks 1-4 | Every 3-4 days | High-frequency waste terms, obvious irrelevant categories |
| Months 2-3 | Weekly | New patterns, seasonal irrelevant terms, competitor brand queries |
| Months 4+ | Bi-weekly | Long-tail irrelevant terms, emerging search trends |
| Quarterly | Full audit | Export all search terms, analyze in spreadsheet, look for missed patterns |
Most campaigns plateau around 200-400 negative keywords after 6 months of active management. After that, new additions slow to a trickle, maybe 5-10 per month.
One warning about over-negating: it's possible to block too aggressively. If you add "repair" as a broad negative to a plumbing campaign, you'll block "pipe repair near me", a great keyword. Always check how many impressions a term has before negating it, and consider using phrase or exact match negatives for borderline terms. I've seen campaigns where overzealous negatives reduced impression volume by 50%.
Should I use a negative keyword list or add negatives directly to campaigns?
Use a shared negative keyword list at the account level. This applies your universal negatives (job seekers, DIY, education) to every campaign automatically, while still allowing you to add campaign-specific negatives individually.
The setup:
- Create an account-level shared list, Tools > Shared library > Negative keyword lists > Create. Name it "Universal Negatives" and add your industry-wide terms
- Apply the list to all campaigns, this ensures every campaign benefits from your negative keywords, including new campaigns you create later
- Add campaign-specific negatives individually, terms that are irrelevant for one campaign but not another (e.g., "commercial" might be negative for a residential-only campaign but relevant for a commercial services campaign)
Some advertisers also create separate lists by category: "Job Seeker Negatives," "DIY Negatives," "Competitor Negatives." This makes it easier to manage and audit your negatives over time.
At VibeAds, when we generate campaigns for local service businesses, we automatically include category-specific negative keywords from day one. The system also monitors search terms and flags new negatives as part of its automated optimization cycle. But whether you use a tool or manage them manually, the principle is the same: start with a strong list on day one and maintain it consistently.
An honest caveat: negative keywords are powerful but they're not a substitute for proper campaign structure. If your ad groups are a mess and your keywords are too broad, negatives are just a bandaid. Fix the structure first, then use negatives to catch what slips through.
Can negative keywords hurt my campaign if I use them wrong?
Yes. Over-negating is a real risk, especially if you use broad match negatives carelessly. Adding "service" as a broad negative to an HVAC campaign would block "AC repair service near me", one of your best keywords. The damage from over-negating (lost legitimate traffic) can be worse than the waste you were trying to prevent.
Common negative keyword mistakes:
| Mistake | Example | Consequence |
|---|---|---|
| Too-broad negatives | Adding "repair" as broad negative for a plumber | Blocks "pipe repair near me," "faucet repair service" |
| Negating your own keywords | Adding "plumber" variations as negatives | Literally blocks your own ads from showing |
| Not checking existing keywords | Adding "installation" as negative while bidding on "water heater installation" | Keyword and negative conflict, negative wins |
| Set and forget | Never updating the list after initial setup | New irrelevant terms pile up, old negatives may become outdated |
| Only using broad match negatives | All negatives as broad when some need phrase/exact | Over-blocking legitimate variations |
The golden rule: before adding any negative keyword, search for it in your existing keyword list. If there's a conflict, use phrase or exact match on the negative to be more precise. And if you're unsure, add it as a phrase match negative first, you can always upgrade to broad later if the waste continues.
If you want to check whether your negative keywords (or lack thereof) are costing you money, our free audit quiz evaluates your negative keyword strategy as one of seven key campaign health factors. It takes 3 minutes and tells you exactly where your budget is leaking.