Paid Advertising
Negative keywords: the fastest way to cut wasted ad spend
Most contractor Google Ads accounts waste 20 to 30 percent of their budget on searches that will never become a booked job. Negative keywords block that traffic in minutes, and the savings show up in the same billing cycle.
A negative keyword tells Google not to show your ad for a search you do not want, like a homeowner typing "how to remodel a kitchen yourself." It is the closest thing paid search has to a free lunch. WordStream's 2024 benchmarks estimate that 20 to 30 percent of the average account's budget is spent on irrelevant clicks, and with the average search CPC at $5.26 in 2025, that waste is expensive. The fix is not a new bidding strategy or a rebuilt landing page. It is mining your search terms report, choosing the right match types, building shared lists, and running the same loop every month.
Why wasted spend hides in plain sight
Every keyword you bid on can match searches you never intended to buy. A broad match for "bathroom remodel" can serve on "bathroom remodel ideas" or "how to retile a shower yourself." Those clicks cost the same as a serious homeowner's, but they almost never convert, so they quietly drag your cost per lead up. WordStream's 2024 benchmark data put the leak at 20 to 30 percent of the average account's budget, and with the all-industry CPC at $5.26 in 2025, every wasted click is real money walking out the door.
The reason it hides is that the top-line numbers look fine. Your spend pacing is normal, your clicks are flowing, and your campaign dashboard shows green. The waste only surfaces when you read the actual queries that triggered your ads. Google made broad match the default for new Smart Bidding campaigns in mid-2024, which widens the net further, so the searches that drain your budget rarely match the tidy keyword list you typed in. You have to go looking for them.
Mine the search terms report
The search terms report shows the exact queries people typed before your ad appeared. It is the single best source of negative keywords, and WellBuilt treats it as the first place to look in any wasted-spend audit. Open a campaign, click Keywords, then Search terms. Sort by cost, pull the last 30 days, and read down the list. Any query that spent more than your target cost per acquisition with zero conversions is a negative keyword. Any query with the wrong intent, like "jobs," "free," "DIY," or "salary," is a negative keyword whether it converted by accident or not.
Frequency matters as much as the first pass. Most practitioners review search terms weekly for high-spend or broad-match campaigns and at least monthly for everything else, because search behavior shifts and new junk queries appear constantly. A query that converted last quarter can turn into dead weight this one. The work itself is fast: ten to fifteen minutes per campaign once you know the patterns. The payoff is immediate, because blocked traffic stops costing you the moment the negative is live.
Intent signals that almost always belong on a negative list:
- Free, cheap, discount, coupon: price-shoppers, not buyers
- Jobs, salary, careers, hiring: job seekers, not customers
- DIY, how to, template, tutorial: people doing it themselves
- Reviews, vs, complaints: researchers still comparing options
- Unrelated products or services that share a word with yours
Choose the right negative match type
Negative keywords come in broad, phrase, and exact match, and they behave differently from their positive counterparts. Negative broad blocks searches that contain every word in your term, in any order, but only when every word is present. Negative phrase blocks searches that contain your term as a contiguous phrase. Negative exact blocks only the precise query with no extra words. By default, Google adds negatives from the search terms report as exact match, which is the safest setting but also the narrowest.
There is a trap most advertisers miss: negative keywords do not match close variants, plurals, or misspellings the way positive keywords do. Block "job" and you still serve on "jobs." Google did start blocking misspellings of negatives in June 2024, but synonyms and plurals are still on you. The practical rule: use negative phrase for intent themes you want to catch across many variations, reserve negative exact for protecting a high-value term you cannot afford to block by accident, and add the singular and plural of anything that matters.
A negative keyword is the closest thing paid search has to a free lunch: it stops the wrong click before you ever pay for it.
Build shared negative keyword lists
Adding negatives campaign by campaign does not scale. The fix is shared negative keyword lists in your account's library, where one themed list can be applied across every relevant campaign at once. Build a universal blocklist for terms that should never trigger an ad anywhere: competitor names, job searches, and zero-intent words. Then build narrower lists by theme, like a "free tier" list or an "informational intent" list, and apply each only where it fits. Update the list once and every attached campaign inherits the change.
Know the limits before you build. Google allows up to 20 negative keyword lists per account, with up to 5,000 keywords in each. Account-level negatives that apply everywhere are capped at 1,000 terms, so reserve those for your most universal exclusions. Performance Max now supports campaign-level negatives too, raised to 10,000 per campaign in March 2025, which finally lets you control the search and shopping inventory that used to run unchecked. Apply lists deliberately, because a negative that helps one campaign can choke a relevant query in another.
The CPL impact you can expect
Negative keywords work on both sides of the cost-per-lead equation at once. They strip out clicks that were never going to convert, which lowers cost, and they raise your click-through rate by keeping ads off mismatched searches, which feeds Quality Score and pulls your CPC down further. An Optmyzr study of roughly 2,600 accounts in 2023 found exact match beat broad match on CTR in 85.6 percent of accounts, the same relevance gain disciplined negatives create. With the average Google Ads cost per lead at $66.69 in 2024 and $70.11 in 2025, trimming the waste is one of the few levers that moves CPL without touching bids or budgets.
The case studies are blunt. One law firm paired phrase match with a thorough negative list and watched CTR climb from 1.5 percent to 16 percent, with conversion rate reaching 5.61 percent inside two months. Another excluded "DIY," "template," and "online" to filter out self-help searchers and reported a 24 percent CTR lift and a 42 percent jump in conversions. Results vary by account, but the mechanism is consistent: every irrelevant click you stop buying is budget redirected to a search that can actually close.
Run the monthly loop
Negative keyword work is not a one-time cleanup; it is a recurring routine. Once a month, pull the search terms report for the trailing 30 days, sort by cost, and flag every zero-conversion query that spent past your target CPA. Add the clear waste to the right shared list, choosing phrase match for themes and exact for surgical blocks. Then audit your existing lists to confirm you have not accidentally blocked a search for a new product, promotion, or brand term you have since started selling.
Pair the cull with a quick sanity check on impression share and CTR so you can see the relevance gain land. For high-spend or broad-match-heavy accounts, tighten the cadence to weekly. The whole loop takes under an hour for most accounts and compounds: each pass makes the next search terms report cleaner and your spend more concentrated on intent. WellBuilt runs this loop as a standing line item in account management, because no other task returns budget this fast for this little effort.
Key takeaways
- Pull the search terms report monthly, sort by cost, and add any zero-conversion query that spent past your target CPA as a negative.
- Use negative phrase match for intent themes and negative exact for surgical blocks; remember negatives ignore plurals and synonyms, so add both.
- Build shared negative lists by theme, plus a universal blocklist for jobs, competitors, and zero-intent words, then apply them across campaigns.
- Block intent signals like free, cheap, jobs, DIY, and salary that drain budget even when the keyword itself looks relevant.
- Tighten the review cadence to weekly for high-spend or broad-match campaigns, since the average account leaks 20 to 30 percent of budget on irrelevant clicks.
SourcesWordStream Google Ads Benchmarks, 2024 · WordStream Google Ads Benchmarks, 2025 · LocaliQ Search Advertising Benchmarks, 2025 · Google Ads Help, About negative keywords and match types, 2024 · Google Ads Help, Create and apply negative keyword lists, 2024 · Optmyzr, broad vs. exact match CTR study (~2,600 accounts), 2023 · OnTheMap, Law Firm PPC Case Study (Nunez Law), 2024 · FasterCapital, Successful Negative Keyword Strategy Case Studies, 2024 · Search Engine Land, Performance Max and negative keyword list limits, 2025
Questions, answered straight.
How much can negative keywords actually save?
It depends on how much waste you are carrying, but WordStream's 2024 data pegs the average account at 20 to 30 percent of budget spent on irrelevant clicks. A first thorough pass often recovers a meaningful slice of that within the same billing cycle because blocked traffic stops costing you immediately. Audit your search terms report before assuming your account is clean; most are not.
What match type should I use for negative keywords?
Use negative phrase match for intent themes you want to catch across many searches, like "free" or "jobs," and negative exact match when you need to block one specific query without risking related ones. Google adds report negatives as exact by default, which is safe but narrow. Because negatives do not match plurals or synonyms automatically, add the singular, plural, and common variants of anything important.
How often should I review my search terms report?
Monthly is the minimum for any active account, and weekly is better for campaigns with high spend or broad match keywords, where junk queries pile up fast. Each review takes ten to fifteen minutes per campaign once you know the patterns. Put it on a recurring calendar so it never slips, because the report only helps if you actually read it.
Do negative keywords help in Performance Max?
Yes, and the controls finally caught up in 2025. Google raised the Performance Max campaign-level negative keyword limit to 10,000 in March 2025, letting you exclude search and shopping queries that used to run unchecked. They still do not cover every placement, but they meaningfully reduce wasted spend on the inventory they do touch. Add your universal blocklist terms there as soon as you launch a Performance Max campaign.
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