Negative Keywords Strategy for Google Ads: How to Filter Out Junk Traffic and Improve Lead Quality
Most home service Google Ads accounts have a single negative keyword: 'free.' That's a tip-of-the-iceberg list. Here's the operator's playbook for building a negative-keyword strategy that quietly doubles lead quality.
title: "Negative Keywords Strategy for Google Ads: How to Filter Out Junk Traffic and Improve Lead Quality" slug: "negative-keywords-google-ads-home-services" date: "2026-05-18" author: "Justin Hubbard" category: "Google Ads" tags: ["negative keywords", "google ads optimization", "lead quality", "ppc strategy", "home service marketing"] excerpt: "Most home service Google Ads accounts have a single negative keyword: 'free.' That's a tip-of-the-iceberg list. Here's the operator's playbook for building a negative-keyword strategy that quietly doubles lead quality." description: "The home service operator's playbook for negative keywords in Google Ads — how to start, what to exclude on day one, how to mine search-term reports weekly, and the discipline that filters out junk traffic." ogImage: "/writing-covers/negative-keywords-google-ads-home-services.jpg" canonical: "https://adimize.com/writing/negative-keywords-google-ads-home-services" piece_id: "P-014" published: true
If your Google Ads negative-keyword list has fewer than 50 items, your campaign is donating money to Google.
I've audited dozens of home service Google Ads accounts. The pattern is brutal: most have somewhere between zero and ten negative keywords in the entire account. They're getting calls from people looking for free service, scrap yards, the wrong city, the wrong trade, products instead of services — and they keep paying for those clicks every week.
Negative keywords are the single highest-leverage Google Ads optimization that costs nothing. They make your existing budget worth 30–50% more. And most operators don't touch them.
- Stop paying for "free."
- Stop paying for "scrap."
- Stop paying for "DIY."
- Stop paying for product searches.
- Stop paying for searches in cities you don't serve.
This is the operator's playbook for negative keywords in Google Ads for home service businesses: what to exclude on day one, what to mine out of search-term reports every week, and the discipline that turns a leaky bucket into a money printer.
For the foundational Google Ads playbook, see Google Ads for home services.
What Negative Keywords Actually Do
Negative keywords tell Google "do not show my ad for searches that include these terms." That's it.
A homeowner Googles "free junk removal." Without "free" as a negative, your ad shows. They click — you pay. They call asking if you'll pick up their stuff for nothing. You say no. They hang up. You paid $8 for a guaranteed-no-business phone call.
Multiply that by every "free," every "DIY," every "scrap," every wrong-city search across a year of campaign running. Five-figure money, easily, for most home service operators.
Negative keywords are how you stop bleeding.
The Day-One Negative-Keyword List
When you launch a new campaign, the single most important negative is "free." That filters out the largest single bucket of unqualified searches in home service.
Beyond that, the right philosophy is start mostly empty and build from real data. If you pre-load 200 negatives based on a generic template, you'll accidentally block some terms that would have converted. Better to start tight and let the search-term report tell you what's actually showing up.
That said, here's a sensible starter list for most home service businesses, day one of a new campaign:
Universal negatives (almost every home service business should have these):
- free
- DIY
- how to
- yourself / "do it yourself"
- diy
- jobs / hiring / employment / career
- salary / wage / pay
- coupon / discount / cheap
Service-mismatch negatives (commonly mistaken-intent searches):
- For junk removal: scrap, scrapyard, junkyard, recycling center, buy junk, sell junk, donate
- For HVAC: install yourself, parts, DIY repair, ductless install diy, HVAC supply
- For plumbing: parts, valves, fittings, plumbing supply, home depot
- For roofing: shingles for sale, roofing supplier, materials, roof products
- For dumpster rental: small dumpster (if you only do roll-offs), portable toilet (if you don't do portable rentals)
Geographic negatives (cities/areas you don't serve, even if close):
- Add every city outside your service area that's geographically close enough to trigger searches
- Add zip codes if you have premium-area zoning
Industry-adjacent negatives:
- Words for products vs. services (parts, supplies, equipment for sale)
- Words for adjacent trades you don't do
- Words for jobs/careers in your industry
A tight day-one list of 30–50 negatives gets you most of the way. Then you add 5–15 a week from search-term mining.
How to Mine Search-Term Reports Weekly
The Search Terms report in Google Ads shows you every actual search that triggered one of your ads. Not your keywords — the literal queries people typed. This is the single most valuable report in your account, and most operators look at it once per quarter at best.
The weekly process (15 minutes):
1. Pull the report for the last 7 days. Filter by your highest-spend campaigns.
2. Sort by cost, descending. Look at the top 30 search terms by spend.
3. For each one, ask: did this search match my intent?
- ✅ Yes, this is a real customer query → leave it.
- 🟡 Maybe / unclear → flag for monitoring.
- ❌ Wrong intent, wrong service, wrong location, wrong product/service mix → add as negative.
4. For irrelevant terms, decide the right match type for the negative.
- Exact match
[free junk removal]— blocks only that exact phrase - Phrase match
"free junk"— blocks any query containing that phrase in order - Broad match
free junk— blocks queries containing those words in any order (use carefully)
For most home service businesses, phrase match negatives are the sweet spot. They're aggressive enough to catch variants but specific enough to not over-block.
5. Apply at the right level. Some negatives belong campaign-wide. Some belong only to a specific ad group. Don't add a negative campaign-wide if it would block a relevant search in another ad group.
6. Save the list. After a few months you'll have a tight, custom-built negative list that's worth its weight in gold. Export it. Use it as the starter for any new campaign.
15 minutes a week. Single highest-ROI ongoing task in Google Ads management.
The "Scrap Yard Problem" (And Other Confused-Intent Calls)
A specific pattern that bites home service operators: people calling because they think you're a different business than you are.
Example: junk removal companies routinely get calls from people looking for scrap yards. Why? Because the company's website mentions "scrap metal removal" as a service, Google associates the business with scrap-yard-adjacent terms, and people searching "scrap yard near me" find them.
The fix is two layers:
Layer 1: Negative keywords on the paid side. Add "scrap yard," "junkyard," "scrap metal buyer," "metal recycling" as negatives. Stops your ad from showing for those searches.
Layer 2: Website content. Decide whether you actually want to advertise scrap metal services at all. If yes, keep it on the site but make it crystal clear what you do and don't do (you'll remove scrap, not buy it). If no, take it off the site entirely. Otherwise organic search will keep sending confused calls.
The same pattern shows up for:
- Appliance removal → people calling for "free appliance removal" or "appliance repair"
- Dumpster rental → people calling for portable toilets, storage pods, or moving trucks
- Demolition → people calling for demolition contractors when you only do interior demo
Wherever you offer a sub-service that's commonly confused with something else, the negative-keyword list and the website content need to work together.
When NOT to Use Negative Keywords
Some operators get so aggressive with negatives that they accidentally block valuable traffic. Common over-blocking mistakes:
1. Blocking informational terms that lead to commercial intent. "How much does X cost" sounds informational, but in many home service categories that exact search is high-intent — homeowners researching right before they call. Don't blanket-block "how" or "cost" without checking conversion data first.
2. Blocking emotional/urgent language. "Help" sounds vague but "help with junk removal" or "help me clear out my garage" are real customer queries.
3. Over-localizing. Blocking every city you don't serve is sometimes too aggressive — a customer in your service area might Google "junk removal Chicago" while actually living in a suburb you cover. Use geographic targeting settings first; use city-name negatives only when you're certain they're consistently producing wrong-area calls.
4. Blocking competitor names you should be bidding on. Don't add your competitors as negatives in your main campaigns — those are conquests you want to bid on (in a competitor campaign, not your core one). Run them as a separate campaign instead.
The rule: any negative you add should have specific evidence in the search-term report or call-log that it's producing junk traffic. Don't speculate. Don't follow generic templates blindly. Verify before you block.
Negative Keyword Lists at the Account Level
Once you've built up a strong list, organize it. Google Ads lets you create shared Negative Keyword Lists that apply to multiple campaigns at once.
The recommended setup:
- Master Universal List: the never-show-for-these terms (free, DIY, jobs, salary, etc.) — applied to every campaign.
- Service-Specific Lists: per-service negatives — applied only to the relevant campaigns.
- Geographic Negatives List: wrong-area terms — applied to all campaigns, but checked when expanding service area.
- Industry Mismatch List: wrong-trade or wrong-product terms — applied to all campaigns.
Maintaining lists at the account level (instead of duplicating negatives across every campaign manually) means new campaigns inherit your accumulated knowledge from day one. Highly underused feature.
Negative Keywords for Performance Max
PMax campaigns have limited negative-keyword support compared to standard Search campaigns. Historically you needed to contact Google Ads support to add account-level negatives that apply to PMax. As of recent updates, more direct controls have been added, but they're still narrower than Search.
For PMax specifically:
- Use brand exclusions (lists of brand/competitor terms you don't want to bid on)
- Use account-level negatives where possible
- Don't expect the same precision as in Search campaigns
- Lean more heavily on audience signals and asset quality to drive intent
If precise negative keyword control matters more than PMax's reach extension, keep your dollars in Search-only campaigns. For most operators, Search remains the core and PMax is a bolt-on.
The Quarterly Negative-Keyword Audit
Every quarter, set aside 60 minutes for a deeper negative-keyword audit. The process:
1. Pull the full search-term report for 90 days.
2. Sort by spend, descending.
3. For the top 100 spend search terms, classify each:
- Converting → keep
- Not converting, but right intent → monitor (maybe a Quality Score / landing-page problem, not a negative-keyword problem)
- Not converting, wrong intent → add as negative
4. Look at your existing negative list. Any terms that are now obsolete? Any that are blocking traffic you'd want? Prune.
5. Update your shared lists. Apply learnings to your account-level negative lists so future campaigns benefit.
6. Check the bottom of the search-term report too. Terms with low spend but bad intent — they add up. Catch them before they grow.
60 minutes a quarter. Single most underappreciated marketing task.
For the broader conversion-quality framework this lives inside, see Google Ads conversion optimization for home services.
What to Do This Week
👉 Audit your current negative-keyword list. Count it. If you have under 30 negatives total across the account, that's the problem.
👉 Add the day-one negatives if they're missing. Free, DIY, jobs, hiring, salary, coupon, salvage, scrap (if you don't do scrap).
👉 Pull the search-term report for the last 30 days. Sort by cost. Look at top 50 terms. Add negatives for any wrong-intent queries.
👉 Create a shared negative-keyword list at the account level if you don't have one. Move your universal negatives into it.
👉 Schedule weekly 15-minute search-term reviews. Same day every week. Calendar event.
The Bottom Line
Negative keywords are the boring half of Google Ads management. They're also where the cheapest wins live.
Most home service Google Ads accounts have between zero and ten negatives. That's a campaign quietly bleeding 20–40% of its budget on searches that will never convert. The fix is a 15-minute weekly habit and a quarterly deeper audit. It costs nothing. It pays back forever.
Stop paying for free. Stop paying for DIY. Stop paying for the wrong trade and the wrong city. Mine your search-term report religiously. Build the shared lists. Apply them across campaigns.
Then watch the same budget produce 30–50% more booked jobs. Same ads, same keywords, same landing pages — just less waste.
That's the entire game in two words: filter aggressively.
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I built Adimize because too many home service operators were running campaigns with virtually no negative-keyword strategy, donating 20–40% of their budget to wrong-intent traffic. Tell me about your business and I'll send you a free read on what you should be blocking — and what you're missing.
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