Every dollar a local service business spends on Google Ads has to earn its keep. Plumbers, HVAC companies, and contractors across the GTA routinely lose 15 to 30 percent of ad budget to clicks that were never going to become a job: people looking for work, DIY instructions, or a company three regions away. Negative keywords fix this, and most accounts still don’t use them well.
This guide covers how negative keywords work, the tiered system that keeps a list organized as it grows, and a starter list built for local service businesses running Google Ads or Local Service Ads in Ontario.
Why Negative Keywords Matter for Your Ad Budget
Every campaign attracts search terms you never intended to bid on. A residential plumber running ads for “emergency plumber Mississauga” will also show up for “plumber jobs Mississauga,” “how to fix a leaky faucet,” and “free plumbing quote template.” None of those searchers are calling for service.
A well-maintained negative keyword list typically saves 15 to 30 percent of total ad spend while improving conversion rate, because the clicks that do get through are higher quality. Quality Score often improves too, since Google rewards ads with tighter relevance between keyword, ad, and landing page.
The problem is that most local business owners set up a campaign once, add a handful of obvious negatives, and never touch the list again. Search behavior shifts, new junk queries show up, and budget keeps leaking quietly in the background.
The Three Tiers of Negative Keywords
Negative keywords work best when organized by where they apply. A term that’s irrelevant for your whole account is different from one that’s only wrong for a specific service line.
| Tier | What It Blocks | Example Terms | Where to Apply |
|---|---|---|---|
| Account-level | Universally irrelevant searches | jobs, careers, salary, DIY, free, wikihow | Every campaign in the account |
| Campaign-level | Terms wrong for one service line or area | “commercial” on a residential-only campaign | One specific campaign |
| Ad group-level | Terms too broad for a tightly themed ad group | “drain cleaning” inside a “water heater install” ad group | One specific ad group |
Build the account-level list first. It does the most work with the least effort, and it should exist before a single dollar is spent. Most established accounts run 50 to 100 account-level negatives as a baseline.
Match Types for Negative Keywords
Negative keywords use the same match type logic as regular keywords, but in reverse. Getting the match type wrong is the most common reason a negative list doesn’t actually stop the waste it’s supposed to.
- Broad match negative: blocks any search containing all the words in any order. Safest for account-level terms like “jobs” or “hiring.”
- Phrase match negative: blocks searches containing the exact phrase in order. Useful for multi-word junk like “how to install.”
- Exact match negative: blocks only that precise search term. Best for narrow exclusions where broad match would cut off legitimate traffic.
A common mistake is adding a broad match negative that’s too aggressive, like blocking “repair,” and accidentally cutting off searches like “furnace repair near me.” Check the search terms report before adding anything at broad match.
Building a Starter List for GTA Service Businesses
Here’s the process that works whether you’re managing your own account or handing it to an agency:
- Pull the search terms report for the last 30 to 90 days.
- Tag every term as a real lead, a maybe, or clearly irrelevant.
- Add the irrelevant terms as account-level negatives before touching anything else.
- Review the report again monthly and add new negatives as patterns emerge.
A starter list that covers most GTA service businesses includes: jobs, hiring, careers, salary, how to, DIY, free, cheap, wikihow, reviews, complaints, BBB, Yelp, franchise, and the names of direct competitors you never want to fund a click for. “Near me” is context-dependent: it can be a strong buyer signal or a source of waste depending on your service area, so review it rather than blocking it outright.
For more on structuring campaigns around this kind of ongoing optimization, see our Google Ads automation strategies guide.
Negative Keywords and Local Service Ads
Local Service Ads (LSAs) don’t use keyword targeting the way standard Google Ads campaigns do. Google matches you to job categories and your defined service area instead, and you pay per lead rather than per click. You can still exclude specific job types you don’t service and tighten your service area radius, which functions similarly to a negative keyword for cutting mismatched leads.
As of mid-2025, LSA reviews run entirely through your Google Business Profile rather than a separate review system, which means your GBP rating now directly affects LSA visibility. That link between your local SEO and your ad performance is worth understanding before you split budget between the two. Our breakdown of Local Service Ads vs Google Ads covers which model fits which type of business.
What Changed in 2026
Google retired the separate Google Guaranteed and Google Screened badges in late 2025 and replaced them with a single Google Verified checkmark for LSA advertisers across every industry. The negative keyword mechanics on standard Search campaigns haven’t changed, but with GBP now feeding directly into LSA ranking, a clean review profile and a clean negative keyword list are doing more of the budget-protection work together than either one did alone.
FAQ
How many negative keywords should a local service business start with?
Aim for 50 to 100 account-level negatives before launching a campaign. This baseline list should already exist before you spend your first dollar, covering job-seeker terms, DIY searches, and generic irrelevant words.
Do negative keywords affect Quality Score?
Indirectly, yes. By blocking irrelevant clicks, negative keywords improve your click-through rate and relevance signals over time, which supports a stronger Quality Score and can lower your cost per click.
How often should a negative keyword list be updated?
Review the search terms report at least monthly. Search behavior shifts, and new irrelevant queries show up even on established accounts, so the list needs regular maintenance, not a one-time setup.
Do Local Service Ads need negative keywords too?
Not in the traditional sense. LSAs match on job category and service area rather than keywords, but excluding job types you don’t offer and tightening your service radius achieves a similar effect: fewer mismatched leads and less wasted spend.
Want to see where your Google Ads budget is actually going and whether your local search presence is pulling its weight? Get a free SEO audit from Cadiente Digital: cadientedigital.ca/seo-audit-services.