I’ve audited hundreds of Google Ads accounts over my career in San Diego and virtually every one of them — from small local businesses to 7-figure advertisers — shares a common set of mistakes. These aren’t exotic edge cases. They’re predictable, fixable, and they’re draining real money right now.
Here’s what I find most often, and what to do about it.
Mistake 1: Sending Traffic to the Homepage
This is the single most common and most expensive mistake I see. When someone clicks your ad for “emergency dentist San Diego,” they land on your homepage with no clear next step, competing navigation options, and zero connection to the ad they just clicked. Conversion rates for homepage traffic from paid search are typically 1-2%. Dedicated landing pages regularly hit 8-15% for the same traffic. That’s the difference between a $15 lead and a $150 lead on the same budget.
Fix: Build a dedicated landing page for each ad group or service. Match the headline to the ad. Remove navigation. One page, one goal.
Mistake 2: No Negative Keywords
Broad match and phrase match keywords will trigger your ads for searches you’d never intentionally target. I’ve seen a personal injury law firm paying for clicks on “personal injury first aid kit” and a med spa paying for “botox certification training.” These clicks are never going to convert and they’re wasting real budget every single day.
Fix: Pull the Search Terms Report weekly. Add anything irrelevant as a negative keyword. Build your negative keyword list from day one using obvious exclusions for your industry (DIY, free, training, jobs, etc.).
Mistake 3: Using Broad Match Without Guardrails
Google defaults new campaigns to broad match keywords. Broad match in 2026 is more permissive than ever — Google’s AI decides what’s “related” and that can mean your “car accident lawyer” keyword triggers for “how to represent yourself in a car accident case.” Not your customer.
Fix: Start new accounts with phrase match and exact match. Add broad match only once you have robust negative keyword lists and enough conversion data that Google’s AI has real signals to work with.
Mistake 4: Not Tracking Conversions (or Tracking the Wrong Things)
Running Google Ads without conversion tracking is like driving with no speedometer, no GPS, and no fuel gauge. You have no idea if what you’re doing is working. And yet I regularly see accounts where conversions aren’t set up at all — or where they’re counting page views as conversions, inflating the numbers and misleading every optimization decision.
Fix: Set up proper conversion tracking before any money is spent. Track form fills, phone calls, and purchases. Use thank-you page triggers, not page view counts. See my full guide on conversion tracking setup.
Mistake 5: Ignoring the Search Terms Report
The Search Terms Report shows you exactly what people actually typed before clicking your ad. This is the most actionable report in Google Ads. Most advertisers never look at it. It’s where you find your best negative keywords, discover new keyword opportunities, and understand what your customers actually call your service (which may be different from what you call it).
Fix: Review the Search Terms Report weekly. Add new irrelevant terms as negatives. Add high-performing new queries as exact match keywords.
Mistake 6: Setting It and Forgetting It
Google Ads is not a set-it-and-forget-it channel. Budgets change, competitors change, Quality Scores drift, landing pages break, offers expire. Accounts that go unchecked for 30+ days are almost always wasting money somewhere. I’ve seen client accounts auto-renewed on outdated holiday promotions running in March, spending $50/day driving clicks to a 404 page.
Fix: Weekly check-ins minimum. Review CTR, conversion rate, search terms, and budget pacing every week. Full optimization reviews monthly.
Mistake 7: Running Only One Ad Per Ad Group
If you only have one ad, you have nothing to test against. Ad copy testing is one of the highest-leverage activities in account management. Even a 0.5% CTR improvement compounded over a year significantly reduces your cost per lead.
Fix: Run at least 2 RSAs per ad group with different creative angles (benefit-led vs. offer-led, feature-focused vs. social proof-focused). Let Google test combinations and give it at least 300 impressions per ad before evaluating.
Mistake 8: Letting Google’s Default Settings Run Unchecked
When you create a new Search campaign, Google defaults to several settings that benefit Google more than you:
- Search Partners — extends your ads to non-Google search engines. Often lower quality traffic.
- Display Network expansion — shows your Search campaign budget on Display. Almost always reduces campaign efficiency.
- Automatically Applied Recommendations — Google can auto-apply changes to your account. These are not always in your best interest.
Fix: For new campaigns, uncheck Search Partners and Display Network until you have enough data to evaluate them separately. Disable auto-applied recommendations and review them manually.
Mistake 9: Poor Account Structure
Dumping all your keywords into one or two campaigns with no logical structure makes optimization nearly impossible. You can’t evaluate what’s working, you can’t write relevant ad copy for each theme, and your Quality Scores suffer from keyword-ad mismatch.
Fix: Organize campaigns by service line or product category. Within each campaign, group tightly related keywords into ad groups. Write specific ad copy for each group.
Mistake 10: Not Optimizing for Mobile
More than 60% of paid search clicks come from mobile. If your landing page is slow on mobile, has tiny text, or requires pinch-to-zoom, you’re converting a fraction of what you should be. Check your mobile conversion rate separately from desktop. If it’s significantly lower, you have a mobile experience problem.
Run a full audit to find every leak in your account. My 1-hour Google Ads audit guide walks through every layer systematically. Most of the mistakes above show up in the first 20 minutes.
Frequently Asked Questions
What is the number one Google Ads mistake small businesses make?
No negative keywords, or a neglected negative keyword list. Running broad or phrase match keywords without negatives means paying for searches that have nothing to do with your business. I’ve seen auto repair shops paying for ‘auto insurance quotes’ and law firms paying for ‘lawyer jokes.’ A properly maintained negative keyword list can reduce wasted spend by 20-40% in the first month alone. This is the single highest-impact fix in most accounts I audit.
Is using broad match keywords a mistake?
Not inherently, but broad match without Smart Bidding and without negative keywords is a wasted-spend machine. Broad match works well when paired with Target CPA or ROAS bidding because the algorithm learns to bid only on broad match queries likely to convert. With manual bidding, broad match expands into too many irrelevant searches. My default for new accounts is phrase match; I introduce broad match selectively once the account has solid conversion data.
Why do Google Ads stop converting even when clicks are still high?
Usually a landing page problem, a seasonality shift, or a conversion tracking issue — in that order of probability. First verify conversion tracking is still firing correctly. Second review your landing page for recent changes. Third look at search terms to see if the queries driving clicks have shifted. Fourth check for competitive changes — did a competitor launch a more compelling offer or better landing page that shifted intent away from clicking through to converting?
Should I let Google auto-apply optimization recommendations?
Never. Google’s auto-apply recommendations aren’t aligned with your business interests — they favor Google’s revenue. I turn off auto-apply in every account I manage and review recommendations manually and selectively. Never auto-apply keyword expansions or bidding strategy changes without reviewing the data yourself. Some recommendations are genuinely useful; many are designed to increase spend without proportionally increasing returns.
How much does poor account structure cost in wasted spend?
Poor structure inflates CPCs through low Quality Scores. An account with 500 keywords crammed into 3 ad groups has mediocre ad relevance across the board and pays 30-50% more per click than a well-structured competitor. Restructuring to tighter thematic ad groups — ideally small, tightly themed groups of 5-15 keywords — can lower CPCs by 25-40% over 60-90 days as Quality Scores improve and bidding algorithms get cleaner data.
Looking for more Google Ads strategies? Read my guide on Quality Score Explained, explore my Google Ads management services, or get in touch to talk through your account. I manage paid search for 15+ active clients across San Diego.
