Seven patterns of waste we keep finding in Google Ads accounts
After auditing dozens of UK Google Ads accounts, the same seven leaks come up again and again. Specific patterns, what they look like in your data, and how to plug them — with or without an agency.
Most Google Ads accounts aren’t broken. They’re leaking. The campaigns run, the conversions log, the dashboard turns green at the end of the month — and somewhere quietly, twenty to forty percent of the budget goes to clicks that never had a chance.
We run a free 30-minute audit before we agree to manage anyone’s account, and after enough of them, the leaks start to rhyme. These are the seven we see most often, in roughly the order they cost you money.
1. Conversion tracking that’s silently lying
The single most common finding, and the most expensive. Symptoms: GA4 conversions don’t match Google Ads conversions, “Form submit” fires on page load instead of on submit, GCLID isn’t being captured into your CRM, offline conversions aren’t being uploaded back. The bidding algorithm is then optimising for something — just not the thing you’d like.
Quick check: in your Ads account, open Tools → Conversions and look at the Status column. Anything that says “No recent conversions,” “Inactive,” or “Receiving conversions, but…” is a flag. Then open Tag Assistant on a live page and submit a test form. If the conversion tag fires before your submit, it’s broken.
2. Performance Max eating Search
PMax is excellent at one thing: claiming credit for clicks that other channels would have got anyway. Branded queries, returning visitors, customers already on their way. We see PMax campaigns reporting CPAs of £8 while the underlying Search campaigns silently lose volume — because PMax is intercepting the same clicks earlier in the funnel.
Quick check: pull a 90-day comparison of branded search impressions before and after PMax launched. If branded Search impressions dropped while PMax impressions rose, PMax is most likely cannibalising. The fix is brand exclusions on PMax — counter-intuitively, this often raises total revenue because Search picks the volume back up at lower CPC.
3. Branded search ads paying for traffic you’d get anyway
Roughly a third of accounts we audit are spending five-figure sums on their own brand name. The argument goes: “competitors bid on us, we have to defend.” Sometimes true. Often not.
Quick check: pause branded for two weeks and watch organic clicks for the same query. If organic backfills 80%+ of the lost paid clicks, you were paying for traffic you’d already won. If it doesn’t backfill, you do have a defence problem — but you can usually run a much smaller, cheaper branded campaign focused only on competitor-incursion days.
4. Broad match without negatives, on a Smart Bidding strategy
Broad match plus Smart Bidding is Google’s recommended setup, and it can work — but only if your negative keyword list and search-term hygiene are tight. They almost never are. We see search-term reports full of irrelevant queries (job seekers, students, tyre-kickers) eating ten to twenty percent of monthly spend.
Quick check: open Insights → Search terms and sort by cost descending. Anything with zero conversions and a meaningful spend should either be a negative or shouldn’t have triggered. Add the obvious offenders to a shared negative list and watch CPA settle.
5. Quality Score below 6 on your top-spend keywords
Quality Score affects how much you pay per click. Below 6 on a high-spend keyword, you’re paying a 30–50% premium on every impression versus a competitor with a 9. The fix is usually not “better bids” — it’s landing page relevance and ad-group structure.
Quick check: in Keywords → Columns, add Quality Score, Landing page experience, Ad relevance and Expected CTR. Sort by cost. If your most expensive keyword has “Below average” on landing page experience, that’s the bottleneck.
6. Audience signals being ignored or misused on PMax
Audience signals on PMax are suggestions to the algorithm, not hard targeting. We see accounts feed PMax a single audience signal of “all website visitors” and assume it’s targeting them. It isn’t — it’s using them as a hint and then targeting whoever the algorithm thinks looks similar.
Quick check: in PMax → Asset groups → Audience signals, you should see custom segments built from search terms, customer-list match, in-market segments and your CRM data. Three or four well-defined signals beat one big one. If a campaign has just “Website visitors” or “Customer list,” it’s underfeeding the model.
7. No remarketing list segmentation
Most accounts have a single 540-day “all visitors” remarketing list and call it done. Visitors who bounced off the homepage in eight seconds and visitors who hit the pricing page three times are getting served the same ad.
Quick check: in GA4 → Configure → Audiences, look for behavioural splits — page-depth, time-on-site, specific page visits, intent signals. You want at least three: cold (homepage bounces), warm (multi-page), hot (pricing/contact viewers). Each gets a different message and bid.
What this adds up to
A reasonably typical account we audit: £8,000 monthly spend, ~25% wasted. That’s a £24k/year leak before we change a single creative. Plugging two or three of the leaks above usually moves CPA 20–40% within four to six weeks — without raising budget.
We don’t quote on management retainers without doing this audit first, because half the time the right answer isn’t “hire us.” It’s “fix conversion tracking, exclude brand on PMax, and come back in three months.”
If you want the same checks run on your account, we offer a free 30-minute Google Ads waste audit — written punch list within 48 hours, no pitch deck, no obligation. About a third end with “you don’t need us right now,” and that’s fine.