Most Google Ads accounts are not badly built. They are badly maintained. There is a meaningful difference. The initial build might reflect sound thinking - sensible campaign structure, appropriate bidding, relevant keywords. But accounts exist inside businesses that change. Products get added. Margins shift. Sales teams report that the leads coming through are not the ones they can close. A setting chosen nine months ago sits quietly doing harm, and nobody has looked at it because the account is technically running.
This is drift. It is the default state of any account that is managed reactively rather than reviewed systematically. A proper audit is not about tearing everything down and starting fresh. It is about understanding where the account is today versus where it should be, and making deliberate decisions about the gap.
Start With the Business, Not the Dashboard
The most common audit mistake is opening Google Ads first. Before you look at a single metric, you need to understand what the account is supposed to do right now. What are the target cost per acquisition figures? Have margins changed? Are there services or product lines the business has stopped prioritising? Are there new offerings that are not yet properly represented in the account? These questions sound basic, but accounts frequently keep spending based on commercial priorities that are six months out of date.
Once you have that commercial context, everything you find in the audit has meaning. A campaign with a rising CPA is a different problem depending on whether the business margin has compressed or the landing page has changed. A keyword generating volume but poor lead quality tells a different story if the sales team has shifted upmarket. The account data only makes sense when held against current business reality.
Conversion Tracking Comes Before Everything Else
If the conversion data is wrong, every other conclusion the audit reaches is compromised. This is not a theoretical concern. In practice, accounts frequently have duplicate conversion actions firing, or they are counting micro-conversions - page visits, scroll events, video plays - alongside genuine leads, which inflates reported volume and misleads Smart Bidding. Check what is being counted as a conversion in the Google Ads interface, then verify it independently in GA4 and Google Tag Manager. The two should tell the same story.
Pay particular attention to which conversion actions are set to optimise bidding versus which are informational only. A Target CPA or Target ROAS strategy is only as good as the signal it is trained on. If Performance Max or a Smart Bidding search campaign is optimising towards form fills that include low-quality enquiries, the algorithm is doing exactly what it has been told - just not what the business actually needs. Conversion tracking is not a setup task. It is an ongoing audit item.
Also check consent mode implementation. If a significant proportion of UK users are declining consent and consent mode is not configured correctly, you are losing conversion modelling data that Smart Bidding depends on. This is a quiet degradation that shows up as unexplained performance drops rather than anything obviously broken.
Campaign Structure and Budget Allocation
Budget allocation is where commercial drift becomes most visible. Look at which campaigns are actually receiving their allocated budgets and which are consistently limited. Then ask whether the spending hierarchy reflects current priorities. It is common to find that a legacy brand campaign is consuming a disproportionate share of budget relative to the demand it is capturing, while a higher-margin service area is underfunded and constrained. Nobody made that decision - it happened through inertia.
For accounts running Performance Max alongside standard search campaigns, the structure audit needs to examine potential cannibalisation. PMax will compete for traffic that search campaigns could serve, and the query-level reporting inside PMax - while improving - still gives you less control over what you are actually matching against. Review the search themes and audience signals configured in each PMax asset group, and sense-check whether they are genuinely aligned to discrete product or service areas rather than overlapping broadly.
Look at campaign-level bid strategies and whether they are appropriate for the volume each campaign handles. Target CPA and Target ROAS require sufficient conversion data to function reliably. A campaign generating fewer than thirty conversions per month is likely to perform erratically under a target strategy. Maximise Conversions with a target set loosely may serve better in those situations. There is no universal answer, but the audit should surface mismatches between strategy and data volume.
Keywords, Match Types, and Search Term Reality
Search term behaviour shifts over time. The queries triggering your ads today are not necessarily the same as those triggering them when the campaign launched, particularly as broad match has expanded its reach and Smart Bidding has been given more latitude to find conversions across a wider range of queries. Pull the search terms report for the last ninety days and read it properly. Look for patterns - irrelevant verticals, wrong geographies, competitor brand terms you are paying for inadvertently, or informational queries that will never convert.
Negative keywords are the structural defence against wasted spend, and they decay. A negative keyword list built eighteen months ago may not cover the new ways people are searching, or the new services that have come onto the market. Cross-reference your search terms against your current negative lists and identify gaps. Shared negative lists applied at account level can create conflicts that block relevant traffic, so check those too - conflicts are easy to miss and quietly suppress volume.
Landing Pages and the Full Conversion Path
An audit that stops at the Google Ads interface is an incomplete audit. The paid click is one part of a chain, and the landing page is where a significant proportion of value is lost or created. Check that final URLs are still live and loading correctly - redirects add latency, and broken pages generate spend with zero return. Then look at whether the landing page a user arrives on genuinely matches the ad they clicked. A mismatch between ad message and landing page content damages Quality Score and, more importantly, damages conversion rate.
Beyond technical checks, look at load speed and mobile experience. The majority of paid search traffic in most sectors arrives on mobile. If the landing page experience on mobile is materially worse than desktop - slower, harder to complete a form, requiring excessive scrolling to reach a call to action - that is a measurable drag on performance that no bid adjustment will fix. Check page speed scores, look at form abandonment data in GA4 if it is instrumented, and review how leads are handled after submission. A fast landing page with a slow or broken lead response process is still a broken funnel.
Turning Audit Findings Into Prioritised Action
A good audit produces a list of findings. A useful audit produces a prioritised list with clear ownership. Not everything you find will have the same impact, and not everything will be within the paid search team's direct control. Conversion tracking issues and landing page problems often require development or analytics resource. Budget reallocation decisions may require commercial sign-off. Structure the output so that quick wins - negative keyword additions, bid strategy corrections, duplicate conversion action fixes - can be acted on immediately, while larger structural changes go through a proper change process.
Build auditing into the account management rhythm rather than treating it as an emergency response to a performance drop. Accounts that are reviewed systematically - even at a lighter touch on a monthly basis with a deeper review quarterly - accumulate far fewer compounding problems. The goal is not to catch mistakes after they have done damage. It is to keep the account aligned with the business it is supposed to serve, continuously.