Google Ads for lead generation: why ecommerce tactics fall flat

The mechanics look the same. You bid on searches, you write ads, you pay per click. But the moment someone fills in a form instead of buying a product, almost everything downstream changes: what you measure, what you feed Google, and what good actually looks like.

You are optimising for a promise, not a sale

In ecommerce, a conversion is money in the bank. Google sees the revenue, learns from it, and chases more of the same. In lead gen, a conversion is a form fill or a phone call, which is a promise of possible revenue, not the thing itself. A lead worth £5,000 and a tyre-kicker who will never buy look identical to Google unless you tell it otherwise.

That single difference is why lead-gen accounts go wrong. The algorithm optimises for whatever you call a conversion. Count every form fill equally and you train Google to find you more form fills, including all the rubbish ones.

Conversion tracking has to carry lead quality

This is the part most accounts get wrong, and it is the foundation of everything else. For lead gen, your tracking needs to do more than count submissions:

• Feed lead quality back to Google. Pass offline conversions from your CRM so the algorithm learns which clicks became real customers, not just enquiries.
• Value your leads. A booked consultation is worth more than a brochure download. Give them different values so Google chases the valuable ones.
• Track calls properly. Service businesses live on the phone. If your call tracking is missing, you are blind to half your leads.

Get this right and Smart Bidding starts working for you, steering spend towards the enquiries that turn into invoices. Get it wrong and you are optimising for noise.

Cost per lead is the number that matters, with a catch

In ecommerce you watch ROAS. In lead gen you watch cost per lead, but the catch is that the figure on its own is a trap. A £15 lead that never closes is dearer than a £90 lead that becomes a £6,000 client. The number that actually matters is cost per acquired customer, and you only see that if your tracking ties leads back to closed business.

We have written separately on what a good cost per lead looks like and why chasing cheap leads usually backfires.

Campaign structure leans on Search, not Shopping

There is no product feed, so Shopping and the feed-heavy side of Performance Max do not apply. Lead gen lives on Search: tightly themed campaigns, exact and phrase keywords for the high-intent terms, and a negative keyword list that works hard to keep the careers-seekers, the DIY crowd and the freebie-hunters out. Broad match has its place, but only once your conversion data is clean enough to guide it.

Local matters too. Most service businesses serve an area, so geo-targeting, location-based bid sense and ad copy that names the patch all pull their weight. We have written up the specifics for trades, dental and clinics, and law firms.

The landing page does half the work

In ecommerce the product page does the converting. In lead gen, the landing page is the whole job. The click is only worth paying for if the page turns it into an enquiry: one clear offer, a form that asks for as little as it can get away with, a phone number that is easy to find, and proof you are worth calling. Send paid lead-gen traffic to a generic homepage and you will pay for clicks that bounce.

The short version

Lead gen rewards a different discipline to ecommerce. Track quality not just volume, feed Google your real outcomes, build tight Search campaigns with ruthless negatives, and treat the landing page as part of the campaign, not an afterthought. Do that and a lead-gen account becomes the most predictable growth lever a service business has. If you want to know whether yours is set up for quality or just churning out form fills, that is what the Free Audit is for.