Which Google Ads bid strategy should a service business use?
Pick the one your data can support. Maximize Conversions when you trust lead counts and want a fixed budget spent. Target CPA once the conversion definition is clean enough that a lead means roughly the same thing everywhere. Target ROAS only when real revenue values flow back per conversion. Asking for a return target while sending invented conversion values is optimizing a number you made up.
What each strategy is solving for
Maximize Conversions spends the budget and tries to get the most events. It has no opinion about efficiency beyond that, which makes it well suited to a budget-constrained account where you simply want the money used well.
Target CPA holds an average cost per event and will leave budget unspent if it cannot hit the target. Target ROAS holds a ratio of conversion value to cost, which requires values that vary and that mean something. Each one is strictly more demanding of your data than the one before it.
There is one more consideration that outranks all of them: whichever strategy you pick, it inherits your conversion definition. A perfect bid strategy pointed at a bad conversion event will lose to a crude strategy pointed at a good one. Choose the strategy last, after the measurement is settled.
The conversion value problem in service businesses
Retailers know the order value at the moment of conversion. You do not. The lead arrives Tuesday, the technician runs the call Thursday, the invoice closes Friday, and the real value of that lead is only knowable days later.
Assigning a flat value to every lead does not solve this — it just tells the system every lead is identical, which is the same as having no values. The workable middle path is derived values: an expected value per lead based on service line, source and history, refined as real outcomes come back. Building that loop is a data integration problem, not a Google Ads setting.
A sane progression
- Start: Maximize Conversions with a clean single primary conversion and a firm budget.
- Next: Target CPA once you have consistent weekly conversion volume and have removed duplicate and junk events.
- Then: Maximize Conversion Value once real or derived job values are flowing back.
- Only then: Target ROAS, and only where volume supports it.
Two mechanics people get wrong
A target is an average, not a cap. Target CPA does not mean no lead will cost more than the target; it means the system aims for that average across the campaign. Individual conversions above it are expected behavior, not a malfunction.
And target changes are not free. Large moves push the campaign back into learning and volatility follows. Move targets in modest increments and let each change settle before judging it. If you find yourself changing targets weekly, the underlying problem is usually measurement, and it shows up clearly once campaign data sits next to booked work.
Topics: bid strategy · target CPA · target ROAS · smart bidding
Have a version of this question about your own business?
The useful answer usually depends on which systems you run and how they're connected. That's a conversation, not a blog post.