Calculate repair-job contribution before setting a lead-cost target

A low inquiry cost can hide an unprofitable repair job. The shop still needs parts, technician time, payment handling and enough contribution to support the business. Before setting an advertising target, calculate what an additional completed job contributes under the assumptions relevant to that decision.

The useful question is how much acquisition cost the shop can afford for the kind of work it expects to receive. A lead-cost target should follow from that calculation and the observed inquiry-to-job rate. It should not be copied from a benchmark for an unrelated service.

Define the cost scope

Start with the revenue from a completed job, excluding amounts the business does not retain. Subtract the variable costs attributable to that job, such as parts, outsourced work, payment fees and incremental labor where appropriate.

State how labor is treated. A shop with unused salaried capacity may evaluate a short-term marginal decision differently from one that needs extra paid technician hours. Neither view should be silently presented as total company profit.

Keep fixed overhead, tax, financing and the owner's required return visible in the broader business decision. The advertising calculation is a planning tool, not a complete accounting assessment.

A hypothetical job calculation

Imagine a repair sells for $220. In this hypothetical example, parts cost $70, incremental labor is $60, and payment plus other variable costs are $10. The job contributes $80 before advertising and the remaining business costs.

If the owner needs $40 of that contribution left after acquisition, the maximum advertising acquisition allowance is $40 per completed job. That limit is based on the owner's assumption, not an industry standard or a promised return.

Now assume one in four qualified inquiries becomes a completed paid job. A $40 acquisition allowance spread across four inquiries gives a $10 maximum advertising cost per qualified inquiry.

If the completion rate falls to one in eight, the corresponding inquiry allowance is $5. Keeping the $10 target despite the weaker completion rate would consume twice the intended acquisition allowance.

Separate raw inquiries from qualified inquiries

The calculation depends on which stage provides the denominator. If only half of raw inquiries meet the shop's approved service criteria, a qualified-inquiry allowance is not interchangeable with a raw-form allowance.

Google's About qualified leads and converted leads distinguishes qualified and converted outcomes. Define those stages consistently before applying the arithmetic.

Review duplicate inquiries, unsupported services, uncontactable requests and open cases. Do not force recent unresolved inquiries into the lost column merely to finish a weekly report.

Our HighLevel Agency Conversion Tracking: From Lead Count to Revenue provides broader context for this stage separation.

Account for job mix and rework

A shop may have profitable diagnosis work and low-contribution component replacements in the same campaign. Average revenue alone can hide that mix. Review meaningful job categories without creating more segmentation than the data supports.

Also include a defensible allowance for refunds, warranty work or other repeat costs where records justify it. Do not invent a universal failure percentage. If the evidence is incomplete, show a range and name the uncertainty.

For example, an $80 contribution estimate might become $65 after the owner includes an observed average rework allowance. Recalculate the acquisition limit rather than continuing to advertise using the original attractive figure.

Build a small sensitivity worksheet

Create three scenarios: cautious, current evidence and optimistic. Vary the job contribution and qualified-inquiry completion rate. Keep the required retained contribution explicit in every scenario.

Use separate cards on mobile:

• Contribution before advertising.
• Contribution the owner needs to retain.
• Acquisition allowance per completed job.
• Qualified inquiries needed per completed job.
• Resulting inquiry-cost allowance.

Add the observation period, sample size and open-inquiry count. A calculation based on five jobs has a different uncertainty from one based on a consistent mature cohort.

Keep value measurement honest

Google's About conversion values supports representing business value rather than relying only on event counts. Any value sent to the account should match the chosen business definition and verified measurement setup.

Do not label gross revenue as profit. Do not count both a deposit and the full job payment as separate complete job revenue unless the accounting and event design explicitly reconcile them.

The Count Every vs One: How Conversions Get Tallied helps review repeated actions. Validate the business records first, then inspect what the account receives.

Use the limit as a decision aid

A cost above the calculated allowance does not automatically justify pausing the campaign. Check measurement, conversion delay, open jobs and whether the job mix has changed. The underlying assumptions may need repair.

Likewise, a cost below the allowance does not prove the campaign caused every job. Attribution assigns credit under a method; causal lift requires separate evidence.

The How Much Should a Small Business Spend on Google Ads? can help connect the unit economics with spending decisions. Increasing a budget should be justified by contribution, service capacity and uncertainty, not only by a low reported CPA.

Bring the worksheet into the account review

Choose one meaningful question, such as whether search terms are attracting a lower-contribution service mix or whether suitable inquiries are failing to reach diagnosis. Review that question using real account evidence and technician-approved service facts.

Explore current AdvisorPPC plans and use the calculation to explain the outcome you want. The target is a transparent business decision whose assumptions can be inspected and updated.