Estimate what a suitable enquiry can cost your business

Define the enquiry denominator

Choose the type of request you are costing: all form submissions, suitable enquiries or assessed opportunities. A suitable enquiry has a service and location fit, while a raw form submission may not. Use the same definition in the booking-rate calculation and cost report.

Keep duplicate, spam, pending and unknown records identifiable. Removing awkward records without a stated rule makes the resulting cost look more favorable and harder to reproduce.

Estimate contribution per completed job

Start with selling revenue and subtract the costs your model assigns to delivering the job. Identify whether the calculation includes overhead and owner time. Set aside the amount you need to retain for other costs and your intended return.

The remainder is a planning acquisition allowance, not guaranteed profit. Collection timing, cancellations and additional expenses may change what the business actually retains.

Connect the allowance to booking probability

Multiply the per-job acquisition allowance by the fraction of comparable suitable enquiries that become completed jobs. If one in four becomes a job, each suitable enquiry carries one-quarter of that allowance on average.

Use a consistent time period and enough decision follow-up to identify completed outcomes. A young set of pending quotes can make the rate look low simply because customers have not decided yet.

Include handling costs deliberately

If reviewing and responding to an enquiry consumes meaningful time or expense, decide where that cost sits. It may already be included in overhead or need a separate allowance. Avoid subtracting the same cost twice.

Label a media-spend ceiling separately from an all-in acquisition ceiling. A campaign that meets the media target may still be expensive after preparation, management and response work.

Run conservative and optimistic scenarios

Calculate the ceiling using more than one booking rate and delivery contribution. Identify which uncertain input drives the largest change. This helps you choose what to measure next instead of treating a single spreadsheet answer as a fact.

Avoid building the ceiling around speculative repeat purchases. Include repeat value only when there is relevant observed evidence and the extra delivery costs are understood.

Compare with actual acquisition evidence

At review, calculate actual spend per suitable enquiry and per completed customer using the same definitions. Keep revenue, contribution and cash collected distinct. Check whether the sample is large or mature enough to support a decision.

Use the estimate as a guardrail for a small test. If the result exceeds it, inspect service fit, handling cost and the buying path before assuming that changing bids or reducing prices solves the problem.

Illustrative enquiry ceiling calculation

A hypothetical completed job contributes $200 on the chosen cost base. The owner wants to retain $140, leaving $60 for acquisition. At a 25% suitable-enquiry-to-completed-job assumption, the all-in allowance is $60 × 0.25 = $15 per suitable enquiry.

If handling costs $3 per request and is not already counted, the illustrative media allowance is $12. At a 10% booking assumption, it falls to $3 after handling. These scenarios show sensitivity; they are not a forecast, a recommended bid or a complete accounting model.

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