Google Ads Budget Guide

Your Google Ads budget should start from the job you want to win, not from a round number. Work backwards through average job value, close rate, cost per click and conversion rate, and the budget calculates itself.

This guide is only about the Google Ads line. For how that line fits alongside SEO, retention and everything else, see how much a local business should spend on marketing.

The single most common budget mistake is not overspending. It is spreading a small budget so thinly that no campaign ever gathers enough data to improve.

Start From the Job, Not the Budget

You need four numbers: what a job is worth, how often you close a lead, what a click costs in your area, and what share of clicks become leads. Those four give you a defensible budget.

• Average job value. Gross, not revenue for the year.
• Close rate. Of the leads that reach you, how many book?
• Cost per click. Varies enormously by trade and city.
• Landing page conversion rate. What share of clicks become a call or form.

From those, cost per lead is cost per click divided by conversion rate, and cost per booked job is cost per lead divided by close rate.

A Worked Example

The maths is simple once the numbers are on paper, and it usually settles the argument about whether the channel is affordable.

Change any one input and the answer moves. Lift conversion rate from 8% to 12% and the same 1,720 pounds buys 15 jobs instead of 10. That is why the landing page usually deserves attention before the budget does.

The Minimum Viable Budget

Below a certain point a campaign cannot learn. If the daily budget does not buy several clicks a day, you get noise rather than data, and no basis for deciding anything.

As a rough floor, aim for a monthly budget that buys at least 15 to 20 clicks a day in your area, and enough leads per month to judge quality. In an expensive trade that floor is higher than most owners expect.

• Too small: spend spread over many keywords, a handful of clicks, no conclusions.
• Workable: one or two services, tight geography, enough clicks to see patterns weekly.
• If the floor is unaffordable, narrow the service and area rather than thinning the spend.

Splitting Budget Across Services and Areas

Split by profit, not fairness. The service with the best margin and the highest close rate should get the budget until it stops absorbing it profitably.

• Give emergency work its own budget, because it converts differently and costs more per click.
• Do not split evenly across suburbs. Fund the ones that actually book.
• Keep a small test budget, perhaps 10 to 15%, for a second service or area.
• Review the split monthly, because seasonality moves it more than most trades expect.

When to Increase the Budget

Increase when the campaign is limited by budget rather than by demand, and when the cost per booked job still leaves an acceptable margin. Not before.

• Impression share lost to budget is high, meaning you are missing searches you could win.
• Cost per booked job has been stable for several weeks.
• You have the capacity to service more work without hurting response time.
• Raise in steps of roughly 20 to 30% so the campaign can adjust without resetting performance.

When the Budget Is Genuinely Small

A small budget is not a reason to avoid the channel. It is a reason to be far narrower than feels comfortable.

• Advertise one service, not five.
• Restrict to the smallest area that still has demand.
• Run only during hours you answer the phone.
• Use exact match on the highest intent terms only.
• Consider Local Services Ads first, since you pay per lead rather than per click.

Key Takeaways

A budget is an output of your numbers, not an input you guess.

• Work backwards from job value, close rate, cost per click and conversion rate.
• Improving the landing page is often cheaper than increasing the budget.
• Below a minimum, a campaign produces noise rather than data.
• Increase only when limited by budget and when cost per job is stable.