How Much Should You Spend on Google Ads? A Local Business Guide
The Wrong Way to Set an Ad Budget
Most small businesses set their ad budget in one of two ways. They either pick a number that feels comfortable, typically what they spent last year plus or minus a small percentage, or they copy what they think their competitors are spending based on what they see online.
Both approaches are backward.
A comfortable number is not a strategy. It is a guess that happens to feel safe. And matching a competitor’s spend without knowing their margins, their conversion rates, or their goals tells you nothing useful about what you should be spending. Budget should be derived from your revenue goals, not from a sense of what feels right or what competitors might be doing.
Start With the Outcome, Work Backward
Here is how to think about it properly: Start with a revenue goal.
Example Calculation
- 1.Revenue Goal: Generate $30,000 in new revenue this quarter from paid ads.
- 2.Customer Value: Average new client/patient spends $1,500. You need 20 new customers.
- 3.Close Rate: You close 1 in 4 leads. You need 80 leads to get 20 customers.
- 4.Ad Spend: At an industry benchmark of $50 per lead, you need roughly $4,000 in ad spend to generate 80 leads.
That is your starting budget estimate. Not $500 because it feels safe. Not $10,000 because your competitor seems to be spending a lot. $4,000 because the math says that is what your goal requires. If $4,000 is more than you can afford right now, you have two options: reduce the revenue goal or improve your close rate so you need fewer leads to hit the same number of customers.
The Minimum Threshold Problem
Here is something most agencies will not tell you directly: paid advertising has a minimum effective threshold. Below a certain budget, most campaigns simply cannot generate enough data to optimize.
Google’s algorithm needs conversion data to improve your targeting. If your monthly budget is too low, the platform does not have enough to work with. You end up paying for traffic that never produces useful learning.
If your budget is below these thresholds, concentrate everything in a narrower geographic area where your budget goes further, or invest in organic growth strategies like SEO until you have the budget to run paid ads properly. Running a $300 monthly Google Ads campaign and wondering why it is not producing results is not a paid ads problem. It is a budget problem.
How to Allocate Budget Across Channels
Once you know how much to spend on Google Ads in total, the next question is where the rest of the budget goes. Google, Meta, something else?
For most local service businesses and medical practices starting out, we recommend a simple rule: start with the channel that captures existing demand first. That is almost always Google Search. People searching for a plumber, a dentist, or a roofing contractor are already motivated. They have a problem, and they are looking for a solution. Your ad showing up at that moment is high-value.
Pro Tip: Strategic Allocation
Once your search campaigns are generating reliable leads at a predictable cost, add Meta or display advertising to build awareness at the top of the funnel. A rough starting allocation for a local service business with a $3,000 budget might be $2,200 on Google Search and $800 on Meta retargeting.
What the Data Says About Return on Ad Spend
Average ROAS (Return on Ad Spend) benchmarks vary widely by industry, but some numbers are worth knowing as reference points.
- •Home Services: For roofing, HVAC, and plumbing, a well-run Google Ads campaign should produce a ROAS of 3x to 5x in a competitive market.
- •Medical Practices: Performance depends on the procedure and patient value. A general dentist might target a $60 to $90 cost per new patient lead, while cosmetic surgery can support a much higher cost per lead due to high lifetime patient value.
Knowing your acceptable cost per lead, and therefore your acceptable ad spend per new customer, is the foundation of any rational budget decision.
When to Increase
The clearest signal to increase ad spend is a consistent positive ROAS. If you're generating $4 for every $1 spent, the question is why you aren't spending more. Increases should be incremental (20% to 30% every four to six weeks) so the algorithm can recalibrate. Additionally, ensure your team has the capacity to handle new leads before increasing the budget.
When to Pause or Cut
Budget cuts make sense when the cost per lead is consistently above your acceptable threshold or during periods when your business cannot handle new customers (e.g. staff shortages). What does not make sense is cutting the budget after two or three weeks because you haven't seen results yet. Paid campaigns require four to eight weeks to mature.
The Bottom Line
The right Google Ads budget is the one that your revenue goals require, that your margins can support, and that meets the minimum threshold for the platform to optimize effectively.
Start with the goal. Work backward to the budget. If you are unsure what your numbers should look like, a proper pre-campaign model will tell you exactly what you need.