If you've ever asked a marketing agency, "How much should we spend on Google Ads?" you've probably heard the least satisfying answer in marketing:
It depends.
Unfortunately, that's also the correct answer.
A remodeling company selling $100,000 whole-home renovations shouldn't determine its advertising budget the same way a contractor selling $5,000 projects does.
The better question is:
How much can you profitably afford to spend to acquire a new remodeling customer?
Once you know that number, your Google Ads budget becomes much easier to calculate.
Start With the Value of a New Remodeling Project
Imagine your average project is worth $75,000.
Your gross profit margin is 35%.
That means an average project generates approximately:
$75,000 × 35% = $26,250 gross profit
Now suppose you're willing to invest 10% of that gross profit to acquire the customer.
Your target customer acquisition cost would be:
$26,250 × 10% = $2,625
That gives you a much more useful advertising benchmark than choosing an arbitrary monthly budget.
Work Backward From Your Close Rate
Now we need to determine what you can afford to pay for a qualified lead.
Suppose your company closes:
1 out of every 5 qualified opportunities.
That's a 20% close rate.
If you're willing to spend $2,625 to acquire one new customer, your theoretical maximum acquisition cost per qualified opportunity would be:
$2,625 ÷ 5 = $525
But here's where contractors need to be careful.
Not every website inquiry becomes a qualified sales opportunity.
Some people:
- Have unrealistic budgets
- Live outside your service area
- Want services you don't provide
- Aren't ready to start
- Are simply price shopping
- Never answer the phone
That's why measuring only "cost per lead" can be misleading.
Track Cost Per Qualified Lead
Suppose Google Ads generates 20 inquiries at $150 each.
Your advertising spend was:
20 × $150 = $3,000
At first glance, your cost per lead is $150.
Sounds pretty good.
But suppose only eight of those inquiries were legitimate opportunities.
Your actual cost per qualified lead is:
$3,000 ÷ 8 = $375
And if you close two $75,000 projects?
You've generated:
$150,000 in contracted revenue from $3,000 in advertising spend.
That's a much more meaningful measurement of performance.
So What Should Your Monthly Google Ads Budget Be?
Instead of starting with an arbitrary number, work backward from your revenue target.
Let's say you want Google Ads to generate two additional projects per month.
If your close rate is 20%, you may need approximately 10 qualified sales opportunities to produce those two projects.
If your target cost per qualified opportunity is $400:
10 × $400 = $4,000
A reasonable starting media budget would therefore be around $4,000 per month, assuming your market has enough search volume to support it.
The exact number will vary substantially by location, competition, project type, website conversion rate, campaign quality, and sales performance.
Bigger Budgets Don't Fix Bad Campaigns
This is one of the most expensive mistakes we see.
A contractor isn't generating enough leads, so the solution becomes:
"Let's increase the budget."
Not necessarily.
If your campaign has poor targeting, weak keywords, bad conversion tracking, or an ineffective landing page, increasing the budget simply allows Google to waste your money faster.
Before scaling spend, determine:
- Which searches generate qualified leads?
- Which campaigns generate actual appointments?
- Which leads turn into estimates?
- Which estimates become contracts?
- How much revenue is associated with those contracts?
Only then should you aggressively scale the campaigns producing profitable customers.
Don't Let Google Ads Operate in a Vacuum
Your advertising campaign is only one part of the customer acquisition system.
Google Ads might generate the click.
Your landing page has to convert it.
Your intake process has to qualify it.
Your sales team has to close it.
And your tracking system has to connect the resulting project back to the original marketing source.
If any part of that chain breaks, Google Ads may appear less profitable than it actually is—or much more profitable than it really is.
The Metric That Ultimately Matters
Clicks don't pay your bills.
Leads don't pay them either.
Profitable projects do.
Your Google Ads strategy should ultimately answer one question:
How much profitable revenue are we generating for every dollar invested in customer acquisition?
Once you can answer that reliably, marketing becomes much less mysterious.
It becomes math.
Want to Know What You Can Afford to Pay for a Remodeling Lead?
Web Bull Marketing helps remodeling contractors and design-build firms build measurable lead-generation systems based on actual business economics—not vanity metrics.
Calculate your numbers, identify where your pipeline is leaking revenue, and determine how aggressively you can afford to grow.
[Calculate Your Lead Economics →]
Related Reading
- How Much Should a Remodeling Lead Cost?
- How to Calculate Your True Close Rate
- How to Calculate Your Google Ads ROI
- How to Qualify Remodeling Leads Without Losing the Good Ones
