How Much Should Google Ads Cost? A Realistic UK Budget Breakdown

The honest answer nobody gives you

Every agency will tell you "it depends." And they're right — but that's not helpful when you're trying to figure out whether you can actually afford Google Ads.

So here's a real breakdown based on what we've seen managing millions in ad spend across UK businesses.

The Minimum You Should Spend

If you're spending less than £500/month on Google Ads, you probably shouldn't be running them at all. That's not gatekeeping — it's maths.

At £500/month with an average cost per click of £2, you're getting around 250 clicks. If 4% of those convert into enquiries, that's 10 leads. If you close 20% of those, that's 2 customers. If each customer is worth less than £250 to you, you're losing money.

The minimum viable budget for most UK small businesses is £500–£1,000/month. Below that, you don't get enough data to optimise and you don't generate enough leads to justify the time spent managing it.

What Clicks Actually Cost in the UK

Cost per click varies wildly by industry. Here's what we typically see:

• Tradespeople (plumbers, electricians): £1–£4 per click
• Legal services: £3–£10 per click
• Financial services: £5–£15 per click
• E-commerce: £0.30–£2 per click
• B2B services: £2–£8 per click
• Home improvement: £1–£5 per click
• Healthcare/dental: £2–£8 per click

The more competitive and high-value the service, the more expensive the click.

The Number That Actually Matters: Cost Per Lead

Forget cost per click. The number you should obsess over is cost per lead (or cost per enquiry).

A £5 click that converts into a £10,000 kitchen installation is a bargain. A £0.50 click that never converts is a waste.

Typical cost per lead by industry:

• Tradespeople: £15–£50
• Professional services: £30–£80
• E-commerce: £5–£25
• B2B: £40–£120

If your cost per lead is higher than these ranges, something is wrong with your campaigns, your landing page, or both.

The Hidden Costs Nobody Mentions

The ad spend is only part of the picture. You also need to factor in:

Management time: If you're doing it yourself, that's 3–5 hours per week minimum to do it properly. What's your time worth?

Landing pages: If you're sending traffic to your homepage, you're wasting money. You may need dedicated landing pages built (£500–£2,000 each, or included if you hire an agency).

Tracking setup: Google Ads without proper conversion tracking is like driving with your eyes closed. Budget £200–£500 for a proper GA4 and conversion tracking setup if you don't have one.

How to Know If It's Working

You should know within 2–4 weeks whether your campaigns have potential. Not whether they're profitable yet — but whether the fundamentals are right.

After week 1: Are you getting impressions and clicks? Are the search terms relevant?

After week 2: Are any keywords clearly wasting money? Cut them. Are any converting? Double down.

After month 1: What's your cost per lead? Is it in the right ballpark for your industry? If not, something needs to change.

After month 3: This is when you should be profitable. If you're not seeing a positive return by month 3, either the campaigns need serious work or Google Ads isn't the right channel for your business.

The Biggest Mistake: Spending Money Without Tracking

We've lost count of the number of businesses we've audited who are spending £1,000+ per month on Google Ads with zero conversion tracking. They genuinely have no idea whether it's working.

Fix this first. Before you spend another pound. If you can't tell which keywords and ads are generating actual enquiries, you're guessing. And guessing with real money is expensive.

Start With an Audit, Not a Budget

Before you decide how much to spend, find out where you stand. A proper audit will tell you whether your current setup is working, what's being wasted, and what the realistic opportunity looks like.

That way you're making decisions based on data, not hope.