10 Google Ads Mistakes Costing Small Businesses

Google Ads is the fastest way to get your business in front of customers who are actively searching for what you sell. It is also the fastest way to burn through cash if you do not know what you are doing. After managing campaigns for plumbers, chiropractors, bathhouses, flooring companies, and dozens of other Australian small businesses, I have seen the same mistakes repeat across nearly every account I audit. The worst part? Most of these are settings that Google enables by default, and they are designed to make Google money, not yours.

This article covers the 10 most expensive mistakes I see in Australian small business Google Ads accounts. If you are running ads right now, there is a good chance at least three of these apply to you. Each one includes the fix, and most take less than 15 minutes.

1. Running Broad Match Keywords Without Negative Keywords

This is the single biggest waste of money in Google Ads for small businesses. Broad match keywords tell Google to show your ad for anything Google considers "related" to your keyword. If you bid on "plumber Brisbane", broad match might show your ad for "plumber salary Brisbane", "plumber apprenticeship", "DIY plumbing tips", or "plumber" in Sydney. You pay for every click, regardless of whether the person is actually looking to hire a plumber in your area.

When we took over Aqua First Plumbing's Google Ads account, a large portion of their ad spend was going to irrelevant search terms. Searches for plumbing courses, plumbing jobs, and plumbing supplies were eating their budget. They had broad match keywords and zero negative keywords. We added a thorough negative keyword list in the first week and their cost per lead dropped significantly without changing anything else.

2. Sending All Traffic to Your Homepage

Your homepage is not a landing page. It is a general introduction to your business with multiple navigation options, multiple messages, and multiple distractions. When someone searches for "emergency plumber Brisbane" and clicks your ad, they want to know three things: Can you help me? Are you available now? How do I contact you? If they land on your homepage and have to navigate to find that information, you lose them.

Every ad group should point to a dedicated landing page (or at minimum, the most relevant service page) that matches the search intent exactly. An ad for "blocked drain repair" should land on a page about blocked drain repair, with a clear headline, your phone number above the fold, a call-to-action button, and proof that you are the right choice (reviews, photos, response time).

A common mistake we see is sending all ad traffic to a general homepage. For local wellness and service businesses, we always recommend dedicated landing pages for each offering, whether that is a specific treatment, a package, or a service tier. The conversion rate difference between a homepage and a targeted landing page is consistently significant. Same ad spend, meaningfully more enquiries.

3. Ignoring Search Term Reports

The Search Terms Report shows you the actual queries that triggered your ads. It is the most valuable report in Google Ads and the one most small business owners never look at. You should be checking it weekly, at minimum fortnightly, and using it to do two things: add irrelevant terms as negative keywords, and discover new high-performing terms to add as keywords.

I audit Google Ads accounts regularly where the business owner has not checked their Search Terms Report in months (or ever). Every single time, at least 15 to 25% of the spend is going to completely irrelevant searches. That is $150 to $750 per month on a $3,000 budget, going straight in the bin.

4. Set-and-Forget Campaigns

Google Ads is not a billboard you put up and walk away from. The market changes, competitors adjust their bids, seasonal demand shifts, and Google's algorithm evolves. A campaign that performed well three months ago might be wasting money today. I see this constantly: someone set up their ads in 2024, they worked well for a while, and now the business owner assumes they are still working because the ads are still running. They have not checked in months.

If you do not have time for this, you should either simplify your campaigns (fewer keywords, fewer ad groups) or hire someone to manage them. Running ads without monitoring them is worse than not running ads at all, because at least when you are not advertising, you are not losing money.

5. Wrong Conversion Tracking (or None at All)

If you do not have conversion tracking set up correctly, you are flying blind. You have no idea which keywords, ads, or campaigns are actually generating customers, so you cannot optimise. You are essentially throwing money at Google and hoping something sticks.

Here is what should be tracked as a conversion for most small businesses: phone calls (from ads and from your website), form submissions, online bookings, quote requests, and email clicks. Google makes it easy to set up call tracking and form tracking, there is no excuse for not having it configured.

6. Using Google's Default Campaign Settings

When you create a new campaign in Google Ads, the default settings are optimised for Google's revenue, not yours. Google recommends broad match keywords, enables search partners and display network by default, sets automated bidding strategies that maximise clicks (not conversions), and turns on ad suggestions that auto-apply after 14 days. Every one of these defaults costs you money.

7. Targeting Too Broad a Geographic Area

If your plumbing business services the northern suburbs of Brisbane, your ads should not be showing to people in the Gold Coast, Ipswich, or the Sunshine Coast. Yet I regularly see local service businesses targeting "Brisbane" as a single radius, which includes areas they do not service and would never drive to.

Tight geographic targeting does two things: it eliminates wasted clicks from people outside your service area, and it makes your budget go further within the areas that matter. For Recycle King Australia, a skip bin and waste removal business servicing Brisbane and Sydney, we narrowed their targeting from broad regions to their actual service suburbs. Their cost per lead dropped significantly, simply because every click was now from someone they could actually service.

8. Writing Generic Ad Copy

"Quality service at affordable prices. Call us today!" This ad copy tells the customer nothing. It could be for any business in any industry in any country. Your ad copy needs to answer the question: why should I click on your ad instead of the three others above and below it?

9. Not Using Ad Extensions (Now Called Assets)

Ad extensions (Google renamed them "assets" in 2023, but everyone still calls them extensions) are free additional information that appears below your ad, phone numbers, additional links, location, callouts, structured snippets, and more. They make your ad larger on the page, provide more information, and improve your Quality Score. There is no reason not to use every relevant extension.

Ads with extensions have a 10 to 15% higher click-through rate than ads without them. Since click-through rate directly affects your Quality Score, which affects how much you pay per click, extensions literally save you money while getting more clicks. It takes 20 minutes to set up all of them.

10. Not Knowing Your Numbers

The most expensive Google Ads mistake is not knowing whether it is working. If you cannot answer the following questions, you are gambling, not marketing: What is my average cost per click? What is my cost per lead? What is my cost per customer? What is my customer lifetime value? What is my return on ad spend?

Here is the maths that matters. The average cost per click in Australia is $2 to $4 on Search (higher for competitive industries like legal, insurance, and finance). If your conversion rate is 5%, you need 20 clicks to get one lead, costing you $40 to $80. If 1 in 3 leads becomes a customer, your cost per customer is $120 to $240. If that customer is worth $500+ to your business, the maths works. If the customer is worth $50, it does not. This calculation should drive every decision you make in Google Ads.

The 15-Minute Audit You Should Do Right Now

If you fix just these five things, you will likely see a 20 to 40% improvement in your results within the first month. I have seen it happen in account after account. The businesses wasting the most money are not the ones with bad products or services, they are the ones with good businesses running badly configured ads.

Frequently Asked Questions

How much should a small business spend on Google Ads in Australia? For most local service businesses, $1,000 to $3,000 per month is a realistic starting budget on Search. Below $500/month, your data accumulates too slowly to optimise effectively. Above $3,000/month, you should be working with a professional or have very strong internal expertise. The right budget depends on your industry, competition, and customer value.

Should I use Smart Campaigns or set up campaigns manually? Avoid Smart Campaigns. They are Google's simplified campaign type that removes most of your control, you cannot see search terms, you cannot add negative keywords, and targeting is largely automated. They are designed for maximum simplicity, but that simplicity costs you money. Set up a standard Search campaign with manual control. It takes an extra hour to set up and saves you thousands over time.

Is Google Ads worth it for a small business with a limited budget? Yes, but only if you manage it properly. A well-managed $1,000/month campaign will outperform a poorly managed $5,000/month campaign every time. The key is tight targeting, relevant keywords, proper conversion tracking, and regular optimisation. If you cannot commit to managing it properly, either learn how (our Google Ads Accelerator course covers everything) or hire someone who will.

How long before I see results from Google Ads? Unlike SEO, Google Ads can drive traffic from day one. However, it takes 2 to 4 weeks of data before you can start optimising effectively, and 2 to 3 months before a campaign is truly dialled in. Expect to lose some money in the first month while you learn what works, budget for it and treat it as an investment in data.