Best Online Advertising Platforms for Small Businesses

The short version: Google Ads wins for anyone selling something people already search for, Meta wins for anyone selling something people need to be shown, and most small businesses waste money because they pick the platform their mate uses rather than the one that matches how customers buy. Budget matters less than matching intent to platform.

I've watched small business owners pour £500 a month into Facebook ads for a service nobody searches for socially, then wonder why it's not converting. The platform wasn't wrong for everyone. It was wrong for them. So let's go through the actual options, what they cost, and who should use what.

Google Ads: the one with intent built in

Google Ads is still the best platform for capturing people who already know they want something and are typing it into a search bar. That's the whole advantage: intent. Nobody searches "plumber near me emergency" for fun.

Cost per click varies wildly by industry. Home services in the UK typically run £1.50 to £4 per click. Legal and financial terms can hit £15 to £40 per click in competitive cities. A local bakery might pay 30p a click. Before you touch the platform, check Google's Keyword Planner to see what your terms cost, because that number decides whether this is viable at your budget.

Worked example: say you run a small HVAC repair business in Leeds with a £400 monthly ad budget. At an average £2.50 per click and a realistic 4% conversion rate on a well-built landing page, that's 160 clicks and roughly 6 to 7 leads a month. If your average job is worth £180, you need maybe 2 to convert into paying customers to break even on ad spend alone. That's the maths you should be doing before launch, not after.

Meta (Facebook and Instagram): good for showing, not telling

Meta ads work when people don't know they want your product yet. Visual, impulse-driven, lifestyle purchases do well here: clothing, home decor, coaching programmes, food brands. It's weaker for anything with long consideration cycles or where people actively search, like insurance or B2B software.

Average cost per click on Meta sits around £0.40 to £1.20 depending on audience and niche, which looks cheap next to Google, but the conversion rate is usually lower because you're interrupting rather than answering a need. If you're running Facebook lead ads, the lead capture and follow-up system matters as much as the ad itself, which is why pairing it with the right setup, covered in this guide to CRMs for Facebook lead ads, often fixes "bad ad performance" that was a bad follow-up problem.

If writing and designing the creative is the bottleneck, there are now decent AI tools that generate ad variations fast; I've compared several in this roundup of AI ad generators for small business ads.

LinkedIn Ads: expensive, but right for one specific job

LinkedIn Ads are the most expensive click on this list, often £5 to £12 per click, sometimes higher for sponsored InMail or finance and tech audiences. Most small businesses have no business being here. But if you sell B2B services with a high lifetime value, consultancy, recruitment, software, professional coaching, it's often the only platform where you can target by job title, company size and industry with real precision. One closed deal from a £3,000 contract can pay for months of modest spend.

The uncomfortable truth nobody tells small business owners: if your average sale is under £200, LinkedIn Ads will bleed you dry. Don't use it because it feels professional. Use it because your numbers support the cost per click.

Pinterest Ads: the quiet performer for visual, planning-stage purchases

Pinterest gets overlooked because it's not seen as a serious advertising platform, which is a mistake for the right business. People use Pinterest to plan, not to scroll mindlessly, which means purchase intent is higher than people assume for home, wedding, food, fashion and craft businesses. I've written in detail about why Pinterest works for advertising and when it doesn't, but the short version is: if your product photographs well and solves a "someday" project, it's worth testing with even £100.

TikTok Ads: cheap reach, short attention, needs volume

TikTok Ads can deliver very low cost per click, sometimes under £0.30, but the format demands constant fresh creative because ad fatigue sets in within days, not weeks. This suits businesses that can realistically produce new short video content weekly. If you can't commit to that volume, your cost per click will climb fast as the same three ads get stale.

Microsoft (Bing) Ads: the one everyone skips and shouldn't

Bing still handles a meaningful slice of UK search traffic, and because almost nobody advertises there, cost per click is often 30 to 50% cheaper than the equivalent Google term. Users skew slightly older and more likely to be on work desktops, which suits B2B services and higher-ticket purchases. It's not a replacement for Google Ads, it's a cheap add-on once Google is already working.

How to choose (step by step)

• Step 1: Work out whether your customer searches for you (plumbers, solicitors, repairs) or needs to be shown you (fashion, home decor, coaching). Searched-for goes to Google or Bing. Shown-to goes to Meta, Pinterest or TikTok.
• Step 2: Check real cost per click for your terms in Google's Keyword Planner before committing a budget.
• Step 3: Work out your break-even number of sales needed to cover the spend, using your actual average order value.
• Step 4: Start with one platform and £300 to £500 for a genuine four-week test, not three days.
• Step 5: Only add a second platform once the first one is converting predictably.

Most small businesses skip straight to step 4 and wonder why nothing works. The maths in steps 1 to 3 is the part that determines success.

The landing page problem nobody wants to hear

I'll say the uncomfortable bit plainly: the advertising platform is rarely the reason a campaign fails. A weak landing page, a form with nine fields, a site that loads in six seconds on mobile, that's what kills conversion far more often than the wrong platform choice. If your website is the weak link, it's worth fixing that before spending another pound on ads; this comparison of free website builders for small businesses is a sensible place to start if budget is tight. And if your brand looks generic once someone lands on it, no amount of ad spend fixes that; these branding ideas for local recognition are worth an afternoon before your next campaign.

Where an AI consultant earns their fee here

If you've tried two platforms and neither has worked, the problem usually isn't the platform, it's targeting, tracking or creative, and that's where outside eyes help. An AI consultant for small businesses can audit your pixel setup, your audience data and your ad copy in a few hours, which often reveals the actual leak faster than another month of guessing.

Frequently asked questions

What is the cheapest online advertising platform for small businesses?

TikTok and Pinterest usually offer the lowest cost per click, often under £1, but cheap clicks only matter if they convert, so check your conversion rate before assuming cheap means cost-effective.

Should a small business use Google Ads or Facebook Ads first?

Use Google Ads first if customers actively search for what you sell, and use Facebook or Instagram first if your product is visual and people need to see it to want it; most businesses only need one to start.

How much should a small business spend on online ads per month?

£300 to £500 for a genuine four-week test is enough to tell whether a platform works, provided you've already checked average cost per click for your industry beforehand.

Is LinkedIn Ads worth it for a small business?

Only if your average sale value is high enough to absorb a £5 to £12 cost per click, which generally means B2B services, consultancy or software rather than low-ticket products.