How Remarketing Works in Google Ads: A Practical Guide

What Is Remarketing (and Why Does It Work)?

Remarketing — also called retargeting — lets you show ads to people who have already visited your website. Instead of reaching cold audiences who've never heard of you, you're reconnecting with people who showed enough interest to click through to your site but didn't take action.

Think about your own browsing habits. You visit a website, look at a product or service, get distracted, and leave. Later, you see an ad for that exact business while reading the news or watching YouTube. That's remarketing at work.

It works because most people don't convert on their first visit. Research consistently shows that website visitors typically need 3-5 interactions with a brand before making a decision. This is partly why your website needs strong trust signals to convert on that first visit. Remarketing keeps your business visible during that decision-making process.

Display Remarketing vs Search Remarketing

Google Ads offers two main types of remarketing, and they work quite differently.

Display Remarketing

Your ads appear as banners, images, or text ads across Google's Display Network — which includes millions of websites, apps, YouTube, and Gmail.

Aspect	Details
Where ads appear	Websites, apps, YouTube, Gmail
Ad format	Image banners, responsive display ads, text
Reach	Very broad — the Display Network reaches 90%+ of internet users
Cost	Typically £0.50-2.00 per click (much cheaper than Search)
Best for	Brand awareness, staying visible, visual businesses

Example: A kitchen fitter in Bristol creates a display remarketing campaign. Someone visits their website, browses the gallery, but doesn't make contact. Over the next 30 days, that person sees the kitchen fitter's banner ads while reading BBC News, checking weather apps, and watching YouTube videos. When they're ready to get quotes, the kitchen fitter is top of mind.

Search Remarketing (RLSA)

Remarketing Lists for Search Ads (RLSA) lets you adjust your search ads for people who have previously visited your website. When a past visitor searches for your keywords on Google, you can bid more aggressively or show them different ads.

Aspect	Details
Where ads appear	Google search results
Ad format	Standard text search ads
Reach	Only when past visitors search for your keywords
Cost	Similar to regular search, but often higher ROI
Best for	Capturing high-intent returning visitors

Example: An accountant in Leeds runs search ads for "small business accountant Leeds." Using RLSA, they bid 30% higher when the searcher has previously visited their website. This ensures they're more likely to win the top position for people already familiar with their firm.

Which Should You Use?

Situation	Recommended Type
You want broad visibility and brand recall	Display remarketing
You're in a competitive search market	RLSA (Search remarketing)
You have visual products/services	Display remarketing
Your sales cycle is long (weeks or months)	Display remarketing
You have a modest budget and want high ROI	RLSA
You want maximum coverage	Both

Setting Up Remarketing Audiences

Step 1: Install the Google Ads Tag

The Google Ads remarketing tag (also called the "Google tag") needs to be on every page of your website. It collects anonymous visitor data that builds your remarketing audiences.

You can install it:

Directly in your website code — paste the tag in the <head> section of every page
Through Google Tag Manager — add a Google Ads Remarketing tag in GTM (recommended for easier management)
Through a CMS plugin — WordPress plugins like "Site Kit by Google" can handle this

Step 2: Create Your Audiences

In Google Ads, go to Tools > Audience Manager > Your data segments to create audiences. Start with these:

All website visitors (last 30 days) The broadest audience. Everyone who visited any page on your site in the past 30 days.

Visited key service pages (last 60 days) People who viewed specific high-intent pages (your service pages, pricing page, or contact page) but didn't convert.

Started but didn't complete a form (last 14 days) People who visited your contact or quote page but didn't submit the form. These are highly qualified — they were interested enough to start the process.

Past converters (exclude or target separately) People who already submitted a form or called. Exclude them from lead generation remarketing to avoid wasting money, or create a separate campaign for upselling or repeat business.

Step 3: Set Audience Duration

The membership duration is how long someone stays in your audience after visiting your site. Choose based on your typical sales cycle:

Business Type	Recommended Duration
Emergency services (locksmiths, plumbers)	7-14 days
Home improvement (kitchens, bathrooms)	30-60 days
Professional services (accountants, solicitors)	60-90 days
High-value purchases (property, luxury goods)	90-180 days

Minimum Audience Sizes

Google requires minimum audience sizes before remarketing can run:

Display remarketing: 100 active users in the audience
Search remarketing (RLSA): 1,000 active users in the audience

If your website doesn't get enough traffic to build these audiences, focus on growing your traffic first through standard search campaigns and organic efforts.

GDPR and UK Privacy Considerations

Remarketing involves tracking user behaviour, which means you need to comply with UK GDPR and the Privacy and Electronic Communications Regulations (PECR).

What You Must Do

Cookie consent: You need a cookie consent banner that allows visitors to opt in or out of marketing cookies before any remarketing tags fire. This isn't optional — it's a legal requirement.

Privacy policy: Your privacy policy must explain:

That you use remarketing/retargeting
What data is collected (anonymised browsing behaviour)
How visitors can opt out
That Google may show them ads based on their visit

Consent management: Use a consent management platform (CMP) like Cookiebot, OneTrust, or CookieYes to handle consent properly. Configure your remarketing tags to only fire after consent is given.

What This Means in Practice

Some visitors will decline cookies, which means they won't be added to your remarketing audiences. This reduces your audience size but keeps you compliant. Non-compliance risks significant fines from the ICO, so cutting corners isn't worth it.

Remarketing Best Practices

Frequency Capping

Nobody likes seeing the same ad 50 times in a week. Set frequency caps to limit how often each person sees your display ads.

Recommended: 3-5 impressions per person per day, or 15-20 per week. More than this creates annoyance rather than awareness.

Exclude Converters

Once someone has submitted a form or called you, stop showing them lead generation remarketing ads. Either exclude past converters entirely or create a separate campaign with different messaging (e.g., "Thank you for your enquiry" or cross-selling related services).

Tailor Your Messaging

Remarketing ads should acknowledge that the person has already visited your site. Generic ads feel irrelevant. Instead:

Reference what they looked at: "Still thinking about a new kitchen?"
Address objections: "Not sure about the cost? Get a free, no-obligation quote"
Create urgency: "We've got availability this month — book your consultation"
Offer something extra: "Download our free guide to choosing the right accountant"

Use Strong Creative

For display remarketing, your ads need to stand out visually. Invest in clean, professional banner designs that:

Feature your brand clearly (logo, colours)
Include a single, compelling message
Have a clear call to action
Are designed in multiple sizes (responsive display ads handle this automatically)

Segment Your Audiences

Don't treat all past visitors the same. Someone who viewed your pricing page is much closer to converting than someone who bounced from your homepage. Create separate campaigns for different audiences with tailored messaging and bids.

Audience Segment	Bid Adjustment	Messaging Focus
Visited homepage only	Base bid	Awareness, introduce your USP
Viewed service pages	+25%	Specific service benefits
Visited contact/quote page	+50%	Overcome objections, strong CTA
Returning visitors (2+ visits)	+40%	Social proof, trust signals

Common Remarketing Mistakes

Remarketing everyone equally: Not all visitors are equal. Segment and prioritise based on intent signals.

No frequency cap: Bombarding people with ads damages your brand perception.

Generic creative: "Visit our website!" is not a remarketing message. Tailor it to the audience.

Ignoring GDPR: Non-compliant remarketing can result in fines and reputational damage.

Not excluding converters: Showing lead generation ads to existing customers wastes budget and looks unprofessional.

Setting it and forgetting it: Review your remarketing performance monthly. Refresh creative every 4-6 weeks to prevent ad fatigue.

Is Remarketing Right for Your Business?

Remarketing works best when:

Your website gets at least 500-1,000 visitors per month
Your sales cycle is longer than a single visit
Your service is considered carefully before purchase
You have a clear conversion action on your website

If your website traffic is still low, focus on building it through standard Google Ads campaigns first. Once you have consistent traffic, remarketing becomes a powerful way to convert more of those visitors into customers.

Get Your Remarketing Strategy Right

Remarketing can significantly improve your Google Ads ROI — but only when set up properly with the right audiences, messaging, and compliance measures. Request a free SwiftLead audit and we'll review your current remarketing setup (or help you plan one from scratch), check your GDPR compliance, and recommend the strategy that fits your business and budget.

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