What is a Facebook lookalike audience?
A plain English guide for local business owners who want their ads to stop guessing and start targeting people who actually buy.
6 min read
Find more people exactly like your best customers, automatically.
Running ads without a lookalike audience is like handing out flyers in the street. You reach a lot of people, but most of them don't care.
When you use a lookalike audience, you stop guessing. You tell Facebook exactly what a good customer looks like, and it goes out and finds more of them. It's the most effective targeting tool local businesses have.
In this article:
What a lookalike audience actually is
A lookalike audience is exactly what it sounds like. It is a group of people who look and act like your current customers.
Instead of you trying to guess which age group, interests, or postcodes to target, you give Facebook a list of people who have already bought from you. Facebook analyses that list. It looks at what those people have in common.
Then, it creates a brand new audience of people who share those exact same traits, but haven't bought from you yet.
How Facebook builds one from your existing customer data
It starts with a source audience. This is the data you provide.
You upload a list of your past customers. Names, email addresses, phone numbers. Facebook matches that data to its users.
Once it finds your customers, its algorithm goes to work. It looks at thousands of data points. What pages they like. What ads they click. Where they live. What they buy. It identifies the hidden patterns that connect your best customers.
Finally, it finds new people who match those patterns and puts them into a new audience for you to target with your ads.
Why this matters specifically for local service businesses
Local businesses often waste money targeting everyone in a 20-mile radius. Just because someone lives nearby doesn't mean they need a new boiler, a kitchen extension, or legal advice.
A lookalike audience fixes this. It filters out the noise.
If your best customers are homeowners aged 40-55 who value quality over the cheapest price, Facebook figures that out. It puts your ads in front of other people just like them in your local area. You stop paying for clicks from people who will never book you.
This is why Facebook and Meta Ads management relies so heavily on good data. Better data means better targeting. Better targeting means cheaper, higher-quality leads.
Common mistakes local businesses make with lookalike audiences
Setting this up wrong costs money. Here is where most businesses fail.
The source list is too small. Facebook needs at least 100 people to build a lookalike audience. But 100 isn't enough for good results. You want a list of at least 1,000 past customers for the algorithm to find accurate patterns.
The list is full of bad data. If you upload a list of people who asked for a quote but never bought, Facebook will find you more time-wasters. You must use a list of actual paying customers. Your best ones, if possible.
The audience is too broad. You can set a lookalike audience to be 1% to 10% of the population. A 1% audience is small but highly accurate. A 10% audience is massive but less accurate. Local businesses should always stick to 1%.
If you want to make sure your foundation is solid before running ads, read our quick SEO tips to ensure your organic presence backs up your paid marketing.
How Chrisp Design sets this up as part of Meta ads management
We don't just hit the boost button. We build a proper system.
We take your clean customer data and build a 1% lookalike audience restricted strictly to your service area. We create ads that speak directly to the problems those specific people have.
When they click, they don't just get a generic form. They enter a system that captures their details and follows up instantly. The ad finds the right person. The system secures the job.
"If you upload a list of people who asked for a quote but never bought, Facebook will find you more time-wasters. You must use a list of actual paying customers."
Key takeaways
- A lookalike audience finds new people who share the exact traits and behaviours of your existing customers
- Always use a source list of your best paying customers, not just random leads or website visitors
- Keep your lookalike audience set to 1% to ensure the highest accuracy for your local area
- Good targeting only works if you have a system in place to instantly follow up with the leads you generate
Common questions about lookalike audiences
How much does a Facebook lookalike audience cost to set up?
Creating the audience itself is free within your Facebook Ads Manager. You only pay for the ads you run targeting that audience, just like any other campaign.
How big should my source audience be?
Facebook requires a minimum of 100 people from a single country to create a lookalike audience. However, a list of 1,000 to 5,000 high-quality customers produces much better, more accurate results.
Can I use a lookalike audience with a small customer list?
Yes, as long as you have at least 100 people. But if your list is too small, the data isn't strong enough for Facebook to find clear patterns. If you don't have enough past customers, you can build a source audience from people who have engaged with your Facebook page or watched your videos instead.
Shaun Chrisp
Founder, Chrisp Design
Shaun has spent over a decade helping local businesses grow with smarter marketing systems. Chrisp Design builds websites, AI systems and automation for businesses across the UK.