Audience research
Part of Before you trust a podcast audience number, read the research rules
Podcast advertising target audience explained for planners
How to define a podcast advertising target audience in England, using survey design, ICO-compliant data handling and CAP Code checks before you brief a buy.
What to take away
A podcast advertising target audience is the group of listeners a campaign is bought to reach, defined by evidence rather than assumption.
- Define it by listening behaviour and buying role, not age band alone.
- Build it from survey data a client can audit.
- Check data protection duties before collecting or matching listener data.
- Check ad claims against the CAP Code before sign-off.
- Keep it short enough to brief a publisher on one page.
Start with the buying decision, not the demographic
Most weak briefs open with an age band. A stronger brief opens with the decision the listener is about to make. Two people in one age bracket may need different messages.
Write one sentence naming the behaviour you want to influence, such as booking short-haul work flights twice a quarter. That gives a publisher something to match against its own audience data.
Then add the commercial qualifier. Does the listener control the budget, influence it, or only hear the content? Podcast buys often reach influencers rather than signatories.
Turn the definition into survey questions
A target audience is only useful if it can be measured. Convert your sentence into three or four closed questions with fixed answer options. Avoid open text fields, which are hard to code and compare.
Survey question checklist
- Listening frequency
- Shows heard in last month
- Action taken after an ad
- Purchase authority
- Keep set under two minutes
For help with platform and weighting decisions, see the guide to podcast advertising survey tools in England for UK fieldwork considerations.
Handle listener data within the rules
Any survey collecting names, email addresses or device identifiers creates a data protection obligation. Under the UK GDPR you need a lawful basis for processing, a retention period, and a route for people to exercise their rights.
UK GDPR data duties
- Lawful basis for processing
- Retention period set
- Route to exercise rights
- Document customer-list matching purpose
- Check if explicit consent needed
The ICO guidance on the UK GDPR sets out those duties for UK organisations. Read it before fieldwork starts, not after. Check the ICO's data protection fee checker to see whether the controller must pay the fee; some organisations are exempt.
Matching survey respondents to a client's customer list is processing in its own right. Document the purpose and check whether you need explicit consent rather than relying on legitimate interests.
Check the ad before you finalise the audience
Audience definition and creative approval are linked. If the audience includes under-18s or a sensitive category such as debt or health, the claims you can make change.
Podcast ads are non-broadcast advertising, so the CAP Code rules for non-broadcast advertising apply. For under-18s, check Section 5; for health-related products and claims, Section 12; and for financial products, including relevant debt products, Section 14. Check the relevant section before you agree a script with a host-read presenter.
Record the reasoning in the campaign file. Keep the evidenced audience definition and dated creative check together so you can explain the basis for your decisions if challenged.
Vet the advertiser and the agency
Before you share audience data with a buyer, confirm who you are dealing with. Companies House maintains the public register of companies under the Companies Act 2006.
A brief from an unverified intermediary leaves you exposed if audience data is later misused.
Run the same check on any agency holding the survey responses, and note the legal entity and filing history in your campaign record.
Compare audience definition methods
The table below sets out the common ways planners define a podcast audience in England, with the trade-offs for each.
| Method or source | What it can tell you | Trade-off to note |
|---|---|---|
| Survey research | Whether listeners meet the behavioural and buying-role criteria in your definition. | Results depend on the questions, sample and any weighting; document the method rather than treating responses as a census. |
| Publisher first-party audience data | How a publisher describes the listeners available in its own inventory. | Definitions and available detail can differ between publishers, so check what each measure represents. |
| RAJAR/MIDAS | UK evidence on on-demand audio listening, including podcasts, for market context. | It does not by itself describe the audience for a particular publisher's campaign. |
| IPA TouchPoints and Ofcom media-use research | Cross-media planning context from IPA TouchPoints and wider UK media-use context from Ofcom. | These sources can inform the brief, but are not substitutes for publisher-specific campaign data. |
| Campaign response or client data | Whether the campaign audience took an action recorded by the client. | A response does not by itself prove the podcast caused the action; any matching or use of personal data must meet data-protection duties. |
Audience definition methods
Method
- Broad demographic band
- Age, gender
- Platform listening data
- Reach, completion
- Panel survey
- Attitudes, intent
- First-party customer match
- Buyer behaviour
- Host-read attribution code
- Response by show
Measures
- Broad demographic band
- Low
- Platform listening data
- Low-medium
- Panel survey
- Medium
- First-party customer match
- High
- Host-read attribution code
- Medium
Cost
- Broad demographic band
- Weak purchase link
- Platform listening data
- Platform users only
- Panel survey
- Sample skew
- First-party customer match
- Consent, clean data
- Host-read attribution code
- Under-reports offline
Main limit
- Broad demographic band
- Platform listening data
- Panel survey
- First-party customer match
- Host-read attribution code
Use at least two methods. A demographic band alone will not survive scrutiny, and platform data alone cannot explain why a listener acted.
Write the one-page definition
Close with a one-page statement of the audience, the evidence behind it, the questions used, and the last review date.
Set a review date. Listening habits shift with commuting patterns and platform changes, so a definition built in one quarter may not hold next year.
For the wider research sequence around this step, see the Podcast advertising audience research guide for England, which shows how targeting fits with sizing, pricing and reporting.
Common questions
How many people do I need in a survey to define a target audience?
There is no single number. The sample must reflect the listening population you are buying against, and you should report the weighting method.
Can I use client customer data to build a podcast audience?
Yes, if you have a lawful basis and customers have been told how their data will be used. Matching a customer list to respondents needs to be covered by your privacy notice.
Does the CAP Code apply to host-read podcast ads?
Yes. Host-read spots are non-broadcast ads, so the CAP Code applies to the claims made. A presenter's personal endorsement does not remove that duty.
How often should the audience definition be reviewed?
Review it at least once a year, and sooner if the campaign changes platform or product line.
