How to audit out of home advertising site quality before you buy

What to take away

An out of home advertising site audit covers consent, physical specification, audience evidence, measurement method and contract terms.
Planning consent is the first filter. A site without valid advertisement consent is a liability, not a bargain.
Site packs should give photos, dimensions, illumination, sightline data and a dated audience figure with a named methodology.
Price per thousand impressions against at least two comparable formats before you sign.
Put a verification clause in the contract so you can inspect the site and exit if the specification changes.

Read the consent position first

Everything else depends on the site being lawful. Advertisement consent in England sits under the Control of Advertisements Regulations 2007.

Ask the media owner for the consent reference, the decision date and any conditions attached. Conditions often limit hours, brightness or the length of a display.

GOV.UK publishes a plain guide to outdoor advertisements and signs. Read it before you argue about anything else.

A site can be cheap, well lit and badly positioned at the same time. Consent tells you if it may exist. Nothing else tells you if it works.

Walk the site or check who did

The sales deck shows the best angle on the best day. The audit needs the real one.

Check panel height, mounting, frame condition and surface. A damaged frame shows up in every photograph taken of the panel.

Stand at the nearest stop line, crossing and bus shelter. Note what blocks the view at peak times: trees, scaffolding, stopped buses, parked vans.

Check illumination at the hour your campaign runs. A backlit panel that is dim at 21:00 wastes evening impressions.

OOH site quality checklist

Use this before you accept a quotation.

Consent reference, decision date and conditions recorded.
Photographs from three approach angles, dated within 90 days.
Panel dimensions, orientation and illumination confirmed in writing.
Sightline distance and obstruction list for morning and evening peaks.
Audience figure with methodology, sample period and provider name.
Cleaning, downtime and maintenance terms stated in the contract.

Example: auditing a roadside six-sheet

A buyer is offered a six-sheet on a busy A road for twelve weeks. The sequence is short.

Auditing a roadside six-sheet

Pull the consent record and confirm the panel is authorised at that size and position.
Photograph the approach from 100 metres, 50 metres and the junction, at 08:00 and 17:30.
Time how long the panel is fully visible from a car at the speed limit.
Compare the quoted audience figure with traffic counts and a second measurement source.
Ask what happens if the frame fails or roadworks cover the site.

Test the audience evidence

Most site packs quote a reach figure from a route or eye tracking model. That is fine if the method is named.

Ask for the sample period, the update frequency and whether the figure covers a whole day or a peak window. A single average hides the gap between 08:00 and 20:00.

Where a site sells programmatic inventory, audience data moves through a supply chain. Data protection rules still apply to any personal data in that chain.

Compare the format with the audience

A roadside panel buys scale and frequency. A gym screen buys attention in a closed room with a known audience.

Neither is automatically better. The audit question is whether the site reaches the people you need when they can act.

If your audience skews to fitness and leisure, test a smaller network first. A separate guide on gym screen advertising explains what a trial costs and how to judge it.

Check who will run the audit

Site verification takes time and a named owner. Teams that skip it find the gap after the first invoice.

A skills forecast for out of home advertising in England is a planning input, not a slogan. It helps you set dated assumptions about who checks consent and who signs off the buy.

Build that capacity into the plan. Use the out of home advertising skills forecast before budget sign-off.

Common questions

How long does a site audit take?

Two to three days for one site once documents arrive. A network of 40 sites takes two to three weeks.

What should a media owner supply?

Consent reference, dated photographs, dimensions, illumination details, audience methodology, rate card and maintenance terms. Ask for all of it in writing.

Can I verify a site after the campaign starts?

Yes. Post campaign checks catch panel swaps, blocked sightlines and dark illumination. Put the right in the contract.

Do I need a lawyer for consent checks?

Not always. The planning authority online register answers most questions for standard formats. Take advice on large or unusual structures.