Eight criteria for an out of home advertising product comparison

What to take away

• Most teams start with the rate card, then let price bend every other judgement. Fix criteria and weights before you see a sales deck.
• Compare formats, not just suppliers: audience delivery, position quality, production cost, compliance risk and contract terms.
• Treat supplier numbers as claims until the method is named. The reviews and comparison methods pillar explains how to test them.
• Score every format on the same scale and record where each score came from.
• Run the same test on the agency side, because the party placing the budget shapes availability and reporting.

Fix the criteria before the quotes

The common mistake is starting with the rate card. Once a number is on the table, every other criterion bends towards it. Decide what the buy has to achieve, then write the criteria down.

A workable set covers audience delivery and how it is measured, format and position quality, and availability and lead times. Add production and installation, compliance risk, contract flexibility, and total cost across the flight.

Give each criterion a weight that reflects the objective. A brand launch and a retail footfall push will not weight the same things. Set the weights before supplier meetings so the arithmetic cannot be adjusted later.

Compare formats, not just suppliers

A product comparison in this sector usually means comparing formats: 48-sheet and 96-sheet billboards, six-sheet panels, digital roadside screens, transport formats and retail media screens. Each carries a different production burden and planning cycle.

Retail environments are a distinct case because audience context is tied to shopping behaviour. The Office for National Statistics publishes retail industry statistics that help frame how retail media sits alongside other channels.

For each format, record what the supplier includes and what sits outside the price. Installation, vinyl, digital copy changes and late cancellation are the usual gaps. A cheap panel with expensive production is not cheap.

Score on evidence, not impression

Build a simple table: criterion, weight, score out of five, evidence, source. If a supplier cannot say how an audience figure was produced, score the evidence rather than the figure.

Ask whether the measurement method matches your decision. Reach figures suit a coverage decision. Attention or sales-lift studies suit a response decision. Mixing the two produces false precision.

Where a supplier cites a research report, ask for the page. General strategy context, such as the articles and reports published by CIM, frames a brief but is no substitute for campaign-specific delivery data.

Compliance and copy risk

Out of home copy is public, fixed for its flight and subject to the advertising codes. A claim that passes online can fail on a roadside panel because of legibility, substantiation or placement.

Use the Copy Advice service run by the ASA and CAP to check creative before publication. Build the turnaround into the schedule and score formats on how easily copy can be amended mid-flight.

If a format cannot carry a compliant version within the production window, that is a scoring outcome, not a creative problem to solve later.

Weigh the agency side too

The format comparison is only half the buy. The party placing the budget affects availability, pricing and reporting quality. Teams shortlisting partners should read out of home advertising agency reviews in England first, because review coverage varies by region and specialism.

Score agencies on the same criteria as formats: evidence quality, reporting, contract terms and how they handle a mid-campaign change. A strong format bought through a weak intermediary still underdelivers.

Glossary

• Panel: a single advertising face or screen.
• Flight: the period a campaign runs.
• Copy: the creative artwork supplied for display.
• Production: printing, building or uploading the creative.
• Weight: the importance you assign to a criterion.

Common questions

How many formats should a comparison cover?

Three to five is usually enough to expose the trade-offs between cost, audience and production burden. More than that and scoring becomes noise.

Should price carry the heaviest weight?

Only if the objective is pure cost efficiency. For most campaigns, total cost across the flight, including production and copy changes, matters more than the headline rate.

What evidence counts as strong?

Named methodology, a stated sample or measurement period, and a source you can open. Anything else is a claim, and should be scored as one.

Can one comparison serve every campaign?

No. Weights should change with the objective. Keep the criteria fixed and adjust the weighting so results stay comparable.