How many hoardings does an outdoor campaign need?

There is no useful answer such as three, ten or twenty that fits every outdoor campaign. The right number of hoardings depends on how many separate journeys you need to cover and how often the same audience should meet your message. Start with movement, then count sites.

Define the job before counting boards

A new shop may need a tight cluster around one catchment. A property launch may need coverage on the routes from several residential and office areas to the project. A citywide brand campaign needs broader reach. These are different jobs, so they should not begin with the same site count.

Write down the audience, the action you want and the places that matter. Then group those places into real travel corridors. This turns a vague request for maximum visibility into a map that can be planned.

Give every site a role

A useful plan normally combines roles rather than repeating similar sites:

• A hero site creates a strong first impression at a recognisable junction.
• Route sites repeat the message during regular journeys.
• A destination site appears near the store, project, clinic or event.

If two proposed hoardings reach almost the same traffic from the same angle, the second may add frequency but little new reach. That can be valuable, but it should be an intentional choice.

Use a minimum viable route

For each priority corridor, shortlist the few sites that cover its entry, decision point and destination. If the budget cannot support every corridor properly, remove the least important corridor instead of placing one isolated board everywhere. A focused campaign is easier to notice and easier to measure.

Compare plans, not individual bargains

Build two or three options at the same indicative budget. One can favour reach across more areas. Another can favour frequency on fewer routes. Compare the audience fit, viewing conditions, campaign length and complete production cost. Do not choose the plan with the largest raw traffic total unless the traffic matches the audience you need.

Reach and frequency are standard OOH planning ideas, but estimates are planning inputs rather than exact headcounts. The final site count should come from the business brief and the route pattern. Read why one hoarding is rarely a complete campaign, then use route search for a commuter campaign and build the full outdoor budget.

Sources: Geopath glossary of OOH reach and frequency; OAAA planning guide for OOH media.