Marketing Budget for a Multi-Market Campaign
Key Takeaways
Do not compete by adding more motion, copy or effects. One recognisable idea, one dominant image and a short line are more likely to survive a busy city.
Design for the actual site, viewing distance and exposure time. A layout that looks elegant on a laptop can disappear on the street.
Use motion, live data and context only when they sharpen the idea. The technology should make the message easier to understand, not become the message.
A sensible starting point for many multi-market campaigns is to place 25% to 40% of the working media budget into OOH and 60% to 75% into digital, then adjust for the objective, geography and buying journey. It is a planning range, not a universal benchmark.
The split should answer a commercial question. OOH can create public visibility and shared familiarity across a city. Digital can capture active demand, explain the offer and optimise towards a measurable action. One Day brings both roles into one out-of-home advertising plan rather than treating the channels as competing line items.
The UK digital advertising market reached £40.5 billion in 2025. That scale gives advertisers extensive reach and targeting options, but it also creates a crowded auction. A larger digital share does not automatically mean more incremental growth.
There Is No Fixed OOH-to-Digital Ratio
Budget percentages should follow the task. A new brand entering three cities may need more OOH to become recognisable. An established retailer launching a time-limited promotion may need more search, social and display to convert existing demand.
Start by writing one job for each channel. If two channels have the same vague role, such as “build awareness”, the split will be difficult to defend. Give OOH responsibility for reach, stature, location or memory. Give digital responsibility for consideration, demand capture, lead generation or sale.
Set the Minimum Viable Weight in Each Market
OOH needs enough coverage and repetition to behave like a campaign. Audience measurement translates site schedules into reach and frequency, allowing the planner to test whether a proposed market allocation is genuinely visible or merely present.
Do not divide the OOH budget equally between ten markets if the result is ten underweight plans. It is usually stronger to concentrate activity in fewer places, learn properly, then expand. The same principle applies to digital: each market needs enough volume to support optimisation without exhausting the audience.
Build Market Tiers
A three-tier structure turns one national or international budget into a clear investment rule:
Priority markets receive the full OOH and digital mix, supported by the strongest creative and measurement.
Support markets receive a narrower OOH network or a digital-led plan where demand already exists.
Test or control markets receive limited activity so the team can estimate incremental change.
Use customer value, sales opportunity, distribution, brand awareness, media cost and operational readiness to assign the tiers. Population alone is not enough.
Marketing Budget for a Multi-Market Campaign
Protect Demand Capture
When OOH goes live, branded search, direct visits and category interest can rise. Reserve digital budget to meet that demand. Search coverage, fast landing pages, local stock information and retargeting should be ready before the first poster appears.
This does not mean digital should receive every remaining pound. Cap low-incrementality retargeting and avoid paying repeatedly for customers who were already going to buy. The digital plan should make the response easier, not claim ownership of every conversion.
Compare Outcomes, Not CPMs Alone
OOH and digital impressions are not interchangeable. A roadside contact, a six-second video view and a search click have different contexts and purposes. A low CPM can still be poor value if the media does not move the outcome that matters.
Longer effects also belong in the decision. A substantial share of advertising-generated profit can arrive after the first 13 weeks. Judging the OOH share only against last-click revenue during the posting period will systematically undervalue it.
Use One Measurement Language Across Markets
Agree common definitions for reach, frequency, exposed geography, new customer, branded search and incremental revenue. Shared OOH measurement principles make cross-market comparisons more consistent, even when local data providers and inventory systems differ.
Keep a single campaign taxonomy across site lists, ad platforms, analytics and finance. Market teams can then explain local differences without changing the definition of success.
Rebalance After a Meaningful Test
Run the opening allocation for long enough to observe delivery and response. Compare priority markets with controls or historical baselines, check distribution and creative quality, then move budget deliberately. Do not react to two days of platform volatility.
A strong conclusion might be to increase OOH in markets where familiarity is the barrier, increase search where demand is being missed or remove a market that cannot support useful weight. The purpose of the first split is to create evidence for the second.
Read more and test different scenarios with One Day's Media Mix Calculator.
How One Day Agency Can Help
One Day can size the market opportunity, model OOH reach and frequency, assign channel roles and build one budget framework across locations. The same team can plan billboards, digital media and the measurement needed to rebalance investment.
Speak to One Day Agency with your markets, total budget and commercial objective. We will show where the mix needs concentration, where digital should capture demand and which markets can provide a credible test.
“The right split is not the one that makes every market look equal. It is the one that gives each priority market enough weight to create a result you can learn from.” - Ricardo Seixas, CEO, One Day Agency
References
Route: OOH Measurement Framework
World Out of Home Organization: Audience Measurement Guidelines 2026
FAQs
Is 30% OOH and 70% digital a good starting point?
It can be a useful scenario to model, but it is not a rule. Check whether the OOH share delivers meaningful reach and whether the digital share covers demand capture, prospecting and conversion.
Should every market receive the same channel split?
No. Opportunity, brand awareness, distribution, media costs and audience behaviour vary. Use one decision framework, then allow the allocation to reflect each market.
What counts as working media?
Working media is the money spent on placements or delivery. Keep production, agency fees, research, technology and contingency visible as separate lines so the true campaign requirement is clear.
Should a small budget be spread nationally?
Usually not. A concentrated regional or city test is more likely to create useful frequency and measurable commercial change than a thin national presence.
When should we change the split?
Review after enough delivery and response data has accumulated to support a decision. Consider reach, frequency, search, traffic, sales and longer-term effects together rather than following one platform metric.
