Agency, in-house team or Build-Operate-Transfer? Most founders compare the monthly fee and stop there. That number hides most of the real cost, and all of the difference in what you keep. Here's a framework for comparing them properly.
Compare marketing models on five factors, not the monthly fee: full cost over three years (including switching costs), control of accounts and data, speed to a working system, risk if people or partners leave, and capability kept in your business. Agencies start fastest but keep the know-how. Building in-house from scratch gives control but is slow and risky without a leader. Build-Operate-Transfer builds an owned team on your payroll with a partner, then hands it over.
- 56% of CMOs say they lack the budget to deliver their 2026 strategy, and 54% report insufficient resources (Gartner).
- Compare models over 36 months on five factors: full cost, control, speed, risk and capability kept.
- Agency costs repeat every year; in-house and BOT costs shift to salaries and tools you'd own anyway.
- 92% of companies with in-house teams still use agencies, but for capacity and specialist skills, on their terms (ANA).
- BOT suits founders who want ownership but lack the leadership or time to build a team alone.
Why the monthly fee is the wrong comparison
Marketing budgets are tight almost everywhere. Gartner's 2026 CMO Spend Survey of 401 marketing leaders found budgets effectively flat at 7.8% of company revenue, up from 7.7% (Gartner, May 2026):
Marketing leaders under budget pressure, 2026
Under that pressure, it's tempting to pick whichever option has the smallest monthly number. But the three ways to run marketing (hire an agency, build a team from scratch, or build one with a partner through Build-Operate-Transfer) differ in something a monthly fee doesn't show: what you keep when you stop paying.
Large companies are already voting with their budgets. 39% of CMOs plan to cut agency spending (Gartner, 2025), while labour's share of marketing budgets rose from 21.9% to 24.5% in a year (Gartner, June 2026). Money is moving from rented capability to owned capability. The question for a founder is how to make that move without paying twice.
The three models at a glance
| Agency | In-house from scratch | Build-Operate-Transfer | |
|---|---|---|---|
| Who does the work? | Agency staff | Your hires | Your hires, run with a partner first |
| Speed to start | Fast | Slow: hiring, onboarding, trial and error | Medium: 4 to 6 weeks of hiring, then a 90-day pilot |
| Control | Low to medium | High | High, from day one on your payroll |
| Know-how built | Mostly in the agency | In your business, slowly | In your business, with written playbooks |
| Biggest risk | Dependency and switching cost | Wrong hires, no processes | Choosing the wrong partner |
| After year one | The same fee, every year | Salaries and tools | Salaries and tools, with no partner fee after transfer |
This is a general view. It varies by business, by partner and by how well each option is run.
The five-factor framework
1. Full cost over three years
Add up everything, not just the headline fee. The checklist below shows what to include for each model. Then add the cost of switching: rebuilding accounts, data and know-how if a partner leaves. A cheaper monthly fee that costs you your data and history when you leave isn't cheaper.
2. Control
Who owns the ad accounts, analytics, CRM, dashboards and playbooks? Can you make a change today without asking anyone? On most ad platforms, only users with the top access level can control who else has access; in Google Ads, that's the Admin level (Google Ads Help). If that isn't someone in your company, you don't fully control your marketing.
3. Speed
How quickly can the model get a working marketing system live, and how fast can it react when something changes? Agencies start fastest. Building from scratch is slowest, because a new team has to learn the business and invent its processes at the same time.
4. Risk
What happens if a key person leaves, a contract ends or results disappoint? With an agency, you lose the team and often the history. With a new in-house team, you risk hiring the wrong people with nobody to manage them. The ANA's research on in-house teams found keeping talent energised (63%) and attracting top-tier talent (44%) were the leading management concerns (ANA, 2019).
5. Capability kept
At the end of three years, what does your business know how to do that it didn't before? This is the factor that compounds. The ANA found companies running in-house agencies rank cost efficiency as the top benefit, followed by better brand knowledge, institutional knowledge and dedicated staff, and that owning first-party data is a growing driver (ANA, 2023).
The full-cost checklist
| Agency | In-house from scratch | Build-Operate-Transfer |
|---|---|---|
| Monthly retainer | Salaries and benefits | Salaries and benefits, from day one |
| Media management fees or mark-ups | Recruitment costs and time | Partner fee for audit, hiring and the 90-day pilot |
| Production and creative extras | Tools and software | Tools and software, in your accounts |
| Scope creep and change requests | Training | Training during the pilot |
| Your team's time managing the agency | Founder or leadership time managing | Leadership time during handover |
| Switching cost if you leave | Cost of mis-hires and ramp-up time | Replacement guarantee on hires in the first 60 days |
Run the numbers over 36 months, not one. Agency fees repeat every year. In-house and BOT costs shift towards salaries and tools you'd be paying anyway once you own the function. Our post on agency dependency explains what leaves with an agency when the contract ends.
Do you still need agencies?
Often, yes, but on different terms. In the ANA's 2023 study, 92% of companies with in-house agencies still work with outside agencies, mainly for extra capacity or specialist skills (ANA, 2023). The difference is who's in charge. When you own the team, accounts and data, an agency becomes a specialist you call in, not a dependency you can't leave.
Which model fits you?
- Agency if marketing is small, short-term or highly specialist, and you've secured ownership of accounts and data first. Check with our ownership audit.
- In-house from scratch if you already have an experienced marketing leader who can hire, set up processes and manage the team.
- Build-Operate-Transfer if you want to own your marketing but don't have the leadership or time to build it alone. See the four moves of BOT.
- Build-Operate-Manage if you already have a team but no senior leader to run it. See BOM explained.
Still unsure? The five questions narrow it down quickly.
A healthcare group with four clinics is weighing up its options. Its agency is the cheapest monthly line, but the ad accounts are in the agency's name, the group has two years of campaign history it can't access, and every new clinic launch is billed as extra scope.
Building from scratch looks cheaper on paper, but the group has no marketing leader to hire or manage a team. It chooses BOT: a performance marketer and a content and local-search specialist on its own payroll, a 90-day pilot to set up processes and reporting, then handover to its operations head. In year two, its costs are salaries and tools, and every account and report is in its own name.
For the big-brand evidence behind the shift, read why 82% of large advertisers now run in-house teams, and for why people still matter in the AI era, people over tools.
The cheapest option this month isn't always the cheapest over three years. Compare what you keep, not just what you pay.
How Ad Asthra helps you choose and build the right model
Whichever model you choose, the goal is the same: marketing capability that stays in your business.
Frequently asked questions
Is it cheaper to hire a marketing agency or build an in-house team?
It depends on the time frame. Agencies are often cheaper to start, but fees repeat every year and switching costs can be high. In-house costs shift to salaries and tools you'd own anyway. Compare full costs over three years, not one month.
What hidden costs should I include when comparing marketing options?
Media management fees or mark-ups, production extras, scope creep, management time, recruitment, training, tools, the cost of mis-hires and ramp-up time, and the cost of switching if a partner leaves.
What is Build-Operate-Transfer in marketing?
A model where a partner audits your needs, hires a team onto your payroll, runs it with you through a 90-day pilot, then transfers full ownership to your leadership. A typical engagement takes 3 to 6 months.
When is an agency the right choice?
When your marketing needs are small, short-term or highly specialist, and you've made sure the ad accounts, analytics and data are in your company's name.
Do companies with in-house teams still use agencies?
Yes. The ANA found 92% of companies with in-house agencies still work with outside agencies, mainly for extra capacity or specialist skills.
What's the biggest risk of building in-house from scratch?
Hiring the wrong people with nobody experienced to manage them or set up processes. Attracting and keeping good talent are the leading concerns for in-house teams in ANA research.
How does Ad Asthra help founders decide?
Our Advisory & Governance service audits your current agencies and spend; our Enablement Programs cover organisational design; and BOT or BOM build or lead the team that fits.
Sources
- Gartner 2026 CMO Spend Survey Finds CMOs Allocate 15.3% of Marketing Budgets to AI, But Only 30% Are Ready to Scale AI Capabilities, Gartner, 11 May 2026
- Gartner 2025 CMO Spend Survey Reveals Marketing Budgets Have Flatlined at 7.7% of Overall Company Revenue, Gartner, 12 May 2025
- Gartner Marketing Survey Finds Awareness and Conversion Account for 62.6% of Total Media Spend, Gartner, 8 June 2026
- In-House Agencies No Longer A Trend, They're Here To Stay: ANA Report, Association of National Advertisers (ANA), 2023
- New Study Reveals Concerns For In-House Agency Management, Association of National Advertisers (ANA), 2019
- About access levels in your Google Ads account, Google Ads Help
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