In-house vs. Agency · Choosing Between Insourcing and Outsourcing Marketing
In-house Marketing vs Agency Outsourcing
What is in-house vs. agency?
- Keep the judgment in-house, outsource the execution
- Keep accounts, source files, and data in the company's name
- An in-house team means roles, tools, and training, not one hire
Once you start splitting work between in-house and agency by function, the first thing that changes is the question. The total-cost comparison of 'Is the agency expensive, or is hiring cheaper?' becomes which functions must stay inside and which can be bought from outside. Understanding of customers and products, messaging and positioning, coordination with sales, and data and performance management are functions that leave the company with nothing if they go outside. You can hand an agency the execution, but not the judgment.
There are four criteria. The first is frequency: work that repeats every week is cheaper in-house, while a trade show booth or a video produced once a quarter is cheaper through an agency. The second is depth of expertise: in fast-changing fields such as search advertising or video editing, agencies are often ahead. The third is the weight of customer and product knowledge: content you can only write by knowing your product deeply, such as technical proposals and case studies, is where agencies consistently fall short. The fourth is speed and control: materials sales needs tomorrow have to come from inside. Don't compare only payroll against agency fees. Include the time of the in-house person who manages the agency, and the accounts, data, and know-how that disappear when you switch agencies. A hybrid is the answer in most cases. Among mid-sized B2B companies, a common setup keeps strategy and content planning in-house and outsources production and media buying.
Once you decide to bring marketing in-house, hiring and training follow. If you hand everything the agency did to one person and hire them as a 'digital marketer,' that person ends up handling ad operations, content, design, and data analysis alone, and leaves within a year. Building a marketing team in-house means a bundle of roles, tools, and training, not a single hire, and next year's training plan should include marketing automation, analytics tools, and AI skills. Conversely, if you choose an agency, your company needs the ability to write briefs and evaluate results for the agency to do its job well. That ability is also something to train.
The most common mistake in practice is going all-outside or all-inside. A company cuts its agency to save money and hires one person, then that person quits and neither the ad account passwords nor past campaign materials remain. The opposite is just as common: handing strategy to the agency too, and ending up with thick monthly reports but nothing sales can actually use. Ad accounts, analytics tools, and original content should stay in the company's name whether or not you use an agency, and contracts should include clauses on deliverable ownership and account transfer. Judge the agency not by impressions but by the same metrics as your in-house team, such as leads and pipeline contribution, so you can make a sound renewal decision next year.
John KimInstructor John Kim, author of B2B Marketing Design and CEO of Nanum Consulting
Euijung KimBrand strategist with 30 years in advertising, formerly a division head at Daehong CommunicationsThe make-or-buy decision from manufacturing and IT has become standard in marketing. As digital channels and data tools multiplied, reliance on agencies grew. Then companies realized that customer data and content assets need to be built in-house. Today, a hybrid approach that splits work between in-house teams and agencies by function is the usual choice among B2B companies.
Consider a hypothetical case. Company A makes industrial pumps, with 260 employees and KRW 52 billion (≈ US$38,904,700) in annual revenue. It had outsourced all of its marketing to a single agency for KRW 240 million (≈ US$179,600) a year. A 60-page report arrived every month, yet the sales division said, 'We have no proposal materials we can actually use.' In the budget meeting for next year, the CEO asked whether the company should hire in-house marketers.
- Ms. Lim, a deputy general manager on the business planning team, broke the agency's work into 14 tasks and scored them on four criteria: frequency, expertise, weight of product knowledge, and speed. She concluded that four must stay in-house: technical proposals, case studies, sales coordination, and performance management.
- Reviewing the agency contract, Lim found that the ad accounts and analytics tools were in the agency's name and that there was no clause on ownership of original content. She added account transfer and deliverable ownership to the renewal terms and narrowed the scope to ad operations and video production.
- Instead of one marketing hire, the company hired two: someone with content and product marketing experience, and a marketing operations specialist. The CEO approved KRW 110 million (≈ US$82,300) in payroll after Lim said, 'If one person does it all, they will leave within a year.'
- Next year's training plan included marketing automation tool training for the two hires and a brief-writing workshop for the sales division. The agency's evaluation metric changed from report length to the number of leads and conversion to sales opportunities.
- A year later, total marketing spend had grown from KRW 240 million (≈ US$179,600) to KRW 260 (≈ US$1) million, but the proposal documents sales actually used went from 0 to 21, and the opportunity conversion rate of leads from agency ads rose from 9% to 19%.