In-House 82%, External 92%: Both at Peak

What the Number Says

The curve carries three layers, three lessons.

In-housing is a permanent structure, not a fashion

A share that doubles over fifteen years and rises at every reading is a settlement pattern, not a swing; the survey’s own forecast puts saturation at 85-90 percent. Nine companies in ten now do part of their marketing under their own roof — internal capability moved from exception to default. The debate has passed “should we build” and arrived at “what should we build”.

The external agency didn’t die; its job changed

Ninety-two percent refutes the obituary — and the rise of that figure says the two models run as complements, not rivals. The survey’s own reasons point the same way: the outside steps in when internal capacity fills and where internal capability ends. The external agency’s new job is not carrying all the work; it is carrying what the inside cannot — and teaching the inside to carry more.

The 61-39 split proves a ruler exists

Work dividing 61-39 on average means every company operates a division-of-labour ruler — usually an unwritten one. The unwritten ruler is drawn by habit and by whoever pitched last; the written one, by criteria. The written version is this set’s first tip — the split already exists everywhere; the job is making it deliberate.

What the Headline Misses

The headline narrates the in-house triumph; the guidance sits in three details.

What moves inside follows one pattern

The series’ breakdowns show which work migrates first: continuous, brand-close, repeating jobs — content, social, digital creative. What stays outside is equally patterned: deep-specialism, heavy-infrastructure work. When thousands of independent decisions land on one pattern, the pattern is not coincidence but criterion — and a criterion can be written into a ruler without every company rediscovering it alone.

The in-house shop’s two chronic ailments never changed

Across the whole series, members’ top two worries stay fixed: keeping talent energised and attracting good talent at all. The in-house agency cuts cost and imports the talent problem: what used to be the agency’s headache becomes the company’s. The in-housing decision is also a decision to own those two ailments — made without writing them into the ledger, it is made incompletely.

Workload grows faster than capacity

In the latest reading, nearly all in-house shops report rising workload and two-thirds say it rose “a lot”. Success attracts work — and then buckles under it: the top reported challenges are managing flow and resources. An internal capability is finished not on the day it opens but on the day its overflow rule is written: which work, at which threshold, spills back outside?

What a Business Should Do

The number’s decision translation is three steps.

Take the dilemma off the table

“Should we hire an agency or build a team” has no counterpart in the data; the honest opening line is: which of our work lives better inside, which outside? Once the question changes, the debate leaves its trenches and becomes a criteria conversation — and both camps start filling the same ruler’s two columns.

Measure your own 61 percent

The current split takes half an hour to photograph: last quarter’s marketing work listed, each row tagged inside/outside, hours and budget summed. That photograph is the ruler’s baseline — most companies see their own split for the first time, and question it for the first time: why is this row where it is?

Grade the outside by its new job

The external partner is now measured on two duties: carrying what the inside cannot, and teaching by handing over what it can. Beside the delivered work sits the left-behind capability — fish, or fishing rod? That measure is also the selection question, and the set’s second tip wires it into a full test.

The series’ record is in the ANA’s report announcement.

When both curves peak at once, the answer is neither of them; it is the line drawn correctly between them.