Growth agency or marketing agency: what actually changes.
The words get used interchangeably. They should not be. The difference is not the services on the menu, it is the number the agency is accountable for, and it changes everything about how they work.
Short answer: a marketing agency is paid to run channels. A growth agency is paid to move a business number. Both might run your Google Ads; only one of them is on the hook when the ads produce clicks and no customers.
The difference in one table
| Marketing agency | Growth agency | |
|---|---|---|
| What they report | Impressions, clicks, reach, ROAS | Cost per enquiry, cost per customer, revenue by channel |
| Where they start | The channel you asked for | Your funnel, then whichever channel is leaking |
| Tracking | Often inherited as found | Fixed first, because nothing else can be judged without it |
| The website | Someone else's problem | The first thing that gets audited, because paid traffic to a broken page is money on fire |
| Pricing | Often a percentage of spend | Should be a flat fee, so scaling your budget does not scale their invoice |
| How you leave | Contract term | Month to month once the build is live, because they should earn it monthly |
Why the distinction matters more for ecommerce
An online store has a dozen places the money can leak between a click and a sale: a slow product page, a shipping surprise at checkout, a pixel that double counts, an email flow that never fires. A channel agency optimises its channel and hands you a ROAS. A growth agency asks why the ROAS is not turning into profit, and the answer is usually not in the ad account.
That is why the category exists. Not because "growth" sounds better, but because a store that is paying three separate specialists to optimise three separate channels has nobody accountable for the whole thing.
Five questions that tell you which one you are talking to
1. "What number will you report to me monthly?"
If the answer is clicks, impressions or ROAS, it is a marketing agency. If the answer is cost per customer and revenue by channel, keep listening.
2. "What do you do in the first two weeks?"
A growth agency fixes tracking and reads the funnel before spending anything. A channel agency launches campaigns.
3. "Is your fee tied to my ad spend?"
A percentage of spend means the agency earns more when you spend more, whether or not it works. A flat fee removes that conflict. We charge a flat fee and no mark-up on media, and we say so on every page.
4. "What happens if it is not live in ninety days?"
Most agencies do not have an answer. Ours is that you stop paying until it is. Any agency that will not put a commitment on the build timeline is asking you to carry all the risk.
5. "Will you tell me if I should not spend more?"
Every market has a ceiling where more budget buys worse customers. A growth agency says so and moves the money elsewhere. A channel agency has no reason to.
Where the line blurs
Plenty of agencies call themselves growth agencies and report ROAS. Plenty of marketing agencies do excellent full-funnel work. The label is a claim, not a proof. Use the five questions, not the name on the door.
Questions owners ask
Is a growth agency more expensive than a marketing agency?
Not necessarily. The fee structure matters more than the number: a flat monthly fee scoped to your revenue stage usually costs less than a percentage of spend once your budget grows, and it removes the incentive to push spend for its own sake.
Can a growth agency work with my existing ads agency?
Yes, and it often starts that way. The growth work is the tracking, the site and the funnel; the channel specialist keeps running the channel. Over time most brands consolidate because one accountable team is simpler.
Does Sellevate call itself a growth agency?
Yes, and we hold ourselves to the five questions above. Flat fee, no mark-up on media, tracking fixed first, reported as cost per customer, and live in ninety days or you stop paying until it is.
Rather just get the answer for your business?
The free audit applies all of this to your market, your competitors and your numbers. Thirty minutes; the findings are yours either way.