TL;DR

• We're enhancing Delphi membership with discounts on our Digital Agency Growth Review.
• We tested 29 variables across eight years of our State of Digital Services data to find what consistently separates Fast-tier growers from the rest.
• Five factors provided durable positive impacts on agency growth.
• Bigger engagements — the most stable signal in the analysis.
• Bigger clients
• Service specialization (by service mix, not by industry alone)
• Raised hourly rates
• Service mix evolution — the smallest of the five, but standing still on services has been the worst posture in four of five years.
• Agencies that pulled all five levers in the same year landed in the Fast tier 55% of the time. Agencies that pulled none were Fast tier 0% of the time.
• We have new research live over on WP Engine's site.

Durable Agency Growth

Agency growth advice tends to come in discrete sound bites:

Each one gets sold as the answer because someone saw it work. The issue is that we haven’t had any kind of long-run analysis that segments and quantifies the advice. Until now.

We looked back at 29 individual factors across 931 digital agencies from 2018 onward and analyzed their correlations with agency growth.

For each year, we ranked respondents by revenue growth and split them into three tiers: the bottom 25% are Slow, the top 25% are Fast, and the middle 50% are Average. Flexing the cutoffs each year allowed us to reduce the macro noise and focus on the agency impacts.

So, what consistently separates Fast from Slow agencies?

Five factors were highly correlated with fast agency growth:

• Larger engagements
• Bigger clients
• Service specialization
• Raising rates
• Shifting service mix

Let’s dive into the data behind each.

Grow Engagements

The single strongest predictor of landing in the Fast tier is whether the agency's typical engagement got larger. They were 2 to 6 times more likely to land in the Fast tier than agencies whose engagements got smaller.

The "got larger" bucket combines slight and significant expansions. The lift is even bigger when limited to "significantly larger" (44-80% Fast in those years), but the per-year samples for that subset are small (5-17 agencies), so the combined numbers above are the more reliable comparison.

Bigger engagements concentrate revenue into fewer accounts, lowering sales and account management costs and freeing senior capacity to develop the business further.

Bigger Clients

Similar to engagement size, getting bigger clients was also correlated with faster growth.

In 2024, we introduced the client-size question to the survey, resulting in a three-year window that is shorter than the seven-year span used for engagement size. Because of this, client size hasn’t been tested across as many macroeconomic environments as the other metrics. Even so, the growth impact has been consistent in every year measured.

• Agencies that grew engagement size while client size held steady: 43% were considered Fast
• Agencies that grew client size while engagement size held steady: 38% were considered Fast
• Agencies that did neither: 11% were considered Fast
  ​

Specialize By Service

Service specialists landed in the Fast tier 1.2 to 3 times more often than service generalists across the three most recent waves:

The gap was largest in the two hardest years for the industry. When budgets tighten, a specialist with proven expertise is harder to cut than a generalist whose work could move to an in-house team or a cheaper alternative.

One nuance worth flagging: this is service specialization, not industry specialization. Pure industry verticalization (i.e., "we do everything for healthcare") doesn't show the same growth lift on its own in our data.

Layering industry specialization on top of service specialization makes the lift bigger, but most of the growth benefit comes from service specialization.

Raise Rates

Agencies that raised their hourly rates were more likely to land in the Fast tier than agencies that held rates flat or cut them, in every year we have rate-change data for.

The gap is modest in most years, but wider in 2022 and 2025.

This is more about continually raising rates and the underlying dynamics that make that possible, than it is simply charging a high rate. We tested the hourly rate level (band) as a separate variable, and it did not show a durable Fast-tier signal. Agencies in the $200+/hr band weren't consistently more likely to be in the Fast tier than agencies in the $75-99/hr band.

Evolve Your Service Mix

From what we’ve seen, moderate service expansion leads to faster growth, especially in difficult economic environments, but it also provides the smallest and most inconsistent lift of the three levers. In fact, in our most recent 2026 State of Digital Services Report, we found that while expansion led to faster-than-average growth, agencies that reduced their service mix achieved even faster growth. So, the long-run data shows expanding services typically lead to faster growth, but there are cases when service mix reductions are the better option.

This boils down to the idea that agencies should regularly evaluate and evolve their service mixes in response to market trends. Our Delphi network helps agency leaders keep track of these trends in real time. In fact, we just flagged a large shift in service demand in our latest readout.

Different Length Levers

Each lever has a different impact on growth, but for each one pulled, it adds to the chance that the agency will land in the Fast tier.

Grow Faster

Use these levers to reliably grow your agency faster than average:

Focus on selling larger engagements, as this is the most durable finding across the entire panel and can be acted upon regardless of positioning.

Sell to larger clients within reason. Don’t jump from bakeries to enterprise, but methodically moving up market is associated with faster growth.

Specialize your services, since generalists landed in the Fast tier only 10-19% of the time, whereas specialists landed in the Fast tier 29-32% of the time. The cost of remaining a generalist is highest during tough years.

Raise your rates, and get in the habit of doing this across accounts regularly. It’ll force your team to deliver and communicate the value necessary to make this possible.

Keep your service mix flexible. Standing still on underperforming services was detrimental in four of the five years. Expansion proved to be a safer strategy most of the time, though the 2025 shift toward reducing services is worth noting.

Most shops should do all of these if they can, as agencies that did landed in the Fast tier 55% of the time.

Hopefully, this will help you build a faster-growing agency!

If you'd like help diagnosing and solving your agency's revgen challenges, check out our Digital Agency Growth Review.

Until next time,