Buy & Build Waterfall Charts: Visualizing Platform + Add-On Value Creation

Why buy-and-build needs its own waterfall

A standard value creation bridge works for single-asset deals. But buy-and-build strategies have a more complex value creation story: the platform grows organically, add-on acquisitions contribute incremental EBITDA, synergies between the platform and add-ons create additional value, and increasingly, digital and AI transformation creates a value layer that didn't exist pre-acquisition.

A buy-and-build waterfall separates these layers so the IC, LP, or board can evaluate each component independently. The platform's organic growth is one question. The add-on acquisition strategy is another. Synergy realization is a third. Conflating them into a single "revenue growth" bar obscures the strategy and makes it harder to assess risk.

The anatomy of a buy-and-build waterfall

Platform baseline

The starting bar represents the platform company's EBITDA at acquisition (or at the start of the measurement period). This is the anchor — everything else is measured relative to it. A strong platform baseline (growing organically, with defensible market position) is the foundation of a credible buy-and-build story.

If the platform itself has grown organically since acquisition, consider splitting this into "Platform at Entry" and "Platform Organic Growth" as two separate bars. This shows that the base business is healthy independent of the M&A activity.

Add-on contributions

The EBITDA contributed by acquired add-on companies, measured at their standalone run-rate at the time of acquisition. This bar should reflect the add-ons' EBITDA before any synergies — the synergies are shown separately to demonstrate that the integration is creating additional value beyond what was acquired.

For portfolios with many add-ons, you have two options: show each add-on as its own bar (if there are 3-4), or group them into a single "Add-on Contributions" bar (if there are 5+) with a backup slide showing the individual breakdown. The waterfall should remain readable — more than 9 bars and the story gets muddy.

Procurement synergies

Cost savings from combining purchasing power across the platform and add-ons. This is typically the largest and most predictable synergy category in buy-and-build strategies because it's math-driven: more volume = better pricing from suppliers.

Common procurement synergies: raw material volume consolidation, logistics network optimization, indirect spend consolidation (IT, insurance, benefits), and supplier rationalization. The waterfall bar should reflect annualized run-rate savings, not one-time benefits.

SG&A synergies

Overhead savings from eliminating duplicate functions across the platform and add-ons — duplicate CFOs, duplicate HR teams, duplicate IT infrastructure. SG&A synergies are the second-largest synergy category but take longer to realize because they involve organizational changes and, often, difficult personnel decisions.

Separating procurement and SG&A synergies (rather than combining them into a single "synergies" bar) is important because they have different risk profiles and timelines. Procurement synergies can often be captured within 6 months; SG&A synergies typically take 12-18 months.

Digital/AI transformation impact

The EBITDA impact of digital and AI initiatives implemented across the combined platform. This is the newest driver in buy-and-build waterfalls, but it's becoming increasingly significant. Examples:

• Revenue uplift from e-commerce, digital marketing, and data-driven pricing
• Cost reduction from process automation, AI-powered demand forecasting, and predictive maintenance
• Working capital improvement from better inventory optimization using ML models
• Customer retention from churn prediction models and personalized engagement

Showing digital/AI as its own bar signals to the IC that the firm has a modern operating playbook that goes beyond traditional cost-cutting. It also positions the asset for a higher exit multiple, since buyers increasingly pay premiums for digitally mature businesses.

Integration costs

The negative bar that keeps the waterfall honest. Integration costs include IT system migrations, rebranding, facility consolidation, severance, and project management overhead. Showing this bar — and keeping it small relative to the synergy bars — demonstrates that the strategy is capital-efficient.

Design principles for buy-and-build waterfalls

Use subtotals strategically

Add a subtotal bar after add-on contributions (showing "Combined pre-synergies EBITDA") to separate the M&A story from the integration story. This creates a natural break point: the first half of the chart answers "what did we buy?" and the second half answers "what did we do with it?"

Annotate with synergy capture rate

Add callouts showing what percentage of identified synergies have been captured. "Procurement synergies: $22M (78% captured)" tells the IC both the value and the execution progress. If the chart is forward-looking, show the target with a confidence indicator.

Time-stamp the waterfall

Always clarify the time period. "Year 1 to Year 5" tells a different story than "At acquisition to current run-rate." If the chart mixes realized and projected values, use different bar shading (solid for realized, hatched for projected) to make the distinction visible.

Common pitfalls in buy-and-build waterfalls

• Double-counting synergies. Ensure that procurement savings attributed to add-on integration aren't also counted in the platform's organic improvement. A clear methodology note in the source line prevents this.
• Overstating digital/AI impact. Be conservative. If the AI pricing tool is projected to deliver $15M in EBITDA but has only been live for 3 months, show the annualized run-rate with a caveat, not the full-year projection.
• Ignoring dis-synergies. Customer overlap between add-ons and the platform can lead to revenue losses. If material, include a small negative bar for "dis-synergies" to maintain credibility.
• Too many bars. With platform, organic growth, 4 add-ons, 3 synergy types, digital impact, and integration costs, you can easily reach 12+ bars. Ruthlessly consolidate: group add-ons, group synergies if needed, and move detail to backup slides.

Build a buy-and-build waterfall now

The Buy & Build template in Waterfall Maker is pre-configured with the standard framework — platform baseline, add-on contributions, procurement synergies, SG&A synergies, digital/AI impact, integration costs, and combined EBITDA. Enter your portfolio numbers, write an action title, and download a fully editable PowerPoint slide ready for your next board meeting or IC presentation.