A buy and build integration consultant is one of the first outside hires a platform makes after the initial acquisition, and the decision usually lands on an operating partner or the platform CEO while three or four add-on LOIs are already in the pipeline. The commercial stakes are direct. If the second and third acquisitions bolt on without a repeatable integration playbook, the synergy case in the model quietly slips a quarter or two, and the exit multiple that assumed a clean, consolidated platform starts to look optimistic. This page is for the person signing that engagement, not for someone learning what a roll-up is.
The question is rarely whether to buy help. It is what to buy, who owns which decision, and how to tell in the first sixty days whether the money is producing integration or producing documents. Bain’s annual private equity report has tracked the shift toward buy-and-build as a primary value creation lever, which means the integration function is now something you underwrite at deal committee rather than improvise after close (Bain & Company Global Private Equity Report).
1. Decide what the consultant actually owns before you scope the work
The most common failure in these engagements is buying a strategist when the platform needs an operator with decision rights, or the reverse. Both are legitimate roles, and they cost roughly the same, so the mistake is expensive and invisible until Day 30.
Three separable jobs usually get bundled under one title. First, integration architecture, meaning the target operating model, the systems of record, and the sequencing across add-ons. Second, execution management, meaning someone who runs the workstreams, chases owners, and holds the integration schedule against actual. Third, functional depth in the systems that carry synergy, most often the CRM, ERP, and the finance close.
Write the scope against which of the three you are short. A platform with a strong CFO and a weak PMO needs execution management. A platform with capable functional leads but no consolidation blueprint needs architecture. Confusing the two produces a consultant with strong opinions and no one to hand them to.
McKinsey’s work on programmatic M&A makes the same point in different language: firms that acquire frequently build institutional integration capability rather than treating each deal as bespoke (McKinsey private capital research). Your consultant should be building that capability, not renting it to you deal by deal.
2. Separate the platform decision from the per-deal work
A buy-and-build has two distinct integration problems, and they run on different clocks. The platform problem is deciding once what the consolidated business looks like: one CRM instance or federated, one chart of accounts, one order-to-cash process. The per-deal problem is folding each add-on into that target without breaking the acquired revenue.
Good consultants push you to settle the platform questions early, even before the second acquisition closes, because every add-on integrated against an undecided target has to be redone. That rework is where synergy timelines slip. If the person you are interviewing wants to treat every add-on as a fresh integration, they are describing a staffing arrangement rather than a platform.
This is where the sequencing overlaps with wider roll-up delivery. The scoping discipline in roll-up integration services and how to judge the work applies directly, and the standing coordination function is covered in merger integration management office services. A serial acquirer usually needs the office to persist across deals, not a consultant who leaves after each one.
3. Anchor the engagement to the synergy case, not to activity
The engagement should be scoped against the specific synergies in the deal model, with a named owner and a baseline for each. Cost synergies from consolidating overlapping systems, revenue synergies from cross-sell across the acquired customer bases, and working capital improvement from a faster, single close are the usual three.
Ask the consultant to map their plan to those line items. If they cannot tell you which workstream produces which number, and by when, they are selling motion. Harvard Business Review’s coverage of M&A has documented for years that synergy capture, not deal thesis, is where most transactions underperform (Harvard Business Review, M&A). The consultant’s job is to move those numbers from forecast to realized, and the engagement should read that way on paper.
Classify every claimed impact honestly at the outset. A cross-sell target is forecast until a pipeline exists. A systems consolidation saving is enabled once the migration completes and realized once the duplicate contract is actually cancelled. Holding that distinction stops a status deck from reading as a P&L improvement.
4. Get the systems consolidation plan on the table early
In most buy-and-builds the carrier of both cost and revenue synergy is the revenue and finance stack. Two CRM instances mean two versions of the customer, no clean cross-sell view, and duplicate licensing. Two ERPs mean a consolidation that runs on spreadsheets and a close that takes a week too long.
A serious consultant brings a systems consolidation sequence, not a preference for a favored tool. The realistic patterns and their trade-offs are laid out in CRM and ERP integration post merger, and the ongoing revenue operating discipline in outsourced RevOps for a portfolio company.
Where a buy-and-build also includes carve-outs from larger sellers, the same person often has to unwind a TSA and stand up separated systems, which is a distinct competence. Judge that against the standards in how to buy and judge a divestiture technology separation consultant and the broader divestiture IT consulting in private equity. A consultant who is strong at bolting on but weak at separating will stall the moment a carve-out enters the pipeline.
5. Test the diligence-to-integration handoff
The integration plan for each add-on is only as good as the diligence that fed it. If the consultant is inheriting a target that was diagnosed by a separate team, ask how the findings transfer, because a risk that surfaced in technology due diligence and never reached the integration owner becomes a Day 60 surprise.
The best arrangement connects the two. The diligence read on a target’s data quality, its contract portability, and its technical debt should land directly in the integration risk register with owners attached. The standards for that pre-close read are in carve-out technology due diligence, and the near-term execution rhythm in how to buy and judge a 100 day integration plan consultant.
PitchBook and S&P Global Market Intelligence both publish deal-activity data that shows how compressed add-on timelines have become (PitchBook research and data; S&P Global Market Intelligence). A weak handoff is what turns a compressed timeline into a missed one.
6. Judge the work in the first sixty days
You do not have to wait for the exit to know whether the engagement is working. Two early tests separate delivery from theater.
The plan reconciles to the model
By Day 30 there should be an integration plan whose workstreams map to the synergy line items, with baselines and owners, and a schedule that shows actual against plan rather than a static Gantt chart. If the first month produces frameworks with no baselines, the engagement is drifting.
Owners inside the business, not just on the consultant’s slide
Every workstream should have a named owner who is an employee of the platform, with the consultant driving and holding accountability. An engagement where the consultant owns everything creates a dependency that surfaces the day they leave. This is the same discipline used for Day One readiness on a carve-out, and it applies to the platform’s first 100 days as much as to any single add-on.
When the synergy case leans on marketing and revenue systems specifically, hold the relevant lead to the criteria in how to judge a marketing operations consultant in private equity. Governance research from the Harvard Law School Forum on Corporate Governance and reporting from Private Equity International both reinforce that board-level visibility into integration progress is now expected, not optional (Harvard Law School Forum on Corporate Governance; Private Equity International). The plan should be legible to a director at the first board meeting after close.
7. A next-step checklist before you sign
- Name which of the three roles you are short: architecture, execution management, or functional depth. Scope to that, not to the title.
- Settle the platform-level target operating model and systems of record before the second add-on closes.
- Require a mapping from each workstream to a specific synergy line item, with a baseline and an owner.
- Classify each impact as forecast, enabled, or realized, and refuse to let a deck read as a P&L improvement.
- Confirm the diligence-to-integration handoff puts identified risks into the integration risk register with owners.
- Set the Day 30 and Day 60 tests in the statement of work so you can judge delivery before the engagement is over.
- Insist every workstream has an internal owner, so capability stays in the business after the consultant exits.
BCG’s principal investors research and the industry reporting in Buyouts, PE Hub, and Preqin all point the same direction: platforms that treat integration as a repeatable capability compound faster than those that improvise (BCG principal investors & private equity; Buyouts; PE Hub; Preqin alternative assets data). A buy and build integration consultant is worth the fee when they leave that capability behind, not just a plan.
If you are scoping this hire against a live add-on pipeline and want an execution partner who ties the integration plan to the synergy case and to the systems that carry it, review the M&A advisory and PMI sprint work through the DevriX private equity practice.