Private Equity Due Diligence Case Interview: Worked Case
| Case type | Growth |
|---|---|
| Industry | Building Materials / Private Equity |
| Difficulty | Hard |
| Firm style | Bain |
The case prompt
Your client is a private equity firm considering acquiring SurfacePro Materials, a manufacturer of engineered stone countertops. They want to understand the market dynamics and growth potential before making a $400M bid.
SurfacePro Materials manufactures engineered quartz countertops (branded as "QuartzLux") for residential and commercial markets. The PE firm sees an opportunity because engineered stone has been gaining market share from natural stone (granite, marble). SurfacePro has approximately 2.7% of the engineered stone segment by revenue, positioning it as a fast-growing specialty brand. The PE firm wants to know if the acquisition is attractive at $400M.
The exhibits
Exhibit 1
US Countertop Market Share by Material (%)
US countertop market share by material (%), 2020-2024. US countertop TAM: ~$18B (2024), growing ~6% CAGR.
Show the data behind Exhibit 1
| Material | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|
| Granite | 42% | 39% | 35% | 31% | 27% |
| Engineered Stone | 22% | 25% | 29% | 33% | 37% |
| Laminate | 18% | 17% | 17% | 16% | 16% |
| Marble | 10% | 10% | 10% | 11% | 11% |
| Other | 8% | 9% | 9% | 9% | 9% |
| US TAM ($B) | $14.2B | $15.0B | $16.1B | $17.2B | $18.0B |
| Eng. Stone Segment ($B) | $3.1B | $3.8B | $4.7B | $5.7B | $6.7B |
Exhibit 2
Material Performance Ratings (1-10 scale)
Material performance ratings (1-10 scale) by attribute — durability, stain resistance, low maintenance, aesthetics, price value — across engineered stone, granite, marble, and laminate.
Show the data behind Exhibit 2
| Attribute | Customer Importance Rank | Engineered Stone | Granite | Marble | Laminate |
|---|---|---|---|---|---|
| Durability | #1 | 9 | 7 | 5 | 4 |
| Stain Resistance | #2 | 9 | 5 | 3 | 7 |
| Low Maintenance | #3 | 9 | 5 | 4 | 8 |
| Aesthetics | #4 | 7 | 8 | 9 | 5 |
| Price Value | #5 | 6 | 5 | 3 | 9 |
Exhibit 3
Material Price vs Weighted Performance Score
Material price ($/sq ft) vs weighted performance score, by material.
Show the data behind Exhibit 3
| Material | Avg Price ($/sq ft) | Weighted Perf. Score | Price vs Eng. Stone | Target Segment | Satisfaction (switched to Eng. Stone) |
|---|---|---|---|---|---|
| Marble | $85 | 5.0 | +31% | Luxury | 85% satisfied |
| Engineered Stone | $65 | 8.4 | Baseline | Mid-Premium | N/A |
| Granite | $58 | 6.2 | -11% | Mid-Range | 85% satisfied |
| Solid Surface | $45 | 5.5 | -31% | Value | N/A |
| Laminate | $25 | 6.4 | -62% | Budget | 85% satisfied |
Exhibit 4
| Switched From | Highly Satisfied | Somewhat Satisfied | Would Switch Back |
|---|---|---|---|
| From Granite | 55% | 30% | 15% |
| From Marble | 50% | 35% | 15% |
| From Laminate | 60% | 25% | 15% |
Exhibit 5
SurfacePro Cost Advantage vs Industry ($/sq ft)
Cost bridge from industry average to SurfacePro total cost, by cost component ($/sq ft).
Show the data behind Exhibit 5
| Cost Component | SurfacePro ($/sq ft) | Industry Avg ($/sq ft) | Advantage |
|---|---|---|---|
| Raw Materials | $12 | $14 | $2 lower |
| Manufacturing | $10 | $12 | $2 lower |
| Distribution | $8 | $7 | $1 higher |
| SG&A | $5 | $6 | $1 lower |
| Total Cost | $35 | $39 | $4 lower |
| Selling Price | $65 | $60 | Premium pricing |
| Gross Margin | $30 (46%) | $21 (35%) | 11pp advantage |
BainGrowth · hard
SurfacePro Materials PE Growth
Building Materials / Private Equity
How a strong candidate structures it
A strong framework for this PE acquisition case would cover
Alternative valid frameworks include: due diligence framework, or Porter's Five Forces for industry attractiveness.
Question by question
- 1
Case context
Understand the Case
“Can you summarize the situation?”
- 2
Clarifying
Clarifying Questions
“What clarifying questions would you ask?”
- 3Drill the structure
Structure
Framework
“How would you structure your evaluation?”
- 4Drill the brainstorming
Analysis
Market Share Trends
“Let's look at the countertop market share trends. Which material is winning share and at whose expense? What does this trend mean for SurfacePro's growth trajectory?”
- 5Drill the brainstorming
Analysis
Product Superiority & Switching Behavior
“Why is engineered stone winning, and is this trend sustainable?”
- 6Drill the math
Math
Revenue Growth Projection
“Look at Exhibit 5 which shows SurfacePro's cost structure. SurfacePro's current revenue is $180M and it has been growing at 15% annually. Project the revenue out to Year 5 by applying 15% annual growth. What does SurfacePro's margin advantage tell you about the quality of this revenue?”
- 7Drill the math
Math
Exit Valuation and Return
“If the PE firm buys SurfacePro at $400M and exits in 5 years at a 2.5x revenue multiple, what is the exit value and the return on the investment?”
- 8Drill the brainstorming
Analysis
Risk Assessment
“Looking at the pricing landscape, what are the key risks to this investment thesis?”
- 9Drill the synthesis
Synthesis
Final Recommendation
“What is your recommendation to the PE firm?”
The worked path
The numbers that decide it
- Engineered stone gained 15pp of market share over 5 years (22% to 37%), primarily taking from granite
- Engineered stone dominates on the top 3 attributes customers care about most: durability, stain resistance, and maintenance
- 85% of customers who switch to engineered stone would NOT switch back — this is a one-way migration
- The overall market trend strongly favors engineered stone, making SurfacePro a bet on the winning category
- SurfacePro grows ~15% annually, below the segment's ~20%+ — it is losing relative share, though still growing in absolute terms within a fast-growing market
- At $400M for $180M revenue (~2.2x revenue), the valuation is reasonable if growth continues at 12-15%
- SurfacePro's 46% gross margin vs 35% industry average provides both a competitive moat and pricing flexibility to defend share
- Engineered stone at $65/sq ft sits between granite ($58) and marble ($85) — a defensible mid-premium position
- Key risk: the 3 larger competitors could engage in price war or expand capacity to fight market share gains
Analysis Flow
- 1
Assess market dynamics (Exhibit 1)
- Engineered stone grew from 22% to 37% share in 5 years
- Granite lost 15pp — clear secular trend
- Segment growing at ~20%+ annually
- 2
Understand why (Exhibit 2)
- Engineered stone scores 9/10 on top 3 customer priorities
- Only loses on aesthetics (to marble) and price value (to laminate)
- Neither competitor advantage is enough to reverse the trend
- 3
Assess sustainability (Exhibit 4)
- 85% won't switch back — this is sticky demand
- Creates a compounding growth dynamic: share gains don't reverse
- 4
Evaluate pricing position (Exhibit 3)
- Engineered stone at $65/sq ft sits between granite ($58) and marble ($85)
- 11% premium over granite is modest given superior attributes
- 62% premium over laminate reflects quality positioning
- Mid-premium position is defensible
- 5
Project revenue growth (Exhibit 5 for margin context)
- SurfacePro: $35/sq ft total cost, $30 margin (46%) vs industry $21 margin (35%)
- At 15% growth for 5 years: revenue reaches ~$362M (roughly doubling from $180M)
- 6
Calculate exit valuation and return
At 2.5x Year 5 revenue: $362M × 2.5 = $905M exit value
Return multiple: $905M / $400M = ~2.3x
- IRR: ~18% — exceeds typical PE hurdle rate
Final Synthesis
Recommend acquiring SurfacePro. The engineered stone market is in a secular growth trend driven by superior product attributes, and customer switching is one-way (85% retention). SurfacePro has a structural cost advantage (46% vs 35% margin) and occupies a defensible mid-premium pricing position. At $400M, the deal offers strong return potential (~2.3x, ~18% IRR) with margin upside from distribution optimization.
BainGrowth · hard
SurfacePro Materials PE Growth
Building Materials / Private Equity
Why this case
This private equity case tests the difference between a strong category and a merely adequate target. SurfacePro benefits from a 15-point share shift and sticky switching, yet grows about 15% annually versus a segment growing 20% or more. The industry-specific trap is recommending the deal from market momentum alone without checking relative share, pricing power, margins, and competitor response.
FAQ
- What is the first question in this PE due diligence case?
- Start by asking whether the market is attractive enough to support the investment thesis. Here, engineered stone rises from 22% to 37% share over five years, while the segment grows at about 20% or more. Then test whether SurfacePro can capture that trend, rather than assuming category growth transfers automatically.
- Why does the 85% switching result matter?
- It indicates durable demand rather than a temporary share movement. Across the surveyed switching groups, 85% would not return to their prior material. That supports the engineered stone thesis because customers value durability, stain resistance, and low maintenance, the top three priorities where engineered stone scores 9 out of 10.
- How should I assess SurfacePro's valuation?
- Compare the $400M bid with $180M of current revenue, then project revenue using the case's 15% annual growth. The five-year projection reaches about $362M. At a 2.5x revenue exit multiple, that implies about $905M of exit value and a roughly 2.3x return before testing downside assumptions.
- What is the main downside risk in this case?
- The main risk is competitive retaliation. Three larger competitors could add capacity or start a price war as engineered stone gains share. SurfacePro's $65 per square foot price and 46% gross margin provide some flexibility, but the investment case still depends on defending its mid-premium position while growth continues.
BainGrowth · hard
SurfacePro Materials PE Growth
Building Materials / Private Equity