The honest answer is that most plumbing owners have no idea what their business is worth — and the estimates they get are usually wrong in one direction or another. A broker overshoots to win the listing. An accountant looks at book value. A buyer's offer comes in and it doesn't match either. The real number lives somewhere specific, and understanding how to calculate it changes everything about your decisions.
EBITDA vs. SDE: Which One Applies to Your Business?
This distinction matters more in plumbing than almost any other trade. EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) is the standard for institutional buyers — PE firms, strategic acquirers, search funds above $2M in deal size. SDE (Seller's Discretionary Earnings) adds back the owner's salary on top of EBITDA and is used for smaller owner-operator businesses where the buyer is replacing the owner.
The dividing line is roughly $500K in annual earnings. Below that, expect SDE-based valuations and buyers who are buying a job. Above that, you're in EBITDA territory and buyers are buying a business that can run without you. The multiple on SDE (2.5–4x) looks lower than EBITDA (3.5–6x+), but they're measuring different things — make sure you're comparing apples to apples when you see an offer.
| Business Size | Valuation Method | Typical Multiple | Buyer Profile |
|---|---|---|---|
| Under $300K EBITDA | SDE | 2.5–3.5x SDE | Individual buyers, owner-operators |
| $300K–$750K EBITDA | SDE or EBITDA | 3–4.5x | Search funds, small PE, individuals |
| $750K–$2M EBITDA | EBITDA | 4–6x | Regional PE, strategic roll-ups |
| $2M–$5M EBITDA | EBITDA | 5.5–7x | Institutional PE, national strategics |
| $5M+ EBITDA | EBITDA | 6–9x | Large PE platforms, strategic acquirers |
Add-Backs: The Adjustments That Change Your Number
Add-backs are legitimate business expenses that a buyer wouldn't incur — owner's salary above market rate, personal vehicles, cell phones, health insurance run through the business, one-time legal fees, COVID-related expenses. Every dollar of verified add-back increases your EBITDA and therefore your enterprise value. At a 5x multiple, a $50K add-back is worth $250K at exit.
The key word is "verified." Buyers will request documentation for every add-back. A number you can't document gets challenged. A clean, well-organized add-back schedule with receipts and explanations is worth more than the same number buried in messy books.
- Owner salary above market: If you pay yourself $300K but a GM would cost $120K, the $180K difference is a legitimate add-back.
- Personal vehicle expenses: Trucks run through the business for personal use, fuel, insurance. Document the business-use percentage.
- Non-recurring expenses: One-time legal fees, equipment write-offs, extraordinary repairs — things that won't repeat.
- Owner benefits: Health insurance, life insurance, retirement contributions above what a replacement employee would receive.
- Family payroll: If family members are paid above market or for minimal work, the excess is an add-back — with documentation.
What Drives a 3x vs. a 6x Multiple?
Two identical plumbing businesses generating $1M EBITDA can get very different multiples. The factors that push you from 3x to 6x are specific and actionable:
| Factor | Low Multiple Signal | High Multiple Signal | Multiple Impact |
|---|---|---|---|
| Service Agreements | Under 10% of revenue | 25%+ of revenue | +0.5–1.5x |
| Owner Dependence | Owner on every call, holds master license | Operations run without owner | +0.5–2x |
| Revenue Size | Under $500K EBITDA | Above $1M EBITDA | +0.5–1x |
| Financial Clarity | Cash transactions, mixed books | 3 clean years, audited or reviewed | +0.25–0.75x |
| Commercial Mix | 100% residential service calls | 30%+ commercial with backlog | +0.25–0.5x |
| Geographic Density | Techs spread across wide territory | Tight route density, fast response times | +0.25–0.5x |
The Gap Analysis: What You'd Get Today vs. What You Could Get
The most important number in your valuation isn't your current multiple. It's the delta between what you'd get selling today versus what you could get in 3–5 years with intentional preparation. For most plumbing owners generating $500K–$2M EBITDA, this gap is $2–6 million — sometimes more.
That gap is the reason the "sell now vs. build first" conversation deserves more than a gut feel. If your current valuation is $3M and disciplined growth could make it $7M in three years, selling today is a $4M decision — and most owners make it without doing the math.
← Back to the Complete Guide: How to Sell Your Plumbing Business All 28 deep-dive guides, valuation tables, buyer comparisons, and more → How to Maximize Your Plumbing Business Value Before Selling The highest-ROI moves to increase your multiple before going to market → Should I Sell My Plumbing Business Now or Wait? The sell-vs-build math for 4 real scenarios, including the minority partner optionAlso in the Lightning Path Guide Series
Own a HVAC business? See our companion guide: What Is My HVAC Business Worth?
DISCLAIMER: The information on this page is provided for general informational and educational purposes only. It does not constitute — and should not be construed as — financial advice, investment advice, legal advice, tax advice, or any other form of professional advice. Nothing on this site creates a professional advisory relationship between you and Lightning Path Partners. Business valuations, transaction structures, and market conditions discussed herein are general in nature and may not apply to your specific situation. Always consult a qualified financial advisor, M&A attorney, business broker, or CPA before making any business or financial decisions. Full Terms of Use →
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