Plumbing companies in Illinois typically sell for 2.5x to 4.5x SDE. Businesses with commercial service contracts, trained licensed crews, and strong residential repeat customer bases command the higher end of the range. Residential-only plumbers with high owner involvement often sell closer to 2x–3x.
Key Valuation Factors
License transferability is critical — buyers need to understand whether the business can legally operate under new ownership, particularly if the owner holds the master plumber's license. Businesses where a key employee holds the required license, or where the buyer is themselves a licensed plumber, resolve this issue cleanly.
Fleet and Equipment
Buyers value well-maintained fleets with vehicles that have useful remaining life. A six-truck operation with newer vehicles is worth more than a similar revenue business with aging, high-mileage trucks. Documented preventive maintenance records help support equipment value during due diligence.
Plumbing businesses with service agreement programs — annual inspections, water heater maintenance plans — typically sell at a premium because recurring revenue reduces buyer risk and improves SBA loan approval odds.
Recast Seller’s Discretionary Earnings, then apply a planning multiple for this Illinois business. Replacement labor is subtracted. This is a planning tool, not an appraisal.
Before debt, working-capital peg, holdback, and tax. Educational only.
How Illinois buyers put a number on how to value a plumbing company
This page is the valuation guide. It is not the sale-process playbook. Seller’s discretionary earnings (SDE) is the cash a full-time working owner can take after you normalize the books. Start with the tax return. Add owner pay and one-time costs. Subtract the wage you must pay to replace the owner.
Plumbing businesses recast on service-agreement and drain-cleaning recurrence, not a single hospital rough-in. Add back owner compensation, then remove new-construction spikes, warranty callbacks, and any unlicensed helper coded as a plumber. If the seller still holds the only Illinois plumber license that lets the company pull permits, subtract a licensed plumber-in-charge before the multiple.
Planning band on this vertical: 3x–5x SDE. That is a range, not a quote. BizBuySell’s Q2 2026 Insight Report showed a 2.7× cash-flow multiple across all reported closed deals. Do not use that marketplace average as this shop’s appraisal.
A worked planning example (illustration)
Illustration only — not a quote for any Illinois shop. A plumbing companie whose tax return shows $217,000 of net profit is not worth $217,000 × a rumor multiple.
Add back the owner’s $143,000 W-2 and payroll tax, $9,500 of discretionary benefits, $12,000 of accepted one-time cost, and $12,000 of personal expenses that a buyer will not run. Then subtract $3,000 of replacement labor if the owner still diagnoses, sells, or closes the books.
Adjusted SDE in this illustration is $390,000. At 4.00x, enterprise value is $1,560,000 before debt, working capital, holdback, and tax.
SDE line items buyers actually use
- Reported net profit (tax return, not the marketing P&L)
- + Interest expense
- + Income taxes (not payroll, sales, or property tax)
- + Depreciation and amortization
- + Owner W-2, bonuses, and payroll taxes on the owner
- + Discretionary owner benefits that a buyer will not keep (auto, personal travel, family on payroll with no role)
- + Accepted one-time or non-recurring expenses
- − Market-rate replacement labor for owner work that will not transfer
- = Seller’s Discretionary Earnings (SDE)
What moves the multiple up or down
- A staying licensed plumber who is not the seller
- Membership or service-agreement recurrence
- Camera and jetting capability that keeps drain work in-house
- Commercial account tenure versus bid-only new construction
- Clean permit and workers-comp history
What does not transfer with the price
Illinois Plumbing License Law is statewide: IDPH issues journeyman and plumber licenses, and the company needs a licensed plumber to pull permits. Chicago runs its own plumbing-license regime on top. The license is personal. It does not ride with the assets. A buyer without a licensed plumber on day one cannot legally operate the book.
Diligence that changes the number
- Who holds the IDPH or Chicago plumber license and whether they stay
- Service-agreement and water-heater-membership count versus bid work
- Municipal permit history and any open violation or failed inspection
- Fleet, camera, hydro-jet, and locate-equipment condition
- Commercial vs residential mix and backflow-certification coverage
- Workers-comp class codes versus actual job mix
When you want the close calendar instead of the math, read how to sell. This page stays on value.
Documents to gather this week
- Three years of signed business tax returns and matching P&Ls
- Year-to-date P&L, balance sheet, and three months of bank statements
- Current lease, amendments, and a plain-English remaining term
- License and permit list, including who holds each card
- Top-customer concentration (names redacted until an NDA)
A simple Illinois close calendar
Plan six to twelve months from cleanup to close on a prepared Main Street deal. Start CBS-1 and any Chicago or Cook notices at letter-of-intent, not the week of funding. Landlord consent often takes longer than the lender.
Related pages on this site
Educational only — not legal, tax, or a formal appraisal. Confirm bulk-sale notices, licenses, and tax allocation with counsel and a CPA.
Questions
No. This is education and planning math. A professional opinion of value is a confidential conversation. We work on a success fee if you engage a sale process. There is no file-upload portal.
Start with the 3x–5x band on this vertical, after you adjust seller’s discretionary earnings. Marketplace-wide 2.7× cash flow from BizBuySell Q2 2026 is not your quote.
Illinois Plumbing License Law is statewide: IDPH issues journeyman and plumber licenses, and the company needs a licensed plumber to pull permits.
Most prepared Main Street sales take about six to twelve months from cleanup to close. License transfers, landlord consent, and SBA underwriting add weeks.
CBS-1 is the Illinois bulk-sale notice. File it at least ten business days before an asset transfer that meets the statute. Late filing can put Illinois tax risk on the buyer.