The profit and loss statement—commonly called the P&L or income statement—is the most examined document in any home services business acquisition. Yet many owners and buyers alike treat it as a black box, focusing only on the bottom line without understanding what drives it. In this article, we break down each major section of the P&L for HVAC, plumbing, electrical, and other trades businesses, explaining what healthy benchmarks look like and what red flags buyers should watch for.
Revenue: The Top Line That Sets the Stage
Revenue for a home services business typically falls into two broad categories: service revenue and project or installation revenue. Service revenue includes maintenance agreements, diagnostic calls, and repair work that generates recurring or semi-recurring income. Project revenue comes from larger one-time installations, remodels, or specialty jobs that may not recur year over year.
Buyers prefer businesses with a higher percentage of service revenue because it tends to be more predictable. When evaluating a P&L, look at the revenue breakdown by category, not just the total. A plumbing business generating $1.2 million in annual revenue with 60% coming from maintenance contracts is worth more at the same multiple than one generating $1.2 million primarily from project work that could vary significantly from year to year.
Revenue concentration is another critical factor. If the top five customers represent more than 20% of total revenue, that is a red flag. A single large commercial customer leaving could dramatically impact the bottom line. Buyers want to see a diversified customer base with no single customer accounting for more than 10-15% of total revenue.
Cost of Goods Sold (COGS): Where Margins Are Made or Lost
COGS for a home services business includes direct labor costs, materials used on jobs, subcontractor fees, and equipment costs directly tied to service delivery. Understanding COGS is critical because it directly affects gross margin—the difference between what you charge and what it costs to deliver the service.
Labor costs typically represent the largest component of COGS for labor-intensive trades like HVAC and plumbing. A healthy labor cost ratio falls between 35% and 45% of revenue for well-run operations. If labor exceeds 50% of revenue, the business may struggle to maintain acceptable profit margins without pricing adjustments.
Materials and parts are the second major COGS component. Well-managed HVAC and plumbing businesses typically see materials costs in the 15% to 25% range of revenue. Excessive materials costs can indicate pricing problems, inefficient routing, or waste. Buying parts at better volumes through supplier relationships can improve this line significantly.
Subcontractor costs, when used, should be tracked separately. Using subcontractors can be efficient but also introduces quality control and reliability risks. Buyers should understand the ratio of employee technicians to subcontractors and whether key subcontractors would continue working with a new owner.
Gross Profit and Gross Margin: The First Key Metric
Gross profit is calculated by subtracting COGS from revenue. Gross margin is that number expressed as a percentage of revenue. For home services businesses, target gross margins typically fall between 45% and 60%, depending on the trade and service mix.
HVAC businesses that combine installation with service often see gross margins in the 45% to 55% range, while pure service businesses with strong maintenance contract portfolios can achieve margins above 60%. Plumbing businesses typically see margins in the 40% to 50% range for service work, with installation projects potentially lower.
Consistency matters as much as the margin itself. A business with a stable 50% gross margin over three years is more attractive than one swinging between 40% and 60% depending on the mix of work. Buyers and lenders both want to see predictable, sustainable margins rather than peak performance that might not repeat.
Operating Expenses: The Overhead That Defines Profitability
Operating expenses—often called overhead—include everything it costs to run the business that is not directly tied to specific jobs. These typically include salaries for administrative staff, marketing and advertising, insurance, rent or lease payments, utilities, vehicle expenses, tools and equipment maintenance, professional services, and licensing and permits.
For a well-run Illinois home services business, total operating expenses should fall between 30% and 40% of revenue. The largest single overhead item is usually administrative labor—office managers, dispatchers, receptionists, and bookkeeping staff. Many small operations keep this lean with just one or two administrative employees, while larger operations may have a full office staff.
Marketing expenses vary widely. A business spending 3% to 5% of revenue on marketing that generates consistent leads is in better shape than one spending 8% on ineffective campaigns. Understanding the source of leads—organic search, pay-per-click, referrals, repeat customers—helps buyers evaluate marketing efficiency.
Insurance is a significant and often overlooked expense for trades businesses. General liability, commercial auto, workers compensation, and professional liability insurance can collectively cost tens of thousands of dollars annually. Illinois businesses face particular workers compensation considerations depending on their trade and claims history.
Net Operating Income: The True Profit Measure
Net operating income, or NOI, is gross profit minus operating expenses. This is the profit the business generates from its core operations before interest, taxes, and non-recurring items. NOI is what lenders focus on most heavily when evaluating financing for a home services acquisition.
A healthy net operating income for an Illinois home services business typically falls in the 10% to 20% of revenue range. A 15% NOI is considered solid; anything above 20% suggests excellent cost management and pricing discipline. Businesses consistently below 10% NOI may struggle to service debt on an acquisition loan while still generating reasonable owner compensation.
When analyzing NOI, look at the trend over three to five years. Is it growing with revenue, or is it shrinking as the business scales? A business that grows revenue but sees NOI decline is a warning sign that overhead is scaling faster than revenue—a common problem as businesses add staff and infrastructure they do not need.
Seller's Discretionary Earnings (SDE): The Valuation Multiplier
Seller's Discretionary Earnings is the metric most commonly used to value small to mid-sized home services businesses. SDE starts with net operating income and adds back the owner's salary, benefits, and perks that a new owner might not replicate. This represents the total economic benefit available to a single owner-operator buyer.
The add-backs typically include the owner's base salary, health insurance premiums paid for the owner and family, vehicle personal use portion, retirement contributions, meals and entertainment classified as business expenses, and any other personal expenses run through the business. These items can add $80,000 to $200,000 or more back to NOI for owner-operated trades businesses.
Understanding SDE is critical for both buyers and sellers. Sellers want to maximize legitimate add-backs to show a higher number and justify a higher asking price. Buyers want to ensure add-backs are reasonable and that a new owner would actually achieve similar savings or would need to replace those benefits with actual expenditures. Overstating SDE through unrealistic add-backs is one of the most common valuation mistakes in the home services broker space.
Red Flags Every Buyer Should Watch For
Experienced buyers learn to spot problems in P&L statements that novice buyers miss. One major red flag is revenue that grows dramatically in the final months before sale. Sellers under pressure to sell sometimes accelerate billing, push through late-quarter work, or otherwise inflate short-term revenue that will not hold post-closing. Look for seasonal patterns and compare trailing twelve-month figures against prior years.
Another warning sign is COGS that is suspiciously low. A business claiming 25% labor costs when the industry norm is 40% likely has either undocumented labor, misclassified expenses, or aggressive accounting. Verify COGS against field reports, time tracking data, and general ledger details.
Operating expenses that seem too lean can also signal problems. A business claiming only 20% overhead likely has expenses being run through other entities, deferred maintenance, or owner work being performed without proper compensation. Every dollar of deferred maintenance becomes a buyer cost post-closing.
Finally, watch for inconsistent accounting methods. A business switching from cash to accrual basis, changing depreciation schedules, or reclassifying expenses between years makes it impossible to compare performance over time. Ask for three years of consistent financials prepared by the same accountant using the same methods.
Getting Your P&L Ready for Sale or Acquisition
If you are preparing to sell your home services business, getting your P&L in order should be one of your first steps. Organize three years of tax returns and financial statements, ideally prepared by a CPA familiar with trades businesses. Correct any obvious inconsistencies or errors.
Consider having a formal valuation done before listing. A broker or analyst can identify weak spots in your P&L and suggest corrections that could improve your valuation by tens of thousands of dollars. Simple changes like reclassifying certain expenses or demonstrating legitimate add-backs can meaningfully impact the SDE calculation.
For buyers, requesting full financial statements—preferably audited or reviewed by a CPA—is essential. Ask for monthly breakdowns rather than just annual summaries so you can spot seasonal patterns. Request the general ledger to verify that expenses are properly categorized. Consider hiring a financial due diligence specialist to analyze the P&L if you are not comfortable doing so yourself.
The Bottom Line
The P&L statement tells the story of your home services business in numbers. Understanding each section—revenue, COGS, gross margin, operating expenses, NOI, and SDE—gives both buyers and sellers the information they need to negotiate from a position of knowledge. Whether you are preparing to sell your HVAC company in Naperville or acquiring a plumbing business in Rockford, mastering the P&L is the first step to a successful transaction.
If you want a no-obligation review of your P&L or help understanding what your home services business might be worth in the current Illinois market, reach out for a free consultation. We have guided hundreds of trades business owners through the valuation and sale process across Chicagoland, the collar counties, and downstate Illinois.