Verify recurring contracts, crew stability, equipment condition, and true owner dependency before you commit to a purchase price.
Buying a window cleaning business offers predictable recurring revenue, low capital intensity, and strong SBA financing eligibility — but the risks are real. Revenue can be inflated by one-time jobs, customer concentration among a handful of commercial accounts can threaten post-close cash flow, and an owner-operator who handles quoting, crew management, and key client relationships creates serious transition risk. This checklist walks you through the five critical due diligence categories specific to window cleaning acquisitions: financial verification, customer and contract analysis, workforce and operations, equipment and vehicles, and owner transition risk. Work through every item before finalizing your LOI or purchase agreement.
Confirm that reported revenue and SDE are accurate, recurring, and sustainable — not inflated by one-time project work or undocumented cash.
Reconcile 3 years of tax returns to P&L statements and bank deposits
Confirms reported income is real and not inflated by undeposited or unreported cash.
Red flag: Significant gaps between tax returns and P&L revenue lines without clear explanation.
Separate recurring contract revenue from one-time or seasonal job revenue
Recurring revenue drives valuation; one-time jobs do not justify the same multiple.
Red flag: Less than 30% of revenue is tied to recurring contracts or scheduled service agreements.
Review accounts receivable aging report for commercial clients
Slow-paying commercial accounts inflate revenue and signal potential collection problems.
Red flag: More than 15% of AR is over 60 days past due from commercial property clients.
Identify all owner add-backs and confirm each is legitimate and non-recurring
Inflated SDE from aggressive add-backs directly overstates the business's true earnings.
Red flag: Add-backs exceed 20% of stated SDE or include items that will continue post-sale.
Assess the stability, concentration, and transferability of the customer base — especially recurring commercial and HOA accounts.
Request a full customer revenue report showing top 10 accounts by annual spend
Identifies concentration risk that could devastate cash flow if one account exits post-close.
Red flag: Top 3 commercial accounts represent more than 40% of total annual revenue.
Review all recurring service contracts for renewal terms, notice periods, and transferability
Contracts that aren't assignable or have short notice periods can evaporate at closing.
Red flag: Key commercial contracts are verbal agreements or contain non-assignment clauses.
Calculate annual customer retention rate using prior 2 years of revenue data
High churn in window cleaning signals pricing, quality, or service delivery problems.
Red flag: Year-over-year residential or commercial client retention falls below 75%.
Confirm whether the owner personally manages key commercial property manager relationships
Relationships held by the owner — not the brand — are high departure risk post-close.
Red flag: Multiple top-10 accounts deal exclusively with the owner and have never met crew leads.
Evaluate crew stability, licensing compliance, safety records, and whether documented systems allow operations to run without the owner.
Verify current certificates of insurance, workers' comp coverage, and crew safety training records
Gaps in coverage create immediate liability and can disqualify the business from commercial contracts.
Red flag: Lapsed workers' comp policy or no documented safety training for ladder and lift equipment use.
Review employee tenure, pay structure, and any signed non-solicitation agreements
Tenured crews with fair compensation are far less likely to leave or take clients post-sale.
Red flag: Average crew tenure under 12 months or crew members working as 1099 contractors improperly.
Confirm the business uses a CRM or route scheduling platform with complete customer records
A documented CRM protects route density and customer data if key employees depart post-close.
Red flag: All scheduling is managed in the owner's head, personal phone, or an unorganized spreadsheet.
Request written SOPs for quoting, scheduling, crew deployment, and safety protocols
Documented SOPs reduce owner dependency and support a smoother operational handoff.
Red flag: No written procedures exist for any core operational process beyond informal tribal knowledge.
Assess the condition, age, and replacement cost of all vehicles, water-fed poles, lifts, and specialized window cleaning equipment.
Obtain a full equipment and vehicle inventory with age, mileage, and maintenance history
Deferred maintenance and aging fleet directly reduce post-close cash flow through surprise capex.
Red flag: Primary service vehicles exceed 150,000 miles with no documented maintenance records on file.
Inspect water-fed pole systems, pure water tanks, and high-reach equipment for functionality
Specialized equipment failures halt commercial jobs and damage client relationships immediately.
Red flag: Water filtration systems or WFP rigs are outdated, non-functional, or require immediate replacement.
Confirm all vehicles are titled in the business name and transferable in an asset sale
Vehicles titled personally complicate the asset purchase and may trigger financing issues.
Red flag: Multiple vehicles are personally titled to the owner with no plan for clean transfer at closing.
Estimate 12-month capital expenditure needs based on equipment condition findings
Unplanned capex in year one erodes SDE and can strain SBA loan debt service coverage.
Red flag: Estimated equipment replacement costs exceed 15% of the acquisition price within 18 months.
Determine how deeply the business depends on the owner and whether a structured transition can protect revenue and crew stability.
Map all tasks currently performed by the owner versus delegated to crew or staff
Owner-performed tasks that aren't transitioned represent direct revenue and operational risk.
Red flag: Owner handles quoting, scheduling, crew dispatch, AND top client relationships simultaneously.
Negotiate a 6–12 month transition and training agreement tied to the purchase agreement
A structured transition period protects customer retention and crew confidence during handoff.
Red flag: Seller insists on a transition period under 60 days with no earnout or retention mechanism.
Interview 2–3 key crew leads to assess willingness to stay post-acquisition
Crew lead departures post-close can trigger customer attrition on recurring commercial routes.
Red flag: Crew leads are unaware a sale is being considered or have discussed leaving with the owner.
Assess whether the business has ever operated for 2+ weeks without the owner present
Proven owner absence tolerance signals the business can actually run without them post-close.
Red flag: Owner has never taken a vacation longer than 3 days without fielding operational calls daily.
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Window cleaning businesses typically trade at 2.5x to 4x SDE. Businesses at the high end have strong recurring commercial contracts, diversified customer bases, tenured crews, and minimal owner dependency. Deals with heavy customer concentration, seasonal revenue, or owner-operator risk price closer to 2.5x. Always verify the SDE calculation independently before accepting a listed multiple.
Yes. Window cleaning businesses are SBA 7(a) eligible when they have clean financials, 2–3 years of tax returns, and sufficient debt service coverage. Most deals are structured with 80–90% SBA financing, a 10% buyer equity injection, and occasionally a seller note covering a small portion of the balance. Lenders will scrutinize revenue quality — recurring contract revenue is viewed more favorably than one-time job revenue.
Request a customer-level revenue report for the past 3 years and cross-reference it against signed service agreements, renewal invoices, and bank deposits. Filter out jobs coded as one-time, seasonal, or project work. Calculate what percentage of current-year revenue came from customers also present in years one and two. Anything under 70% year-over-year retention deserves a deeper explanation from the seller.
This depends entirely on the contract language. Many commercial window cleaning contracts are with property managers or facilities directors — not the business owner personally — and will transfer with the business in an asset sale if the buyer is qualified and the contract has an assignment clause or no restriction. Verbal agreements and owner-relationship-dependent accounts carry the highest departure risk and should be addressed in the transition plan and potentially tied to an earnout.
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