Due Diligence Guide · Window Cleaning

Due Diligence Checklist for Buying a Window Cleaning Business

Verify recurring revenue, crew retention risk, and equipment condition before you commit to any window cleaning acquisition.

Find Window Cleaning Acquisition Targets

Window cleaning businesses trade at 2.5–4x SDE and attract SBA financing, but recurring revenue quality and owner dependency are the two variables that move price most. Rigorous due diligence separates a durable route-based business from a glorified solo operator.

Window Cleaning Due Diligence Phases

01

Financial Verification

Confirm that reported SDE is real, recurring, and not dependent on a handful of large accounts that could walk after closing.

Reconcile 3 Years of Tax Returns to P&Lcritical

Cross-reference tax returns, profit and loss statements, and bank deposits to identify unreported cash, add-backs, or co-mingled personal expenses that distort true SDE.

Break Down Revenue by Contract vs. One-Time Jobscritical

Request a job-by-job revenue report segmented by recurring commercial contracts, residential routes, and one-time calls to validate the percentage of predictable revenue.

Identify Customer Concentration Riskcritical

List the top 10 accounts by revenue. If any single client exceeds 15% of total revenue, flag it for earnout structuring or purchase price adjustment.

02

Operational Assessment

Evaluate whether the business can run without the owner and whether the crew, equipment, and systems will survive a transition.

Audit Crew Licensing, Insurance, and Safety Recordscritical

Verify that all crew members hold required certifications, that general liability and workers comp policies are current, and that OSHA safety logs are documented.

Inspect Vehicle Fleet and Equipment Conditionimportant

Review age, mileage, and maintenance records for all work vans and water-fed pole systems. Budget replacement capital for any asset within 12–18 months of end-of-life.

Evaluate CRM and Scheduling Softwareimportant

Confirm the business uses route management or scheduling software with complete customer records. A paper-based operation adds transition risk and integration cost.

03

Transition and Deal Structure

Assess owner dependency, validate that key relationships transfer, and align deal structure to identified risks before issuing a final LOI.

Map Owner Involvement in Daily Operationscritical

Determine what percentage of revenue the owner personally services or sells. High owner dependency justifies a longer training period and seller note tied to retention milestones.

Review All Commercial Contracts for Transferabilitycritical

Read every recurring commercial contract for assignment clauses, cancellation windows, and auto-renewal terms before assuming revenue will survive closing.

Confirm SBA Eligibility and Lender Requirementsimportant

Verify the business meets SBA 7(a) eligibility — clean financials, no outstanding tax liens, and sufficient SDE to cover debt service at 1.25x DSCR minimum.

Window Cleaning-Specific Due Diligence Items

  • Request a route density map showing account locations to verify geographic concentration and estimate windshield time costs per crew.
  • Confirm whether the business holds any high-rise or rope-access certifications, as these create real barriers to entry and support premium pricing.
  • Ask for seasonal revenue breakdown by quarter to identify Q4 cash flow gaps common in northern climates and assess off-season service diversification.
  • Verify that all chemical handling and water discharge practices comply with local environmental regulations, particularly for commercial properties.
  • Review online reputation — Google rating, review volume, and review recency — as inbound leads and customer trust transfer with the brand, not the owner.

Frequently Asked Questions

What SDE multiple should I expect to pay for a window cleaning business?

Most window cleaning businesses trade at 2.5–4x SDE. Businesses with high recurring commercial contract revenue, low owner dependency, and diversified customers command the upper end of that range.

How do I verify that recurring revenue is real and will survive the sale?

Request a contract register with renewal dates and cancellation terms, then cross-reference against actual invoiced revenue. Follow up directly with top commercial accounts during late-stage due diligence.

Can I use SBA financing to buy a window cleaning business?

Yes. Window cleaning businesses are SBA 7(a) eligible. Expect to inject 10% equity, with the loan covering 80–90% of the purchase price, assuming clean financials and sufficient SDE to service debt.

What is the biggest deal killer in window cleaning acquisitions?

Owner dependency combined with customer concentration. If the owner personally services the top three accounts representing 40%+ of revenue, you face compounding transition risk that no earnout fully mitigates.

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