Security guard services sell for 2.0x to 3.5x SDE (Seller's Discretionary Earnings) or 4.0x to 6.5x EBITDA, measuring earnings before interest, taxes, depreciation, and amortization from recurring guard labor billing, patrol operations, and technology service revenue. Firms with durable multi-year contracts, diversified clients, low guard turnover, integrated service offerings, and delegated operations consistently achieve the upper range. The valuation spread reflects contract quality, customer retention, and operational structure that buyers evaluate when pricing acquisitions.

Multi-year contracts create predictable revenue and reduce customer acquisition friction. Security contracts of three-plus years with 3-5% annual rate escalations locked in at award provide visibility allowing buyers to forecast normalized earnings. One-year or month-to-month arrangements create renewal pressure requiring continuous sales effort and prevent rate optimization. A firm with $2M annual revenue (60% three-year contracts, 30% two-year, 10% one-year) has $1.4M locked in multi-year agreements, providing stability attractive to recurring revenue buyers. Contract duration directly affects valuation multiple because longer terms reduce buyer risk of customer loss or price compression post-acquisition, similar to service contract analysis in our alarm security monitoring business valuation guide.

Client diversification reduces concentration risk and demonstrates repeatable sales model. Buyers require no single account exceeding 15% of annual revenue, typically screening for top-five accounts representing less than 50% of revenue. A security firm with 40 accounts averaging $50,000 annually demonstrates strong diversification, while concentration above 25% from three large accounts creates valuation risk. Customer concentration above 15% reduces multiples by 0.5x-1.0x because loss of major customers materially impacts earnings.

Guard retention below 25% annual turnover improves profitability and client satisfaction. Security industry averages 40-50% annual guard turnover, creating recruiting pressure and $3,000-5,000 training cost per guard. Low-turnover firms with 15-20% churn develop experienced teams, reduce training burden, and create client relationships based on familiar personnel. Training cost reduction flows directly to EBITDA because cost-per-dollar-of-revenue improves. A 20-guard firm with 50% turnover replaces 10 guards at $40,000 annual training cost versus 15% turnover at $12,000, creating $28,000 cost advantage. Buyers apply 1-2% EBITDA improvement for below-industry retention.

Service mix diversity including guards, patrol, technology integration, and ancillary services improves margins and customer switching costs. Firms offering only guard labor face commoditized pricing pressure and 25-35% gross margins, while integrated service providers command 40-50% margins. Technology services including access control, video monitoring, and alarm response generate 40-60% gross margins versus guard labor at 25-35%. A firm with 60% revenue from guard labor ($1.2M) and 40% from technology services ($800K) generates $760K total gross profit. Buyers value service integration because customer lifetime value and switching costs improve. Our low-voltage access control business valuation guide details technology service margin characteristics similar to integrated security operations.

State licensing, background check compliance, bonding, and insurance compliance create regulatory protection. Security firms require Private Investigator licenses, guard certifications, E&O insurance, and documented training records. Companies with complete compliance, clean regulatory history, and proactive licensing maintenance command premium valuations because compliance creates switching costs and barriers to entry. Non-compliant firms with lapsed licenses, pending violations, or training documentation gaps receive 20-30% valuation discounts pending remediation.

Owner role in sales and client relations determines operational continuity and buyer integration burden. Owners personally managing major accounts create acquirer dependency requiring retention agreements and customer transition management. Firms with dedicated sales management, documented relationship procedures, and non-owner account contacts demonstrate transferable operations and command premium valuations. Owner-dependent firms receive 2.0x-2.5x SDE while professionally managed firms achieve 3.0x-3.5x because professional structure reduces transition risk.

Adjusted SDE normalizes owner compensation and discretionary expenses to establish repeatable earnings. A firm with $2M annual revenue, $1.4M guard labor costs, $300K overhead, and $200K owner compensation has $100K adjusted SDE valuing at 2.5x or $250,000. A comparable firm with identical operations plus 70% multi-year contracts, <10% client concentration, 20% guard retention, integrated technology services, and non-owner sales management might command 3.3x or $330,000.

The buyer landscape includes national security operators at 3.0x-3.5x SDE acquiring regional platforms, PE consolidators at 2.5x-3.2x building multi-region networks, insurance-linked investors at 2.5x-3.0x seeking recurring service revenue, and independent operators at 2.0x-2.5x expanding geographic reach. National operators pay top multiples because acquired firms integrate existing technology platforms, administrative infrastructure, and vendor relationships, creating operational synergies and margin expansion.

Adjusted EBITDA normalizes owner compensation, vehicle allowances, and discretionary expenses through the business. A security guard company generating $3M annual revenue with $300K adjusted EBITDA at 5.5x values at $1.65M. A comparable company with multi-year contracts, diversified client base, and below-industry guard turnover might command 6.5x, or $1.95M — the $300K premium reflects contract security and workforce stability that reduces post-acquisition operational risk. Related industries that follow similar consolidation dynamics include Alarm / Security Monitoring, Low Voltage / Access Control, and Fire & Water Restoration.