Due Diligence Guide · Construction

Due Diligence Checklist for Acquiring a Construction Company

Validate backlog quality, bonding capacity, job cost history, and contingent liabilities before closing on a specialty or general contractor.

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Acquiring a construction business requires scrutiny well beyond standard financial review. Project-based revenue, percentage-of-completion accounting, and deep owner involvement create risks unique to this industry. This guide walks buyers through three critical phases covering financials, operations, and legal exposure specific to lower middle market contractors.

Construction Due Diligence Phases

01

Financial & Backlog Analysis

Validate the quality of reported earnings and future revenue by examining job cost records, WIP schedules, and margin consistency across project types.

Review 3 Years of Job Cost Reportscritical

Confirm gross margin by project type, identify cost overrun patterns, and assess estimating accuracy. Look for inconsistencies between bids and actuals that signal weak cost controls.

Analyze the WIP Schedule and Backlogcritical

Review signed contracts, stage of completion, projected margins, and billing status. Confirm backlog is real, contracted, and not contingent on relationship-based verbal commitments.

Normalize Owner Compensation and Add-Backsimportant

Identify personal expenses, above-market owner salary, and non-recurring costs. Construction sellers frequently run vehicles, insurance, and family payroll through the business.

02

Operational & Licensing Review

Assess operational continuity risk by examining licenses, bonding capacity, subcontractor reliability, and the owner's role in day-to-day project execution.

Verify State Licenses and Transferabilitycritical

Confirm all contractor licenses are active, in good standing, and transferable to a new owner or entity. Some states require re-application, which can delay closing or operations.

Evaluate Bonding Capacity and Surety Relationshipscritical

Review current bonding limits, open bonds, and the surety's willingness to extend capacity to a new owner. Loss of bonding access can disqualify the company from key projects.

Assess Subcontractor and Labor Relationshipsimportant

Identify reliance on specific subs, any union or prevailing wage obligations, and whether key field personnel will remain post-close without the seller present.

03

Legal & Contingent Liability Review

Identify hidden liabilities from past projects including active disputes, warranty exposure, mechanic's liens, and any unresolved compliance or insurance claims.

Search for Liens, Claims, and Active Disputescritical

Run lien searches on completed projects and review any litigation, arbitration, or contractor board complaints. Past disputes signal estimating problems or poor project management.

Review Insurance History and Loss Runsimportant

Request 5 years of general liability and workers comp loss runs. Frequent claims or experience modification rates above 1.2 can increase post-close insurance costs significantly.

Confirm Contract Assignment and Client Transferabilityimportant

Review key client contracts for assignment clauses. Determine whether top clients have personal relationships with the seller that may not survive an ownership transition.

Construction-Specific Due Diligence Items

  • Confirm that the surety bonding company has agreed in principle to extend bonding capacity to the new ownership structure before signing a purchase agreement.
  • Request a project close-out log showing final versus estimated margins on the last 20–30 completed jobs to validate estimating accuracy and catch hidden losses.
  • Verify that all subcontractors on active projects have been paid current and that no conditional or unconditional lien waivers are outstanding on open jobs.
  • Assess whether the seller holds any licenses in their personal name rather than the company entity, which may require the buyer to obtain new licenses before operating.
  • Evaluate workers compensation experience modification rate (EMR) history over 3 years — a rising EMR signals safety culture issues and will increase post-close insurance premiums.

Frequently Asked Questions

What is the biggest financial risk when acquiring a construction company?

Hidden losses in active projects. Percentage-of-completion accounting can overstate earnings if cost overruns have not yet been recognized. Always audit open job cost reports and compare to billing status.

How do SBA loans work for buying a construction business?

SBA 7(a) loans cover up to 90% of the purchase price with 10% buyer equity. Sellers often carry a note for any valuation gap. Bonding history and clean financials are essential for lender approval.

What multiple should I expect to pay for a specialty contractor?

Lower middle market construction companies typically trade at 2.5x–4.5x EBITDA. Premiums apply for recurring revenue components, strong backlog, second-tier management, and diversified client bases.

How do I evaluate whether the backlog will survive under new ownership?

Review whether contracts are written and assignable, then assess how much revenue depends on the seller's personal relationships. Structured earnouts tied to backlog conversion help bridge this transition risk.

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