What are construction firms required to keep for project records, and how long after a building is completed?

Construction project records document how a building was designed, permitted, built, and paid for. There is no single nationwide rule that covers every firm. Instead, retention is shaped by a mix of legal exposure, contractual terms, tax rules, and the practical need to defend the structure over its useful life. A sound retention schedule weighs all of these together.

What construction firms typically keep

Project documentation usually falls into a few broad groups:

• Contracts and procurement — the prime contract, subcontracts, purchase orders, change orders, and bonds.
• Design and as-built records — drawings, specifications, shop drawings, RFIs, submittals, and final as-built plans showing what was actually constructed.
• Construction administration — daily logs, inspection and testing reports, permits, and certificates of occupancy.
• Financial and tax records — invoices, payment applications, lien waivers, and supporting accounting.
• Safety and personnel — incident reports, training, and payroll-related records.

How long after completion

Retention periods generally run from a triggering event — most often substantial completion, final payment, or project close-out — rather than from the date a document was created.

Drivers that determine the period include:

• Statutes of limitation and repose. These set the window during which defect, breach, or injury claims can be filed. Periods vary by state and by claim type, and statutes of repose for latent defects can extend well beyond ordinary limitation periods. Confirm the rules in your jurisdiction.
• Tax requirements. The IRS expects records that support income and deductions to be kept long enough to cover the relevant assessment periods.
• Employment recordkeeping. Payroll and wage records carry their own federal minimums under wage-and-hour rules.
• Contract terms. Owners and public agencies often impose retention and audit clauses that exceed statutory minimums.

Because the longest applicable obligation controls, many firms retain core project files — especially as-built drawings and key contracts — for the longer of any contractual term or the relevant repose period, and some retain as-builts permanently for asset and liability purposes.

The practical approach is to build a defensible, documented retention schedule, apply consistent close-out triggers, and suspend disposition under a legal hold when litigation is reasonably anticipated. For broader principles, see the retention and disposition topic hub.