What records do construction companies need to keep for completed projects and how long?

Construction firms generate some of the most varied records of any industry, and a single completed project can produce thousands of documents that carry obligations long after the building is finished. Sound retention starts with identifying what you hold and matching each category to the rule that governs it. For a broader grounding in these concepts, see the fundamentals topic hub.

Common record categories

For a completed project, expect to manage:

• Contract and bid records — the prime contract, subcontracts, change orders, bids, and bonds.
• Project documentation — drawings, plans, specifications, RFIs, submittals, and as-built records.
• Financial records — invoices, payment applications, lien waivers, and job-cost ledgers.
• Tax records — supporting documentation for income, deductions, and depreciation.
• Payroll and employment records — wage, hour, and personnel files, including certified payroll on public work.
• Safety, inspection, and permit records — OSHA logs, inspection reports, and closeout permits.
• Insurance and warranty records — policies, claims, and warranty obligations.

How long to keep them

Retention is driven by why a record exists, not by a single number. A few general principles:

• Tax-related records should generally be kept based on the period during which the records may still be material — the IRS publishes guidance on these timeframes, and many businesses keep tax support for several years at minimum.
• Payroll and wage records are subject to federal recordkeeping rules, such as the Fair Labor Standards Act, in addition to state requirements.
• Project and warranty documents often need to outlive the job because of statutes of limitation and statutes of repose for construction defects, which can extend many years past substantial completion.
• Contract and financial records are typically retained for the life of any potential dispute or audit.

Practical guidance

Because federal, state, contractual, and litigation requirements overlap, the safest approach is a written retention schedule that lists each record type and the longest applicable period. Confirm specifics with legal and tax advisors, suspend disposal under any legal hold, and dispose consistently once retention ends. When periods conflict, keep the record for the longest applicable requirement.