Final Account Process in Construction: A Practical Guide

The final account is the last financial settlement between the parties on a construction project. It confirms the total value of work carried out, including variations, claims, and any deductions. Getting the final account right protects your margin and avoids drawn-out disputes after the work is done. This guide explains the process, common pitfalls, and what you need to prepare.

What Is a Final Account?

A final account is the agreed total value of the contract after all work is complete. It accounts for the original contract sum, agreed variations, provisional sums, daywork, claims, and any contra charges or deductions. The final account closes the financial relationship between the parties on a specific contract or subcontract.

• Captures the total value of all work including variations and claims
• Accounts for provisional sums, prime cost sums, and adjustments
• Deducts any contra charges, liquidated damages, or defect rectification costs
• Should reconcile against all interim payment applications submitted during the project
• Once agreed, it represents the final financial settlement between the parties

Typical Final Account Timeline

The timing depends on the contract form. Under JCT contracts, the contractor typically submits final account documentation within 6 months of practical completion. Under NEC contracts, the project manager assesses the final amount due. In practice, final accounts often take 6 to 18 months to agree, and complex projects can take longer.

• JCT: contractor submits within 6 months of practical completion (check your contract)
• NEC: project manager assesses the final payment within timescales defined in Contract Data
• Bespoke contracts: check the specific final account clause for timescales
• In practice, delays are common when documentation is incomplete or disputed
• Interest may accrue on overdue amounts under the Late Payment of Commercial Debts Act

What to Include in Your Final Account Submission

A well-prepared final account submission saves time and reduces disputes. Include everything the other party needs to assess the account without chasing you for backup. Incomplete submissions are the single biggest cause of delay.

• Original contract sum and any agreed adjustments
• Schedule of all variations with supporting instructions or confirmations
• Provisional sum adjustments with evidence of actual costs
• Daywork records with timesheets and material invoices
• Claims for loss and expense with supporting records
• Summary of all interim valuations and payments received
• Statement of retention held and release dates
• Schedule of any contra charges or deductions with the basis for each

Common Final Account Disputes

Most final account disputes arise from poor documentation during the project. Variations that were instructed verbally but never confirmed in writing, daywork that was not signed off at the time, and claims submitted months after the event are all common flashpoints.

• Disputed variations: verbal instructions without written confirmation
• Daywork records rejected because they were not signed at the time
• Claims for delay or disruption submitted without contemporary records
• Disagreements over the valuation of measured work
• Contra charges disputed because the basis was not communicated earlier
• Retention release delayed beyond the contractual defects period

How to Avoid Final Account Problems

The best final accounts are the ones where nothing is a surprise. If you track variations, confirm instructions, and keep records throughout the project, the final account becomes an administrative exercise rather than a negotiation.

• Confirm all variation instructions in writing before carrying out the work
• Submit daywork records for signature within 7 days of the work
• Include claims and notices in interim applications as they arise
• Maintain a live final account tracker throughout the project
• Reconcile interim payments against your expected final account regularly
• Use software to keep all backup documentation linked to the relevant line items