A construction project does not truly end when the building is handed over. Most contracts include a defects liability period, a window after completion during which the contractor remains responsible for putting right defects that appear in the work. This period protects the employer and gives the contractor a defined opportunity to make good problems. Understanding how it works helps both sides manage risk after handover.

What the defects liability period is

The defects liability period, sometimes called the defects notification period, is a set length of time that begins at practical completion of the works. During this period, if defects emerge in the contractor’s work, the employer can require the contractor to return and rectify them.

The period gives the parties a structured way to deal with the small faults and shortcomings that often only become apparent once a building is in use. Rather than leaving disputes to fester, it sets out a clear process and timeframe for making good.

How it works in practice

When a defect appears during the period, the employer or contract administrator typically notifies the contractor and requires it to be remedied within a reasonable time. The contractor is generally obliged to carry out this rectification at its own cost, provided the defect is genuinely due to the contractor’s work rather than, for example, fair wear and tear or misuse.

At the end of the period, once any notified defects have been made good, a final certificate or equivalent is usually issued, marking the point at which the contractor’s rectification obligations under this mechanism come to an end.

Why it matters to contractors

For contractors, the defects liability period is significant for two reasons. First, it defines an ongoing responsibility after completion, so resources may need to be available to attend to defects. Second, it is often linked to the release of retention money.

Retention is a portion of the contract sum held back by the employer as security. A part of it is commonly released at practical completion, with the balance released at the end of the defects liability period once defects have been remedied. This gives contractors a strong incentive to respond promptly to defect notifications.

Why it matters to employers

For employers, the period provides valuable protection. It ensures that the party responsible for the work remains on the hook to fix problems for a defined time, without the employer having to prove a separate breach of contract for every minor fault. It is a practical, built-in remedy.

Employers should make sure defects are identified and notified properly within the period, because the mechanism generally depends on defects being raised in the correct way and within the timeframe.

The limits of the defects liability period

It is important to understand that the defects liability period is not necessarily the end of all liability for defective work. Depending on the contract and the law, an employer may still have rights in respect of defects that emerge later or that amount to a more fundamental breach. The defects liability period is a specific contractual mechanism, not always a complete cut-off of all possible claims.

Because the interaction between the defects liability period, retention, and wider legal rights can be complex, both contractors and employers benefit from understanding their position clearly, particularly where significant defects or sums are involved.