Defects Liability Period: What It Covers and What It Does Not

Why it matters on a project

Buildings reveal their defects over time, not on handover day. A facade that leaks only in driving rain, air conditioning that cannot cope on the hottest week, a floor that lifts after a few months of traffic — none of these show up at a snagging inspection.

The defects liability period exists to keep the contractor responsible for long enough that those things emerge while someone is still obliged to fix them.

What sits inside and outside it

Inside	Outside
Faulty workmanship in the contractor's scope	Normal wear and tear
Materials not as specified	Damage caused by the occupier
Installation defects	Client alterations after handover
Items that fail because they were fitted wrongly	Consumables — lamps, filters, batteries
Work that does not perform as the contract required	Routine maintenance the client agreed to do

The boundary is the usual source of dispute, and it is decided by the contract, not by general fairness.

Length is a commercial decision, not a standard

Periods vary by contract and by trade — and different elements can carry different periods within the same project, particularly where a specialist subcontractor or a manufacturer's terms apply.

Two things worth thinking about when the length is set:

• Does it span the season that will test the building? A period ending before the first monsoon will not surface a facade leak.
• Does it match the manufacturer warranties on major items? A gap between the two leaves the client exposed in the middle.

How to run it properly

• Keep one log of defects, with dates, photographs and locations.
• Report in writing, promptly. Attribution gets harder as time passes.
• Distinguish defects from maintenance items as you record them — mixing the two weakens the whole list.
• Inspect deliberately before the period ends, rather than letting it lapse.
• Confirm in writing when items are made good, so the record closes cleanly.

Common mistakes

• Treating it as a maintenance contract. It is not, and expecting it to be produces friction quickly.
• Saving up defects for the end. Late reporting invites the argument that the cause was use, not workmanship.
• Letting the period lapse without a final inspection. The remaining retention and the obligation usually go with it.
• Assuming one period covers everything. Specialist works and manufacturer warranties often run on different terms.
• No written record. Verbal reports are the weakest possible position if the matter is ever contested.

Standards referenced

Administrative provisions covering contracts and responsibilities appear in NBC 2016, Part 2. The defects liability period is a contractual mechanism — its length, scope, exclusions and the handling of retention are set by the project's contract and should be confirmed with legal advice.