Sectional Completion

Sectional completion is a contractual provision in construction contracts that allows different parts of a project to be formally handed over at different dates, each with its own completion certificate, retention release, and start of the rectification period. Rather than treating the entire project as a single completion event, the works are divided into defined sections, each with its own agreed programme and commercial consequences.

It is most commonly used on large or phased projects - a multi-block residential development, a fit-out spanning multiple floors of an occupied building, or a campus where one facility must be operational before work begins on another. For the client, sectional completion enables early occupation of finished areas while construction continues elsewhere. For the contractor, it triggers partial retention release and ends liability for liquidated damages on each completed section.

Sectional Completion vs. Partial Possession

These two terms are frequently confused but are legally distinct. Sectional completion is pre-agreed and written into the contract before work starts. Each section has a defined scope, its own programme dates, its own liquidated damages rate, and a specified retention percentage. The contract documents - typically the JCT Contract Particulars or NEC Contract Data - must explicitly list the sections for sectional completion to have contractual force.

Partial possession, by contrast, is agreed during the course of the contract. The client and contractor agree that the client can occupy part of the works before it has formally reached completion, without that arrangement having been planned in the original documents. Because partial possession is unplanned, the commercial consequences - particularly around retention release, insurance, and liquidated damages apportionment - are harder to resolve cleanly and more likely to generate disputes.

Practical Consequences for Contractors

When a section reaches practical completion, three things happen simultaneously: half of the retention held for that section is released, the rectification period for that section begins, and the contractor's liability for liquidated damages in relation to that section ends. The employer takes responsibility for insuring the works in that section from the date of sectional completion.

Managing sectional completion requires the contractor to track each section as a semi-independent project within the overall contract. Snagging lists, retention records, and programme milestones need to be maintained section by section, not just at the overall project level.

One practical complication is that mechanical and electrical systems often span all sections and cannot be fully commissioned until the entire project is complete. The contract needs to include a re-entry protocol so that contractors can access handed-over sections to complete outstanding M&E work, without the client treating that access as a breach of the handed-over condition.