What closeout paperwork do I need before retention can be released?

Retention releases hang off certificates, and certificates hang off paperwork, so the closeout question is less about when the money falls due and more about assembling the documents that let the certificates issue at all. The two events that open the two halves of retention are practical completion and the making good of defects at the end of the rectification period, each evidenced by its own certificate, and neither issues itself: it has to be asked for and supportable. Practical completion needs the works genuinely complete enough: the completion snag list worked down and the closeout document set, the operation and maintenance manuals, test and commissioning certificates, as-builts and warranties, substantially in, because a payer with an incomplete file has grounds to withhold or defer certifying. The making-good certificate needs the defects notified in the rectification period demonstrably closed, meaning a snag register with evidence of the making good filed against each item rather than a vague assurance it is all done. What loses money at closeout is rarely a dispute about entitlement; it is a payer declining to certify against missing manuals, open snags with no evidence of closure, or an absent making-good certificate nobody chased. Get the paperwork in order, with each certificate pursued the day the work supports it, and the release is administrative; leave it in disorder and the release stalls behind it, however clean the entitlement.

Take a cladding subcontractor whose works finished cleanly but whose closeout did not. When they applied for the first retention release the main contractor pointed to two missing test certificates and a handful of completion snags with no record of repair, and declined to press the certifier for practical completion until the file was whole; the release sat unpaid for months over paperwork, not money. On their next job they treated the documents as the deliverable they are: certificates and warranties collected as the work finished, every completion snag closed with a dated photograph filed against it, and the practical completion inspection booked and chased rather than awaited. The certificate issued on time, the first release followed within the cycle, and a year later the making-good certificate came just as smoothly because the rectification-period snags had been tracked to a documented close. The entitlement was identical either way; only on the second was the paperwork ready to let the money go.