Open defects shortly before handover put buyers in a difficult position. They may not want to delay the purchase, but they also do not want to pay the full price while a specific defect remains unresolved. A purchase price retention can help.
This post explains when a retention is useful and how it should be drafted. The focus is documentation, amount, deadline, escrow and the distinction from statutory warranty.
A retention does not replace a careful defect review. It is a tool for integrating a known open point into the settlement.