A brand-new home is supposed to be finished, but in practice almost every new build is handed over with a list of small defects, the snags. A snag is any fault or unfinished bit of work: a scuff on a door, a paint run, a gap in the sealant, a loose handle, a tile that is not quite right. None of them are disasters on their own, but they are yours to spot and report.
That is what snagging is: walking your finished home, finding the defects and reporting them to the developer so they get put right. There is usually a window after handover in which the developer is expected to fix reported snags, which is why catching them early and recording them clearly matters so much.
The exact deadlines, what counts as a defect rather than normal wear, and how to escalate if your developer goes quiet all depend on your warranty and the consumer code that covers your home. We have kept this page practical and pointed you to the guides for the detail, rather than guess at specifics that vary from home to home.