The main affordability, deposit and lending criteria can apply to both, but the paperwork and timing may differ. For a new build, the lender may require details of the developer, specifications, valuation and practical completion, while you may also need to budget for snagging and finishes. A second-hand purchase usually involves a standard valuation and survey, though the property's condition can affect lending or costs. Government schemes that support eligible new homes may have separate conditions and limits, which can change, so check the current rules with Revenue or the official scheme website and confirm requirements with your lender.