The description “unmortgageable” should prompt a question: which lender, product and property issue does it refer to? Treat it as a reason to investigate rather than a complete explanation.
Ask for the specific concern
Establish whether the issue relates to condition, construction, title, occupation or the intended use. Obtain the available documents and explain the property accurately to an authorised mortgage adviser. Do not assume that one missing feature is the only obstacle.
Read the relevant criteria
Lenders publish property criteria, but those rules apply to their own lending. Nationwide's intermediary guidance, for example, contains specific property and construction conditions. It is not a universal approval list for every mortgage provider or a recommendation to use a particular lender.
Check proposed solutions independently
If a seller suggests that a repair or legal change will resolve the issue, ask the relevant professionals to assess it. Obtain a written scope and costs for works, and ask the lender what evidence it would require. Spending money does not itself guarantee a successful valuation or offer.
Avoid a funding gap
Before committing to buy, understand when funds would be available and what conditions remain. Consider the consequences if finance is delayed or declined. Specialist borrowing can carry different risks and costs; discuss the full terms with an appropriately authorised adviser rather than treating it as an automatic workaround.
Editorial review: 14 October 2026. This original Property Perpetuity guide replaces the imported text; the original archive publication date is retained.