How can I determine if my fixed term mortgage is portable?

A fixed term mortgage is portable when the lender allows the existing mortgage product, or part of it, to be transferred to a different property when you move. To determine whether yours is portable, establish the precise conditions for transferring it, the amount that can move and the financial consequences if your sale and purchase do not fit those conditions.

Start with the mortgage documents

Review the original mortgage offer, product information, mortgage conditions and any later variation notices. Look for terms such as “portability”, “transfer of security”, “moving home” or “substitution of property”. The wording may confirm that the product can move, but it may also limit portability to particular circumstances or require the lender’s consent.

Your annual mortgage statement or online account may identify the product and fixed-rate expiry date, but it may not contain the full portability rules. If the documents are unclear, request the current terms that apply to your mortgage rather than relying on an old illustration or a general statement on the lender’s website.

Check whether the whole mortgage can be transferred

Portability may apply to the existing mortgage balance only. If the new property costs more, any additional borrowing could be placed on a separate product with a different interest rate, fixed period and set of fees. This can result in a “split” mortgage, with one part retaining the original deal and another part using the lender’s current pricing.

If the new property is cheaper, ask whether you can transfer only the amount needed. The remaining balance may need to be repaid, and an early repayment charge could apply to that portion. A product being described as portable does not necessarily mean that every pound of the original borrowing can be moved without conditions.

Ask the lender for the practical rules

Obtain a written explanation of the process and ask specifically:

• Whether your exact fixed-rate product is eligible, rather than portability being available only on certain products.
• Whether the sale of the old property and purchase of the new one must complete together or within a defined period.
• What happens if there is a delay, the purchase falls through or the sale completes before you have found another property.
• Whether the existing interest rate and fixed-rate end date remain unchanged after the move.
• How a lower purchase price, a higher purchase price or a change in borrowing amount affects the transfer.
• Which application, administration, legal or valuation charges will be payable.
• Whether the lender requires a new mortgage offer or other updated documentation before completion.

Ask for a redemption statement for the existing property and a projected illustration for the proposed move. Comparing these documents can reveal costs that are not obvious from the word “portable”, including charges on any amount that cannot be transferred.

Consider the timing of the fixed term

Portability is most useful when the proposed move can take place within the lender’s permitted timeframe. If your fixed term is close to ending, compare the cost of porting with waiting until the deal expires. If the move is likely to take place after the fixed period, the portability provision may no longer be relevant, although the mortgage will still need to be dealt with at completion.

Also check whether the lender treats a move as a new application for administrative purposes. Even where the original product can be transferred, the lender may reassess the proposed borrowing under its current rules. A change in income, commitments, employment circumstances or the ownership structure can affect whether the planned arrangement is acceptable.

Keep evidence of the lender’s answer

Save the relevant mortgage wording, secure messages, emails and any formal illustration. Ask the lender to confirm the answer in writing using the details of your intended sale and purchase. If the response is conditional, record each condition and the date by which it must be met.

A mortgage adviser or conveyancer can help compare the portable option with redeeming the mortgage and arranging a different deal, particularly where the sale and purchase values differ or the transactions will not complete simultaneously. Do not assume the mortgage is portable solely because the product was marketed that way; confirm how the provision applies to your particular balance, property and moving timetable before committing to the transaction.