Porting a mortgage explained
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Quick answer: Porting moves your existing mortgage deal to a new property when you move home — you keep the same rate but must pass affordability checks and pay valuation fees.
Lenders offer porting to avoid early repayment charges when relocating. Not every deal is portable and you may need to borrow more at current rates for an top-up. This guide explains the process.
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Read the full mortgages & first homes guide →Primary source: www.gov.uk/buy-sell-your-home
When porting helps
If your fixed rate is below current market rates, porting preserves cheap borrowing when moving house.
Porting avoids ERCs on the existing loan amount that stays the same or reduces. You only pay ERCs on any additional borrowing above the ported balance.
When it may not work
If the new property fails lender criteria — leasehold short leases or unusual construction — porting can be refused. You may need to remortgage with a new lender instead.
Needing significantly more borrowing may split the loan across old rate and new higher rate, reducing benefit. The top-up portion is priced at current market rates.
Process
Apply early — porting takes similar time to a new application. You'll pay valuation and legal fees like any purchase.
Your solicitor coordinates redemption of the old charge and registration on the new property on the same completion day. Porting must complete simultaneously with your property purchase.
Common questions
Can I port to a cheaper house?
Yes if the loan fits the new property's value and LTV limits — you might leave equity behind as deposit on next home.
Is porting free?
No — valuation, legal and possibly arrangement fees apply even though ERCs may be avoided.
What if rates are now lower?
Remortgaging with ERCs might still win if savings exceed penalties — compare both scenarios.