Porting a Mortgage

Moving Home Mid Deal? Expert Mortgage Advice

If you are part way through a fixed rate and want to move, porting a mortgage could let you take your existing mortgage deal with you and avoid paying early repayment charges. It is not automatic, though. Your lender has to approve the new property and reassess you, and porting is not always the cheapest option. We compare porting your mortgage against a brand new mortgage so you can make an informed decision.

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What Does Porting a Mortgage Mean?

Porting a mortgage means transferring your current mortgage deal, at the same interest rate and on the same terms, from your existing property to a new property. You stay with the same lender, keep your existing rate for the rest of the deal and avoid the early repayment charge you would pay if you cleared the mortgage early.

Most fixed rate and tracker mortgages are portable, but the lender's criteria still apply. In practice porting works like a new mortgage application for the same product, so your income, outgoings and credit profile are all checked again.

How Does Mortgage Porting Work?

When you sell your current property and buy a new one, your lender moves your existing mortgage balance across to the new house. If you are buying a more expensive property and need more money, the lender lends the additional borrowing on a separate product at its current mortgage rates. You then have two parts to your mortgage, often with different rates and end dates.

If you are moving to a cheaper property and borrowing less, you can usually port part of the mortgage. The lender may charge early repayment charges on the part you pay off.

Timing matters too. Most lenders want the sale and purchase to happen at the same time, or within a set window after you redeem the old mortgage. If there is a gap, you may pay the early repayment charge and get it refunded once the porting completes.

How Much Deposit Do You Need to Port?

Your deposit usually comes from the equity in your current property. If house prices have risen, your loan to value may have improved, which can help you secure a better rate on any additional borrowing.

What you need depends on the price of the new home and how much more you want to borrow. As a general guide:

Family carrying boxes into their new house after porting their mortgage
  • Same loan amount: port the existing mortgage balance and use your equity as the deposit
  • Borrowing more: port the existing deal and take extra borrowing on a new product
  • Borrowing less: port part of the mortgage and check for early repayment charges

We will work out your equity, the loan amount and the loan to value on the new purchase, and show you what each option would cost over the next few years.

Should You Port or Take a New Mortgage?

Porting makes sense when your current rate is cheaper than today's rates or when the early repayment charges are high. A brand new mortgage can be better when rates have fallen, when you are near the end date of your current deal or when you need a lot of additional borrowing.

We add up the early repayment charges, the arrangement fees, legal fees and valuation fees, and compare them with the saving on interest, so you can see which route really costs less.

Can You Borrow More When You Port?

Yes, as long as you pass the lender's affordability check for the higher loan. The extra money is a new mortgage product, so it will have its own rate and may have its own arrangement fee.

Some lenders let you line the end date of the extra borrowing up with your existing deal, which makes it easier to remortgage everything together later.

What if Your Lender Says No?

Porting is not guaranteed. A lender can decline if your income has dropped, your credit history has changed, the new property does not meet its lending criteria or you are close to its upper age limit.

If that happens you may still be able to switch to a different lender, paying the early repayment charge, and we can tell you quickly whether that still works out.

Eligibility: What Do Lenders Look At?

When you port a mortgage, the lender checks you and the new property against its current criteria.

Income and Affordability: a full affordability check, even if you are not borrowing more.

Credit Profile: any changes since you took the original mortgage. If you have adverse credit, you could be referred to our sister company, Alexander Southwell Mortgages, as this may fall under the specialist category.

The New Property: a valuation to confirm the property type and value meet its lending standards.

Your Circumstances: a new job, a change in household or a longer mortgage term can all affect the decision.

Porting makes sense when your current rate is cheaper than today's rates or when the early repayment charges are high. A brand new mortgage can be better when rates have fallen, when you are near the end date of your current deal or when you need a lot of additional borrowing.

We add up the early repayment charges, the arrangement fees, legal fees and valuation fees, and compare them with the saving on interest, so you can see which route really costs less.

Yes, as long as you pass the lender's affordability check for the higher loan. The extra money is a new mortgage product, so it will have its own rate and may have its own arrangement fee.

Some lenders let you line the end date of the extra borrowing up with your existing deal, which makes it easier to remortgage everything together later.

Porting is not guaranteed. A lender can decline if your income has dropped, your credit history has changed, the new property does not meet its lending criteria or you are close to its upper age limit.

If that happens you may still be able to switch to a different lender, paying the early repayment charge, and we can tell you quickly whether that still works out.

When you port a mortgage, the lender checks you and the new property against its current criteria.

Income and Affordability: a full affordability check, even if you are not borrowing more.

Credit Profile: any changes since you took the original mortgage. If you have adverse credit, you could be referred to our sister company, Alexander Southwell Mortgages, as this may fall under the specialist category.

The New Property: a valuation to confirm the property type and value meet its lending standards.

Your Circumstances: a new job, a change in household or a longer mortgage term can all affect the decision.

The Mortgage Porting Process: Step by Step

01

Review Your Current Deal

We check whether your mortgage is portable, the early repayment charges and the end date of your current deal.

02

Compare Your Options

We compare porting with a new mortgage deal from another lender so you can see the real cost of each.

03

Speak to Your Lender

We contact your existing lender, confirm its porting rules and arrange an agreement in principle for the new purchase.

04

Mortgage Application

We submit the porting application, including any additional borrowing, with up to date income and bank statements.

05

Valuation and Underwriting

The lender values the new property and completes its affordability check.

06

Mortgage Offer

You receive a mortgage offer covering the ported balance and any extra borrowing.

07

Sale and Purchase Complete

Your sale and purchase complete together and your mortgage moves with you to your new house.

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What Are the Costs of Porting a Mortgage?

‍Valuation Fees: the lender values the new property, and some lenders charge for this.

Legal Fees: you will need a solicitor for the sale and purchase anyway.

Arrangement Fees: there may be a product fee on any additional borrowing.

Early Repayment Charges: these apply if you pay off part of the mortgage or the timing does not line up.

Our Advice: fee free. We are paid by the lender when your mortgage completes.

Can I Port a Mortgage With Bad Credit?

It depends what has changed. If your credit history has worsened since you took out the mortgage, your lender may refuse the porting or the additional borrowing.

If you have adverse credit, you could be referred to our sister company, Alexander Southwell Mortgages, as this may fall under the specialist category.

Why Choose Fee Free Mortgage Broker to Port Your Mortgage?

‍No broker fees. Our advice is free to you because the lender pays us when your mortgage completes.

We look at the whole picture. We compare porting with every other option, not just the deal your current lender offers.

Experience you can trust. Our team has over 20 years of combined experience helping people move home.

We keep the chain moving. We chase the lender so your mortgage offer is ready when your sale and purchase are.

Porting questions

Porting a Mortgage FAQs

Quick answers to the questions home movers ask us most about porting.

How long does porting a mortgage take?

Usually about the same as a new mortgage application, often four to six weeks from application to mortgage offer, depending on the lender and the valuation.

Can I port my mortgage to a different property type?

Often yes, as long as the new property meets the lender's criteria. You cannot usually port a residential mortgage to a buy to let property.

Do I have to port my mortgage?

No. You can repay your current mortgage, pay any early repayment charges and take a new mortgage with a different lender if that works out cheaper.

Can I extend my mortgage term when I port?

Sometimes. The lender will check the new mortgage term against its upper age limit and your affordability.

What if my rate is on the standard variable rate?

If you are on the standard variable rate there are usually no early repayment charges, so a new mortgage deal is normally the better option.

Related guides: home mover mortgages · remortgage advice · stamp duty calculator

Your home may be repossessed if you do not keep up repayments on your mortgage. Fee Free Mortgage Broker is a trading style of Alexander Southwell Mortgage Services Ltd, authorised and regulated by the Financial Conduct Authority, firm reference 1011890.

Written by Jamie Alexander CeMAP, mortgage adviser with 15 years' experience. Last reviewed October 2026.

Speak to a Mortgage Expert About Porting Today

Moving home before your deal ends? Our mortgage advisers will tell you whether to port your mortgage or start fresh, with no broker fees to pay.

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