Mortgage query buying new house

[Toon49]

We are 2 years into a 5 year fixed term mortgage over 11 years with Santander. We are planning on moving house to a more expensive house. My mortgage is portable. (We expect current house £120,000 moving to £230,000 have paid off £95,000).
How does it work borrowing more on a mortgage?
We would want to extend it to 25 years (previously on 11 years to pay off more to save a deposit) is this possible whilst on a fixed rate mortgage?
Thanks for any help!

You'd need to speak to your mortgage provider about the specifics of your contract with them, but when we did the same we had the option of borrowing more and extending the mortgage length with our provider, or there were early repayment charges if we wanted to go with a different provider and pay off the old mortgage.

It's a completely separate mortgage, it just has to be with the same provider as you can't have 2 banks having a claim on it if you default. Our second mortgage had a different rate, different end date, different fix periods I think - completely different product.

We'd have loved to be able to borrow more money on our existing mortgage, which had a great rate, but that wasn't an option. I don't think you will have any problems.

Just ring the bank and ask, or make an appointment to talk to someone in a branch - it's in their interest as well as yours to help you get the best fit mortgage. Write a list of questions in advance so you don't forget any, and take notes. Repeat back to the advisor at the end what you've understood and ask if you've got it right. (This does not make you look clueless, by the way, it makes you look like you are on the ball and taking it seriously, which is what the bank wants to see.).

You don't have to commit to one thing and only ask about that - in fact you shouldn't commit until you have a lot more info. Just say you want to consider your options, and ask about what impact different durations, different fixed terms, etc, will have on repayments, and what you qualify for. With that sort of loan to value ratio and a track record of paying promptly, you should have a fair bit of choice.

We had two mortgage products on our last house - one ported to it and one additional. Different rates, different durations, same lender.

Yes, as above, you end up with two mortgages. You can, however, then remortgage to one when both the previous products come to the end.

Okay that's great makes alot of sense. Planning on ringing the bank at the weekend, tried previously and took too long to get through so needing to wait until I have more time!
Do you think we would be able to change the term of our current 5 year fixed rate mortgage from 12 year to 25?