Mortgage due up what should i do

Hi All

Thanks for taking the time to look at my post I was hoping that someone could help me or even point me in the right direction of what to do next.

Myself and my wife have a great home that we pay an interest only mortgage on.

We got married this year and so we have taken a loan out to help us out with that.

The mortgage is due up this January and I was hoping for some advice.

We are considering selling the house and mover to a newer more finished house (in terms of building work and changes) but we were curious if there are any sites that we can use to asses are likely mortgage levels with our 'debts' removed to give us a fair idea of what price range to look at.

Or we were looking to remortgage early would you be able to tell us if that's an option or not

If this posted elsewhere apologies but thanks in advance for your advice and help
budgetbreaker