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There's a lengthy discussion on this a while back. There were quite a few considerations so you may want to look back and try and find it.
Off the top of my head:
Does your fiancee already own a property, if so then there'll be hefty stamp duty to pay.
What's the value of the outstanding mortgage. Again, this will be assessed for stamp duty.I don't think being married makes a difference but I'm not 100%.
A bit of reading here https://www.gov.uk/guidance/sdlt-transferring-ownership-of-land-or-property#if-you-marry-enter-into-a-civil-partnership-or-set-up-home-together if the property has a reasonably high outstanding mortgage then it's worth looking into it properly with someone who understands the tax implications.
I have two years left on a 5 year fixed mortgage and am considering remortgaging to add my fiancée to the mortgage. This would also give us financial stability over the next few years and I may change my job in that time, or we might start a family. Worth doing this before we get married, or after? I suspect I should get "proper" advice albeit not sure whom to approach. IFA? Mortgage broker? Google?