Remortgage to release equity

lightbeans

We bought a house in a very poor state in January this year, and by the end of this year it will have been 90% renovated and hopefully substantially increased in value.

I want to release some equity in order to pay off some debts and final renovations. Is this as simple as finding a new mortgage deal, paying for a new valuation and (assuming it's higher) borrowing slightly more?

Is there any chance I could get my existing provider to do this - I am with the sharetobuy deal which was by far the best rate last time I looked around, or are they less likely to do this for existing customers?