As well as looking at a remortgage, another way to potentially raise further capital against your property with a secured loan is a "further advance" with your existing lender.
Because secured loans are less risky for providers and can be taken over a longer period, on a monthly basis they are usually cheaper than an unsecured loan. However, you may in fact pay more interest over the total term of the loan.
Further Advances are mostly suitable for borrowing large amounts of money over the longer term - for example, for home improvements.