To finance a loft conversion, you typically have several options:

1. Remortgaging your existing home to access additional equity.
2. Taking out a personal loan (an unsecured loan).
3. Utilizing a dedicated home improvement loan.
4. Using savings if you have enough readily available.
5. Using credit card to make some payment likes material.

The best option for you will depend on your financial situation, credit score, and the amount you need to borrow.