If the cost of your home improvements isn’t too high, you could consider paying with a credit card. This might be an attractive option if you can get a card with a low interest rate, or one that has a 0% introductory rate.
Paying via credit card also gives you some protection should there be issues with the contractor that carries out your home improvements, as you’ll be protected by Section 75 of the Consumer Credit Act.
Before taking on any credit card debt, as with any other form of borrowing, you need to be totally clear what the required repayments will be. You’ll also need to be confident that you can afford to make the minimum repayments (at least) on time, each month. There is also often an initial charge for borrowing this way, e.g. 3% of the amount borrowed.