If you are unable to save enough money to pay for home improvements, then you can always apply for home improvement grants. Home improvement grants are not that hard to get. All you need is to meet the criteria of grants and apply for it. Different companies provide grants for specified home improvements. Whether you want to install solar panels, increase rooms or replace water heaters, they have grants for all of it.
Even if you cannot apply for home improvement grants, you can always consider remortgage. It is a little difficult, but it's worth a shot.
When it comes to renovation and improvements of your house, there is no other best way to pay for it than your own savings. Also there is a sensation of satisfaction in it. Now the question here is, will my savings be enough? Why not? Save a portion of your income every month and also put your bonuses in your bank account. Try not to spend them on vacation. Spend smartly to save more and when it's time, you will have more than enough needed for your house improvements.