The quick answer is yes, there are mortgage products on the market to fund self-build projects.
You will need to access a specialist lender and a good mortgage broker should be able to save you time and money in accessing the right deal for you. Obviously, there are extra hurdles to jump through than standard lending.
For instance, where do you intend to live while your house is being built? And how will the cost of these arrangements (i.e. mortgage or rental payments) affect the amount you’re able to borrow to construct your new property?
Build-It has a good resource and gives an example of mortgage rates visit: https://www.self-build.co.uk/self-build-mortgages/
Take professional advice when you consider any form of lending.