If the will (either explicitly or implicitly) names a 'residuary beneficiary' (i.e. someone who is to receive everything not specifically mentioned in the will) then, clearly, that person inherits the house.
If, as seems more likely from your post, there is no residuary beneficiary, then a 'partial intestacy' is created and the house (together with anything else left unallocated by the will) will be inherited in accordance with the intestacy rules:
https://www.gov.uk/inherits-someone-dies-without-will
which, from the information in your post, would seem to be equally by the two daughters.