I think you should be able to read what it says on the roof.
Beach House Restaurant is clearly signed on the roof. But it is not Beach House it is the tea room owned by the Beach House that was commissioned by Rose Humberstone. In the second picture that I have just added you can see the Beach House on the left and the tearoom/restaurant on the right. Whether the top photo shows an improved building sometime later we are not sure but it definitely looks a bit different.