“to see that the work which he takes on is done in a workmanlike or, as the case may be, professional manner, with proper materials and so that as regards that work the dwelling will be fit for habitation when completed.”
“... a fundamental defect, namely, the inadequacy of the foundations.”
“In all the circumstances, applying the test of whether the house was unfit for habitation in the sense of being unsuitable for its purpose, I have no hesitation in finding that the house, as built, was unfit for habitation under Section 1 of the DPA in that it was built with unstable foundations which resulted in movement and cracking and other defects caused by heave.”