Section 1 places an obligation on builders and developers to build dwellings ‘fit for human habitation. The duty is owed to all persons who acquire an interest in the dwelling for six years from when the work is completed or remedied. Section 3 removes ‘caveat emptor’ in selling property (this requirement is not restricted to dwellings) and makes vendors and lessors liable for negligent work on the property carried out before the sale. Section 4 makes ‘repairing’ landlords liable for defects of which they know or ought to have known. All public liability and household policies carry a Defective Premises Act 1972 liability extension.