The Building Contract / Sale Agreement shall not contain terms which have the effect of taking away the consumer's common law or statutory rights, save for such terms as are generally and ordinarily applied in respect of building contracts or contracts for the sale of land. Any term in the building contract /sale agreement which have the effect of taking away the housing consumer's common law or statutory rights, and which is not ordinarily and generally applied in building contracts or sale agreements, shall be of no force and effect.