Kam Mc

I'm a VAT registered property developer usually buying land and building new residential properties for sale. For the first time I have purchased a residential property to rennovate and sell which I know is exempt and therefore blocked from claiming input tax. However I am also in the process of purchasing land to build a new residential property for sale. My question being, can partial exemption apply in one VAT period and not in another? In my current VAT period I only have expenses in relation the the rennovation but in the next quarter I will have expenses for the new build too.