We would like to have a straight run of wall cupboards above the work surface that has an induction hob. What is the minimum height we can have the cupboard( and extractor) above the hob? Thanks

Yeah, S.Bray is right.... Follow the hob manufacturers guidelines. These are usually 750mm above a gas hob and 650mm above electric hob to any combustible materials but you need to confirm this. A call to the manufacturers service/technical department will get the correct answer. They are always happy to help.

Generally wall units are fitted approximatly 500mm above work surface but these can be installed to suit your hieght. With regards to the extractor you will find they are normally around 700mm to the lowest point on the underside of the hood to the highest point of the hob but the installation manual will give all dimensioins as this is manufacturers spec and will superseed everything else.