I want to build a new garage this year but have not decided what type of construction to use. If I go for normal concrete blocks I will have to get a bricky to lay them as I could not do it accurately enough. One option I am looking at is a kit garage with metal frame and box profile sheeting for the walls and roof. This would be easy to put up but might not be acceptable to the local council. I have recently been told about some hollow interlocking concrete blocks which you lay dry and then fill the cavity with concrete. Has anyone tried these and what are they called