Shed, garden buildings & storage how to build a shed an afternoon and this guide from homebase is all you need to build & erect a shed. from the base to assembly, we can walk you through the process. from the base to assembly, we can walk you through the process.. Wood, metal or plastic? apex roof or pent? from a petite 4' x 3' to an epic 30' x 12'? we offer our sheds in a wide variety of sizes and styles to suit almost any garden.. Buy mercia overlap wooden garden shed - 7 x 5ft at argos. thousands of products for same day delivery