This will vary depending on the style and material of the building you have purchased but the following items may be required for your building;
Wooden Sheds and Summerhouses - Spirit level, hammer, adjustable spanner, handsaw, stanley knife, stepladder, sealant and gun.
Log Cabins - Electric Screwdriver, wooden or rubber mallet, spirit level, hammer, handsaw, stanley knife, stepladder, sealant and gun.
Metal Sheds - Electric Screwdriver, power drill, adjustable spanner, sealant and gun.
Would you like some assistance regarding a bespoke garden building?