Abstract: An apparatus and method for the attachment of siding to an architectural structure. The apparatus of the invention is characterized by a longitudinally extending gage member, a first element for engaging a first piece of siding, a second element for engaging a second piece of siding, and a handle element. In operation, the element for engaging the first piece of siding is adjusted using the gage member as a guide. Once adjusted as desired, the apparatus is placed in abutting contact with a first course of siding previously attached to an architectural structure. Next, a board making up a second course of siding is positioned in the element for engaging the second piece of siding. In the final step of the procedure, the board positioned in the element for engaging the second piece of siding is attached to the architectural structure.