Contractors use blueprints to guide the building procedure. Blueprints show that the floor plan, the location of electrical and plumbing fittings, and the materials for use. By law, contractors are required to include a copy of the blueprints when they submit an application for a building permit with the civil construction department, which preserves a minumum of one copy for the own records. Blueprints registered with the building department are public record and accessible to anyone wanting to see them. There is, however, usually a small fee for copies.
Go to the building department of the local authorities that serves the area in which the house is located.
Give a clerk your address and request a copy of the building plans.
Pay any required copy fees and take your own plans.