- Locate the archives of the municipality or county where your house is located. The tax office usually has an archive section. If not, employees of the tax office might be able to help you locate the person in charge of the archives. The archives will have information about the original deed, owner, building permits and possibly a set of blueprints. If the floor plan is not there, proceed to the next step.
- Locate the fire insurance maps for the community. You can also find these at your local city or town hall. Many of these maps date back to the late 1800s. The maps can indicate the construction material used and include a three-dimensional drawing of the neighborhood in which your home is located. With these, you could determine the frame of the structure and where old windows or doorways were. If you need more help, proceed to the next step.
- Find your local building inspector's office. If it is not in the city or town hall, the clerks should be able to tell you where to find the building inspector. Builders usually apply for a permit before building houses. Permits, along with floor plans and elevation levels, are located at the building inspector's office. While these permits might not be as old as your house, they can give you details about the floor plan up to the last 20 years. If you still need more detail, continue down the list.
- Browse through historical plan books. These are useful if the house was built in the early 20th century. Many homes built during that time period started from floor plans or kits bought from stock plan books or Sears, Roebuck mail-order kits. The next step provides more information about this.
- During the latter part of the 20th century, many floor plans and home designs were advertisements in newspapers and home magazines. You can find many of these home plans through library archives or the Internet. This type of advertising was common from the '70s through the mid '90s.
- Speak with neighbors. Often, if you look around your neighborhood, you will notice that your house is similar to others in the area. Someone with a similar house design might have a floor plan or information on where to get one. Levittown, New York and sections of Amityville, New York are good examples of this. If this does not work, you still have one more step to try.
- Hire an expert in the housing industry. The person will most often be an architect or structural engineer who can use a set of field measurements and other clues to recreate a floor plan for your house.