How Old Is Your House?

A Guide to Finding the Age of Older Homes

Upper floor detail of Abraham Lincoln's home in Springfield, Illinois
Upper floor detail of Abraham Lincoln's home in Springfield, Illinois. Photo courtesy National Park Service Digital Image Archives via Wikimedia Commons, Public Domain

The real estate lady says the house was built in 1972. The man down the street remembers when your house was being built in 1952. But one look at the kitchen, and you know they're both wrong. This place is practically prehistoric!

Pinpointing a home's birthday may be difficult. Written records of construction and renovation may be confusing and conflicting. Unless you have personally witnessed the construction, your house could be any age.

Or could it? To make sense of it all and verify your instincts, you need to be an architecture sleuth. Here's how.

1. Identify the visual character of the building.
Houses aren't usually built all in one piece. Rooms are added, additions built, roofs raised, and porches redesigned. Abraham Lincoln's Home in Springfield, Illinois is a good example—it started out as a one-story Greek Revival style.

Every building has its own identity displayed inside and out. Preservation Brief 17 from the U.S. Department of Interior shows you how to determine the distinctive character of an old building. What are you looking for? "Character-defining elements," says the Brief, "include the overall shape of the building, its materials, craftsmanship, decorative details, interior spaces and features, as well as the various aspects of its site and environment."

2. Try to identify the architectural style of your house.
Look at the shape of the roof and the placement of the windows.

Explore Web resources such as our House Styles Index, or books such as A Field Guide to American Houses by Virginia & Lee McAlester. Compare the way your house looks with these style guides. Knowing the style of your home will help you place it in a historic period and a range of years when that style house was popular.

3. Examine the physical evidence.
The building materials and construction methods used for your home contain many clues. Homeowners can do their own investigation—the owners of this concrete block bungalow identified cast concrete blocks that looked like stone. In the early 1900s, molded concrete blocks were popularized by Harmon S. Palmer's patented invention of the hand-operated molding machine.

A trained investigator can date a house by studying its wood, plaster, mortar, and paint. Laboratories can analyze the age of these elements and pick apart layers of paint. For technical instructions, follow the process outlined in Understanding Old Buildings: Architectural Investigation. Preservation Brief 35 from the U.S. Department of Interior is a primer for the pros, but also a handy guide for the curious homeowner or conscientious realtor.

4. Check the title.
If your house is very old, the title or property deed may not list all owners. However, it can provide the name of the previous owner—and this information will help you locate people who can answer some of your questions.

5. Ask around.
Talk to survivors of the previous owners, neighbors, senior citizens at lunch, local carpenters and plumbers, and anyone else who might know something about the house.

Their memories might be faint, but someone may have an old photograph, a bill, or written correspondence that will help place your house in time.

6. Visit the Tax Assessor.
The tax roll for your home is located at your local City Hall, Town Hall, County Courthouse, or municipal building. This document will list each person who owned your property, and the value of the property. Over the years, the value usually climbs at a steady pace. An abrupt increase often means that new construction occurred. The year your property became more valuable may be, in fact, the year your house was built on a previously empty lot.

7. Visit your County Register of Deeds.
While you're downtown, stop into the Registrar's office and ask to see the tract index or a grantor-grantee index for your house. Translated from legalize, this means that you are asking to see a listing of transactions involving your property.

In addition to providing dates, these records will give you names of everyone who ever purchased the land your house is on—or whoever filed a lawsuit against it!

8. Follow the Paper Trail.
By this time, you probably already have a pretty good idea about the age of your house. Research is addictive, however. You may not be able to resist scouting out nuggets of information buried in resources like these:

  • Biographies of people who lived in your area
  • Guidebooks of your town
  • Local newspapers
  • Census records
  • City directories and phone books
  • Academic papers
  • Family bibles and genealogies
  • Insurance records
  • Wills and probate records
  • City plans and feasibility studies

Be an advocate for archiving or digitizing paper records. In our age of information databases, physical space is at a premium. But all of the old paper records have not been transfered to computer-readable formats—and may never be.

Still Stumped?
You can always try an old trick real estate agents often use: Check your toilet. Lift the lid of the tank and look for a date. If your house is fairly new, the toilet date will correspond closely with the construction date. And if your house is old... Well, at least you know the age of your toilet. Throw a birthday party!