Researching the history of your house is a step-by-step process, and the key to doing it well is understanding that local records connect to one another. The parcel number you pull from your county assessor's office becomes the search term for building permits. The names you find in old deeds become the search terms for census records and city directories. This guide walks through that chain, using examples from local government and library resources, so you can adapt the process to your own county or municipality in the United States.
Starting Your Search: The County Assessor's Office
Every property history search begins with identifying your property precisely. Your county assessor's office (sometimes called the tax assessment office, though the exact name varies by jurisdiction) maintains records for every parcel of real property in the county. These records provide ownership history, descriptive property information, and assessed values, which together indicate how the property has changed over time.
The Los Angeles Public Library's house history guide describes this first step directly: get your property description and Assessor's Identification Number (AIN) from the county assessor's portal. That number is the foundation for everything that follows. The assessor's data itself is compiled from recorded deeds, plats, and other public records, as Surry County, North Carolina's real estate search site explains, so it may not be updated immediately after a property transfer. For that reason, the assessor is a starting point, not the final word on ownership.
Some jurisdictions add further detail at this stage. In Los Angeles, addresses within the city can be searched through ZIMAS, the city's zoning and property information system, which supplies zoning data alongside the basic assessor information. Multnomah County, Oregon, offers digitized land use planning decisions from 1998 to the present through a searchable database, plus property zoning information for unincorporated areas through its Department of Land Use and Transportation.
Tracing Ownership: Deeds and Title Records
Once you have your legal description and parcel number, you can trace the chain of ownership through deeds. A deed or title search reveals who owned the property and when, establishing the sequence of owners going back in time. Deeds are typically held by the county recorder's office or county clerk's office, and access may be available online or require an in-person visit, depending on your county.
The National Trust for Historic Preservation describes this pairing of records plainly: a deed or title search tells you who owned the property and when, while tax records tell you how the property has changed over time. Because the assessor's records are themselves compiled from recorded deeds, you can use the assessor's current ownership information to locate the most recent deed, then work backward deed by deed, using each owner's name and the recording dates to find the prior transaction.
Local historical societies and preservation organizations can also tell you whether your property sits within a historic district, and the National Register of Historic Places can be searched for listed properties in your area. Note that this guide covers research only, not the process of nominating a property to a historic register.
Uncovering Physical Changes: Building Permits and Maps
Ownership is only half the story. To learn when your house was built and how it has been altered, turn to building permits. The Los Angeles Public Library's guide notes that the original construction date, and possibly the names of the contractor, architect, and original owner, appear on the building permit, which can be obtained online or in person from the city's Department of Building and Safety. Your parcel number or address is what you use to search for those permits.
Permit availability and detail vary significantly by municipality and the age of the property, and some older records may be archived at local libraries or historical societies rather than at the building department itself. To see how the physical structure changed between permit dates, many city and county records offices also hold Sanborn fire insurance maps, which can date back as far as the 19th or 20th centuries and show the footprint of your house and the layout of the surrounding neighborhood. Multnomah County Library, for example, provides digital Sanborn maps alongside its Historic Resource Inventory of Portland from 1984. These maps primarily cover urban and commercial areas, and coverage varies by date.
Learning About Past Residents: Directories and Census Data
The names you gather from deeds and permits unlock the human history of your home. City and telephone directories let you look up individuals, families, and businesses by address, showing occupations, household residents, and a broader community perspective, as the Library of Congress's reference service describes. Directories may not exist for all areas or time periods, but where they do, they let you match a name from a deed to a specific address in a specific year.
Census records extend that picture with household members, ages, and occupations. Federal census records are released to the public after 72 years, so recent decades remain closed, but older schedules can show who lived in your house and how the household changed from decade to decade. The Community Tool Box at the University of Kansas catalogs the range of locally available data that can supplement this work, including lists of legal owners of all property in a town, details on specific property features, last previous sale dates, and current assessed values.
One caution from the Library of Congress: tracing a family line beyond the property itself is a different task. Because of the time and effort involved, that kind of genealogical search usually requires a professional genealogist. For house history purposes, you only need to follow the names attached to your address.
Property History Research Checklist
The table below maps each record type to the information it provides, where it is typically held, and how it connects to the next step in your research. Availability varies by county and municipality, and some records will be online while others require a visit.
| Document/Record Type | Information Provided | Typical Location/Agency | How It Connects |
|---|---|---|---|
| Assessor/Tax Records | Ownership history, descriptive property information, assessed values | County Assessor's or Tax Assessment Office (name varies by jurisdiction) | Provides the parcel number and legal description used to search deeds and permits; compiled from deeds, so may lag behind recent transfers |
| Deeds and Title Records | Who owned the property and when; the chain of ownership | County Recorder's or County Clerk's Office; online or in person | Owner names and dates feed searches in directories and census records |
| Building Permits | Construction date, alterations, sometimes contractor, architect, and original owner | City or County Building/Planning Department; older records may be archived at libraries or historical societies | Searched by address or parcel number; detail varies by municipality and property age |
| Sanborn Fire Insurance Maps | House footprint, neighborhood layout, building and street details at points in time | City or county records offices; some libraries, such as Multnomah County's, offer digital versions | Shows physical changes between permit dates; mainly urban and commercial areas, coverage varies by date |
| City and Telephone Directories | Individuals, families, and businesses by address; occupations and household residents | Public libraries, including the Library of Congress collections | Matches deed names to addresses in specific years; may not exist for all areas or periods |
| Census Records | Household members, ages, occupations, and demographics at an address | National Archives and online census databases | Released to the public after 72 years; extends directory findings with household detail |
Your Next Step: Start with Your Local Assessor
Begin your property history research by contacting your local County Assessor's Office or equivalent to obtain the property's legal description and parcel number. That single piece of identification is the foundation for every subsequent search: the parcel number unlocks building permits, the legal description anchors deed searches, and the owner names you find there open the directories and census schedules that reveal who lived in your home.
The measurable first milestone is simple: successful retrieval of your property's legal description and parcel number from the assessor's office. Once you have that in hand, you have the key that every other record in this guide is organized around, and you can work outward from it, deed by deed and permit by permit, until the timeline of your house takes shape.
Sources
- House and Property History Records — Multnomah County
- 10 Ways to Research Your Home's History — Savingplaces
- History of Your House — LAPL
- How do I research the history of my house? - Ask a Librarian
