A historic resource survey (sometimes referred to as a historic resources survey) is one of the basic tools of preservation planning. It identifies and records places within a defined area so owners, communities, agencies, and planners have better information about what exists, what may be significant, and what may need closer evaluation.
A survey can cover a downtown block, a neighborhood, an entire county, a transportation corridor, a campus, or a project area. It may be a broad first look or a detailed property-by-property study. What it doesn't do automatically is designate every property it records as historic, make every resource eligible for the National Register of Historic Places, or create preservation restrictions. When survey work identifies a concentration of related resources, the next question may be whether the area qualifies as a historic district.
For the underlying terminology, see Preserve Signal's guide to what a historic resource means in preservation practice.
What is a historic resource survey?
In preservation practice, a historic resource survey is a systematic process for identifying, documenting, and organizing information about historic or potentially historic properties in a defined study area. The work usually combines background research with field investigation, mapping, photography, and standardized records.
The Secretary of the Interior's Identification Standards emphasize that survey effort should be designed around a defined purpose. The scope depends on what's already known, the decisions that need to be made, and the preservation or management goals behind the work. That means there's no single survey format that fits every project.
Reconnaissance survey vs. intensive survey
National Park Service guidance uses two broad levels of field survey: reconnaissance and intensive survey. These terms are useful, but individual state and local programs may define their own deliverables and terminology.
- Reconnaissance survey provides a broad characterization of an area. It can identify property types, patterns, concentrations, and places that may deserve more study. It often helps set priorities and determine where more detailed work is warranted.
- Intensive survey is more property-specific. NPS guidance describes it as the level used when planners need precise information about individual properties, including location, appearance, integrity, significance, and boundaries sufficient to support evaluation.
The two approaches aren't mutually exclusive. A community may survey most of a city at reconnaissance level and then conduct intensive work in selected neighborhoods, corridors, or resource types.
What does a historic resource survey record?
The exact fields depend on the program, but an architectural historic resource survey commonly records enough information to identify the resource and understand its physical and historical character.
- Location and mapping information, often including GIS data.
- Current photographs and an architectural or physical description.
- Resource type, approximate date of construction, style or form when applicable, materials, alterations, and setting.
- Historical research, ownership or development history, and associations relevant to the survey's purpose.
- Information about condition and integrity when required by the survey methodology. Condition and integrity aren't the same thing: condition concerns physical state, while integrity concerns whether the resource retains the qualities needed to convey significance.
- A preliminary or formal significance and National Register eligibility assessment when the survey scope calls for evaluation.
- For potential districts, information that helps distinguish contributing and noncontributing resources and define possible boundaries.
Archaeological survey uses different field methods and documentation. An agency may combine architectural and archaeological work under a broader cultural resources scope, but those aren't interchangeable disciplines.
Historic resource survey, architectural survey, and cultural resources survey
Historic resources survey is a common umbrella phrase in state and local preservation programs. Architectural survey usually focuses on the built environment, including buildings, structures, objects, districts, sites, and associated settings or landscapes, depending on the program. Cultural resources survey can be broader and may include archaeological resources, cultural landscapes, or traditional cultural properties and traditional cultural places, depending on the agency and regulatory context.
The title of a report doesn't tell you everything. Check the scope, resource types, research design, survey area, and evaluation standard before assuming what was or wasn't studied.
A survey record isn't the same thing as designation
This distinction matters. Being photographed, mapped, assigned a survey number, or entered into a state inventory doesn't, by itself, necessarily mean a property is listed in the National Register, locally designated, or subject to preservation restrictions.
State programs make that point in different ways. North Carolina's survey data distinguishes properties that are 'Surveyed Only' from properties with other statuses. Maryland states that inclusion in the Maryland Inventory of Historic Properties isn't a designation and doesn't itself create legal restrictions. Virginia describes survey as documentation of historic character and notes that survey itself doesn't affect property owners beyond that documentation.
A survey can, however, provide the factual basis for a later National Register nomination, eligibility determination, preservation master plan, local designation study, or other planning action. If a local ordinance gives inventory status a particular consequence, that consequence comes from the ordinance or other applicable law, not from the survey label alone.
When an evaluation is included, the relevant framework is the National Register criteria, applied within an appropriate historic context and with integrity considered.
How historic resource surveys fit into Section 106
Historic resource surveys are common in federal project review, but a survey isn't the same thing as Section 106. Under Section 106, the federal agency must make a reasonable and good-faith effort to identify historic properties within the area of potential effects. That effort can include background research, consultation, oral history interviews, sample field investigation, and field survey.
The federal agency determines the appropriate amount and type of identification effort based on the undertaking, existing information, likely historic properties, potential effects, and consultation with the SHPO or THPO and other appropriate consulting parties. Not every undertaking requires the same survey effort.
A survey consultant may recommend that a property is eligible or not eligible for the National Register, but in Section 106 review the federal agency is responsible for applying the National Register criteria in consultation with the SHPO/THPO and other required consulting parties. If the federal agency and SHPO/THPO disagree, the matter can require a formal determination of eligibility from the Keeper of the National Register. For a fuller explanation, see what Section 106 can signal about upcoming historic preservation work.
Why survey information may need updating
Historic resource survey data doesn't remain current indefinitely. Buildings are altered or demolished, boundaries change, new research becomes available, and properties that weren't old enough or well understood during an earlier survey may warrant evaluation later.
NPS guidance treats identification as an ongoing process and cautions against evaluation based on documentation that may be out of date. Virginia's survey guidance likewise notes that older records may no longer accurately reflect a resource's current condition, location, or even continued existence.
For anyone using survey data, the survey date is therefore important. An older inventory can be valuable background, but it shouldn't automatically be treated as current field verification.
Why a historic resource survey can be a project signal
For preservation firms, a new survey can be worth watching because it often appears when an owner or public agency is trying to understand a place before making a larger decision. The survey may relate to comprehensive planning, a transportation project, redevelopment, a potential historic district, a grant-funded planning effort, or compliance review.
That doesn't mean a rehabilitation contract is coming. A countywide inventory can remain a planning resource for years. A Section 106 survey may document resources along a project corridor without creating any preservation construction work.
The signal becomes stronger when the survey is followed by other evidence, such as a preservation grant, capital improvement plan, a local designation process, a building assessment, design procurement, or a funded rehabilitation phase.
For firms following early-stage work, the practical move is to connect the survey to the owner, the reason it was commissioned, and the next likely decision. That's the same discipline described in Preserve Signal's guide to finding historic preservation projects before formal procurement.
The practical takeaway
A historic resource survey is a structured way to identify and document places that may matter to preservation, planning, or project review. Its value comes from the information it assembles, not from treating every survey entry as a formal historic designation.
When you read a survey, check the survey level, date, geographic scope, resource types, evaluation standard, and actual status assigned to each property. Then look at what happens next. The survey may be the end product, or it may be the first visible step toward a nomination, planning decision, federal review, local preservation action, or future project.