If you're searching for a historic structures report, the preservation planning document you're usually looking for is a Historic Structure Report, or HSR. The National Park Service uses the HSR to bring a structure's history, physical condition, significance, and recommended treatment into one working document, ideally before major preservation decisions are made.
A strong HSR does more than describe an old building. It explains how the structure developed, identifies what survives, evaluates its condition and significance, and creates a defensible basis for deciding what should happen next.
What is a Historic Structure Report?
National Park Service Preservation Brief 43 describes a Historic Structure Report as a document that combines documentary, graphic, and physical information about a property's history and existing condition. It also addresses owner or management goals, evaluates treatment choices, and outlines recommended work. Although HSRs are most often discussed in relation to buildings, NPS guidance also recognizes their use for other historic resource types, including certain structures, objects, and groups of related buildings.
That makes the HSR both a research document and a planning tool. It can guide later design and construction, support maintenance decisions, preserve information discovered during investigation, and give future teams a record of why treatment decisions were made.
The format isn't identical in every organization. NPS guidance provides a widely used model, but state agencies, universities, nonprofits, local governments, and private owners can establish their own scope and deliverable requirements.
What does a Historic Structure Report include?
The NPS model generally organizes an HSR into an introductory section, Part 1: Developmental History, Part 2: Treatment and Work Recommendations, and, when appropriate, a later Supplemental Record of Work Performed. The exact level of detail depends on the resource, available documentation, anticipated work, and the client's objectives.
- Administrative and project information, including the purpose of the study, ownership or management context, related reports, and known limitations.
- Developmental history, including documentary research, chronology of construction and alterations, historic photographs or drawings, and changes in use.
- Physical description and existing conditions, based on field investigation and, when appropriate, measured drawings, material testing, structural investigation, or other technical analysis.
- Evaluation of significance and character-defining features. If significance has already been established through a strong National Register nomination or another accepted study, the HSR may build on that work rather than recreate it from scratch.
- Treatment and use recommendations, including selection and rationale for an overall treatment approach, such as preservation, rehabilitation, restoration, or reconstruction, followed by specific work recommendations, maintenance needs, and areas requiring further investigation.
- Supplemental record of work performed, when the report is updated after work, documenting what was actually done, conditions discovered during construction, materials used, and changes from the original recommendations. Preservation Brief 43 describes this later documentation as a Supplemental Record of Work Performed, which may include a Completion Report and supporting technical data.
NPS guidance emphasizes that the report should remain useful after publication. New physical evidence, later research, and completed work can be added so the HSR functions as an active record rather than a one-time snapshot.
When is an HSR useful?
HSRs are especially useful when a significant structure is approaching major work and the existing record isn't enough to support confident treatment decisions. NPS guidance identifies situations such as inadequate knowledge of a structure's developmental history or condition, competing treatment options that could affect historic fabric, or the need to document completed treatment.
The report is often most valuable before design is far advanced. Research and physical investigation can reveal earlier construction, hidden materials, significant alterations, recurring deterioration, or character-defining features that would otherwise be easy to overlook.
For firms pursuing preservation work, that timing is also commercially meaningful. An HSR procurement can appear before later architectural, engineering, specialty restoration, or construction work. That makes it one of the planning-stage records worth watching when you're trying to find historic preservation projects before formal procurement.
Who prepares a Historic Structure Report?
HSRs are commonly multidisciplinary. The National Park Service notes that a project team can include historians, historical or preservation architects, structural and building-systems engineers, archeologists, landscape architects, conservators, materials specialists, code consultants, photographers, and other experts as the property requires.
The team should match the questions the report needs to answer. A masonry building with structural cracking may need different expertise than a timber structure with finish analysis, a museum property with collections concerns, or a site where archeology could affect treatment decisions.
How an HSR differs from other preservation documents
Several preservation documents can contain overlapping information, but they aren't interchangeable.
- Condition assessment: focuses primarily on the physical condition of a structure or system, including deterioration and causes. A condition assessment can be part of an HSR or a narrower stand-alone study.
- National Register nomination or eligibility evaluation: focuses on historic significance, integrity, boundaries, and the applicable National Register criteria. An HSR may use that work, but its purpose is broader treatment and stewardship planning.
- HABS, HAER, or HALS documentation: creates archival records such as measured drawings, large-format photographs, and written histories for the permanent national collection. That documentation can support an HSR, but it isn't the same as a treatment-planning report.
- Design and construction documents: translate approved treatment decisions into drawings, specifications, and contract requirements. An HSR can provide the basis for that work, but it isn't a substitute for final design documents.
An HSR doesn't automatically mean a project is approved or funded
A Historic Structure Report is evidence that an owner or agency is investing in understanding a property, not proof that rehabilitation or construction will follow on a particular schedule. Some reports lead directly into design. Others support long-term stewardship, phased work, fundraising, grant applications, emergency stabilization, or future capital planning.
An HSR isn't automatically required merely because a project involves Section 106 or the federal historic tax credit. Those programs have their own legal and documentation requirements. Separate agency or owner policies can require an HSR, however; within NPS management, for example, agency guidance calls for an approved HSR before restoration, reconstruction, or extensive rehabilitation of historic structures. A particular owner, grant, agreement, or solicitation may also require one. For related context, see Preserve Signal's guides to Section 106 and the federal historic tax credit.
Why an HSR can be an important project signal
For project intelligence, the value of an HSR is its position in the sequence. A public owner that commissions historical research, measured documentation, condition investigation, and treatment recommendations is doing more than casually discussing an old building. The scope can reveal what problems are known, what expertise is needed, how the owner is thinking about future use, and which building systems or materials may become part of later work.
The strongest signal comes from connecting the report to other evidence. A preservation grant may fund the study. A later capital appropriation can add money. An architect selection can move the recommendations into design. Procurement and permits can show that implementation is getting closer. Preserve Signal's guide to tracking a preservation project from funding through construction explains why no single record should be read in isolation.
The same logic applies to reuse projects. A feasibility study or HSR can help define whether a historic building can support a proposed new use before a full redevelopment plan is settled. That's one reason these studies sometimes appear among the early records surrounding historic adaptive reuse projects.
The practical takeaway
A Historic Structure Report is one of the most useful planning documents in preservation because it connects history, physical evidence, significance, condition, and treatment in a single framework. Its real value isn't the report itself. It's the disciplined decision-making the report can support before, during, and after major preservation work.
For owners, an HSR can reduce the risk of making major treatment decisions without understanding the building. For architects, engineers, contractors, consultants, and specialty firms, the appearance of an HSR can also be an early sign that a preservation project is becoming more defined.