What Makes a Home Historic? Criteria, Integrity, and Rules

A home is considered historic when it meets a two-part test: it is significant for its connection to important events, people, or architectural traditions, and it still physically looks enough like itself to show that significance. That is the federal standard behind the National Register of Historic Places, and it is what makes a home historic in the eyes of nearly every state and local preservation program in the country. A property generally has to be at least 50 years old and has to clear both halves of the test — significance and integrity — before any official designation follows.¹

Understanding what qualifies matters for two kinds of readers: someone trying to get a home recognized, and someone who already owns a home that carries, or might soon carry, the label. The criteria are the same in both cases.

The Four Criteria for Significance

The National Register evaluates properties against four criteria. A home only needs to meet one.

Criterion A — Events. The property is tied to events that made a meaningful contribution to broad patterns of history. A house where a civil rights strategy was planned, or a neighborhood that reflects a significant migration pattern, can qualify.
Criterion B — People. The property is associated with the life of a person significant in the past. A famous former resident is not enough on its own; the person’s specific contributions have to be demonstrably linked to that home.
Criterion C — Architecture. The property embodies distinctive characteristics of a design style, construction method, or period, represents the work of a master architect or builder, or possesses high artistic value.
Criterion D — Information potential. The property has yielded, or is likely to yield, information important to history or prehistory. This usually involves archaeological investigation.

For most homes, Criterion C is the usual path. A well-preserved Craftsman bungalow from the 1920s or a mid-century modern ranch that still looks the way its architect intended can qualify on architectural merit alone.¹

The 50-Year Rule

Properties that achieved their significance within the past 50 years are ordinarily not eligible. This is a rolling window, not a fixed cutoff date. A house built in 1980 wasn’t eligible in 2025 but could be eligible now.

There is one narrow exception. A property younger than 50 can qualify if it is of “exceptional importance.”² In practice that bar is reserved for places like the home of a recently deceased president or a structure tied to a transformative recent event. Ordinary architectural distinction, no matter how striking, will not clear it until the 50-year mark passes.

The Physical Half: Integrity

Significance alone isn’t enough. The property must also possess integrity — the physical ability to still convey why it matters. The National Register breaks integrity into seven aspects:¹

Location. The property is still where it was historically situated. A house moved across town loses this aspect.
Design. The original form, plan, and style are still evident, including the arrangement of spaces, structural systems, and decorative details.
Setting. The physical environment around the property still reflects its historic character. A farmhouse now surrounded by a subdivision may lose integrity of setting.
Materials. The original building materials survive. Replacing wood clapboards with vinyl siding weakens this aspect.
Workmanship. Evidence of period craftsmanship remains visible, such as hand-carved details, ornamental plasterwork, or stone masonry patterns.
Feeling. The property still evokes the aesthetic sense of its period. This is subjective and assessed through the cumulative effect of the other aspects.
Association. The property still has a direct enough link to the event or person that made it significant.

A home doesn’t need perfect marks on all seven. What matters is whether enough integrity survives to tell the property’s story. A house that lost its original porch but kept its floor plan, interior woodwork, and roof form might still qualify. One that’s been re-sided, re-roofed, had its windows replaced, and taken on an incompatible addition probably will not. There is simply not enough of the original left to read.

Individual Listings vs. Historic Districts

A home can earn historic status on its own or by sitting inside a historic district. A historic district is a geographically defined area where a concentration of buildings, sites, or structures share a common historical, architectural, or cultural theme. Within a district, individual properties are classified as either “contributing” (they add to the district’s historic character) or “noncontributing” (they don’t, usually because they were built outside the district’s period of significance or have lost too much integrity).

This distinction matters for benefits. A contributing home inside a National Register district counts as a “certified historic structure” for federal tax purposes even if it was never listed individually.³

There is also a far more selective federal category called the National Historic Landmarks program. Only about 2,600 properties nationwide carry that designation, compared with more than 93,000 on the National Register, and it is reserved for places whose significance reaches the entire nation’s history. NHL properties face a stricter integrity standard, and all of them are automatically listed on the National Register as well. Neither designation changes who owns the property.⁴

What a Historic Designation Actually Means for the Owner

This is where most confusion lives. The word “historic” sounds like it comes with a thick rulebook, but whether it does depends entirely on which kind of designation applies.

Federal law is explicit about the National Register. Listing a private property on the Register “does not prohibit under Federal law or regulation any actions which may otherwise be taken by the property owner with respect to the property.”¹ A National Register listing by itself does not stop you from remodeling, altering, or even demolishing your own home with your own money. There is no federal permit requirement and no federal design review triggered solely by the listing.

Federal protection comes in only through Section 106 of the National Historic Preservation Act. That provision requires federal agencies to consider effects on historic properties before spending federal funds on a project or issuing a federal license or permit.⁵ If a federally funded highway project would affect your listed home, the agency has to evaluate the impact. If you’re renovating your kitchen with your own savings, Section 106 doesn’t apply.

Local designation is a different story. When a city or county places your property in a local historic district or names it a local landmark, the ordinance typically imposes real restrictions. These usually take the form of a Certificate of Appropriateness requirement before you can alter the exterior, add on, build a new structure in the district, or demolish an existing one. Routine maintenance and minor repairs generally don’t trigger review. The specifics vary widely: some commissions scrutinize window replacements and paint colors, others focus only on major alterations visible from the street.

A single home can be on the National Register with little practical constraint while also sitting in a local district with significant ones. The two designations run independently, and the local rules are the ones most owners feel day to day.

Owners Can Object to Federal Listing

Something many homeowners don’t realize: you can block your own property’s listing on the National Register. If you are the sole owner of a private property and submit a notarized objection to your State Historic Preservation Office, the property cannot be listed. For districts or properties with multiple owners, the property will not be listed if a majority of owners object, and each owner gets one vote regardless of how many properties they own in the district.⁶ If an owner successfully objects, the Keeper of the National Register can still make a formal “determination of eligibility.” That recognizes the property as meeting the criteria without actually listing it, and it matters for certain federal review processes but doesn’t bring the benefits of full listing.

Rules That Apply When You Do Renovate

When renovation happens on a historic property, the benchmark is the Secretary of the Interior’s Standards for Rehabilitation. These ten standards aren’t law on their own, but the National Park Service uses them to certify rehabilitation projects for tax credit purposes, and many local commissions adopt them as their own review guidelines.⁷

The core philosophy is straightforward: preserve what’s there, repair rather than replace, and make any new work distinguishable from the original while still compatible with it. A few principles catch homeowners off guard:

No false history. You cannot add features from another era to create a look the property never had. A Victorian porch tacked onto a Craftsman bungalow violates this standard.
Repair before replacement. Deteriorated features should be repaired. If replacement is unavoidable, the new element must match the original in design, color, texture, and where possible, materials.
Reversibility. New additions should be done so that if removed later, the historic building’s essential form and integrity remain intact.
Gentle cleaning only. Aggressive treatments like sandblasting are off the table because they damage original surfaces permanently.

The standards apply with “economic and technical feasibility” in mind, so there is some flexibility. A project that ignores the historic character of the building, though, will not get certified.⁷

Financial Benefits and Real Costs

The main federal financial benefit tied to historic status is the rehabilitation tax credit under IRC Section 47. It equals 20% of qualified rehabilitation expenditures for certified historic structures, allocated evenly across five tax years starting when the rehabilitated building is placed in service.⁸

One limitation surprises homeowners: the building must have “allowable depreciation,” meaning it must be used in a trade or business or held for income production.⁹ A home you simply live in does not qualify for the federal credit. The credit works for rental properties, offices, bed-and-breakfasts, and other income-producing uses. Many states run their own historic rehabilitation credits that do cover owner-occupied homes, so a separate check of your state’s program is worth doing.

On the cost side, historic ownership tends to carry higher insurance premiums. Historic properties often require “reproduction cost” coverage rather than standard replacement cost coverage, because insuring the home means budgeting for period-appropriate timber, artisans who can match ornamental plasterwork, and masonry that blends with what’s already there. Those specialized labor and material costs push premiums above what a comparable-sized modern home would require.

Maintenance follows the same pattern. Repairing original wood windows costs more than swapping them for vinyl, and in a local historic district, swapping to non-matching materials may not be allowed in the first place. The Secretary of the Interior’s Standards favor repair over replacement, and local commissions usually hold the same line. Budgeting for ongoing maintenance in period materials is the most effective way to avoid larger restoration bills later; neglect compounds quickly on older buildings.

If you are buying a home that already carries a local historic designation, ask the local preservation commission for its design guidelines before closing. Knowing which exterior changes need approval, which materials are acceptable, and how long review takes will save unpleasant surprises after the sale is final.

1
eCFR. 36 CFR Part 60 National Register of Historic Places
2
eCFR. 36 CFR 60.4 Criteria for Evaluation
3
National Park Service. 36 CFR Part 67 Historic Preservation Certifications
4
National Park Service. Differences Between the National Register of Historic Places and the National Historic Landmarks Program
5
National Park Service. Section 106 Compliance Program
6
eCFR. 36 CFR 60.6 Nominations by the State Historic Preservation Officer
7
National Park Service. The Secretary’s Standards for Rehabilitation
8
Office of the Law Revision Counsel. 26 USC 47 Rehabilitation Credit
9
Internal Revenue Service. Rehabilitation Credit