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Overview

Published April 2008, mailed by NPS’s National Register program to state historic preservation officer staff

For preparers of New Jersey and National Registers of Historic Places nominations and fellow SHPO staff.

• Download PDF

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This paper is intended to supplement not replace information in the National Register Bulletins and other NPS publications. If discrepancies are found between this paper and other NPS publications, the guidance in existing publications should be considered correct. Comments are welcome and should be directed to the author. After review and discussion, the substance of this paper may be incorporated into future publications.

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Summary

[/vc_column_text][vc_column_text css=””]Created by NJ AI Assistant (GPT-4o) and edited by NJHPO staff.[/vc_column_text][vc_row_inner el_class=”hpo-callout-text”][vc_column_inner][vc_column_text css=”” el_class=”hpo-intro-paragraph”]This white paper discusses how to evaluate the significance of additions to historic properties for the National Register of Historic Places. It highlights the need for clear guidelines, especially for additions less than 50 years old, to determine if they contribute to a property’s significance.[/vc_column_text][vc_column_text css=””]When assessing the integrity of a property with additions, consider the date and physical character of the addition, as well as how it impacts the property’s historic integrity. This is especially important when dealing with additions that might clash with the original building’s design. Handling differs depending on whether the property is listed:

• For properties already listed, the addition might extend the recognized period of significance, sometimes requiring an amendment to the nomination.
• For new nominations, the addition’s impact on the period of significance and its contribution to the property’s significance is crucial.

When evaluating additions, different criteria apply based on the property’s significance.

• Properties listed under Criteria A and B (significant events and persons, respectively) usually have a long period of significance, so additions need to be constructed within that timeframe.
• For properties with architectural significance under Criterion C (characteristics), additions must be compatible in design and may need to possess architectural importance on their own.

The paper also discusses the impact of additions on historic integrity, using guidelines from the Secretary of the Interior’s Standards for Rehabilitation (also within a larger PDF version of the Standards). Additions should be sympathetic to the original design, not mimic it entirely, and should not overwhelm or obscure significant features. They should respect the property’s character and not create a false sense of history. Overall, the paper offers principles to help evaluate whether additions contribute to a property’s historic significance.[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][vc_column width=”1/4″ css=”.vc_custom_1758815062001{margin-bottom: 32px !important;}”][info-box-shortcode icon=”fa fa-solid fa-rectangle-list” title=”Table of Contents”]

• Introduction
• General Approach for Evaluating Integrity
• Relationship to Qualifying National Register Criteria and Criteria Consideration G
  • Continuing significance
  • Significance for Design
• Impact of Additions and Accretions on Historic Integrity
  • Compatibility
  • Accurate Representation
  • Protection of Significant Features and Reversability[sic?]
  • Visibility
• Some General Principles to Follow
• Appendix: Secretary of the Interior’s Standards for Rehabilitation

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