The Secretary of the
Interior's Standards for Rehabilitation
ten basic principles created to help preserve the distinctive
character of a historic building and its site, while allowing for
reasonable change to meet new needs.
- A property shall be used for its historic purpose or
be placed in a new use that required minimal change to
the defining characteristics of the building and its
site and environment.
- The historic character of a property shall be
retained and preserved. The removal of historic
materials or alteration of features and spaces that
characterize a property shall be avoided.
- Each property shall be recognized as a physical
record of its time, place, and use. Changes that create
a false sense of historical development, such as adding
conjectural features or architectural elements from
other buildings, shall not be undertaken.
- Most properties change over time; those changes that
have acquired historic significance in their own right
shall be retained and preserved.
- Distinctive features, finishes, and construction
techniques or examples of craftsmanship that
characterize a historic property shall be preserved.
- Deteriorated historic features shall be repaired
rather than replaced. Where the severity of
deterioration requires replacement of a distinctive
feature, the new feature shall match the old in design,
color, texture, and other visual qualities, and where
possible, materials. Replacement of a missing feature
shall be substantiated by documentary, physical, or
- Chemical or physical treatments, such as
sandblasting, that cause damage to historic materials
shall not be used. The surface cleaning of structures,
if appropriate, shall be undertaken using gentlest means
- Significant archeological resources affected by a
project shall be protected and preserved. If such
resources must be disturbed mitigation measures shall be
- New additions, exterior alterations, or related new
construction shall not destroy historic materials that
characterize the property. The new work shall be
differentiated from the old and shall be compatible with
the massing, size, scale, and architectural features to
protect the historic integrity of the property and its
- New additions and adjacent or related new
construction shall be undertaken in such a manner that
if removed in the future, the essential form and
integrity of the historic property and its environment
would be unimpaired.
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