Interpreting the Standards (ITS) Bulletins are prepared by Technical Preservation Services to explain rehabilitation project decisions made by the National Park Service in its administration of the Federal Historic Preservation Tax Incentives Program. The Secretary of the Interior's Standards for Rehabilitation are used to determine if a rehabilitation project qualifies as a "certified rehabilitation" pursuant to relevant sections of the Internal Revenue Code. The Standards comprise the sole regulatory basis for determining whether or not a rehabilitation is consistent with the historic character of the structure and, where applicable, the district in which it is located. The relevant Standards are referenced at the top of each bulletin. The bulletins are case-specific and are provided as guidance only. They are not necessarily applicable beyond the unique facts and circumstances of each case.
1. Interior Plan: Changes to Shotgun Interior Plan
2. Garage Door Openings: New Infill for Historic Garage Openings
3. New Additions: New Additions to Mid-Size Historic Buildings
4. Exterior Doors: Inappropriate Replacement Doors
5. Exposed Interior Brick: Removing Interior Plaster to Expose Brick
6. Significant Spaces: Preserving Historic Church Interiors
7. Interior Finishes: Painting Previously Unpainted Woodwork
8. Interior Alterations: Interior Alterations to Detached Residences to Accommodate New Functions
9. Porches: Inappropriate Porch Alterations
10. Stair Tower Additions: Exterior Stair/Elevator Tower Additions
11. School Buildings: Interior Alterations to School Buildings to Accommodate New Uses
12. School Buildings: Rehabilitation and Adaptive Reuse of Schools
13. Storefronts: Repair/Replacement of Missing or Altered Storefronts
14. Adding New Openings: New Openings in Secondary Elevations or Introducing New Windows in Blank Walls
15. Industrial Interiors: Treatment of Interiors in Industrial Buildings
16. Loading Door Openings: New Infill for Historic Loading Door Openings
17. Interior Parking: Adding Parking to the Interior of Historic Buildings
18. New Additions: New Additions to Mid Size Historic Buildings
19. Interior Finishes: Deteriorated Plaster Finishes
20. School Buildings: Converting Historic School Buildings for Residential Use
21. Adding New Openings: Adding New Openings on Secondary Elevations
22. Adding New Openings: Adding New Entrances to Historic Buildings
23. Windows: Selecting New Windows to Replace Non-Historic Windows
24. Corridors: Installing New Systems in Historic Corridors
25. Interior Finishes: Altering the Character of Historically Finished Interiors
26. Entrances and Doors: Entrance Treatments
27. Awnings: Adding Awnings to Historic Storefronts and Entrances
28. Corridors: Corridors in Historic Highrise Apartment Buildings and Hotels
29. Garage Doors: Adding Vehicular Entrances and Garage Doors to Historic Buildings
30. New Entries: New Entries on Mill Buildings
31. Interior Features: Retaining Distinctive Corridor Features
32. Roofing Materials: Slate Roof Treatments
33. Secondary Elevations: Alterations to Rear Elevations
34. Additions: Completing Never-Built Portions of a Historic Building
35. Interior Plans: Changes to Shotgun Interior Plan
36. Rooftop Additions
37. Rear Additions: Rear Additions to Historic Houses
38. Alterations Without Historical Basis
39. Site and Setting: Changes to Historic Site
40. Corridors: Corridors in Historic School Buildings
41. Incompatible Alterations to the Setting and Environment of a Historic Property
42. Industrial Bridges in Mill Complexes
43. Converting Fire Escapes to Balconies in Mill Complexes
44. Subdividing Significant Historic Interior Spaces
45. Adding or Modifying Fly Lofts on Historic Theaters
46. Modifying Historic Interior Railings to Meet Building Code
47. Rooftop Additions on Mid-Size Historic Buildings
48. Replacement of Missing or Altered Storefronts
49. Designing Compatible Replacement Storefronts
50. Reusing Special Use Structures
51. Installing New Systems in Historic Buildings
