304.1 Work considered an alteration under the Act shall include, but is not limited to, any of the following, regardless of whether or not the work is visible from public space:

1. (a) Any alteration as defined in Chapter 99;
2. (b) Any addition to the building envelope;
3. (c) Any alteration or repair that does not involve replacement in kind of an architectural feature, including removal of an architectural feature such as ornamentation or historic signage;
4. (d) Construction of a projection into public space;
5. (e) Installation or replacement of a window, door, siding, roofing, or other exterior building finish;
6. (f) A change in the exterior appearance of a window due to work for which a permit is required;
7. (g) Installation of an awning, sign, or other advertising device;
8. (h) Construction or replacement of a retaining wall, fence, deck, patio, garden storage shed, swimming pool, or other site feature;
9. (i) Installation of air conditioning, mechanical, plumbing, or other equipment;
10. (j) Erection of a flagpole, antenna, satellite dish, or telecommunication tower;
11. (k) Sandblasting and similar types of abrasive cleaning; and
12. (l) Paint stripping where a permit is required.

304.2 Pursuant to § 107 of the D.C. Construction Code, a permit is required for various minor repairs to historic landmarks or properties within historic districts, even though a permit is not required for the same work on non-historic properties. Under this provision, the Mayor's Agent shall review permits for the following categories of work:

1. (a) Brick pointing;
2. (b) Replacement of windows and doors;
3. (c) Replacement of roofing and coping;
4. (d) Replacement of siding; and
5. (e) Replacement of retaining walls regardless of height.

304.3 Alteration to a designated interior historic landmark shall not include changes in furnishings.

SOURCE: Notice of Final Rulemaking published at 51 DCR 7447 (July 30, 2004).