* For authority of city to regulate construction and materials to prevent the erection of unsafe buildings, etc., see Gov. Code, § 38660.

For provisions that superintendent of streets shall enforce provisions pertaining to house numbering, see § 2-8 of this Code. As to duties of the housing advisory and appeals board pertaining to unsafe buildings and repair procedures, see § 2-13. For provisions pertaining to the construction of signs and billboards, see §§ 3-2 to 3-21. For provisions pertaining to building and electrical permits for signs and billboards, see § 3-6. As to electricity, see Ch. 11. For requirements for buildings to be kept free of rats, see § 16-44. As to housing, see Ch. 17. For powers and duties of building official pertaining to housing, see § 17-4. As to labor camps, see Ch. 18. As to plumbing, see Ch. 26. For provisions pertaining to excavations, see §§ 30-13 to 30-18. As to subdivisions, see Ch. 31. For requirement that trees be protected during construction, see § 35-14.