As defined by the San Francisco Building Code, a sub-sidewalk basement is that part of the underground building structure which extends into the public right of way.

Both the Department of Building Inspection (DBI) and the Public Works are responsible for different parts of the sub-sidewalk basement process. 

• Department of Building Inspection: DBI is responsible for the design review, permitting and construction inspection of the sub-sidewalk basement structure.

• Subdivision and Mapping Fee Schedule
• Permit Fee Schedule
• Permit Fee Schedule Brochure

A banner permit grants permission to temporarily occupy any City-owned utility poles (primarily poles with streetlights but no utility wires) for the purpose of providing notice to residents and visitors of San Francisco about City-sponsored, City-funded, City-wide special events and locations of the City's diverse neighborhoods. Article 5.7 Section 184.78 (PWC) 

Please apply online here.

You can find Subdivision Code at American Legal Publishing Corporation.

ADDITIONAL RESOURCES

• Check for Street and Sidewalk work on your street

• Department of Building Inspection

• Accela

• Inspection Services, DBI

You can search for your permit here.