HomeMy WebLinkAboutSubterranean Structure Jt CCPC study session 61119Subterranean Structures
City Council / Planning Commission Joint Study Session -June 11, 2019
9/19/18 City Council Direction
Garage/Storage Room/Mechanical Room
Address: 20408 Hill Avenue
PDR16-0010, 1/11/17
BP17-0505, 11/1/17
Size: 670 sq. ft.
Topmost part of structure:
24”-35” above grade
Addition-Game Room/Quilting Room/Mechanical Room
Address: 14776 Via De Marcos
BP17-1938, 5/16/18
Size: 1,475 sq. ft.
Topmost part of structure:
15”-39” above grade
Garage
Address: 20380 Hill Avenue
PDR17-0014, 9/12/18
Size: 414 sq. ft.
Topmost part of structure: 0” above grade
Basement Theater
Address: 12901 Pierce Rd.
PDR18-0029, 1/9/19
Size: 101 sq. ft.
Topmost part of structure:
0” above grade
•Detached
•Covered on 3 sides
•18”between top of structure and grade
•1,500 sq.ft.max
•Daylighted portion should not exceed 15%of total perimeter of structure
•Not visible from the public right of way
Criteria for Subterranean Structures
•Keep subterranean structure and basement definitions separate
•Clarify that the area of a basement with floor area directly above
(including porches enclosed on 3 sides)should be counted as
basement
Criteria for Subterranean Structures
Criteria for Subterranean Structures
“Top of structure is min. 18” below natural and/or finish grade, whichever is lower”
Criteria for Subterranean Structures
“Detached”
Subterranean Structure
City Permitted Note
Hillsborough No
Los Altos Hills Yes <1,500SF, 18” below natural grade
Los Gatos No
Monte Sereno No
Portola Valley No Daylighted basement garage not permitted
Woodside Yes Basement size is driven by maximum allowable grading.
No more than 50% of max allowable basement grading to
create basement area that is not located under an above
grade structure. 2.5’ of soil between finished grade and
top of basement structure.