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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.