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DEVELOPMENT SERVICES DEPARTMENT
BUILDING INSPECTION DIVISION

Addition permit

GENERAL REQUIREMENTS:

  1. Plans shall be drawn to scale on substantial paper (minimum size of 18" x 24" ) and shall be legible and of sufficient clarity to indicate the nature and extent of the work proposed.
  2. Plans shall be fully dimensioned and shall show, in detail, how the proposed work will conform to the requirements of the Building, Electrical, Plumbing, and Mechanical Codes as well as all other applicable laws, ordinances, rules, or regulations.
  3. Specifications or plans shall indicate the type and grade of all the materials used in the proposed work.
  4. Plans drawn in pencil or other readily changeable medium are unacceptable.
  5. Plans shall contain the job address, the name and address of the owner of the property and the name, address, and signature of the person who has prepared the plans.
  6. Plot plans shall be drawn to a scale of not less than 1" = 20'-0" or 1/16" = 1'-0.
  7. Floor plans, elevations, etc. shall be drawn to a scale of not less than 1/4"=1'-0.
  8. All dimensions shall be indicated clearly on the plans, a plans checker will not check the dimensions.

The items described below are the minimum requirements for specific projects. Additional plans and information may be required before a plan review can begin. 

RESIDENTIAL ADDITION

  1. Plot Plan drawn to a scale of not less than 1" = 20'-0" or 1/16" = 1'-0".Plot Plan shall show:
    1. The size and shape of the property including dimensions.
    2. The location of all existing buildings and structures on the property, showing distances from property lines and from each other.
    3. The location of any easements, driveways, power poles and lines, waterways, septic and drainage fields, storm drains, curbs, gutters, sidewalks, and utility services and lines.

    The area of the addition and of the existing structure.

  2. Floor plan(s) of the addition and the adjacent rooms. For a Patio Enclosure provide a floor plan drawn including any adjacent rooms and the use of each room. Show the size, location, and type of all doors, doorways, windows and skylights within the rooms.
  3. Foundation plan of the addition drawn to a scale of not less than 1/4"=1'-0". Plan to show size and type of foundation system proposed, and how the new foundation relates to the existing.
  4. Foundation sections showing depth and width of footings, height and width of stem wall, size and location of re-enforcing steel bars, size and grade of mudsills. For slab foundations provide details of steel and concrete.
  5. Floor framing plan(s) if addition has a raised wood floor drawn to a scale of not less than 1/4"=1'-0" indicating the size and spacing of floor joists, girders and beams.
  6. Roof plan of the addition and the area of the roof adjacent to the addition drawn to a scale of not less than 1/8"= 1'-0". Plan to indicate how the new roof ties into the existing.
  7. Roof framing plan drawn to a scale of not less than 1/4"=1'-0" indicating the size and spacing of rafters and any beams supporting the roof structure, and how the framing ties into the existing roof framing.
  8. Exterior elevations of the addition drawn to a scale of not less 1/4" = 1'-0". Elevations to indicate the height and shape of the roof, roof pitch, and type of roof covering and the proposed ground line.
  9. A cross section(s) drawn to a scale of not less than 3/8" = 1'-0". Cross section(s) to indicate how the horizontal framing members are supported from the roof to the foundation, including bearing walls, beams and any intermediate floor or roof framing.
  10. Details of the foundation, roof and floor framing drawn to a scale of not less than ½" = 1'-0".
  11. Title 24, California State Energy Regulations, calculations and documentation. Forms CF-1R and the Mandatory measures shall be printed on the plans.
  12. A soil report and, in some cases, a geologic report prepared in accordance with Alameda County requirements may be required. For further information on soil and geologic report requirements ask for our handout on soil and geologic reports.

Note: Some of the above plans may be combined provided that all information required is clearly shown.

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