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Accessory Buildings -- Plans

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All construction drawings must be legible and submitted in duplicate. Plans may be blueprints or originals on a good grade of plain white paper. Plans must either be drawn to scale or with all dimensions clearly shown. The following list includes the types of drawings needed for a typical detached garage, shed or other accessory building, whether new or remodel.  If you need additional information, please contact Building Inspection at (303) 651-8332 or

PLOT PLAN (see sample plot plan)

  1. North Arrow.
  2. Date of plan (and revisions).
  3. Property address.
  4. Lot dimensions and corner elevations.
  5. Easements and adjoining street name(s).
  6. Curb cuts, paving, parking, sidewalks and garage locations.
  7. Location of proposed and existing structures including house, detached garages, and sheds.
  8. Show dimensions of all buildings, distance to property lines and distance between buildings.
  9. Height of structure, top of foundation and property corner elevations.
  10. Location of utility lines inclusive of water, sewer, electric and gas lines. Show point of attachment to house.
  11. Drainage pattern (must conform to approved development drainage plan).
FOUNDATION PLAN (done by a licensed engineer)
  1. Dimensions of footing and foundation wall.
  2. Overall foundation dimensions.
  3. Depth of footings below grade.
  4. Column footing size and locations.
  5. Beam size and bearing locations.
  6. Reinforcing steel size and anchor bolt size and locations.
  7. Windows, vents, and access size and locations.
  1. Building section with material specifications (see a sample building section).
  2. Grade and species of all wood framing members.
  3. Size, location and spacing of studs, joists, rafters, pre-engineered trusses, hips, valleys, purlins, and struts.
  4. Size and location of beams, columns and headers.
  5. Roof and floor sheathing materials.
  6. Bracing details.


  1. Exterior elevation - (Label FRONT, REAR, RIGHT, LEFT). Indicate building materials to be used. Finish grade with slope shown.
  2. Floor plan for each level (see a sample floor plan)
    1. Label rooms, and show dimensions.
    2. Location and size of walls, windows, doors, stairs, cabinets, guardrail and window wells.
    3. Plumbing fixtures, water heater, furnace, boiler, air conditioner and cooking appliance locations.
    4. Location of chases and chimneys for venting of fuel-burning appliances (specify type of fuel).
    5. Type, size R-value of insulation in walls and ceiling. (walls R-18, attic R-38)
    6. Fireplace or stove location, type and installation details.


  1. Size of service.
  2. Location of panel.
  3. Electrical plan with outlets, switches, fixtures and smoke detectors.




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