Addition Resource Guide

A permit is required to construct an addition on your premise. If you have hired a contractor(s) to perform the work, they must obtain a Contractor's Business License with the village before a permit can be issued. If you have any questions, please contact the Permitting Division of the Community Development Department at 847.923.4420.

Current Fee:

  • Conditioned - $930
  • Unconditioned - $440

Submittal Requirements:

  • Village permit application -Residential
  • 2 copies of your Plat of Survey with structure drawn to scale.
  • 2 sets of sealed and signed architectural drawings depicting floor plan indicating locations of windows, doors, electrical receptacles, lights and switches.
  • Section view showing footing, foundation, wall, roof and ceiling structure.
  • Rough site plan showing location of addition. Show full dimensions for new driveways or patios so that square footage may be determined.
  • Elevations showing all exterior sides of addition.
  • All loads are required to be shown on plans for habitable room additions.
  • Electrical permit application is required for electrical work along with layout.

Required Inspections:

  • Prepour - before all footing, foundation and slab pours.
  • Rough inspection - framing, plumbing, electrical and mechanical.
  • Insulation
  • Active roofing
  • Final inspection - framing, plumbing, electrical and mechanical.

Inspections can be scheduled up to 4pm the business day prior to the requested inspection date by contacting the Permitting Division of the Community Development Department at 847.923.4420.

Code Requirements:

Room additions must meet the same zoning requirements as the existing dwelling.  In other words:

  •  It cannot be built in front of the 30-foot setback line.
  •  It may be built in the side yard providing 10 percent of the yard width at the 30-foot setback line is maintained.
  •  If constructed in the rear yard, the 30-foot rear yard should be maintained. In other words, from the proposed wall closest to the rear lot line, at least 30-feet should be maintained.
  • Shall comply with the floor area ratio requirements of the zoning district. 

Listed below are some specific construction requirements for room additions:

  • Total Glass Area:  Not less than 8 percent of floor area of room.
  • Ventilating Area:  Not less than 4 percent of floor area of room. 
  • Doors:
    • Exterior Service Doors: 2' 8" x 6' 8" minimum       
    •  All habitable rooms and bathroom doors: 2'4" x 6'8" minimum.

    • Powder Room Doors:2'0'' x 6'6'' minimum.
  • The minimum ceiling height for a room addition is 7'6''
  • Provide adequate vapor barrier and insulation in floor, wall, and ceiling, and cover wall and ceiling with 1/2'' drywall.
  • All connections to existing structures shall be to bare wood. Such as  new roof and wall connections.
  • All foundation walls shall extend a minimum of 3'6'' below grade and should be doweled into existing foundation. 
  • A minimum of 2, #4 reinforcing bars shall be placed within 18 inches at the top and bottom of all foundation walls where concrete footing and wall has been installed for building construction. 
  • A minimum of 2, #4reinforcing bars shall be installed to encompass all window and/or door openings in all concrete footing and wall applications.  Said reinforcing rods shall be arranged around all window and/or door openings in concrete footing and wall applications in a manner as designed by an Illinois registered architect
  • Roofing and siding material should match existing dwelling.
  • Slab Floors:  4" of concrete, 4'' of gravel fill, and 6 mil. vapor barrier.
  • Anchor Bolts: 10"  long x ½” diameter with nut and washer.  Maximum 6’ on center.
  • All underground waste piping shall be 4” Schedule 40 PVC minimum.
  • Provide cleanouts at the base of all stacks.
  • Air Cushions:  18” for risers and 12” for fixtures.
  • Shall have at least one switched receptacle.
  • If an extra bathroom is installed in addition, it shall have at least one switched receptacle with ground fault interrupter.
  • If a window is not provided in above-mentioned bathroom, a ventilation fan shall be installed and fan shall be switched separately. Room size shall dictate type of fan used. Duct fan to outside air.
  • Wall receptacles shall be located a maximum of every 12 lineal feet of wall space.