Multi-Family Addition

When the location of any part of the exterior walls and roof of a multi-family residence are changed, an addition permit is required. Examples would be single or multi- story addition, screen or open porch with roof, 3 season room, etc.

See below for permit submittal requirements and general information.

Application Requirements

• Permit Application Packet (PDF) - The documents below have been combined into one PDF file.
  1. Permit Application
  2. Non-Residential Zoning Worksheet
  3. Building Site and Utility Data Worksheet
  4. Water Service and Meter Worksheet
  5. Fire Protection – Letter of Understanding (only if a separate Fire Protection permit is required)
  6. Contractor of Record (Contractor License Requirements / Contractor License Application)

Application Fees & Deposits

• Permit Application Deposit - $750 (Due at time of permit application submission)
• Building Construction and Inspection Fee - $200 minimum fee for up to 1,500 square feet ($25 per additional 1,000 square feet over 1,500) (Due at time of permit pick-up)
• Additional fees may apply at time of permit pick-up

Drawing Requirements (To Be Submitted With Permit Application)

• Construction Documents - 4 sets* (see Architectural Drawing Requirements (PDF))
• Civil Drawings - 4 rolled sets* (See below)
  • If under 400 square feet, see Civil Engineering Submittal Guidelines Under 400 Square Feet (PDF)
  • If over 400 square feet, see Civil Engineering Submittal Guidelines Over 400 Square Feet (PDF)
• Plat of Survey - 4 copies (survey must be sealed and be “to scale”)

*The Village of Northbrook Standard Detail Sheet should be included within the civil engineering drawing set.

Separate Permit Requirements

The following may occur with the construction of an addition to a single family and require a separate permit:

• Tree Removal
• Fence
• Back-Up Generator
• Elevator (PDF)
• Swimming Pool
• Finishing of Basement/Attic Space (PDF) (if not shown on the approved drawings for this addition)
• Deck/Patio (if not shown on the approved drawings for this addition)

Construction Submittal Requirements

The following may apply during the course of construction:

• Permit Revision Application (PDF)
• Spot/Location Survey Approval Application (PDF) - Required only if a Zoning Variation was granted
• Energy Certificate and Instructions (PDF) - Included in permit documents returned to applicant upon permit pick-up

Required Inspections

See Guidelines For Scheduling Permit Inspection (PDF) for more information.

• Final Inspection Checklists Used by Inspectors (Building (PDF), Electrical/Mechanical (PDF), Plumbing (PDF))

Additional Resources

• Insulation Changes During Construction
• Basic Zoning Information (PDF)
• Typical Residential Building Construction Notes (PDF)
• Certificate of Occupancy Request (PDF)
• Energy Code (2015 IECC) Information
• Impervious Surface Fee Information (PDF)
• Impervious Surface Fee Map (PDF)