Room Additions - Residential

This guideline has been developed to identify the minimal submittal requirements for a permit application to build an addition to/or remodel a single-family residence. The information provided contains, and is not all-inclusive to, the City of Wheaton’s adopted Building Codes, Ordinances, and inspections required for this type of project. Please review this information and call the phone numbers provided should you have any questions.

Required Submittals
The following documents, forms, and/or permits must be submitted prior to the plan review. Referenced forms are available on the Building and Code Enforcement website and can be accessed throughout this document by following the appropriate link.

Application for Permit - When filling out the application for the permit, include all required information that is pertinent to the proposed scope of work such as; site address, description of work, contractors to be used on the job and their respective costs per trade, total cost of work to be performed, complete applicant contact information, etc. Please refer to the document titled Building Application for Permit.

Architectural Plans - Please submit two (2) complete sets of architectural plans and any other required documentation that will be necessary to complete the review of the construction documents.

Contractor Requirements - See Contractor Requirements.

Grading Plan Requirements Type I - Please submit two (2) copies. Please call our Development Engineer at 630-260-2868 should you need further information. Please refer to document titled Grading Plan Requirements - Type I for specific requirements

Combustion Air Calculation Worksheet - Fill this form out only if adding a new furnace or hot water heater and/or constructing a room with an existing furnace or hot water heater. Please refer to the document titled Combustion Air Calculation Worksheet for additional information.

Water Service Line (Sizing) - This form must be completed only if you are adding any additional plumbing fixtures to the residence. The Illinois State Plumbing Code has specific requirements as to how many fixtures within a residence can be served by specific water service sizes. Please refer to the document titled Water Service Line - Sizing. This form will calculate the proposed “fixture count” for your home. Please submit this completed form and a site plan indicating the required minimum 10’ separation between the proposed service and the existing sanitary service with your building plans. After this form is submitted to the Building Department, it will be forwarded to our Water Division to determine the required size of the water service for your house. Based on their records, they will determine if either the existing water service line for your home is adequate in size to remain in compliance with State law, or if the water service line from the main to the house needs to be replaced with a larger diameter water service. There is a variance process that can be pursued to obtain a waiver for a required water service upgrade through the State of Illinois regulations. You may call our Water Department at 630-260-2090 should you need additional information.

Sewer Permit - The sanitary sewer system in Wheaton drains to and is serviced by the Wheaton Sanitary District or DuPage County, see attached map to determine which agency you will need to contact to obtain a sewer permit from them. Each agency has its own submittal requirements available on their web page, once approved please provide a copy of the permit, or copy of the email if "no permit required" from Wheaton Sanitary District, to the Wheaton Building Department.

Wheaton Sanitary District: 1 S 649 Shaffner Rd. Wheaton, Il 60189, 630-668-1515, e-mail completed application to

DuPage County - Public Works Department: 421 N. County Farm Rd. Wheaton, Illinois 60187, 630-407-6800, Fax 630-407-6701,

Addition to a single-family dwelling, less than 800 sq. ft. does not require a sewer permit. 

Architectural Plan Requirements
The construction documents shall be prepared, signed, and sealed by a registered Illinois Design Professional for all new residential additions exceeding 500 square feet in total area, and all 2nd story additions. Where special conditions exist, the building official is authorized to require additional construction documents to be prepared by a registered design professional. Provide two (2) copies of Architectural Plans that indicate the following information (Please note, if the scope of remodeling includes an existing space, then two (2) floor plans must be submitted: an “Existing Floor Plan” and a “New Proposed Floor Plan”):

Floor Plan:
The Floor Plan must be drawn to scale, presented in architectural style, and include the entire scope of work that is to be performed. If the existing layout of the home is to be adjusted, then a separate Demolition Plan must be submitted that depicts the existing layout of the home and specifically identifies all of the elements that will be removed as part of the project. All submitted plans should indicate the specific elements of the home (such as structural, electrical, mechanical, plumbing, windows, doors, etc.), indicate all dimensions, and label the use of all indicated spaces.

Cross Section Detail:
The cross-section shall depict the overall specifics of both the assembly and materials for the addition that will be constructed. Be sure to include foundation specifications, floor assemblies, wall assemblies, roof and ceiling assemblies, finish material specifications, and any other items pertinent to the construction of the addition. Additionally, all building materials must be identified and specifics (such as grade, dimensions, and spacing) for these materials must be provided.

Stair Detail:
A stair detail that provides the specifics of the stairway that will be constructed must be included. Be sure to include the riser height, the tread depth, the amount of stair headroom, guardrail specifications, and the height of the required handrail that is to be installed.

Elevations Detail:
Please provide elevations of the home depicting the installation of the proposed addition. Be sure to include all of the specifics such as the foundation system, the exterior finish materials, all windows and doors, the roofing materials, any decks or porches, and any other specifications that are unique to the exterior of the proposed addition. Be sure to dimension the heights of the addition from grade to peak, and from grade to footing.

Roof Plan Detail:
A roof plan that provides the structural specifics of any existing or proposed roofs that will be adjusted or affected by the proposed addition. Be sure to include all rafter sizes, spacing, and spans; all hip and valley rafter sizes; roof venting type, sizes, and locations; and any other pertinent information unique to your project (such as skylight locations and framing requirements).

Plumbing Isometric Plans for both Supply and Waste/Vent systems must indicate:
Piping materials, sizes, locations, fixtures, floor drains, hot water heater, ejector pit/overhead sewer, shutoffs, and any other pertinent items that are integral parts of the respective systems.

Current Codes - Building
See the document titled Current Codes that identify codes that may be applicable to your construction project.

Significant Codes - Building
Demolition and Construction Regulations
During construction, it is important that you inform your workers to abide by the Codes and Ordinances of the City of Wheaton, especially those that are identified in the Demolition and Construction Regulations guideline.

Smoke Alarms & Carbon Monoxide Detectors
The 2018 International Residential Code requires that Smoke Alarms are required to be installed within each sleeping area, in the hallway directly adjacent to sleeping areas, and one per floor minimum (including the basement). The Smoke Alarms are all required to be powered by a commercial power source, interconnected so that the activation of one alarm will activate all of the alarms, and each alarm must have a battery backup. The State of Illinois requires Carbon Monoxide Detectors to be installed outside each separate sleeping area in the immediate vicinity of the bedrooms. (2018 IRC R314 – Smoke Alarms)

Egress Windows
The 2018 International Residential Code (2018 IRC R310.6; Wheaton Ordinance) requires that each sleeping area must have a minimum of one egress window located within the room. Basements with habitable space are also required to have at least one emergency egress window. The required specifications for Emergency Egress Windows are as follows:

  • Minimum 5.7 square feet clear opening with the normal operation of the window;
  • Minimum clear opening height of 24”;
  • Minimum clear opening width of 20”;
  • Maximum sill height of 44” above the finished floor;
  • No special knowledge, hardware or equipment required to operate the window;
  • A basement egress window requires a minimum 3’x3’ clear area within escape well. If the escape well is greater than 44” below grade in-depth, a permanent ladder must be mounted to the side of the window well. (2018 IRC R310.6; Wheaton Ordinance).

Insulation Requirements
The 2018 International Energy Conservation Code states that the following R-values are required for the specific structural elements that are listed as required to be insulated:

  • Exterior Walls - R-20
  • Ceilings separating conditioned spaces from unconditioned spaces, as well as Cathedral Rafters - R-49
  • Crawlspace Walls (Continuous) - R-15
  • Crawlspace Walls (Cavity) - R-19
  • Unfinished Basement Walls (Continuous) - R-15
  • Unfinished Basement Walls (Cavity) - R-19
  • Floors above unconditioned space - R-30
  • Ductwork running through attic spaces - R-8
  • Ductwork running through other unconditioned spaces - R-6

The method for obtaining these R-values must be specifically indicated on the plans. These R-values must be obtained independently of any other structural components other than the insulation itself. Exposed insulation must have a flame-spread index not to exceed 25 and an accompanying smoke-developed index not to exceed 450. The vapor barrier is to be installed on the warm side of the perimeter wall. (2018 IRC N1102.1.1; Wheaton Ordinance)

Combustion Air Calculation
The 2018 International Residential Code requires that anytime gas-fired mechanical equipment is placed in a confined space or within a structure deemed of “unusually tight construction, makeup combustion air that is obtained exclusively from the exterior of the structure must be provided to allow for the proper operation of the mechanical equipment. Please see the document titled Combustion Air Calculation Form in order to determine the required size of each of the supply vents (one opening must be within 12” of the ceiling, the other within 12” of the bottom of the enclosure) that must be installed. (2018 IRC G2407 - Combustion Air)

Overhead Sewer
As per the Wheaton Ordinance, for any new, remodeled, or enlarged basements Overhead Sanitary sewer service is required. The entire basement must be served by this system. Please indicate the proposed location for the sanitary pit on the required plumbing plan diagram. (Wheaton Ordinance O-2020-05; Section 22-17 Wheaton Municipal Code).

Significant Codes - Zoning
See document titled Zoning Requirements for Residential Districts

Permit Fees
For associated Planning, Engineering and Building fees, please refer to Appendix B7 Fee Schedule per the Wheaton City Code - Community Development Fees.

For associated Sewer and Water fees, please refer to Appendix B8 Fee Schedule per the Wheaton City Code - Public Works/Sewer & Water Fees.

The inspections listed here are required for all Residential Addition Remodeling projects. Additional inspections may be needed based upon the scope of work for your project. A complete list of your required inspections will be listed on the Plan Approval Notice that will be attached to the approved plans.

Type of Inspection
When to Call
Once forms are in place but prior to pouring concrete.
Underground Electrical and or Plumbing
Call after the pipe is laid, but the pipe must be inspected prior to concealment.
Basement Floor & Garage Slab
Once prepared, but prior to pouring concrete.
Electrical Service
Inspection of meter, ground, main service panel, temporary wiring method, and weather protection.
Rough Framing; Rough Mechanical; Rough Electrical; Rough Plumbing
Rough inspections must be conducted once all rough-ins are complete, but prior to concealment.
Masonry Fireplace Firebox
Once the fireplace is constructed to the smoke shelf.
Prior to drywall installation.
Conducted when the project is complete.

To Schedule an Inspection
Please call 630-260-2050 between 8:00 a.m. and 5:00 p.m. Monday through Friday. Plumbing inspections are available on Tuesday or Thursday only. Please allow for a minimum of 24 hours notice when scheduling inspections. Inspections must be scheduled no later than 3:30 p.m. the day before the desired inspection date. Inspection Scheduling Guideline.

Construction Site Regulations
For job site regulations such as hours of work, safety fencing, parking of construction vehicles and similar see guideline titled Demolition and Construction Regulations.

Websites - City of Wheaton - International Building Codes - Illinois Department of Health website (2014 Illinois Plumbing Code information)

Contact Us
City of Wheaton Building & Code Enforcement Department:
Address: 303 W. Wesley Street, Wheaton, IL 60187
Phone Calls:
Submittal Questions: 630-260-2050
Inspection Scheduling: 630-260-2050
Building Code Questions: 630-260-2051
Business hours: Monday - Friday 8:00 a.m. - 5:00 p.m.
Fax: 630-260-2195

Revised 3/12/2020