1&2 Family Dwelling Code References

  • 2009 International Residential Building Code
  • 2009 International Mechanical Code
  • 2009 International Fuel Gas Code
  • 2008 National Electrical Code
  • 2014 Illinois Plumbing Code
  • 2015 Illinois Energy Conservation Code

Code books may be purchased directly from International Code Council. Code and commentary books are also available for viewing at the Champaign Public Library. Code amendments are available online.

Supplemental Information:

Permit Application/Plans
Submit completed application with one (1) set of building and site plans. Any plans and information pertaining to the grading and drainage, erosion control or sump pump discharge should be separate and attached to those application forms.

Estimated Plan Review Time
Five (5) business days from receipt of all material. Plan review time is subject to application and plans being complete and in compliance with all codes and ordinances.

One and Two Family Permit Review Process

One & Two Family Dwelling permits are processed by three City departments. When a building permit application is submitted to the Building Safety Division at the Champaign Fire Department, it is separated into its component parts and routed to whichever individual inspectors need to review a particular application. The plans and review process are constantly tracked by permitting software. The applicant starts and finishes the permit process at the same location. All departments welcome the chance to review particular portions of applications prior to their formal submission in order to make the permitting process proceed smoothly.


Commercial and Multi-Family Permit Review Process
(click to enlarge)

Permit Fees

One Family Dwelling

  • Less than 2,500 gross square feet = $345
  • 2,500 or more gross square feet = $435
  • Addition/Alteration = $6 per $1,000 of construction costs.

Two Family Dwelling

  • Less than 2,500 gross square feet = $375
  • 2,500 or more gross square feet = $470
  • Addition/Alteration = $6 per $1,000 of construction costs.

Minimum permit fee is $45.

Permit fees are payable when permit is issued. Does not include Plumbing, Electrical, HVAC, Sprinkler, and Fireplace permit fees. These permits and fees are available from the respective inspector.
Permit fees are nonrefundable.


Required inspections are noted on the permit.
We request twenty-four (24) hours notice to schedule inspections.

Inspector’s Office Hours
7:30 – 8:30 am and 3:30 – 4:30 pm


One & Two Family Dwelling Code Checklist

This checklist is for information only. Not to be used as a plan submittal with the application.

Print IRC Handout

Following are the most common omissions/errors on plan submittals accompanying permit applications.  Failure to provide the listed information creates plan review delays that may result in added cost to all concerned.  Please help to expedite your plan review by providing the following information:

1) General

  • Provide a complete set of plans (electronic/ hard copy), which should include a site plan, foundation layout, elevation views, floor plans, floor framing diagrams, and any section views on a minimum dimension of 18” X 24” size prints.  All plans must be to scale.
  • Provide the correct square footage of all floors including basement and garage.
  • Identify all room uses, glazing, and all egress windows; a room with a closet is considered a bedroom.
  • A roofing license number must be supplied before issuance of permit.

 2) Fire Separation Distance

  • Exterior walls with a fire separation distance to lot line of less than 5 feet is required to be 1 hour fire-rated and tested in accordance with ASTM E 119 or UL 263 with fire exposures from both sides.
  • Building projections with a fire separation distance to lot line of greater than or equal to 2 feet to 5 feet is required to be 1 hour fire-rated on the underside.

3) Footings and Foundations

  • Concrete footing sizes and depth (continuous and isolated).  Minimum 32” below grade to bottom of footing.  Include size and             spacing of reinforcement steel if using it.
  • Vapor barrier under all concrete floor slabs including garage with a minimum 12” overlap (minimum 6mil).  Crawlspaces must have the edges of the vapor barrier extend 6” up the stem wall and joints must be glued with an approved material.
  • All plates in contact with concrete (interior and exterior, load bearing and non-load bearing) need to be pressure treated or decay resistance.
  • Provide the thickness and height of basement walls and include size, spacing and grade of the horizontal and vertical reinforcement steel if required.
  • All foundations must meet the necessary reinforcement splicing requirements.
  • Indicate if the crawl space is vented or unvented and if unvented provide the correct amount of exhaust ventilation and conditioned air supply is needed. Calculate 1cfm per 50 square feet.
  • Indicate method of waterproofing of basement walls and name of applicator.
  • Anchor bolts ½” X 10” in solid concrete and ½” X 18” into masonry should be located not more than 12” or less than seven bolt diameters from each end of the plate section and a maximum of 6’ on center.
  • Masonry piers in crawlspace need to be covered with termite shield or the use of pressure preservative treated wood.
  • Transitions between the basement and crawl or slab foundations shall be accordance to ACI 332 or shall be stepped where it is necessary to change the elevation of the footings.
  • Access to crawlspace should be a minimum 18” x 24”.
  • A minimum size #4 footing ground is required for all new 1 & 2 Family Dwellings; provide location on plans.

 4) Floor

  • Indicate either dimensional or engineered floor system.
  • If floor system is an “I” joist system, provide a floor plan showing spacing, size, span and bearing points that indicate what is being used is adequate.  Specify the manufacture and series being used along with cut sheets showing uplift calculations prior to the framing inspection for review.
  • Indicate all sizes, spans and type of beams and girders.  If engineered system, provide cut sheets on deflection calculations.  All steel beams need to be designed to the floor system.  Headers and beams supporting engineered wood joists must be designed by a licensed design professional when the spans of the headers or beams exceed 6 feet.  The design professional must certify that the header or beam design is within the deflection tolerances of the engineered wood joists it supports.  Exception: Engineered wood beams and girders as part of an engineered floor or roof package that is designed under the direct supervision of a licensed design professional.
  • Draftstops shall be installed so that the area of the concealed space does not exceed 1,000 square feet.  This applies to usable spaces both above and below concealed space of a floor/ceiling assembly.  Draftstopping shall divide the concealed space into approximately equal areas.
  • Cantilevered floor joists supporting a load bearing wall shall accordance with Table R502.3.3(1) & Table R502.3.3(2).

5) Framing – Interior and Exterior Walls

  • Specify the size and span of headers for all openings and number of jack studs?
  • Specify type and locations of wall bracing if required.  O.S.B. or plywood used for bracing shall consist of a full (uncut) 4’x 8’ sheet within 12.5’ of each corner and at least every 25’ of continuous wall.  This includes garages.
  • Include a type and an elevation view of the garage wall bracing detail along with all measurements to scale.
  • Any wood, plywood, O.S.B. etc. behind siding or brick veneer shall be protected by an approved water resistive barrier.
  • Class I or Class II vapor retarders are required on the interior side of frame walls in Zones 5, 6, 7, 8, and Marine 4.  Class I and/or Class II vapor retarders are not permitted on both the interior and the exterior sides of frame walls. Any insulation sheathing on the exterior side of the wall must be an unfaced material with a perm rating less than one.
  • Class III vapor retarder may only be used for 2×4 walls with a R-value equal or greater than 5 & 2×6 wall with R-value equal or greater than 7.5.
  • Indicate the wall stud size and spacing.
  • Provide a “complete load path” method that meets the requirements for the transfer of all loads from their point of origin through the load-resisting elements to the foundation.
  • Indicate fastener type, size, and spacing for wall & roof sheathing attachment.
  • All steel lintels shall be shop coated.

6) Wall/Floor/Ceiling Fire-rated Coverings

  • All engineered wood floor joist assemblies constructed above basements, storage areas, habitable spaces, or other accessory areas must be provided with a finished ceiling of a minimum ½” drywall, and one (1) hour fire resistance rating.
  • Enclosed accessible areas under stairs shall be completely drywalled.
  • If there is a living area over the portion of the garage, the garage ceiling and any walls , beams, posts, etc. that are helping to support the second floor shall be protected by 5/8” type X drywall.
  • Dwelling units in a two-family dwelling shall be separated from each other by wall and/or floor assemblies having not less than a 1-hour fire resistance rating or an automatic sprinkler system installed in accordance NFPA 13.
  • Pull down stairs used as attic access in a garage shall have a min. ½” drywall fastened to it.
  • Any two unit buildings designed to be zero lot line single family residences shall be constructed with one of the following:  (All wall types must extend from foundation to underside of roof sheathing)
  1.  A 1 hour fire-resistant rating with an automatic sprinkler system installed in accordance NFPA 13, or
  2. A 2 hour area separation fire wall without an automatic sprinkler system with 4’ of fire rated roof sheathing on each side of the wall, or
  3. Two separate one hour fire-resistant walls without sprinkler system and 4’ of fire rated roof sheathing on each side of fire rated wall.  Walls must have 5/8” Type X drywall on both sides of both fire-resistant walls.
  • Townhouses must be protected by an automatic sprinkler system and a common 1-hour fire resistant-rated wall assembly tested in accordance with ASTM E119 or UL 263 or  be separated by fire walls built in accordance with Section 706 of the International Building Code and shall be classified as independent single-family dwellings.

 7) Roof/Ceiling Construction

  • Roof assemblies shall have rafter or truss ties provided at each rafter or truss location.
  • Provide type of roof sheathing?
  • Provide type of roofing or shingles?
  • Minimum 15lb. felt paper is required over roof sheathing.
  • Indicate the rafter size, spacing and span.
  • Provide type and amount of attic ventilation.
  • Habitable rooms shall have a ceiling height of not less than 7’ measured to the lowest projection.
  • Attic access requires a minimum 22” x 30” opening.
  • Ice barrier is required on all roofs and shall be used in lieu of normal underlayment and extend from the lowest edges of all roof surfaces to a point at least 24 inches inside the exterior wall line of the building.

8) Insulation

  • Be in compliance with the 2012 International Energy Conservation Code.  Provide a wall section indicating the insulating method and the “R” values of the insulation. See separate handout for more information.
  • Exposed spray foam or insulated foam board insulation will be protected by an approved thermal barrier or meet the approved flame spread and smoke index values by an approved third party agency.

 9) Exits/Emergency Escape and Rescue Windows

  • Minimum 3’ x 3’ landing at primary exit door is required.  Maximum 7 ¾” drop allowed from top of threshold to top of landing.
  • Minimum 3’ clear width required in finished hallways and stairways.
  • All swinging exterior doors, including the door between the garage and house, shall be 1¾” steel, solid core wood, or 20 minute fire-rated.  Doors shall be equipped with a thumb turn deadbolt lock.  Strike plates secured with minimum 2 ½” screws and view finders at 4 ½’ to 5’ off the floor.
  • Every sleeping room and basement with habitable space shall have at least one openable emergency escape and rescue window or an exterior door opening.  Sill height can’t be more than 44”above floor and windows must have 5.7 square feet of net clear opening.
  • Window wells required for basement egress windows shall have horizontal dimensions that allow the door or window to be fully opened.  The horizontal dimensions of the well shall provide a minimum net clear opening of 9 square feet with a minimum horizontal projection and width of 36”.
  • Window wells with a vertical depth greater than 44” must have a permanently affixed ladder or steps usable with the window in the fully open position.
  • Ladders or rungs shall have an inside width of at least 12”, shall project at least 3” from the wall, and rungs shall be spaced not more than 18” on center for the full height of the window well.  The ladder or steps shall be permitted to encroach a maximum of 6” into the required dimensions of the window well.
  • Window well covers shall be releasable or removable from the inside without the use of a key, tool, or special knowledge or force greater than that which is required for normal operation of the escape and rescue opening.

10) Stairways

  • Minimum 10” tread and maximum 7 ¾” risers on any stairs.  Tread is measured from nosing to nosing.
  • Minimum 6’8” finished headroom in stairways measured from a plane connecting the leading edges of tread nosing.
  • Winder stairs shall have a min. 10” tread at a point not more than 12” from narrow side of tread.  Minimum width at the narrow side shall not be less than 6”.  A handrail shall be mounted on the side of the stair where the tread is narrower.
  • The maximum number of risers off of an exterior door, other than the required egress door, is two before a landing is required.  Three (3) risers are permitted if using handrail per section R311.7.7.

 11) Handrails and Guardrails

  • Any set of steps of four or more risers requires a handrail.
  • When an open side of a stair exceeds 30” above floor or grade, it is required to have an approved guardrail.  Rails need to be 34” – 38” high measured from nosing of tread to top of handrail.  All handrails must be continuous for the full length of the stairs.
  • Maximum spacing for balusters is less than 4”.
  • Handrail grip size must be either circular (1-1/4” to 2”), square (cross section of no more than 2-1/4”), or other shapes (1-1/4” to 2-3/4” with a perimeter of no more than 6-1/4”).
  • Open sides of flat walking surfaces, i.e. decks, balconies, porches, landings, etc. 30” or more above floor or grade shall have approved guardrails.  Guards need to be a minimum 36” high with baluster spacing less than 4”.

12) Glazing

  • Indicate any human impact loads/hazardous locations where safety glazing shall be needed.
  • Indicate any skylights and sloped glazing along with the highest point of projection.          

13) Smoke Detectors and Carbon Monoxide Alarms

  • AC powered smoke detectors are required on all floor levels including basements and inside each individual sleeping room.  Smoke detectors shall be located outside each bedroom within 15’ of bedroom.  All detectors shall be interconnected and have battery backup.  Smoke detectors also have to meet these specifications in any existing house where a building permit is issued.
  • Approved carbon monoxide alarm shall be installed outside of each separate sleeping area within 15 feet of the bedrooms in dwelling units within which fuel-fired appliances are installed and in dwelling units that have attached garages.

14) Radon

  • Indicate on the foundation layout where the radon system will be located and install with a minimum 3-inch diameter ABS, PVC or equivalent gas-tight pipe that is embedded vertically into the sub-slab aggregate or other permeable material before the slab is cast.  Must use a “T” fitting within the sub-slab permeable material fitted with not less than 5 feet of perforated pipe extending from each horizontal opening of the T.  All requirements must meet Appendix F in the 2009 IRC.

15) Other

  • Studs, floor joists, ceiling joists, or rafters will not exceed the boring and notching requirements per the 2009 International Residential Code.
  • All penetrations at every floor/ceiling level, soffits, chases, etc. shall be properly fire blocked per section R302.11/ (ASTM E-814) and must be inspected prior to concealment.
  • Fireblocking shall be provided horizontally at intervals not exceeding 10 feet.
  • Operable windows with sill heights 72”or more above grade and less than 24” above the interior floor surface need to be equipped with guards in accordance with ASTM F 2006 (Egress) or F 2090 (Non-Egress).
  • All pre-manufactured structures must be designed by a licensed architect or engineer.  The requirements shall meet the 90 mph wind speed and 20 psf roof load.
  • Wall coverings, curtain walls, roof coverings, exterior windows, skylights, garage doors and exterior doors must meet the 90 mph wind load.  All vehicular access doors must meet ASTM E330 or ANSI/DASMA 108.


  • Revisions on plan resubmittals should be highlighted or clouded so that the changes are readily found during the plan review process.
  • The items listed above do not comprise an exhaustive list.  The presence of the information listed above (when applicable) will expedite plan review and issuance of permits.  Thank you for your cooperation.  If there are any questions, or if we can be of assistance, please feel free to contact us.


Fire Station #1, 307 S Randolph St.
Click on image for map.