Tables 17-07-01 through 17-07-03 of this chapter promulgate the lot and dimensional standards for all districts except the DD District. For DD District standards see Chapter 17.09 of this ordinance. Transition yard standards may also apply—see § 17.07.030 below. Minimum lot sizes and dimensional standards for Park District or Village-owned recreational land uses shall not apply.

(UDO 2008, § 17.07.010)

A.

Applicability. The regulations contained in this section shall apply to the R-4A zoning district and all construction, remodeling, additions, enlargements, or alterations within that district for which a building permit application is accepted as complete by the Village after the effective date of this ordinance. The provisions of this section do not apply to interior remodeling or alterations.

B.

Purpose. These specific regulations for the R-4A district are promulgated in order to:

1.

Protect the unique aspects of each neighborhood and street within the district; and

2.

Maintain a diversity of lot sizes and house sizes; and

3.

Encourage the maintenance and rehabilitation of existing houses; and

Note 1: Minimum lot size is 5,000 sq. ft. and minimum lot width is 45 feet. However, the provisions of § 17.07.020.C of this ordinance concerning lot subdivision shall apply.

Note 2: Setback shall be 25 ft, unless subject lot is part of a block face where at least 50% of the lots are improved with principal buildings having a front yard depth of less than 25 ft, the minimum setback shall be the average of principal buildings on adjacent lots. The burden of proof for determining the 50% requirement and providing information for the average shall be on the applicant.

Note 3: Minimum side yard depth in the R-4 zoning district shall be based on the width of the lot as follows:

If the lot width is 80 feet or greater, the minimum depth of each side yard shall be 15 feet;

If the lot width is less than 80 feet but greater than 55 feet, the minimum depth of each side yard shall be 16.5% of the lot width;

If the lot width is 55 feet or less, the minimum depth of each side yard shall be 12% of lot width or five feet, whichever is greater.

Note 4: Each side yard shall be at least 12% of lot width or five feet, whichever is greater.

4.

Discourage the demolition of existing residences and their replacement with structures that are out of scale with the surrounding neighborhood;

5.

Ensure adequate green space and limit storm water runoff.

C.

Lot Subdivisions in the R-4A District. A lot within the R-4A district may only be subdivided if:

1.

The lot subdivision results in a maximum of two lots, i.e. one additional lot; and

2.

Both of the lots resulting from the subdivision have a front lot line of at least 50 feet; and

3.

Both of the lots resulting from the subdivision have a lot area of at least 6,250 square feet; and

4.

The lot to be subdivided is located along a block face where the mode of all front lot lines abutting the block face is 51 feet or less.

D.

Lot Consolidations in the R-4A District. Lot consolidations shall not result in a lot that has a lot area exceeding 12,500 square feet.

E.

Maximum Floor Area Allowance. Each primary structure within the R-4A shall conform to a maximum floor area allowance. The maximum floor area allowance is determined as follows:

Lot area square footage × 0.16 + 1,600 = Maximum floor area

See the definition of "floor area" in Chapter 17.02 of this ordinance for additional guidance on computing the maximum floor area allowance.

F.

Garages and Other Accessory Structures in the R-4A District. If the provisions of this paragraph F conflict with other paragraphs of this ordinance, this paragraph shall govern. The following provisions apply:

1.

For attached garages, the total width of all garage doors shall not exceed 22 feet or 58% of the dwelling's street-side elevation, whichever is less.

2.

If an existing alley provides access to the lot in question, then detached and attached garages shall be accessed from the alley.

3.

Detached garage height shall not exceed a midpoint height of 15 feet and shall not exceed a peak height of 20 feet.

4.

Accessory buildings including detached garages shall not have a combined total area that exceeds 10% of the lot area.

5.

Detached garages shall be at least seven feet from the principal structure.

6.

Detached garages shall be at least three feet from the rear property line and at least three feet from all side property lines.

7.

The area of attached garages shall not exceed 10% of the lot area.

8.

Driveway width shall not exceed 22 feet.

G.

Front Porches in the R-4A District. An attached front porch with a roof may encroach into the front yard setback up to 6 feet but no closer than 5 feet to the front property line. Floor area above porch may not be enclosed and must be on first floor only.

(UDO 2008, § 17.07.020; Ord. No. O-65-11, § 8, 10-24-2011; Ord. No. O-10-14, § 3, 2-10-2014; Ord. No. O-12-16, § 3, 6-13-2016; Ord. No. O-33-18, § 5, 8-13-2018; Ord. No. O-09-21, § 4, 3-22-2021; Ord. No. O-55-22, § 3, 11-14-2022)

Where a B-, INT-, or M-zoned lot abuts a residentially zoned lot, a transition yard shall be maintained. Transition yards are intended to ensure an adequate buffer between commercial and residential land uses, and are required in addition to the minimum setback requirements of Table 17-07-02. Transition yards shall meet the following requirements:

A.

Depth. Transition yards shall have a minimum depth of 12 feet.

B.

Screening. Screening shall be provided in accordance with the landscape standards of § 17.20.060. In instances where a drainage or utility easement is conterminous with the transition yard and make the required screening requirements difficult to fulfill, the width of the transition yard shall be increased so it does not compromise the function of the utility or drainage easement.

C.

Use. The transition yard shall not be used for parking, loading, servicing, or storage.

D.

Exceptions. In cases where a lot adjacent to a lot B-, INT- or M-zoned lot is re-zoned to residential or annexed to the Village, such B-, INT- or M-zoned lots are exempt from the requirements of this paragraph until such time that a site development permit is required for changes to such B-, INT-, or M-zoned lots.

(UDO 2008, § 17.07.030)

A.

Applicability. The provisions of this section shall apply to all residential land uses in all R zoning districts except for the R-4A zoning. See § 17.07.020 of this ordinance for provisions governing driveways in the R-4A zoning district.

B.

Driveway Width. Driveway width shall not exceed 22 feet at the lot line. From the lot line, driveway width may gradually be increased to accommodate entry into garages. Where the driveway meets the garage door(s), the width of the driveway may extend no more than 2 ft from the outside edge of the garage door(s) (the 2 ft limit does not apply between garage doors). In no case shall driveway width exceed 32 feet.

C.

Existing Driveways. Driveways existing at the time of approval of the adoption of this section that exceed the standards of paragraph B above shall be allowed to be repaired or replaced, so long as the width of the driveway is not increased. Service walks adjacent to driveways existing at the time of approval of the adoption of this section shall not be included in the calculation of the existing driveway width.

D.

Driveway Setbacks. Driveways shall be located at least 1 foot from any side lot line.

(Ord. No. O-38-12, § 1 (Exh. A), 5-14-2012; Ord. No. O-29-15, § 6, 9-14-2015)

A.

Applicability. The regulations contained in this section shall apply to the R-5A zoning district and all construction, remodeling, additions, enlargements, or alterations within that district for which a building permit application is accepted as complete by the Village after the effective date of this ordinance. The provisions of this section do not apply to interior remodeling or alteration.

B.

Purpose. These specific regulations for the R-5A district are promulgated in order to:

1.

Maintain proper scale and bulk in residential neighborhoods within the Village; and

2.

Encourage the Village's commitment to open space within residential neighborhoods; and

3.

Ensure adequate green space and limit storm water runoff; and

4.

To achieve the goal of the Lemont 2030 Comprehensive Plan to allow detached single-family development on smaller lots.

C.

Garages. If the provisions of this paragraph C conflict with other paragraphs of this ordinance, this paragraph shall govern. The following provisions apply:

1.

Attached three (3) car garages facing a public street:

i.

The bay for the third vehicle is setback a minimum of 24 inches from the primary garage;

ii.

The three (3) vehicle garage width constitutes less than 58% of the total building width;

2.

Garages for three (3) vehicles facing a public street on the side yard of a corner lot must have the third bay offset a minimum of 24 inches from primary garage.

(Ord. No. O-33-18, § 6, 8-13-2018; Ord. No. O-09-21, § 4, 3-22-2021)