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Idaho Springs City Zoning Code

ARTICLE IV

Development Regulations by Zone District

Sec. 21-60.- Buildings per lot.

Only one (1) primary structure is allowed per lot in R-E, R-1, or R-2 Zone Districts.

(Ord. No. 19, §2(Exh. A), 2019)

Sec. 21-61. - Minimum gross floor area.

No dwelling unit shall have a gross floor area of less square footage than listed as follows:

Table 21-61-1. MINIMUM GROSS FLOOR AREA BY ZONE DISTRICT
District Dwelling Type Minimum Gross Square Footage
R-E Single-family 1,200
R-1 Single-family 850 (a)
R-2, R-3 & R-M Single-family attached and detached 850 (a)
R-3 & R-M Multiple-family Efficiency Unit (studio) 400 (a)
R-3 & R-M Multiple-family 1-bedroom apartment 550 (a)
R-3 & R-M Multiple-family 2-bedroom apartment 720 (a)
R-3 & R-M Multiple-family 3-bedroom apartment 900 (a)
R-3 & R-M Multiple-family over 3-bedroom apartment Add 200 sq. ft. for each bedroom to the 3rd bedroom
R-E & R-1 Accessory Dwelling Unit (ADU) 200 (a)

 

(a) F.H.A. or H.U.D. minimum requirement shall govern for dwelling units constructed under their programs.

(Ord. No. 19, §2(Exh. A), 2019)

Sec. 21-62. - Maximum gross floor area.

Within the R-1 Residential-One Zone District, no new structure shall have a footprint that is greater than fifty percent (50%) of the average footprint of all primary structures within one hundred fifty (150) feet of the subject property.

(Ord. No. 19, §2(Exh. A), 2019)

Sec. 21-63. - Development standards.

District
Minimum Lot Area in Square Feet
Minimum Lot Width in Feet at Front of Setback Line(a)
Minimum Proportion of Lot in Unobstructed Open Space
Setbacks in Feet
See notes (d)(e)(f) 		Max Height
Front
Rear
Side
R-E 14,520 (⅓ acre) 100' 50% 30' 20' 15' 35'
R-1 6,000 (b) 50' (b) 50% 15' 15' 5' 35'
R-2 5,000 (b)(c) 50' (b) 50% 15' 15' 5' 35'
R-3 5,000 (b)(c) 50' (b) 50% 20' 20' 5' 35'
R-M 14,520 (⅓ acre) 100' 50% 30' 20' 15' 45'
HD (—) (—) (—) Buildings shall be no further than 5' from front and side property line. No rear setback is required. 35'
C-1 (—) (—) 10% 10' 10' 5' 35'
C-2 (—) (—) 15% 10' 10' 5' 35'
C-3 (—) (—) 20% 10' 10' 5' 35'
I-1 (—) (—) 20% 10' 10' 5' 35'
L-I (—) (—) 20% 10' 10' 5' 35'
PD * * * * * * *
Park (—) (—) (—) (—) (—) (—) 35'
CONS (—) (—) 100% (—) (—) (—) (—)
East End Overlay District: See Chapter 26

 

Notes:

* See Article V, PD.

(—) This symbol means that no limitations are specified.

(a) The widths given are for lots of rectangular shape; for lots not rectangular, the width shall be ½ the width given but not less than thirty (30) feet. The values given in the table shall then be the average lot width.

(b) The area and width may be reduced for a structure used as a single-family dwelling if:

1. The lot existed prior to adoption of this Code.

2. The lot is adjoined on both sides by lots with structures thereon, or by a street on one (1) side and a lot with a structure thereon on the other side.

Reductions shall be:

1. R-1: 4,400 sq. ft. of area and 37 ft. in width.

2. R-2: 3,900 sq. ft. of area and 35 ft. in width.

3. R-3: 3,900 sq. ft. of area and 35 ft. in width.

(c) Minimum lot size for each single family attached unit is 400 sq. ft.

(d) Front setbacks for all accessory structures shall be 1½ times the distance listed in the table.

(e) Side and rear setbacks for accessory structures and accessory dwelling units shall be five (5) feet.

(f) Permitted encroachments on setback space:

1. Any structure or part thereof which is below the grade of any setback may project any distance into such setback space.

2. The following may project eighteen (18) inches into all setbacks: belt courses, sills, lintels, pilasters, chimneys not over six (6) feet in width, gas and electric meters and transformers.

3. The following may project five (5) feet into all setbacks: building accessories designed and intended to control light entering a building, unwalled porches, terraces and balconies and outside stairways.

4. Cornices, eaves, roof overhangs and gutters may project five (5) feet into the front and rear setbacks and five (5) feet or ½ the side setback space, whichever is less, into the side setback.

(Ord. No. 19, §2(Exh. A), 2019; Ord. No. 11, §3, 2025)

Sec. 21-64. - Use limitations; cul-de-sac lots.

The minimum lot width at the street frontage shall be fifty (50) feet. The average width of the lot shall not be less than the minimum required frontage of standard lots within the zone district in which such lot is located, and the lot shall meet the area requirements of the zone district.

(Ord. No. 19, §2(Exh. A), 2019)