§ 21.06.020. Dimensional standards tables.

Latest version.

This section contains tables that list the requirements for lot dimensions, building bulk, density, location, and height for all types of development. All primary and accessory structures are subject to the dimensional standards set forth in the following tables. Superscript numbers refer to notes at the bottom of each table. General rules for measurement and exceptions are set forth in section 21.06.030. Dimensional standards for Girdwood and Chugiak-Eagle River zoning districts are set forth in chapters 21.09 and 21.10, respectively. General rules for measurements and exceptions apply in those areas, even if not specifically referenced, unless specifically exempted by those chapters.

These general standards may be further limited or modified by other applicable sections of this title. In particular, some uses have use-specific standards in chapter 21.05 that impose stricter requirements than set forth in these tables.

Table of Dimensional Standards: Residential Districts

TABLE 21.06-1: TABLE OF DIMENSIONAL STANDARDS - RESIDENTIAL DISTRICTS (Additional standards may apply. See district-specific standards in Chapter 21.04 and use-specific standards in Chapter 21.05.)
Use	Minimum lot dimensions		Max lot coverage (% )	Minimum Setback Requirements (ft)			Max number of principal structures per lot or tract	Maximum height of structures (ft)
Use	Area (sq ft)	Width (ft)	Max lot coverage (% )	Front	Side	Rear	Max number of principal structures per lot or tract	Maximum height of structures (ft)
R-1: Single-Family Residential District
Residential uses	6,000	50	30	20	5	10	1	Principal: 30 Accessory garages/carports: 25 Other accessory: 12
All other uses	6,000	50	30	20	5	10	N/A
R-1A: Single-Family Residential District (larger lot)
Residential uses	8,400	70	30	20	5	10	1	Principal: 30 Accessory garages/carports: 25 Other accessory: 12
All other uses	8,400	70	30	20	5	10	N/A
R-2A: Two-Family Residential District (larger lot)
Dwelling, single-family detached	7,200	60	40	20	5	10	1	Principal: 30, not to exceed two and one-half stories Accessory garages/carports: 25 Other accessory: 12
Dwelling, two-family	8,400	70	40	20	5	10	1
Dwelling, single-family attached	3,500	35 (40 on corner lots)	40	20	N/A on common lot line; otherwise 5	10	1
All other uses	7,200	60	40	20	5	10	N/A
R-2D: Two-Family Residential District
Dwelling, single-family detached	6,000	50	40	20	5	10	1	Principal: 30, not to exceed two and one-half stories Accessory garages/carports: 25 Other accessory: 12
Dwelling, two-family	6,000	50	40	20	5	10	1
Dwelling, single-family attached	3,500	35 (40 on corner lots)	40	20	N/A on common lot line; otherwise 5	10	1
All other uses	6,000	50	40	20	5	10	N/A
R-2M: Mixed Residential District
Dwelling, single-family detached	6,000	50	40	20	5	10	1	Principal: 30, not to exceed two and one-half stories Accessory garages/carports: 25 Other accessory: 12
Dwelling, two-family	6,000	50	40	20	5	10	1
Dwelling, single-family attached	3,000	35 (40 on corner lots)	40	20	N/A on common lot line; otherwise 5	10	1
Dwelling, townhouse	2,400	24 (30 on corner lots)	60	20	N/A on common lot line; otherwise 5	10	1
Dwelling, multifamily (up to 8 units permitted per building)	8,500 + 2,300 for every unit over 3	50	40	20	10	10	More than one principal structure may be allowed on any lot or tract in accordance with subsection 21.07.110 F.2.
Dwelling, multifamily, with single- or two-family style construction of multiple buildings on a lot	3,000 per unit	50	40	20	10	10
All other uses	6,000	50	40	20	5	10
R-3: Mixed Residential District
Dwelling, single-family attached	3,000	35 (40 on corner lots)	40	20	N/A on common lot line; otherwise 5	10	1	35
Dwelling, single-family detached	6,000	50	40	20	5	10	1	35
Dwelling, townhouse	2,000	20 (30 on corner lots)	60	20	N/A on common lot line; otherwise 5	10	1	35
Dwelling, two-family	6,000	50	40	20	5	10	1
Dwelling, multi-family, three or four units	6,000	50	40	10	5, unless the abutting lot has a lower-density residential zoning, in which case 10	10 if abutting an alley; otherwise 20	More than one principal structure may be allowed on any lot or tract in accordance with subsection 21.07.110 G.2.
Dwelling, multifamily, five or six units	8,500
Dwelling, multifamily, seven or more units	9,000 +1,000 for every unit over 7 units
All other uses	6,000	50	40	20	10	20
R-3A: Medium Density, Mixed-Use Residential District
Dwelling, Townhouse	2,000	20 (30 on Corner Lots)	60	20	N/A with common wall - otherwise 5	10	More than 1 Principal Structure may be allowed on any lot per subsection 21.07.110G.2.	35
Dwelling, Mixed-Use	6,000 + 1,000 for every dwelling unit over 6 units	50	50	Min. 10. Max. 40 A minimum of 33% of the front building elevation shall be within the maximum front setback (see subsection 21.06.030C.5.)	5 plus two feet for each 5 feet in height exceeding 35 feet	10, if abutting an alley, otherwise 20		40, not to exceed 3 stories
Dwelling, Multi-family	6,000 + 1,000 for every dwelling unit over 6 units	50	50		5 plus two feet for each 5 feet in height exceeding 35 feet	10, if abutting an alley, otherwise 20
All Other Uses	6,000 + 1,000 for every dwelling unit over 6 units	50	50		5 plus two feet for each 5 feet in height exceeding 35 feet	10, if abutting an alley, otherwise 20
R-4: Multifamily Residential District
Dwelling, single-family, attached	3,000	35 (40 on corner lots)	40	20	N/A on common lot line; otherwise 5	10	1	35
Dwelling, single-family detached	6,000	50	40	20	5	10	1	35
Dwelling, townhouse	2,000	20 (30 on corner lots)	60	10	N/A on common lot line; otherwise 5	10	More than one principal structure may be allowed on any lot or tract in accordance with subsection 21.07.110 G.2.	35
Dwelling, multi-family	6,000	50	60		5 plus one foot for each 5 feet in height exceeding 35 feet	10		45
All other uses	6,000	50	60		5 plus one foot for each 5 feet in height exceeding 35 feet	10		45
R-4A: Multifamily Residential Mixed-Use District
Dwelling, townhouse	2,000	20 (30 on corner lots)	60	Min: 10 Max: 20 A minimum of 50% of the front building elevation shall be within the maximum front setback (see 21.06.030 C.5.)	N/A on common lot line; otherwise 5	15 if adjacent to a residential district (except R-4 or R-4A); otherwise 10	More than one principal structure may be allowed on any lot or tract in accordance with subsection 21.07.110G.2.	35
Dwelling, mixed-use	6,000	50	75		10 if adjacent to a residential district (except for R-4 or R-4A); otherwise 5			70
Dwelling, multi-family	6,000	50	75
All other uses	6,000	50	75					75
R-5: Low-Density Residential District
Dwelling, single-family, or one mobile home	7,000	50	30	20	5	10	1	Principal: 30 Accessory garages/carports: 25 Other accessory: 12
Dwelling, two-family	13,000	100	30	20	5	10	1
All other uses	7,000	50	30	20	5	10	N/A
R-6: Low-Density Residential District (1 acre)
Dwelling, single-family	43,560	150	30	50	25	50	1	Principal: 35 Accessory garages/carports: 30 Other accessory: 25
Dwelling, two-family	87,120	200	30	50	25	50	1
All other uses	43,560	150	30	50	25	50	N/A
R-7: Single-Family Residential District (20K)
Dwelling, single-family	20,000	120	30	25	10	20	1	Principal: 35 Accessory garages/carports: 30 Other accessory: 25
Dwelling, two-family	40,000	120	30	25	10	20	1
All other uses	20,000	120	30	25	10	20	N/A
R-8: Low-Density Residential District (4 acres)
Dwelling, single-family	174,240	300	5	25	15	25	1	Principal: 35 Accessory garages/carports: 30 Other accessory: 25
Dwelling, two-family	261,360	300	5	25	15	25	1
All other uses	174,240	300	5	25	15	25	N/A
R-9: Low-Density Residential District (2 acres)
Dwelling, single-family	87,120	180	5	25	15	25	1	Principal: 35 Accessory garages/carports: 30 Other accessory: 25
Dwelling, two-family	130,680	180	5	25	15	25	1
All other uses	87,120	180	5	25	15	25	N/A
R-10: Low-Density Residential Alpine/Slope District
All uses	(See section 21.04.020O.2.)			10	25 feet; 50 feet if average slope exceeds 30 percent	10	1	Principal: 30 Accessory garages/carports: 25 Other accessory: 18
For other lot dimensional standards, see section 21.08.030K.
For those residential uses where only one principal structure is allowed on a lot, no additional nonresidential principal structures are allowed.
On lots less than 10,000 square feet, lot coverage may be increased to 40 percent when the entire principal structure is less than 16 feet in height, measured in accordance with subsection 21.06.030D.3.
See subsection 21.04.020H.2.d. for information regarding possible height increases.
See subsection 21.06.030C.5. for information regarding possible increases and exceptions to the maximum front setback.
See subsection 21.04.020I.2.e. for information regarding possible height increases.

Table of Dimensional Standards: Commercial and Industrial Districts

TABLE 21.06-2: TABLE OF DIMENSIONAL STANDARDS - COMMERCIAL AND INDUSTRIAL DISTRICTS (Additional Standards May Apply. See district specific standards in chapter 21.04 and use-specific standards in chapter 21.05.)
Use	Minimum lot dimensions			Minimum setback requirement (ft)			Maximum height (ft)
	Area (sq ft )	Width (ft)	Max lot coverage (%)	Front	Side	Rear
B-1A: Local and Neighborhood Business
All uses	6,000	50	50	10	10 if adjacent to a residential district; otherwise 0 or at least 5	15 if abutting a residential district; otherwise 10	30 ,not to exceed two stories
							30, not to exceed two stories
B-1B: Community Business
All uses	6,000	50	50	10	15 if adjacent to a residential district; otherwise 0 or at least 5	15 if abutting a residential district; otherwise 10	40 ,not to exceed three stories
							40, not to exceed three stories
B-3: General Business
Residential household living uses	6,000	50	50	10	5 plus one foot for each 5 feet in height exceeding 35 feet	10	45
All other uses	6,000	50	Unrestricted	10	15 if adjacent to a residential district; otherwise 0 or at least 10	15 if adjacent to a residential district; otherwise 0 or at least 5	45 , except in the Midtown area bounded by the Seward Highway, Tudor Road, Arctic Boulevard, and Fireweed Lane, where there is no maximum height, and except in the U-MED District area bounded by Tudor Road, Elmore Road, Ambassador Drive, and the north and east alignments of Tudor Centre Drive, where the maximum height is 75
DT-1, DT-2, and DT-3: Downtown Districts (RESERVED)
RO: Residential Office District
Allowed residential household living uses	6,000	50	50	10	5 plus one foot for each 5 feet in height exceeding 35 feet	10	45
All other uses	6,000	50	50	10	10 if adjacent to a residential district; otherwise 5	15 if adjacent to a residential district, otherwise 10	45, not to exceed three stories of nonresidential use
MC: Marine Commercial District
All uses	6,000	50	N/A	10	0 or at least 5	0 or at least 5	90 feet above mean sea level
I-1: Light Industrial District
All uses	6,000	50	N/A	10	20 if adjacent to a residential district; otherwise 0 or at least 5		50
I-2: Heavy Industrial District
All uses	6,000	50	N/A	10	40 if adjacent to a residential district; otherwise 0 or at least 5		none
MI: Marine Industrial
All uses	6,000	50	N/A	10	0 or at least 5		Within 50 feet of a residential district, no portion of any structure shall exceed the height limit of that district; otherwise none
For other lot dimensional standards, see section 21.08.030 K.
See subsection 21.06.050 C.5. for information regarding possible increases and exceptions to the maximum front setback.
See subsection 21.04.030 G.4. for information regarding possible height increases for mixed-use development.
See subsection 21.04.020 H.2.d. for information regarding possible height increases.
See subsection 21.04.030 D.2. for information regarding possible height increases.
See subsection 21.04.030 E.2.d. for information regarding possible height increases.
Non-building industrial structures and industrial appurtenances are exempt from the maximum allowed height.

Table of Dimensional Standards: Other Districts

TABLE 21.06-3: TABLE OF DIMENSIONAL STANDARDS - OTHER DISTRICTS (Additional Standards May Apply. See district-specific standards in chapter 21.04 and use-specific standards in chapter 21.05. See section 21.04.070 for AM district standards.)
Uses	Minimum lot dimensions		Max lot coverage (%)	Minimum setback requirements (ft)			Maximum height (ft)
Uses	Area (sq ft)	Width (ft)	Max lot coverage (%)	Front	Side	Rear	Maximum height (ft)
AF: Antenna Farm District
All	87,120	120	50	50	25	25	Unlimited, except that structures shall not interfere with FAA regulations on airport approaches.
DR: Development Reserve District
All	5 acres	100	20	Front, side, and rear setbacks shall be 25 feet when the abutting district is PR, PLI, or residential; otherwise, the setbacks shall be equal to the analogous minimum setback in the abutting district.			35
PR and PLI: Parks and Recreation and Public Lands and Institutions Districts
All	6,000	50	45	Front, side, and rear setbacks shall be 25 feet when the abutting district is DR, PR, PLI or residential; otherwise, the setbacks shall be equal to the analogous minimum setback in the abutting district.			75 feet in the U-MED District, Anchorage Downtown Plan area, and the Midtown area bounded by the Seward Highway, Tudor road, Arctic Boulevard, and Fireweed Lane. 45 feet in other areas. Greater height may be approved by major site plan review or through an institutional master plan.
TA: Turnagain Arm District
Residential (with sewers)	10,400	70	30	20	5	10	35, unless conditional use approval is obtained for greater height
Residential (without sewers) (Bird Creek, Indian Valley, Portage inholdings)	108,150	100	20	25	15	25
Residential (without sewers) (Rainbow Valley inholdings)	216, 300	100	20	25	15	25
Commercial (with sewers)	8,400	50	70	10	10 if adjacent to a residential district, otherwise 5	15 if adjacent to a residential district, otherwise 10
Commercial (without sewers)	50,000	100	25	25	15	25
Industrial (with sewers)	8,400	50	100	10	If abutting to a residential use, the setback shall be equal to that required by the residential use; otherwise none
Industrial (without sewers)	50,000	100	25	25	15	25
Institutional (with sewers)	8,400	50	30	25	10	15
Institutional (without sewers)	50,000	100	25	25	15	25
W: Watershed District
All	N/A	N/A	5	N/A	N/A	N/A	50
For other lot dimensional standards, see section 21.08.030K.

(AO 2012-124(S), 2-26-13; AO 2013-117, 12-3-13; AO No. 2015-100, § 2(Exh. A), 10-13-15 ; AO No. 2016-71, § 1, 6-21-16 ; AO No. 2017-160 , § 3, 12-19-17; AO No. 2017-176 , § 6, 1-9-18; AO No. 2018-43(S) , § 3(Exh. B), 6-12-18)

                    
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