| Zone Type |
Symbol |
Minimum Lot Size |
ULDC |
| Single Family |
R-8.4 |
Minimum 8,400 SF lots. |
19.02 |
| Single Family |
R-9.6 |
Minimum 9,600 SF lots. |
19.02 |
| Single Family |
R-12 |
Minimum 12,000 SF lots. |
19.02 |
| Single Family |
R-15 |
Minimum 15,000 SF lots. |
19.02 |
| Multi-Family, Limited |
MF-2L |
The maximum allowed density is 26 units per acre. |
19.03 |
| Multi-Family |
MF-2 |
The maximum allowed density is 38 units per acre. |
19.03 |
| Multi-Family |
MF-3 |
The maximum allowed density is 26 units per acre. |
19.03 |
| Business |
B |
No minimum lot size. |
19.04.050 |
| Planned Business |
PBZ |
No minimum lot size for non-residential uses; the average parcel size of residential lots shall be 7,200 SF. |
19.04.010 |
| Commercial Offices |
C-O |
No minimum lot size. |
19.04.020 |
| Public Institution |
P |
No minimum lot size. |
19.05 |
| Town Center |
TC |
No minimum lot size. |
19.11 |
The single-family residential zoning districts allow specified uses and lot development. The minimum lot development standards for the single-family residential zoning districts are summarized in the following table:
| Zoning Districts |
Minimum Lot Size1 |
Minimum Lot Width |
Minimum Lot Depth |
| R-8.4 |
8,400 SF |
60 feet |
80 feet |
| R-9.6 |
9,600 SF |
75 feet |
80 feet |
| R-12 |
12,000 SF |
75 feet |
80 feet |
| R-15 |
15,000 SF |
90 feet |
80 feet |
(1 The shorelands part of any lot and any area of the lot that is part of a vehicular access easement shall be excluded in determining whether a lot complies with the lot's minimum area requirements.)
The following standards apply to all single family zoned property R-8.4, R-9.6, R-12, and R-15:
| Minimum Front Yard Setbacks |
Minimum Rear Yard Setbacks |
Minimum Side Yard Setbacks |
Minimum Setback From Public Rights-of-ways and vehicular access easements |
Maximum Building Height2 |
Maximum Gross Floor Area3 |
| 20 feet |
25 feet |
Lots with a width of 90 feet or less, the side yard setback must sum to 15 feet; provided that no side yard shall be less than 5 feet. Lots with a width of more than 90 feet, the side yard setbacks must sum to 17% of the lot width; provided that no side yard shall be less than 33% of the required side yard width. |
10 feet |
30 feet |
40% of net lot area. |
(2 See MICC 19.02.020(E) for how height is calculated.)
(3 See MICC 19.02.020(D) for how Gross Floor Area is calculated.)
The total amount of impervious surface permitted on a residential lot is governed by the lot slope.
| Lot Slope1 |
Hardscape |
Lot Coverage
(Buildings & driving surfaces) |
| Less than 15% |
9% |
40%
|
| 15 – less than 30% |
9% |
35%
|
| 30-50% |
9% |
30%
|
| Greater than 50% slope |
9% |
20%
|
(1Lot Slope is calculated by subtracting the lowest elevation on a lot from the highest elevation, and dividing the resulting number by the shortest horizontal distance between these two elevation points.)
This information is summarized in Title 19 of the Mercer Island City Code, "Unified Land Development Code and is provided for quick reference only. Review Title 19 to determine exact requirements, and to find other development regulations affecting a parcel or lot.
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