HomeMy WebLinkAbout#4- Accessory Structure review
Memo
To: Planning Commission Members
From: Kari Barker, Associate Planner
Date: November 23, 2009
SubjectAccessory Structure Review
:
REQUEST
The Planning Commission is to review and discuss the Accessory Structure Ordinance.
HISTORY
The Planning Commission reviewed and discussed the Accessory Structure Ordinance at its
November 9, 2009, meeting. The review of the Ordinance was at the request of the Planning
Commission, resulting from an OHDS review for a garage at the September 28, 2009, Planning
Commission meeting.
The three main points of the discussion were: 1) Changes to proportion of impervious surface
calculated, 2) Tree replacement, and 3) Attached and detached garage differentiations.
ADDITIONAL INFORMATION
Comparison of Impervious Surfaces
The following homes received a building permit in 2009 for a detached garage. The table
indicates the square footage allowed with the current 35% impervious surface limits and 25%
impervious surface limits.
Address Size of Accessory Structure 35% Impervious 25% Impervious
396 square feet
316 4th Street W (590 sq. ft. existing structure) 1208.9 square feet 863.5 square feet
1912 Manor Lane 988 square feet 2066.4 square feet 1476 square feet
1607 Pine St 480 square feet 1969.8 square feet 1407 square feet
1822 Ashland 624 square feet 1716.4 square feet 1226 square feet
462 square feet
1906 Eddy St (528 sq. ft. existing structure) 1760 square feet 1257.75 square feet
Tree Preservation Guidelines
The City of Hastings’ Tree Preservation Guidelines outline the replacement of trees for new
development, new building construction, and where application for a grading permit is being
made within the City of Hastings. The Tree Replacement Schedule is as follows:
Tree Replacement Schedule
Size of Tree Damaged or DestroyedNumber of Replacement Trees
Category ACategory BCategory C
Coniferous 12-24 feet high124
Coniferous 24 feet or higher248
Hardwood Deciduous 8-20" Diameter124
Hardwood Deciduous greater than 20" Diameter248
Softwood Deciduous 12-24" Diameter124
Softwood Deciduous greater than 24" Diameter248
Size of Replacement Trees
than 3" in than 2.5" in than 1.5" in
diameterdiameterdiameter
Deciduous Trees
Not less Not less Not less
than 10' in than 8' in than 5' in
heightheightheight
Coniferous Trees
Source of Replacement Trees
Replacement trees shall consist of "certified nursery stock" or state inspected transplant
stock as defined by Minnesota Statutes 18.46.
Species Requirement
Where ten or more replacement trees are required, not more than fifty (50) percent of
the replacement trees shall be of the same species without the approval of the City.
Attached and detached garage differentiations
There currently is not a size difference for homes with or without an attached garage, though
there is a numerical difference. Homes with an attached garage are allowed one accessory
structure up to 1,000 square feet and one structure 120 square feet or less. Homes with a
detached garage are allowed two accessory structures up to 1,000 square feet. At the November
9, 2009, removing the provision allowing the secondary 120 square foot structure for homes with
an attached garage was discussed.
Size of Shed in Comparison to Lot Size
50 X 20 garage on a .17 acre lot (7405.2 square feet)
This lot would be allowed roughly 1,000 square feet for an accessory structure under the 35%
impervious surface guidelines and 713.75 square feet under 25% impervious surface.
50 X 20 garage on a .24 acre lot (10454.4 square feet)
This lot would be allowed 1,000 square feet for an accessory structure under either the 25% or
35% impervious surface guidelines.
50 X 20 garage on a .34 acre lot (square feet)
14810.4
This lot would be allowed 1,000 square feet for an accessory structure under either the 25% or
35% impervious surface guidelines.