What the Orion Township zoning ordinance says about lot size and width, district by district. Section numbers link to the official ordinance.
A lot in Suburban Farms needs at least 2.5 acres (108,900 square feet) of gross area and 165 feet of width (Section 5.04). A new house needs at least 1,200 square feet of floor area (Section 5.04).
Lots of record platted before the ordinance may be built on regardless of size if all other requirements are met, and two adjoining undersized lots under the same ownership are treated as one lot (Section 27.03.A).
A lot in Suburban Estates needs at least 1.5 acres (65,340 square feet) of gross area and 165 feet of width (Section 5.04). A new house needs at least 1,200 square feet of floor area (Section 5.04). Pre-existing platted lots of record may be built on regardless of size if all other requirements are met (Section 27.03.A).
A lot in Suburban Ranch needs at least 30,000 square feet of gross area and 120 feet of width (Section 5.04). A new house needs at least 1,500 square feet of floor area, the highest minimum in the township (Section 5.04). Pre-existing platted lots of record may be built on regardless of size if all other requirements are met (Section 27.03.A).
A lot in R-1 needs at least 14,000 square feet with 100 feet of width (Section 6.04). A new house needs at least 1,320 square feet of floor area (Section 6.04).
Pre-existing platted lots of record may be built on regardless of size if all other requirements are met, and two adjoining undersized lots under the same ownership are treated as one lot (Section 27.03.A).
A lot in R-2 needs at least 10,800 square feet with 80 feet of width where public sewers serve the lot (Section 6.04). Without public sewers the minimum rises to 12,500 square feet, and the ordinance itself warns that Oakland County Health Department regulations requiring 1 acre supersede that figure unless written Health Department approval is received (Section 6.04, footnote, amended 10.20.25). For an unsewered lot, treat the county health standard as the practical control and confirm with the township and county before planning.
A new house needs at least 1,080 square feet of floor area (Section 6.04). Pre-existing platted lots of record may be built on regardless of size if all other requirements are met (Section 27.03.A).
A lot in R-3 needs at least 8,400 square feet with 70 feet of width where public sewers serve the lot (Section 6.04). Without public sewers the minimum rises to 12,500 square feet, and the ordinance warns that Oakland County Health Department regulations requiring 1 acre supersede that figure unless written Health Department approval is received (Section 6.04, footnote, amended 10.20.25).
A new house needs at least 960 square feet of floor area (Section 6.04). Pre-existing platted lots of record may be built on regardless of size if all other requirements are met (Section 27.03.A).
A multiple-family development needs a site of at least 5 acres, excluding existing road right-of-way (Section 7.03.B; Section 7.04.A). Density is capped at 6 dwelling units per acre in RM-1 (Section 7.04.C).
Minimum floor area per unit (Section 7.04.D): one bedroom 500 square feet, two bedrooms 700, three bedrooms 900, four bedrooms 1,000, plus 150 square feet for each bedroom beyond four. Recreation open space of 500 square feet per unit or 25,000 square feet, whichever is greater, is required (Section 7.03.L.3).
A multiple-family development needs a site of at least 5 acres, excluding existing road right-of-way (Section 7.03.B; Section 7.04.A). Density is capped at 8 dwelling units per acre in RM-2 (Section 7.04.C). Unit floor area minimums and the 500 square feet per unit recreation space requirement match RM-1 (Section 7.04.D; Section 7.03.L.3).
A mobile home park needs at least 15 acres, with at least 5,500 square feet of lot area per mobile home (Article XXVI).
Minimum lot area is 20,000 square feet (Section 9.03.B; Section 9.04). A site plan approved by the Planning Commission is required for development (Section 9.03.A; Section 30.01).
Minimum lot area is 9,000 square feet (Section 11.03.B; Section 11.04). A single-tenant building is capped at 20,000 square feet (Section 11.04). Site plan approval by the Planning Commission is required (Section 11.03.A; Section 30.01), and direct access to a public road with at least an 86 foot right-of-way (Section 11.03.G).
Minimum lot area is 12,000 square feet (Section 14.03.B; Section 14.04). Site plan approval by the Planning Commission is required (Section 14.03.A; Section 30.01), and any GB use needs direct access to a dedicated public road with an existing or proposed right-of-way of at least 120 feet (Section 14.03.G).
Minimum lot area is 2 acres, and Article XXVI caps an LI parcel at 30 acres (Section 16.03.B; Article XXVI). Site plan approval by the Planning Commission is required (Section 16.03.A; Section 30.01), with direct access to a public road having at least an 86 foot right-of-way (Section 16.03.F).
An Industrial Park development needs 20 acres for the total park, with individual lots of at least 2 acres (Article XXVI).
An Industrial Complex site needs at least 400 acres, with a maximum of 500 acres (Article XXVI).
A Railroad Freight Yard site needs at least 40 acres (Article XXVI).
A Special Purpose 1 development needs 10 acres for the whole development, with at least 5,000 square feet per structure (Article XXVI).
A Special Purpose 2 site needs at least 10 acres (Article XXVI).
A Recreation 1 site needs at least 20,000 square feet (Article XXVI).
A Recreation 2 site needs at least 2 acres, with a maximum of 175 acres (Article XXVI).
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