Troy, MI Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Max lot coverage, all R-1 districts
- 30%
- Applies to
- R-1A through R-1E
- What it measures
- building footprint, not all impervious area
- Modification path
- Sustainable Design Project, Section 12.01
- Enforcement
- Municipal Civil Infraction, Chapter 100
Summary
Troy caps buildings in the R-1A through R-1E one-family districts at 30 percent of lot area under Section 4.06.C, the same limit whether the parcel is a 30,000-square-foot R-1A lot or a 7,500-square-foot sewered R-1E lot. Section 4.06.D.5 lets a Sustainable Design Project modify that cap for qualifying measures under Section 12.01.
C. Dimensional Requirements. The following dimensional requirements shall apply to the R-1A through R-1E Districts: Minimum Lot Size Per Dwelling Unit Maximum Height Minimum Yard Setback (Per Lot in Feet) Front Sides Rear Minimum Floor Area Per Unit (Square Feet) Maximum % of Lot Area Covered by Buildings Use District Area in Sq. Ft. Width in Ft. Frontage in Ft. In Stories In Feet Least One Least Two R-1A No Sewer 30,000 150 150 2 1/2 30 40 15 30 45 1,400 30% R-1B No Sewer 21,780 110 110 2 1/2 30 40 15 30 45 1,400 30% R-1C No Sewer 21,780 110 110 2 1/2 30 30 15 30 40 1,200 30% R-1D No Sewer 21,780 110 110 2 1/2 30 25 15 30 40 1,000 30% R-1E No Sewer 21,780 110 110 2 1/2 30 25 15 30 35 1,000 30% D. Supplemental District Standards. 5. Maximum lot coverage may be modified for projects obtaining Sustainable Design Project status for measures specifically related to the proposed modification, as set forth in Section 12.01, Sustainable Design Options.
Full Breakdown
C of Troy's Zoning Ordinance, effective July 23, 2026, lists 'Maximum % of Lot Area Covered by Buildings' as a column in the dimensional-requirements table for every one-family residential district. The figure is 30 percent across R-1A, R-1B, R-1C, R-1D, and R-1E alike, regardless of whether the district's minimum lot size is 30,000 square feet (R-1A) or as small as 7,500 square feet on a sewered R-1E lot. Because the column is titled coverage 'by buildings,' the cap measures building footprint on the lot rather than every impervious surface; the same table separately regulates front, side, and rear setbacks, minimum lot width and frontage, and minimum floor area per dwelling unit, so a house that meets its setbacks can still be limited by the 30 percent coverage ceiling if the footprint is too large for the lot.
01, Sustainable Design Options, may have its maximum lot coverage modified for measures specifically tied to the proposed sustainable design change. C table governs every one-family building permit application in the R-1A through R-1E districts.
Violations & Fines
Section 3.08 treats a building that exceeds the 30 percent lot-coverage cap as a Municipal Civil Infraction under Chapter 100 of Troy's Code of Ordinances. The over-built structure is declared a public nuisance per se and may be abated by court order, and the responsible owner faces fines, costs, damages, and injunctive orders, with each day of continuing violation counted as a separate offense.
Frequently Asked Questions
What percentage of my lot can I cover with a house in Troy?
Does the 30 percent cap include driveways, patios, and decks?
Can I get more than 30 percent lot coverage in Troy?
What happens if a house exceeds the lot-coverage limit?
Sources & Official References
Other rules in Troy
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