Straight answers
Are tiny homes legal in Michigan, and where can you put one?
Yes on a foundation, wherever the city, village, township or county allows a house or a backyard unit that small. Michigan has a single construction code for the whole state, and a local government cannot write its own. The residential code in force is the 2015 edition: the state's Bureau of Construction Codes says a court order of 7 July 2025 keeps the 2015 standards valid and in effect while a lawsuit over the 2021 replacement continues. The 2015 rule lists the appendices Michigan adopted, and the tiny house appendix is not among them, so a small house is designed to the body of the code. Where a home may stand is a zoning question, and zoning is local. We found no Michigan law that makes a local government allow a backyard home: a 2026 bill that would do so was introduced in the House and is still in committee. A tiny home on wheels is a trailer under the vehicle code, and the zoning act lets local governments regulate recreational vehicles by name.
Figures verified against the sources below · October 6, 2026
01 — The longer answer
What Michigan decides, and what your city or township decides
One building code statewide, held at the 2015 edition
Michigan's construction code act makes the director of the state licensing department responsible for administering and enforcing the code, and lets a city, township or county take over enforcement inside its own boundary by ordinance. It does not let them change the code: construction regulations adopted by a local government are considered repealed and invalid six months after the state code was promulgated. So the building rules for a small house are the same in Detroit and in the Upper Peninsula. The edition is the part that surprises people. The Bureau of Construction Codes filed rules adopting the 2021 residential code, to take effect on 29 August 2025. Its own notice, still posted on the bureau's home page when we read it, says an order of 7 July 2025 in two Court of Claims cases temporarily prevents the department from applying or implementing those rules, and that while the order remains in place the 2015 versions remain valid and in effect. That can change on a court date, so confirm the edition with your enforcing agency before design starts.
Michigan has not adopted the tiny house appendix
Rule R 408.30500 adopts the International Residential Code, 2015 edition, including appendices A, B, C, D, E, F, G, J, K, N, O, P, R and S. The model code's tiny house appendix, written for houses of 400 square feet or less, is not on that list. The relaxations people expect from it, such as lower loft ceilings and ladders to a sleeping loft, are therefore not available as of right in Michigan. A small house is reviewed against the same chapters as any other one-family dwelling, and anything that departs from them is a conversation with the building official. We did not check whether the paused 2021 rules would add the appendix, because they are not in force.
Is there a minimum size for a house in Michigan?
Where there is one, it usually comes from zoning. The Michigan Zoning Enabling Act lets a local unit of government adopt regulations designating or limiting the location, height, bulk, number of stories, uses and size of dwellings, buildings and structures. A minimum floor area in a township ordinance is an exercise of that power, and it varies from one township to the next. The state building code governs how the rooms are built. It does not decide whether your township accepts a house of 300 square feet on its own lot.
Zoning is local, and no state law makes a city allow a backyard home
Under the Zoning Enabling Act a county, township, city or village may regulate land development and set up districts by ordinance. We found no Michigan statute that requires any of them to allow an accessory dwelling unit. House Bill 5585, introduced on 24 February 2026 and referred to the Committee on Government Operations, would change that. As introduced, it makes an accessory dwelling unit a permitted use, decided by administrative staff without a public hearing, where the unit is no larger than 800 square feet or 75 percent of the gross square footage of the main dwelling, whichever is less, sits at least 5 feet from the rear and side property lines, and is in a district where residential use is permitted. The bill counts a unit constructed off site. The same bill would bar a zoning ordinance from excluding mobile homes from any residential zone. The legislature's record showed no committee vote when we read it, so it is a bill and not law.
A factory-built tiny home and the certificate of acceptability
Michigan's route for a factory-built house is the premanufactured unit. The construction code act has the department issue a certificate of acceptability at the place of manufacture, after the manufacturer submits plans and specifications for approval as in compliance with the code and each unit is inspected by the department or a qualified person it approves. The act then limits what happens locally. If a permit application calls for a unit with a certificate and the rest of the application complies with construction regulations, zoning laws and local ordinances, the enforcing agency shall issue the building permit. At installation the unit is subject only to nondestructive tests to determine that it was not damaged in transit or installation and was installed in accordance with the permit. An enforcing agency may still object in writing within 10 business days that a unit does not comply with the code, which sends the question to a hearing. Zoning is untouched by any of this. Ask any manufacturer, ours included, whether the model you are buying will carry the certificate.
A tiny house on wheels is a trailer
The Michigan Vehicle Code makes every trailer moved on a street or highway subject to registration and certificate of title, and exempts from the title requirement only a trailer that weighs less than 2,500 pounds, which a tiny home does not. The code defines a trailer coach as a vehicle primarily designed and used as temporary living quarters for recreational, camping or travel purposes and drawn by another vehicle. The zoning act names recreational vehicles among the things a local government may regulate. Put together, the state treats a home on wheels as a vehicle, and whether you may live in one on a lot is decided by the local ordinance. One more classification is worth settling before you buy: the mobile home law defines a mobile home as a structure transportable in one or more sections, built on a chassis and designed to be used as a dwelling, and that definition carries no minimum size.
Ann Arbor and Grand Rapids
Two cities show what local rules look like. Ann Arbor's guidebook says accessory dwelling units are permissible in any R1, R2, R3 or R4 district, on a lot with a single-family dwelling, one per dwelling. The maximum size is 600 square feet on lots up to 7,199 square feet and 800 square feet on larger lots, or the size of the main dwelling's ground floor if that is less. A detached unit must be at least 3 feet from any lot line and needs fire-rated walls between 3 and 5 feet, and the City's page says no site plan, public hearing or public notice is required. The guidebook is dated September 2023. Grand Rapids caps an accessory dwelling unit at 850 square feet and not more than 40 percent of the gross floor area of the main house. A unit in a separate structure may not sit forward of the house and must be at least 6 feet from it and 3 feet from the side and rear lot lines. The City requires a recorded deed restriction against conveying the unit separately, and a new detached unit needs a dedicated water connection. Its guidance is dated April 2025. Neither city is a guide to the township next door.
Can you live in a tiny home full time in Michigan?
In one built as a house, yes, where the zoning allows that house. A site-built home or a premanufactured unit on a permanent foundation is a dwelling under the state code. A mobile home is a separate route: when one is affixed to land its owner owns and the affidavit of affixture is filed, the state cancels the certificate of title and the home is considered part of the real property. A home that stays on its wheels is the hard case, because the vehicle code describes a trailer coach as temporary living quarters and the decision on the lot belongs to the local ordinance.
Lists of which Michigan counties or townships allow tiny homes circulate widely. The state sources we read give the land use decision to each local government and publish no such list, so the rule for your land is in your own zoning ordinance. The Michigan guide carries the code in force and the design conditions, including the frost line and the snow load table, with the source for each figure.
03 — Sources
Each figure above links to the authority it came from.
Michigan Bureau of Construction Codes notice: on July 7, 2025, an order in two Michigan Court of Claims cases (Home Builders Assoc et al. v LARA et al.) temporarily prevents LARA from taking additional steps necessary to apply or implement the rule sets adopting, in part, the 2021 IRC and 2021 IECC residential standards, which were set to become effective on August 29, 2025; while the stipulated order remains in place, the 2015 versions remain valid and in effect
michigan.govMichigan Bureau of Construction Codes home page: the notice above is the document linked under Part 5, Residential Code and 2021 Michigan Residential Code Notification (as read 6 October 2026)
michigan.govMichigan Administrative Code, Construction Code Part 5, Residential Code, R 408.30500: the provisions of the international residential code, 2015 edition, including appendices A, B, C, D, E, F, G, J, K, N, O, P, R, and S, with listed exceptions
ars.apps.lara.state.mi.usMCL 125.1508b: the director is responsible for administration and enforcement of the act and the code; a governmental subdivision may by ordinance assume responsibility for administration and enforcement within its political boundary
legislature.mi.govMCL 125.1524: six months after the promulgation of the code and thereafter, construction regulations adopted by a governmental subdivision shall be considered repealed and invalid, except as provided in section 8
legislature.mi.govMCL 125.1519, premanufactured units: certificate of acceptability issued by the department at the place of manufacture; plans and specifications submitted for approval as in compliance with the code; each unit inspected by the department or a qualified person approved by it; the enforcing agency shall issue the building permit if the rest of the application complies with applicable construction regulations, zoning laws and local ordinances; at installation the unit is subject only to nondestructive tests; an enforcing agency may object in writing within 10 business days
legislature.mi.govMCL 125.3201, Michigan Zoning Enabling Act: a local unit of government may provide by zoning ordinance for the regulation of land development and the establishment of districts; it may adopt regulations designating or limiting the location, height, bulk, number of stories, uses, and size of dwellings, buildings, and structures that may be erected or altered, including tents and recreational vehicles
legislature.mi.govMichigan Legislature, House Bill 5585 of 2026: introduced 24 February 2026 and referred to the Committee on Government Operations; history as read shows no committee report or floor vote
legislature.mi.govHouse Bill 5585 as introduced: defines an accessory dwelling unit as a secondary dwelling unit, whether constructed on-site or off-site; new section 516 makes an ADU a permitted use, approved on a nondiscretionary basis by administrative staff without a public hearing, if it is not greater than 800 square feet or 75% of the gross square footage of the main dwelling, whichever is less, is set back at least 5 feet from the rear and side property lines, and is in a district in which residential use is a permitted use; new section 207a bars a zoning ordinance from excluding a mobile home from any residential zone
legislature.mi.govMCL 257.216: every motor vehicle, recreational vehicle, trailer, semitrailer and pole trailer moved on a street or highway is subject to the registration and certificate of title provisions, except that a certificate of title is not required for a trailer that weighs less than 2,500 pounds
legislature.mi.govMCL 257.74: trailer coach means every vehicle primarily designed and used as temporary living quarters for recreational, camping, or travel purposes and drawn by another vehicle
legislature.mi.govMCL 125.2302, Mobile Home Commission Act: mobile home means a structure that is transportable in 1 or more sections, built on a chassis, and designed to be used as a dwelling, with or without a permanent foundation, when connected to the required utilities
legislature.mi.govMCL 125.2330i: when a mobile home is affixed to real property in which its owner has the ownership interest and the affidavit of affixture and certificate of title are delivered, the department cancels the certificate of title and the mobile home is considered to be part of the real property
legislature.mi.govCity of Ann Arbor, Accessory Dwelling Unit Guidebook (September 2023): ADUs are permissible in any R1, R2, R3 or R4 zoning district on a lot with a single-family dwelling, one per single-family detached dwelling; maximum 600 sq ft on lots up to 7,199 sq ft and 800 sq ft on lots of 7,200 sq ft or greater, or the size of the ground floor of the main dwelling, whichever is less; a detached ADU must be at least 3 feet from any lot line, with fire-rated walls between 3 and 5 feet
media-001-us.cdn.govstack.comCity of Ann Arbor, Accessory Dwelling Units: no neighborhood notification requirements exist; no site plan, public hearing, or public notice are required, and building permits are necessary for construction
a2gov.orgCity of Grand Rapids, Residential FAQs, Accessory Dwelling Units (April 2025): the floor area of an ADU must be no larger than 850 square feet and not more than 40 percent of the gross floor area of the main house; an ADU in a separate structure may not be located forward of the house, must be at least 6 feet from the house and at least 3 feet from the side and rear lot lines; a deed restriction stipulating that the ADU will not be conveyed separately shall be recorded; a detached ADU requires a dedicated water connection
grandrapidsmi.gov
04 — Related questions
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