Straight answers
Are tiny homes legal in South Carolina, and where can you put one?
Yes on a foundation, wherever the city or county zoning allows a house or a backyard unit that small. South Carolina is unusual in two ways. Every municipality and county must enforce the building codes adopted by the South Carolina Building Codes Council, and only those codes. And the council has adopted the residential code's tiny house appendix for use statewide, so the rules written for houses of 400 square feet or less apply in every jurisdiction that enforces the code. Today that is Appendix AQ of the 2021 edition. From 1 January 2027 it is Appendix BB of the 2024 edition. Where a home may stand is a separate question, and it belongs to local zoning. The state planning act mentions accessory dwellings once, as something a local government may promote, so a backyard home is allowed or not by local ordinance. A tiny home on wheels is a house trailer in the vehicle code, and the two counties whose guidance we read treat one as a recreational vehicle.
Figures verified against the sources below · October 7, 2026
01 — The longer answer
What South Carolina decides, and what your city or county decides
One statewide code, with the 2024 edition arriving 1 January 2027
State law says all municipalities and counties shall enforce building codes, and shall enforce only the national building and safety codes the statute provides for. The Building Codes Council adopts the latest editions of the International Code Council's building and residential codes, with South Carolina modifications. The council's own summary puts it plainly: modifications it has not approved are invalid and cannot be adopted or enforced by municipalities and counties. The 2021 editions have been in force since 1 January 2023. On 26 August 2025 the council adopted the 2024 editions, including the 2024 International Residential Code, and set 1 January 2027 as the implementation date for local jurisdictions. We found no statewide rule on the council's pages for applications already in review on that date, so if your permit is filed close to it, ask the building official which edition your plans are reviewed under.
The tiny house appendix applies statewide
In most states an appendix to the residential code applies only where a city or county adopts it. South Carolina works the other way round. The council states that appendices may not be used by municipalities and counties unless the council itself has adopted them, and it has adopted the tiny house appendix for the whole state in three code cycles running: Appendix Q of the 2018 edition, Appendix AQ of the 2021 edition, and Appendix BB of the 2024 edition. The 2024 entry reads "Appendix BB is adopted for use statewide", and gives as its reason that jurisdictions will have more options and flexibility to approve small home construction. The appendix covers houses of 400 square feet or less and relaxes the body of the code on points such as loft ceiling height and access to a sleeping loft. It is a construction standard. It does not decide whether your zoning district accepts a house that small.
Is there a minimum size for a house in South Carolina?
Where there is one, it usually comes from zoning. The planning act lets a municipality or county that has adopted a zoning ordinance regulate, district by district, the use of buildings and land and the size, location, height, bulk and number of stories of buildings. A minimum floor area in a zoning ordinance is an exercise of that power, and it differs from one place to the next. The building code governs how the rooms are built. One point that matters on a small budget: under the council's modification to the 2024 code, carried forward from earlier cycles, an automatic fire sprinkler system is not required in one- and two-family dwellings.
Zoning is local, and the state does not make a city allow a backyard home
A governing body may adopt a zoning ordinance once it has adopted at least the land use element of its comprehensive plan, and the ordinance creates the districts and their rules. We searched the planning chapter of the state code for accessory dwellings and found one mention. It sits in a definition of market-based incentives, which lists design flexibility that promotes infill development, mixed use and accessory dwellings among the tools a local government may use for affordable housing. That is permission to encourage them, and nothing in the chapter requires a city or county to allow one. Whether a second home may stand behind a house is written in the local ordinance.
A factory-built tiny home in South Carolina
The state has a program for this. A modular building unit is a building of closed construction, other than a manufactured home, built off-site to the applicable codes and transported to where it will be used. Modular buildings must be certified by the Building Codes Council, and the evidence is a label the manufacturer attaches under the supervision of an approved inspection agency. The council's program requires modular manufacturers to be licensed and to use an independent inspection agency. A labeled unit must be accepted by every local government as equivalent to a site-built structure, while zoning, setbacks, site development and on-site installation stay with the local authority, which must apply them without any distinction between modular and site-built. One part of the statute matters for small homes in particular. A single-family modular home must meet placement standards: a roof pitch of at least 5 in 12 where the home has a single predominant roofline, eaves of at least ten inches unless the pitch is at least 7 in 12, a first-story exterior wall at least seven feet six inches high, and a permanent perimeter foundation wall. Many tiny home designs have a lower roof than that, and the statute provides an appeal to the council for a variance. Ask any manufacturer, ours included, whether the home will carry the South Carolina modular label and how its design meets those standards.
A tiny house on wheels is a house trailer
The vehicle code defines a house trailer as a trailer or semitrailer designed, constructed and equipped as a dwelling place, living abode or sleeping place, either permanently or temporarily, and equipped for use as a conveyance on streets and highways. The Department of Motor Vehicles registers those, and it places in a separate camper or travel trailer class every trailer not more than 35 feet long and 8 feet wide that is equipped or used for private living quarters. A unit that exceeds the size limits for a house trailer and is built principally as a permanent dwelling is a mobile home in the same code. None of those definitions decides where a unit may be parked and lived in. The term park model does not appear in the registration and titling chapters we read.
Charleston, Dorchester County and Greenville County
Charleston has permitted accessory dwelling units as a conditional use in all base zoning districts since an ordinance approved on 8 September 2020. The City allows one per lot, with no more than two dwelling units on the lot in total. The conditioned floor area cannot exceed 850 square feet, one parking space is required on the lot in addition to the house's own, and occupancy is limited to two adults and any number of children. The owner records a declaration of covenants under which either the house or the unit must be owner-occupied, and a lot with an accessory dwelling unit is not eligible for a short-term rental permit. Dorchester County states that a tiny home built to the applicable building codes, on-site or off-site, and placed on a permanent foundation is a single-family detached residence, permitted wherever single-family detached homes are allowed. Greenville County's permitting guideline for tiny houses of 400 square feet or less, dated October 2017 and written against an earlier code edition, lists two routes for a permanent home built off-site: a South Carolina modular label for single-family dwelling occupancy, or open construction set on a permitted foundation and inspected like a site-built house. None of the three is a guide to the town next door.
Can you live in a tiny home full time in South Carolina?
In one built as a house, yes, where the zoning allows that house. A home on a permanent foundation built to the adopted code, or carrying the state modular label, is a dwelling. A manufactured home is another route: when the owner installs one to the state standards, removes the wheels, axles and hitch, and files the affidavit to retire its title, it is treated as real property. A home that stays on its wheels is the hard case. Dorchester County says recreational vehicles cannot be used as dwelling units, that it will not issue utility permits or addresses for them, and that tiny homes on wheels are considered recreational vehicles. Greenville County's 2017 guideline calls a unit built to the park model standard seasonal use only, allowed in approved RV parks or on an approved unzoned parcel.
Lists of which South Carolina counties allow tiny homes circulate widely. The state sources we read publish no such list and leave land use to each city and county, so the rule for your land is in your own zoning ordinance. The South Carolina guide carries the code in force and what we say about coastal wind and flood exposure, with the source for each statement.
03 — Sources
Each figure above links to the authority it came from.
S.C. Code 6-9-10(A): all municipalities and counties in this State shall enforce building, energy, electrical, plumbing, mechanical, gas, and fire codes, and shall enforce only the national building and safety codes provided in this chapter. 6-9-50(A): the council shall adopt by reference and amend only the latest editions of the building and residential codes published by the International Code Council; the appendices may be adopted as needed, but the specific appendix must be referenced by name or letter designation at the time of adoption. 6-9-40: the council determines whether an amended or modified code becomes effective on the first day of January or July
scstatehouse.govSouth Carolina Building Codes Council, Building Codes in Effect for South Carolina (12/2022): the mandatory codes must be enforced by every South Carolina municipality and county; appendices to the mandatory codes may not be used by municipalities and counties unless the appendices are specifically adopted by the Building Codes Council; the 2021 editions were adopted on 6 October 2021 with an implementation date of 1 January 2023; modifications that have not been approved by the Council are invalid and cannot be adopted, employed or enforced by municipalities and counties
llr.sc.govSouth Carolina Building Codes Council, Building Code Adoption page: 2024 code modifications approved at the Council's meeting on 26 August 2025 and published in the State Register on 22 May 2026; 2021 South Carolina Building Codes effective 1 January 2023
llr.sc.govSouth Carolina Building Codes Council, 2024 Modification Index (11/3/2025 V.1): on 26 August 2025 the Council adopted the latest editions of the mandatory codes and select appendices, including the 2024 International Residential Code, and established the implementation date for local jurisdictions as 1 January 2027; IRC 2024 76, Appendix BB Tiny Houses, is adopted for use statewide (previous cycles: IRC 2021 79 Appendix AQ, IRC 2018 47 Appendix Q); IRC 2024 17, Section R309.2: an automatic residential fire sprinkler system shall not be required to be installed in one- and two-family dwellings
llr.sc.govSouth Carolina Building Codes Council, 2021 Modification Index: IRC 2021-79, Appendix AQ Tiny Houses, the provisions contained in this appendix are adopted for use statewide
llr.sc.govS.C. Code 6-29-720(A): once the governing body has adopted at least the land use element of the comprehensive plan, a municipality or county may adopt a zoning ordinance and within each district may regulate the use of buildings, structures and land, and the size, location, height, bulk, orientation and number of stories of buildings. 6-29-1110(3)(e): market-based incentives include design flexibility promoting infill development, mixed use and accessory dwellings. The phrase accessory dwelling appears nowhere else in Title 6, Chapter 29 (as read 7 October 2026)
scstatehouse.govS.C. Code 23-43-20(2): modular building unit means any building of closed construction, other than a mobile or manufactured home, constructed off-site in accordance with the applicable codes and transported to the point of use. 23-43-80: modular buildings must be certified by the council; certification is evidenced by a label attached by the manufacturer under the supervision of the approved inspection agency. 23-43-85: a single-family modular home must have a roof pitch of at least five feet rise for every twelve feet of run for homes with a single predominant roofline, eave projections of at least ten inches unless the roof pitch is at least seven in twelve, a first-story exterior wall height of at least seven feet six inches, and a perimeter foundation wall of brick, masonry or other permanent material; a variance may be appealed as provided in 23-43-120. 23-43-130: labeled units must be accepted as equivalent to a site-built structure; local land use and zoning, setbacks, site development and on-site installation requirements are reserved to local authorities and must be applied without any distinction as to whether a building is modular or constructed on site
scstatehouse.govSouth Carolina Building Codes Council, Modular Building Program: the program requires all modular building manufacturers to be licensed and to employ independent third party inspection agencies to inspect and certify that their buildings meet or exceed the required building codes
llr.sc.govS.C. Code 56-3-710: the Department of Motor Vehicles shall classify as a house trailer every trailer or semitrailer designed, constructed and equipped as a dwelling, living abode or sleeping place, permanently or temporarily, and equipped for use as a conveyance on streets or highways. 56-3-720: the camper or travel trailer class includes every trailer not more than thirty-five feet long and eight feet wide primarily equipped, designed, converted or used for private living quarters and towed by a motor vehicle
scstatehouse.govS.C. Code 56-19-10(10), house trailer, and (39), mobile home: every vehicle designed, constructed and equipped principally as a permanent dwelling place and equipped to be moved on streets and highways, but which exceeds the size limitations prescribed in Section 56-3-710. 56-19-510: an owner may affix a manufactured home to real property by installing it to the required standards, removing the wheels, axles and towing hitch, and filing the Manufactured Home Affidavit for the Retirement of Title Certificate; upon filing the home is treated for all purposes except condemnation as real property
scstatehouse.govCity of Charleston, Accessory Dwelling Unit (ADU): City Council approved an ordinance on 8 September 2020 permitting ADUs as a conditional use in all base zoning districts; not more than one ADU per lot and no more than two dwelling units on the lot; total conditioned floor area cannot exceed 850 sf; one parking space in addition to those required for the house; occupancy limited to two adults and any number of children; either the principal dwelling or the ADU must be owner-occupied under a recorded Declaration of Covenants and Restrictions; lots with an ADU are not eligible for a short-term rental permit
charleston-sc.govDorchester County, RV, Manufactured Home, and Tiny Home Policies: recreational vehicles cannot be used as dwelling units in Dorchester County and the County will not issue permits for utility connections nor addresses for RVs and campers; tiny homes built to applicable building codes either on-site or offsite and placed on a permanent foundation are considered single-family detached residences; tiny homes on wheels are considered recreational vehicles and cannot be used as a dwelling
dorchestercountysc.govGreenville County, Tiny Houses 400 Square Foot or Less, Residential Permitting Guidelines (revised 24 October 2017): permanent use off-site built options are a SC Modular Label for single family dwelling occupancy, or open construction installed on a site built, permitted, inspected foundation; RVs and park model units built to ANSI 119.5 are seasonal use only and are allowed only in approved RV parks or on an approved un-zoned parcel
greenvillecounty.org
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