Do I Need a Building Permit in South Dakota?
South Dakota building permit rules. The 2021 International Building Code is the design standard even where a local government has adopted no ordinance, and residential requirements have a statutory ceiling.
South Dakota answers this by splitting non-residential from residential, and by covering the case where your local government has no ordinance at all. Where a local unit of government has not adopted a building code ordinance, the design standard for building work commenced after 1 July 2021 “shall be based on the 2021 edition of the International Building Code” — but that section expressly does not apply to residential structures, mobile or manufactured homes, or farmsteads.
Where your local government has adopted an ordinance
Section 11-10-5 governs the case where a local unit of government adopts an ordinance prescribing standards for construction and related work “of any building other than a residential structure as defined in §11-10-12”. In that case “the ordinance shall comply with the 2021 edition of the International Building Code as published by the International Code Council, Incorporated.” The local body is not locked to the text, though: “the governing body may amend, modify, or delete any portion of the International Building Code before enacting such an ordinance”, and further changes take effect on adoption and filing — with the municipal finance officer for a municipal ordinance, or the county auditor for a county one. That filing requirement is useful, because it tells you where the authoritative current text of your local amendments is held.
Where it has not adopted one, the code still sets the standard
This is the part that surprises people who assume no ordinance means no standard. Under § 11-10-6, within the boundaries of a local unit of government “that has not adopted an ordinance prescribing such standards pursuant to §11-10-5”, the design standard for work commenced after 1 July 2021 is based on the 2021 International Building Code regardless. The section adds that “each local unit of government may adopt an ordinance allowing local administration and enforcement of the design standard”, so administration is a separate decision from the standard itself. The carve-outs are broad and worth reading: the section does not apply “to any residential structure as defined in §11-10-12, mobile or manufactured home, or farmstead and any accessory structure or building thereto”, and it defines farmstead to mean “a farm or ranch, including any structure or building located on the land.”
Residential work, and a ceiling rather than a floor
Residential structures are handled by § 11-10-12. A municipality “may enact requirements for construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, removal, and demolition of a residential structure by adopting the 2021 edition of the International Residential Code”, and “may, at any time, amend any provision” of it. But the amendment power runs one way only. The governing body “may not require the installation of a sprinkler system in a residential structure or impose any requirements that are more stringent than the requirements in the 2021 edition of the International Residential Code.” That makes the 2021 IRC a ceiling for South Dakota residential work, which is the reverse of the usual arrangement where a model code is a minimum a locality may exceed.
What counts as a residential structure
Because the residential and non-residential routes diverge so sharply, the definition matters. Section 11-10-12 provides that “the term, residential structure, means a detached one-family or two-family dwelling, and townhouses not more than three stories in height with a separate means of egress and their accessory structures.” So a detached house, a duplex, a qualifying townhouse and their accessory structures follow the residential route under § 11-10-12, while anything outside that definition falls under § 11-10-5 or § 11-10-6 and the International Building Code. Section 11-10-5 also carries its own residential protection: under that section “no ordinance may require that any fire sprinkler be installed in a single family dwelling.”
Energy standards are voluntary, and some buildings sit outside
South Dakota's energy code is expressly not mandatory for homes. Section 11-10-7 provides that the state “hereby adopts the International Energy Conservation Code of 2009, published by the International Code Council, as the voluntary standard applying to the construction of new residential buildings in the state.” Both §§ 11-10-5 and 11-10-6 also exclude certain buildings entirely. Neither reaches mobile or manufactured homes as defined in the cited chapter that were “constructed in compliance with the applicable prevailing standards of the United States Department of Housing and Urban Development at the time of construction”, and neither applies to “any specialty resort or vacation home establishment as defined in chapter 34-18 that is constructed in compliance with the requirements of Group R-3 of the 2021 edition of the International Building Code.”
In South Dakota, first work out whether your project is a residential structure — a detached one- or two-family dwelling, or a townhouse of not more than three stories with a separate means of egress, plus their accessory structures. If it is, § 11-10-12 lets your municipality adopt and amend the 2021 International Residential Code, but it may not require a residential sprinkler system or impose anything more stringent than that code, so the IRC operates as a ceiling. If it is not residential, the 2021 International Building Code sets the standard whether or not your local government has adopted an ordinance: where it has, the ordinance must comply with that code subject to amendments filed with the municipal finance officer or county auditor; where it has not, the code still applies as the design standard, though administration and enforcement need a separate local ordinance. Farmsteads — a farm or ranch and any building on the land — mobile and manufactured homes built to HUD standards, and qualifying specialty resorts and vacation home establishments sit outside these provisions. The energy code is a voluntary standard for new residential buildings, not a requirement.
Based on the International Residential Code (IRC) and International Building Code (IBC) model codes. Every jurisdiction adopts a specific edition with its own local amendments — check your city’s permit page for the exact codes in force and their source citations.