City of Watertown, South Dakota - Building Inspection / Licenses & Permits

City of Watertown, South Dakota

city

20 N. Maple Street, Watertown, SD 57201

Required

Required

Resolved 2026-08-10 by the decision rule set when the ordinance and the city's operations disagreed: the city's own permitting portal record for the "Reroofing Permit" states its scope as "either Residential or Commercial reroofing projects" with mandatory submittals (the Roofing Fillable Standard Plate) and photos throughout the installation for required inspections; it is not limited to decking or structural repairs. The ordinance-book exemption (Ord 18-27, Rev 12-28-18, amended IRC R105.2) for "[r]eplacement of siding, gutters, downspouts, storm windows, storm doors, or similar type roofing materials" is therefore read as covering those component replacements, not full reroofs. See repair_permit_threshold for the full exemption text and history.

2018 International Residential Code, Chapters 1-23 and 43, and Appendices H and J, adopted with local amendments at Title 5, Chapter 5.03, Sec. 5.0301(2) of the city's Revised Ordinances (Ord 18-27, most recently revised 12-28-18). The same ordinance separately adopts the 2018 International Building Code (Chapters 1-26, 30-35, Appendices C and I) at Sec. 5.0301(3). South Dakota has no mandatory statewide residential building code - SDCL ch. 11-10 sets up a local-option framework - so the 2018 IRC is Watertown's own choice of edition, not an inherited state mandate.

Required — The city adopts the 2018 IRC (Ord 18-27, Title 5, Chapter 5.03). Its lettered amendment list (items a. through zz., read in full) does not touch drip edge (IRC Sec. R905.2.8.5), so the base 2018 IRC drip-edge requirement applies unmodified. About drip edge

Required — Table R301.2(1), as filled in by the city's amendment (Ord 18-27, Rev 12-28-18), states "Ice Shield Underlayment Required - Yes." The city separately amends IRC Sec. R905.1.2 (Ice Barrier), extending the required membrane from the base-code 24 inches to 36 inches inside the exterior wall line: "Section R905.1.2 Ice Barrier. Amend '24 inches (610 mm) inside the exterior wall line of the building' to '36 inches'." About ice & water barrier

Not required — I read Title 5, Chapter 5.03 of the city's Code of Ordinances in full (the 2018 IRC/IBC adoption chapter and its full lettered amendment list, items a. through zz.) and searched the full 584-page Ordinance Book for staged-inspection terms. The only inspection provision touching Sec. R109 adds general applicant-responsibility language ("All construction or work for which a permit is required shall be subject to inspection by the Building Official... the permit applicant to cause the work to remain accessible and exposed for inspection purposes"); no mid-roof, dry-in, sheathing, or other staged inspection distinct from a final inspection is named anywhere in the document for roofing work.

Not required — I read Title 5, Chapter 5.03 of the city's Code of Ordinances in full (the 2018 IRC/IBC adoption chapter and its full lettered amendment list, items a. through zz., which is the only place the city modifies IRC Chapter 9 roofing provisions) and searched the full 584-page Ordinance Book text for "UL 2218" and "Class 4" - neither term appears anywhere in the document. No impact-resistant or Class 4 shingle mandate appears in the city's adopted code or its amendments.

Watertown sets no dollar-value threshold; its permit exemption is scoped by the TYPE of work, not job cost. The city's own amendment to IRC Sec. R105.2 (Ord 18-27, Rev 12-28-18) exempts "[r]eplacement of siding, gutters, downspouts, storm windows, storm doors, or similar type roofing materials" from the permit requirement regardless of value. Pulling the other way, the city's own Licenses & Permits page and its OpenGov citizen portal both list a "Reroofing Permit" as a distinct permit type, which is not how a city usually treats work it has exempted. Both of these are true of Watertown today and they point in opposite directions. The portal record's own scope language resolves the conflict: opened 2026-08-10, the Reroofing Permit record type states "Use this permit for either Residential or Commercial reroofing projects," with required submittals (the Roofing Fillable Standard Plate) and photos throughout the installation for required inspections. The permit is not limited to decking or structural work, so the ordinance's type-of-work exemption is read as covering siding, gutters, downspouts and similar components rather than full reroofs.

Table R301.2(1) (Climatic and geographic design criteria) as filled in by the city's amendment (Ord 18-27, Rev 12-28-18): Ground Snow Load 50 psf; Wind speed 90 mph; Seismic Design Category A; Weathering Severe; Frost line depth 48" to bottom of footing; Termite Slight to moderate; Decay None to slight; Ice Shield Underlayment Required - Yes; Air Freezing Index 3033; Mean Annual Temperature 42.1 F.

The city adopts the 2018 IRC (Ord 18-27, Title 5, Chapter 5.03). Its lettered amendment list (items a. through zz., read in full) does not touch roof recovering/replacement layer limits (IRC Chapter 9, Sec. R907), so the base 2018 IRC provisions on roof layers apply unmodified. No Watertown-specific layer-count figure is published in the city's own Code of Ordinances.

The city adopts the 2018 IRC (Ord 18-27, Title 5, Chapter 5.03). Its lettered amendment list (items a. through zz., read in full) does not touch deck sheathing requirements, so the base 2018 IRC sheathing provisions apply unmodified. No Watertown-specific sheathing thickness or material figure is published in the city's own Code of Ordinances.

South Dakota taxes roofing work as a realty improvement under the contractors' excise tax rather than as a retail sale, so the rate that governs a Watertown roofing contract is the state contractors' excise tax: SDCL ch. 10-46A imposes a 2% excise tax on the gross receipts of prime contractors and subcontractors performing construction services and realty-improvement projects, and every contractor must hold a Contractor's Excise Tax Licence from the South Dakota Department of Revenue. This excise-tax regime is statewide and applies in Watertown identically to everywhere else in South Dakota; Watertown's own Chapter 12.06 residential-contractor-license application separately requires applicants to supply their excise tax number, cross-referencing the two regimes locally.