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Permitting Authorities / Idaho / City of Twin Falls - Building Safety Department

Do you need a permit to replace a roof in Twin Falls, ID?

Adopted code

City of Twin Falls - Building Safety Department

No, Twin Falls, ID does not require a permit for like-for-like roof replacement (City of Twin Falls - Building Safety Department). Residential building permits can be applied for online through the City's Building Permit Portal, and the Building Safety Department also takes applications in person at 203 Main Avenue East. Inspections are requested through the same portal or by phone: building inspections 208-735-7333, the Building Department office 208-735-7238, plumbing 208-735-7299, mechanical 208-735-7289 and electrical 208-735-7235. The Department states that building and trade inspections scheduled through the portal by 7:00 a.m. are same-day, that a re-inspection fee of $50.00 is charged only where the same issue fails more than once and must be paid before the re-inspection is scheduled, and that a certificate of occupancy can take up to three business days to process. Published residential plan review timelines run about two weeks for a new single-family home and about two weeks for fences, decks and pools. Building permit fees are assessed on declared project valuation, and the City's fee schedule tells an applicant to declare "the total value of all construction work for which the permit is issued (including overhead and profit), as well as finished work, painting, roofing, mechanical, electrical, plumbing" and other permanent equipment. The Department's own standing warning, in its words: "NO WORK SHALL BE DONE UNTIL PERMITS ARE ISSUED.".

Roof code checklist: Twin Falls, ID

ItemAnswerCode citeSourceVerified
Permit to replace a roofNotfid.org2026-09-03
Repair permit thresholdPublishedtfid.org2026-09-03
Layer limit / roof-overNot published
Deck & sheathingNot published
Drip edgeNot published
Ice & water shieldNotfid.org2026-09-03
Mid-roof inspectionNotfid.org2026-09-03
Impact-resistant (Class 4) roofingNot published
Wind design criteriaPublishedtfid.org2026-09-03
Adopted codePublishedSec. 39-4116tfid.org2026-09-03
Contractor license / registrationYeslegislature.idaho.gov2026-09-03
Sales & use taxPublishedlegislature.idaho.gov2026-09-03

Each row comes from the sourced record on this page; full wording is in the table below. "Not published" means no official source for that item was found when the record was last verified.

Jurisdiction
City of Twin Falls, Idaho
Jurisdiction type
city
Address
203 Main Avenue East, Twin Falls, ID 83301
Contact
  • url: https://www.tfid.org/141/Building-Safety-Department
  • phone: 208-735-7238
Permit portal
Permit portal
Roofing permit required
Not required
Contractor registration required
Required
Registration details
  • state_level: STATEWIDE, AND INDEPENDENT OF WHATEVER THIS JURISDICTION REQUIRES. Idaho Code 54-5204(1), in the Idaho Contractor Registration Act (Title 54, Chapter 52): "On and after January 1, 2006, it shall be unlawful for any person to engage in the business of, or hold himself out as, a contractor within this state without being registered as required in this chapter." A roofer is inside the definitions rather than at their edge: "Construction" means "the performance of building, altering, repairing, adding to, subtracting from, improving, reconstructing, moving, excavating, wrecking or demolishing any building ... or improvement to real property, or to do any part thereof" (54-5203(2)), and "Contractor" means any person who "undertakes, offers to undertake, purports to have the capacity to undertake, or submits a bid to, or does himself or by or through others, perform construction" (54-5203(3)(a)). Roofing is not separately licensed in Idaho, so this registration is the whole of the state credential. THRESHOLD: 54-5205(2)(f) exempts work on "one (1) undertaking or project considered casual, minor, or inconsequential, whether by one (1) or more contracts, the aggregate contract price of which, for labor and materials and all other items, is less than two thousand dollars ($2,000)" -- a per-project figure covering labour and materials together, not annual revenue, and the same paragraph voids the exemption where the work is part of a larger project or where one job is split into sub-$2,000 contracts. A residential reroof is rarely under $2,000. An owner working on his own residential property is exempt (54-5205(2)(l)), as is an owner who hires a registered contractor (54-5205(2)(k)); an employee on wages is exempt but an unregistered subcontractor is not (54-5205(2)(a)). CONSEQUENCES OF NOT REGISTERING, and a homeowner should check: an unregistered contractor "shall be deemed to have conclusively waived any right to place a lien upon real property" (54-5208); may not "bring or maintain any action in any court of this state for the collection of compensation" without proving registration throughout the work (54-5217(2)); and is guilty of a misdemeanor punishable by a fine up to $1,000, up to six months in county jail, or both (54-5217(1)). AT THE PERMIT COUNTER: 54-5209(1) requires every county, municipality or district that issues building permits to request the contractor's Idaho registration number and print it on the face of the permit, or else print "no contractor registration provided"; 54-5209(2) requires the permit to be posted at the site so that statement is visible. WHAT IT TAKES: an application under oath, proof of worker's compensation coverage or a statement why it is not required, and a general liability policy including products and completed operations coverage of not less than $300,000 single limit (54-5210(1)). It is a registration, not a competency licence -- there is no examination. Administered by the Idaho Contractors Board within the Division of Occupational and Professional Licenses (54-5206(1)); registrations can be checked by name at the Division's public search.
  • city_level: Whether the City of Twin Falls requires a contractor to register with the City in addition to the state registration was not established in this research; the state registration above applies regardless. What the City demonstrably does is run the state requirement through its own permit counter, as Idaho Code 54-5209(1) directs. The Building Safety Department publishes a "Contractor Registration Exemption Declaration Form" on which an applicant claiming an exemption must tick the paragraph of Idaho Code 54-5205 he relies on -- the form lists all eighteen, (a) through (r), with a one-line gloss on each -- and sign that "I am not acting with the intent to evade the Contractor Registration requirement", acknowledging that "acting in the capacity of a contractor without a valid exemption is a misdemeanor crime, punishable by a fine not to exceed one thousand dollars ($1,000) or by imprisonment in the county jail for a term not to exceed six months, or by both". The Department also publishes a Change of Contractor Application and points applicants to the state's contractor registration search. There is a practical consequence of the City's reroofing permit exemption worth stating: a reroof that needs no permit never reaches that counter, so nobody there checks the registration -- but Idaho Code 54-5204(1) still requires it, and 54-5208 and 54-5217(2) still cost an unregistered roofer his lien rights and his right to sue for the money.
Permit process note
Residential building permits can be applied for online through the City's Building Permit Portal, and the Building Safety Department also takes applications in person at 203 Main Avenue East. Inspections are requested through the same portal or by phone: building inspections 208-735-7333, the Building Department office 208-735-7238, plumbing 208-735-7299, mechanical 208-735-7289 and electrical 208-735-7235. The Department states that building and trade inspections scheduled through the portal by 7:00 a.m. are same-day, that a re-inspection fee of $50.00 is charged only where the same issue fails more than once and must be paid before the re-inspection is scheduled, and that a certificate of occupancy can take up to three business days to process. Published residential plan review timelines run about two weeks for a new single-family home and about two weeks for fences, decks and pools. Building permit fees are assessed on declared project valuation, and the City's fee schedule tells an applicant to declare "the total value of all construction work for which the permit is issued (including overhead and profit), as well as finished work, painting, roofing, mechanical, electrical, plumbing" and other permanent equipment. The Department's own standing warning, in its words: "NO WORK SHALL BE DONE UNTIL PERMITS ARE ISSUED."
Adopted code
LOCALLY ENACTED, ON A STATE-MANDATED EDITION. The City of Twin Falls publishes its own locally-adopted residential codes on the Building Safety Department's residential design criteria page for one- and two-family dwellings and townhouses: the "2018 International Residential Code, Parts I-VI and IX, appendices A, B and G (with State amendments)", alongside the 2018 International Energy Conservation Code (with Idaho State amendments), the 2023 National Electrical Code and the 2017 Idaho State Plumbing Code. Note that the City lists more parts of the IRC than the State of Idaho adopts; roofing sits in Part III, which both include. Twin Falls has also written the state rule on which edition governs a job into its own policy, signed by the Building Official on November 26, 2024: "As per Idaho Code Section 39-4116, building permits shall be governed by the codes in effect at the time the permit application is received. The effective code on the application receipt date will guide the project to completion, unaffected by any updates or changes to the codes that occur after the application date." THE STATE FRAMEWORK: Idaho's residential code is set by the Idaho Building Code Board, not by the city. IDAPA 24.39.30.600.03 adopts the "International Residential Code, 2018 Edition ... Parts I, II, III, and IX of the 2018 Edition for one (1)- and two (2)-family dwellings", effective July 1, 2024, together with a list of state amendments; Idaho Code 39-4116(2) requires a local government that issues building permits and performs code enforcement to adopt the Idaho residential code parts I-III and IX by ordinance. Parts IV through VIII -- energy, mechanical, fuel gas, plumbing and electrical -- are not part of the Idaho residential code (Idaho Code 39-4109(1)(b)); roofing sits in Part III and is included. Idaho Code 39-4116(2) also bars a local jurisdiction from adopting provisions of a later IRC edition the Board has not adopted, so a city cannot be ahead of the state. Idaho Code 39-4116(6): "Permits shall be governed by the laws in effect at the time the permit application is received."
Ice & water shield
Not required — Sourced from the City of Twin Falls' own published design criteria, not inferred from climate. The Building Safety Department's residential design criteria for one- and two-family dwellings and townhouses print "Water and Ice Shield: NO (Must follow roof manufacture's installation requirements for underlayment)". So the City requires no ice barrier underlayment, and the underlayment actually used must go down to the roofing manufacturer's printed instructions, which the code makes binding. The same sheet gives the local conditions behind that call: ground snow load 15 psf, frost depth 24 inches, climate zone 5B, winter heating design temperature 2 degrees, and "Subject to damage from weathering: Severe". Idaho's state rule does not answer this question -- IDAPA 24.39.30.600.03 amends nothing in Chapter 9 of the 2018 International Residential Code, and Table R301.2(1) is the one part of Part III that Idaho Code 39-4116(4)(c) leaves a city or county free to fill in and amend for local conditions. About ice & water barrier
Mid-roof inspection
Not required — No mid-roof inspection in Twin Falls, on two independent grounds. First, the City of Twin Falls Building Safety Department publishes its residential inspection sequence -- the "RESIDENTIAL INSPECTION SCHEDULING PROCESS", nine numbered stages running footing and setback, foundation, shear, mechanical/electrical/plumbing rough, framing, insulation, gypsum, mechanical/electrical/plumbing final, and final building -- and not one of the nine inspects a roof in progress. Second, there is no reroofing inspection to schedule because the City requires no permit for a reroof. Where a permit does issue, for a new roof structure or new trusses, the roof framing is seen at the framing inspection, and the City asks that truss engineering be on site for it and that the mechanical, electrical and plumbing rough inspections be approved first.
Repair permit threshold
No permit for a reroof, and the line Twin Falls draws is scope, not size and not dollar value. The City of Twin Falls Building Safety Department states it on its own Permit Requirements page, in the list headed "Work requiring permits" under the page heading "Requirements": "Most alterations, including new built-up roofs/trusses, new windows, etc., require permits; a permit is not required for things such as interior wall paint, reroofing, or replacing the carpet." Read both halves of that sentence before assuming a job is exempt. Replacing a roof covering needs no permit at any size and any value; "new built-up roofs/trusses" -- a new roof structure, or new or replacement trusses -- does. So a tear-off that turns into framing or truss work moves back into permit territory, and the City states no square footage and no dollar figure anywhere in that sentence. The City writes no exempt-work list of its own and takes the code's instead: the same page states that "The City of Twin Falls will use section 105.2 of the currently adopted International Residential Code (IRC) and International Building Code (IBC) for work that is exempt from permits", and warns that "Exemption from permit requirements shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of the City, State or other adopted codes." That warning is the important half: the roof still has to be built to the adopted code, inspected or not. Consistent with the exemption, the Department publishes no reroofing permit application -- its residential applications are the new home, enclosed addition, not-enclosed addition, interior remodel and detached accessory forms. Where the scope is uncertain the Department asks for the call: "If you are uncertain if the work you are about to begin requires a permit, please contact the Building Safety Department by calling (208) 735-7238 before construction is started."
Wind design criteria
Wind speed 115 mph, which the City states as gust velocity. The City of Twin Falls Building Safety Department publishes these residential design criteria for one- and two-family dwellings and townhouses, each figure given here under the City's own label: "Wind Speed: 115 mph gust velocity"; wind exposure given as "B" with "C" in some areas; seismic design category given as "B", noted "IRC Structures Only-See Commercial Design Criteria for IBC"; "Elevation: 4,154 ft. at Twin Falls Airport"; "Frost Depth: 24 inches"; "Climate Zone: 5B"; "Presumed Soil Bearing Pressure: 1500 psf without soils investigation"; and "Snow load: Ground snow load 15 psf. Minimum uniformly distributed design roof load shall be 25 psf per local ordinance". Two of those bear directly on a roof. The 25 psf minimum design roof load is a local figure the City attributes to its own ordinance and it is the number to design to, not the 15 psf ground snow load. And wind exposure is site-specific here: the City gives B generally and C in some areas, so establish the exposure for the actual address. Beyond the words "gust velocity" the City does not print whether its 115 mph is a nominal or an ultimate design wind speed, and those are different numbers for the same loading, so confirm the basis with the Building Safety Department rather than converting it. One state fact belongs here and it is a wind fact: the State of Idaho deletes the model code's wind-borne debris opening-protection section statewide -- IDAPA 24.39.30.600.03(d) reads "Section R301.2.1.2 Protection of Openings. Delete." That is an opening provision for windows and doors rather than a roofing one, and under Idaho Code 39-4116(4)(b) a local jurisdiction may not re-adopt a provision the Idaho Building Code Board has expressly rejected.
Sales & use tax
6.0% -- the Idaho state rate, with no local add-on. Idaho Code 63-3619 imposes the state sales tax "at the rate of six percent (6%)". Idaho has only two kinds of local sales tax, and neither applies in Twin Falls: a resort-city local-option tax, which Idaho Code 50-1044 confines to resort cities "with a population not in excess of ten thousand (10,000)" and whose participating cities the Idaho State Tax Commission lists by name without Twin Falls among them; and an auditorium-district tax, which the Tax Commission states "can charge a local sales tax only for short-term lodging (30 days or less)" and so never reaches roofing work. Idaho counties levy no sales tax at all, so nothing is added for Twin Falls County. HOW A ROOF IS TAXED, which matters more than the rate: the Tax Commission's contractor guidance states that "Idaho sales tax law says contractors are the consumers (end users) of all the goods they use. As a result, they must pay sales tax on all purchases", and it names roofers among the contractors it covers. The roofer pays the 6% on materials at the supply house; the homeowner's invoice carries no sales tax line at all, on materials or on labour, because "a contractor doesn't charge sales tax to the customer" and the tax is absorbed into the bid. The Commission adds that "if sales tax is charged on the bill, the customer can refuse to pay it." A customer's own sales-tax exemption does not carry over to the contractor.

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The Building Safety Department is the City of Twin Falls' building authority, issuing and inspecting building, electrical, plumbing and mechanical permits inside the city limits. One thing here is unusual and it is the thing a roofer needs first: the Department states on its own Permit Requirements page that a permit is not required for reroofing, while a permit is required for new built-up roofs and trusses -- so the covering comes off and goes back on without a permit, but structural roof work does not. A permit exemption is not an exemption from the code. Twin Falls enforces the 2018 International Residential Code, and its own published residential design criteria set a 115 mph wind speed, a 25 psf minimum design roof load and no ice barrier underlayment requirement. Idaho contractor registration is required of the roofer either way, and the City publishes the exemption declaration form that goes with it.

No NOAA hail reports within 10 miles of Twin Falls, ID in the last 5 years (data through Oct 7, 2026).

Source: NOAA Storm Prediction Center severe weather database and daily storm reports (reports since the start of the current year are preliminary), within 10 miles of Twin Falls, ID (Census point). Data through Oct 7, 2026, not updated since. A report is an observation, not a damage record.

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Sources

Roofing questions: Twin Falls, ID

Do you need a permit to replace a roof in Twin Falls, ID?

No, Twin Falls, ID does not require a permit to replace a roof. No permit for a reroof, and the line Twin Falls draws is scope, not size and not dollar value. The City of Twin Falls Building Safety Department states it on its own Permit Requirements page, in the list headed "Work requiring permits" under the page heading "Requirements": "Most alterations, including new built-up roofs/trusses, new windows, etc., require permits; a permit is not required for things such as interior wall paint, reroofing, or replacing the carpet." Read both halves of that sentence before assuming a job is exempt. Replacing a roof covering needs no permit at any size and any value; "new built-up roofs/trusses" -- a new roof structure, or new or replacement trusses -- does. So a tear-off that turns into framing or truss work moves back into permit territory, and the City states no square footage and no dollar figure anywhere in that sentence. The City writes no exempt-work list of its own and takes the code's instead: the same page states that "The City of Twin Falls will use section 105.2 of the currently adopted International Residential Code (IRC) and International Building Code (IBC) for work that is exempt from permits", and warns that "Exemption from permit requirements shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of the City, State or other adopted codes." That warning is the important half: the roof still has to be built to the adopted code, inspected or not. Consistent with the exemption, the Department publishes no reroofing permit application -- its residential applications are the new home, enclosed addition, not-enclosed addition, interior remodel and detached accessory forms. Where the scope is uncertain the Department asks for the call: "If you are uncertain if the work you are about to begin requires a permit, please contact the Building Safety Department by calling (208) 735-7238 before construction is started."

Is ice & water shield required in Twin Falls, ID?

No. Sourced from the City of Twin Falls' own published design criteria, not inferred from climate. The Building Safety Department's residential design criteria for one- and two-family dwellings and townhouses print "Water and Ice Shield: NO (Must follow roof manufacture's installation requirements for underlayment)". So the City requires no ice barrier underlayment, and the underlayment actually used must go down to the roofing manufacturer's printed instructions, which the code makes binding. The same sheet gives the local conditions behind that call: ground snow load 15 psf, frost depth 24 inches, climate zone 5B, winter heating design temperature 2 degrees, and "Subject to damage from weathering: Severe". Idaho's state rule does not answer this question -- IDAPA 24.39.30.600.03 amends nothing in Chapter 9 of the 2018 International Residential Code, and Table R301.2(1) is the one part of Part III that Idaho Code 39-4116(4)(c) leaves a city or county free to fill in and amend for local conditions.

Do roofing contractors need a license or registration in Twin Falls, ID?

Yes.

What building code does Twin Falls, ID use?

LOCALLY ENACTED, ON A STATE-MANDATED EDITION. The City of Twin Falls publishes its own locally-adopted residential codes on the Building Safety Department's residential design criteria page for one- and two-family dwellings and townhouses: the "2018 International Residential Code, Parts I-VI and IX, appendices A, B and G (with State amendments)", alongside the 2018 International Energy Conservation Code (with Idaho State amendments), the 2023 National Electrical Code and the 2017 Idaho State Plumbing Code. Note that the City lists more parts of the IRC than the State of Idaho adopts; roofing sits in Part III, which both include. Twin Falls has also written the state rule on which edition governs a job into its own policy, signed by the Building Official on November 26, 2024: "As per Idaho Code Section 39-4116, building permits shall be governed by the codes in effect at the time the permit application is received. The effective code on the application receipt date will guide the project to completion, unaffected by any updates or changes to the codes that occur after the application date." THE STATE FRAMEWORK: Idaho's residential code is set by the Idaho Building Code Board, not by the city. IDAPA 24.39.30.600.03 adopts the "International Residential Code, 2018 Edition ... Parts I, II, III, and IX of the 2018 Edition for one (1)- and two (2)-family dwellings", effective July 1, 2024, together with a list of state amendments; Idaho Code 39-4116(2) requires a local government that issues building permits and performs code enforcement to adopt the Idaho residential code parts I-III and IX by ordinance. Parts IV through VIII -- energy, mechanical, fuel gas, plumbing and electrical -- are not part of the Idaho residential code (Idaho Code 39-4109(1)(b)); roofing sits in Part III and is included. Idaho Code 39-4116(2) also bars a local jurisdiction from adopting provisions of a later IRC edition the Board has not adopted, so a city cannot be ahead of the state. Idaho Code 39-4116(6): "Permits shall be governed by the laws in effect at the time the permit application is received."

Is a mid-roof inspection required in Twin Falls, ID?

No. No mid-roof inspection in Twin Falls, on two independent grounds. First, the City of Twin Falls Building Safety Department publishes its residential inspection sequence -- the "RESIDENTIAL INSPECTION SCHEDULING PROCESS", nine numbered stages running footing and setback, foundation, shear, mechanical/electrical/plumbing rough, framing, insulation, gypsum, mechanical/electrical/plumbing final, and final building -- and not one of the nine inspects a roof in progress. Second, there is no reroofing inspection to schedule because the City requires no permit for a reroof. Where a permit does issue, for a new roof structure or new trusses, the roof framing is seen at the framing inspection, and the City asks that truss engineering be on site for it and that the mechanical, electrical and plumbing rough inspections be approved first.