Do you need a permit to replace a roof in Plymouth, MN?

Roofing questions — Plymouth, MN

Do you need a permit to replace a roof in Plymouth, MN?

Required. NO MINIMUM-SIZE THRESHOLD FOUND -- Plymouth's Residential Building Permit page states a blanket rule with no size exemption: "A permit is required to reroof a residence." A separate Plymouth "Reroofing Information Sheet" (Building Inspection Division; note: this document is dated 7/15 and is drafted against the SUPERSEDED 2015 Minnesota State Building Code / 2012 IRC, not the current 2020 MSBC / 2018 IRC -- flagged as a staleness caveat for anything code-specific in it) repeats the same blanket framing with no square-footage carve-out. This contrasts with Bloomington, MN (in this same research batch), which has an explicit 100-sq-ft ("one square") threshold. Absence of a stated threshold across two Plymouth documents is treated here as moderate-confidence evidence that Plymouth requires a permit for reroofing work of any size, not as a confirmed "no threshold exists" finding -- an architect phone/portal check with the Building Inspection Division (763-509-5430) would raise this to CONFIRMED.

Is ice & water shield required in Plymouth, MN?

Required — STATE-GOVERNED, NOT CITY-SET -- applies identically in Plymouth as everywhere else in Minnesota. Minnesota Rules part 1309.0301, subpart 2 amends IRC Table R301.2(1) ("Climatic and Geographic Design Criteria") to pre-fill "ICE BARRIER UNDERLAYMENT REQUIRED[h] ... Yes" for the entire state. A Minnesota DLI consumer guidance sheet ("Asphalt Shingle Roofing and the 2020 Minnesota Residential Code," Construction Codes and Licensing Division) hosted on Plymouth's own website states directly: "Ice barrier protection at eaves is required in Minnesota," using "an ice barrier that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet... extend[ing] from the eave's edge to a point at least 24 inches inside the exterior wall line of the building." On slopes between 2:12 and 4:12, the sheet notes "a double underlayment application in accordance with Section R905.2.7" is required due to greater ice-dam risk. Plymouth has no authority to opt out of this (Minn. Stat. § 326B.121, subd. 2(c)). GARAGE NUANCE / ESCALATION: an older (2015-vintage, drafted against the now-superseded 2015 MSBC/2012 IRC -- staleness caveat applies) Plymouth "Reroofing Information Sheet" states the ice-barrier exception as: "Detached accessory structures (garages and storage buildings) that contain no conditioned floor areas are not required to have an ice barrier" -- i.e. the exemption turns on CONDITIONED status, not simply attached/detached. This matches Bloomington, MN's framing in this same research batch ("required for all attached garages and for all detached HEATED garages") but is narrower than Maple Grove, MN's own current roofing handout, which exempts "detached accessory buildings (garages)" with no heated/conditioned qualifier at all. Flagged as a genuine ESCALATION across this 3-city batch: since ice-barrier applicability is state-governed code content, Maple Grove's broader blanket exemption may overstate the actual (conditioned-space-based) state rule -- an architect with ICC access to the current R905.1.2 text should resolve which framing is correct..

Is drip edge required?

Not required — STATE-GOVERNED, NOT CITY-SET. Minnesota Rules part 1309.0905, subpart 2 deletes base IRC Section R905.2.8.5 (the drip-edge section) "in its entirety." This repo's MN state-lever scout could not obtain the underlying 2018 IRC R905.2.8.dli.mn.gov), which states under a "Drip edge" heading, verbatim: "Drip edge is not required unless specifically required by the manufacturer's installation instructions." This is a state DLI-authored, DLI-branded document (not a Plymouth-specific interpretation) that Plymouth happens to host as a resident resource on its Residential Building Permit page; Plymouth has no authority to require drip edge beyond this state baseline (Minn. Stat. § 326B.121, subd. 2(c)). LONGSTANDING ACROSS CODE CYCLES: an older (2015-vintage, superseded 2015 MSBC/2012 IRC -- staleness caveat applies to its other content) Plymouth "Reroofing Information Sheet" states the identical conclusion under its prior code cycle: "Metal drip edge -- Is not required by the Minnesota Residential Code," suggesting this has been Minnesota's consistent position across at least two code cycles, not a one-time or transitional rule..

Do roofing contractors need a license or registration in Plymouth, MN?

Required. Minnesota has a statewide mandatory Residential Roofer (RR) license, per Minn. Stat. § 326B.805, subd. 1: "A person who meets the definition of a residential roofer as defined in section 326B.802, subdivision 14, must be licensed by the commissioner as a residential roofer, residential building contractor, or residential remodeler," enforced statewide (subd. 3) with a $15,000 gross-annual-receipts exemption threshold (subd. 6(5)) requiring an affirmative Certificate of Exemption. Roofing is explicitly excluded from the general single-special-skill exemption that applies to other trades (subd. 6(8)). Administered by MN DLI, not the City of Plymouth. Plymouth's own Residential Building Permit page states: "A permit is required to reroof a residence. Permits may be obtained by either the homeowner or a contractor who is licensed by the State of Minnesota, Department of Labor and Industry," and separately links out to "state residential contractor licensing information" rather than describing any city-specific license -- consistent with Plymouth imposing NO additional city-level contractor registration on top of the state RR license, but this is an inference from absence rather than an affirmative "no local license" statement, so flagged MODERATE-CONFIDENCE rather than fully confirmed..

What building code does Plymouth, MN use?

STATE-GOVERNED, NOT CITY-SET. Plymouth has no authority to adopt a different building code from the Minnesota State Building Code: Minn. Stat. § 326B.121, subd. 1(a)-(b) makes the State Building Code "the standard that applies statewide" and states it "supersedes the building code of any municipality," and subd. 2(c) bars a municipality from requiring "building code provisions regulating components or systems of any structure that are different from any provision of the State Building Code" by ordinance. The residential chapter is Minnesota Rules, Chapter 1309 ("Minnesota Residential Code"), which incorporates the 2018 International Residential Code (IRC) by reference "except as qualified by the applicable provisions in Minnesota Rules, chapter 1300, and as amended in this chapter" (Minn. R. 1309.0010, subpart 1), effective as the "2020 Minnesota Residential Code" published 2020-03-31. Plymouth, as a metro-area municipality that adopted the State Building Code before 2008, is required under Minn. Stat. § 326B.121, subd. 2(a) to continue administering and enforcing this same statewide code -- it has no local variance authority over code content. A Minnesota DLI consumer guidance sheet hosted on Plymouth's own website corroborates directly: "The 2020 Minnesota Residential Code adopts the 2018 International Residential Code (IRC)... The Minnesota State Building [Code] is the standard of construction for the entire state (Minnesota Statute 326B.121)." Per this repo's MN state-lever research (staging/burn-wave/MN_STATE_LEVER.md), cited here rather than re-derived.