Plymouth — Nonconforming Uses

Last reviewed: July 2, 2026

Overview

This page summarizes how the City of Plymouth treats nonconforming uses, structures, and lots under the local Zoning Code (commonly packaged as a zoning title). The controlling rules live in Chapter 19.38 (Nonconforming Uses and Structures) and the related definitions, district use tables, and development standards chapters cited below. This is a plain‑English synthesis and points you to the specific code sections you must check for a parcel‑specific decision. See § 19.38.010 for the chapter purpose and scope.

What Plymouth code says (top-line rules)

• The City will allow existing lawful nonconforming buildings, structures, and uses to continue, but intends to discourage their long‑term continuation and provides rules to phase them out (§ 19.38.010).
• A nonconforming building or structure may be maintained, but no physical changes are allowed except maintenance and repair unless other code sections permit changes (§ 19.38.030).
• A nonconforming use may continue provided there is no increase in the area, space, or volume devoted to that use (§ 19.38.040).
• Abandonment or discontinuance for one year or more eliminates the legal nonconforming status — after that the use may not be resumed (§ 19.38.060).
• Nonconforming land uses (where no main building exists) must be discontinued within one year after the code takes effect or after an amendment that makes the land use nonconforming (§ 19.38.090).
• Reconstruction after damage is allowed, but the City uses a 60% assessed value threshold: repairs ≤60% can be rebuilt ministerially; >60% requires a conditional use permit to restore the prior nonconforming pattern — otherwise new construction must meet current standards (§ 19.38.140).
• Signs and billboards follow Chapter 19.92 rules for nonconforming signs (§ 19.38.100).
• Buildings under valid permits with construction started within 60 days of permit issuance may be completed under prior approvals (§ 19.38.130).
• Where a parcel is legally nonconforming (lot size or dimensions) it may still be used or developed according to Chapter 19.38 (see § 19.04.040.D).

District-by-district breakdown (what matters for nonconformance)

Below are Plymouth’s base zoning districts and the code sections that define their allowed uses and development standards. For nonconforming situations the baseline rules in Chapter 19.38 apply, but the district designation determines whether a use is normally permitted (so a pre‑existing use may be nonconforming in one zone but conforming in another). Use the tables cited for permit status and the development standards tables for dimensional checks.

Note: each district name is bolded here and the first natural mention of related topics is linked to the internal Plymouth menu pages required by this guide (parking, design review, development standards, overlays, ADUs, and Title 24).

• A (Agriculture) — purpose: very low‑density agricultural and related residential options in the SOI; typical permitted uses include crop production, animal husbandry, limited dwellings; minimum lot area is 40 acres per table; see Table 19.56.040‑1 (Residential zone development standards) for setbacks/density and Table 19.56.030‑1 for uses (§ 19.56.040; § 19.56.030).

• RR (Rural Residential) — purpose: larger‑lot fringe residential; typical permitted uses include single‑family, some agricultural uses; minimum lot area 12,000 sq ft in the table; front setback 20–30 ft options; see Table 19.56.040‑1 and Table 19.56.030‑1 (§ 19.56.040; § 19.56.030).

• SR (Standard Residential) — purpose: principal single‑family neighborhoods; typical uses: single‑family detached, accessory units; minimum lot area down to 2,000 sq ft (varies by plan), front setback 14–20 ft depending on active living or garage placement; maximum lot coverage 50%; see § 19.56.040 and Table 19.56.030‑1.

• VR (Village Residential) — purpose: higher‑density multifamily near downtown; allows multifamily up to three stories; minimum lot area 2,000 sq ft, lot coverage 75%, front setback 5 ft; see § 19.56.040 and Table 19.56.030‑1.

• VC (Village Commercial) — purpose: downtown pedestrian commercial core; uses: retail, restaurants, offices (see Table 19.60.030‑1); development standards include no minimum lot area, a FAR min 0.4 / max 1.86, front setback 0 ft, and max lot coverage 80% (see § 19.60.040 and Table 19.60.030‑1).

• SC (Suburban Commercial) — purpose: auto‑oriented commercial mix; typical uses per Table 19.60.030‑1; minimum lot 6,000 sq ft, front setback 5 ft, FAR and coverage listed in Table 19.60.040‑1 (§ 19.60.040; § 19.60.030).

• HC (Highway Commercial) — purpose: automobile‑serving uses along Highway 49; uses and permit requirements in Table 19.60.030‑1; minimum lot 9,000 sq ft, front setback 25 ft, residential buffer and other standards in Table 19.60.040‑1 (§ 19.60.040; § 19.60.030).

• I/BP (Industrial / Business Park) — purpose: higher‑intensity industrial and business uses; uses in Table 19.60.030‑1; minimum lot 12,000 sq ft, residential buffer 100 ft where abutting residential; see § 19.60.040 and Table 19.60.030‑1.

• P (Public/Institutional) and OS (Open Space) — purpose: civic, parks, schools and natural resource protection; allowed uses and disposition are in Table 19.64.030‑1; development standards generally follow nearby commercial standards when abutting developed areas (§ 19.64.020; § 19.64.030).

• Overlays: DH (Downtown Historic Overlay), HSC (Highway Scenic Corridor Overlay), MRP (Mineral Resource Protection Overlay), and High Density Overlay — overlays supplement the base zone; they generally allow the underlying uses but add standards like Design Review. DH and HSC explicitly require Design Review and apply to mapped downtown/Main St and Highway 49 areas (§ 19.66.020–030). For nonconforming signs the signs chapter (19.92) applies (§ 19.38.100).

Practical note: whether an existing use is "nonconforming" depends on the current zone (see Table 19.56.030‑1 and Table 19.60.030‑1) and the City Zoning Map; verify district at the parcel level (§ 19.48.030).

Related code references: allowed use matrices are in Table 19.56.030‑1 (residential) and Table 19.60.030‑1 (commercial/industrial) — consult them to see whether a pre‑existing use is now listed as "P", "AUP", "CUP", or "N".

Quick reference table — decision‑relevant standards for nonconforming situations

Checklist — what an applicant must demonstrate or bring

• Proof that the existing use/structure/lot was lawful when established (historic permits, dated photographs, building/occupancy records). Verify district on the City Zoning Map (§ 19.48.030).
• Demonstrate no enlargement of area, space or volume for a nonconforming use (or show what portion is lawful nonconforming) per § 19.38.040.
• If proposing reconstruction after damage, provide cost estimate and assessor value documentation to test the 60% threshold in § 19.38.140.
• If the proposal would change a nonconforming use to another use, confirm whether the change is to a conforming use (change to conforming use is permanent — § 19.38.050) or to a more restrictive nonconforming use without structural alterations (§ 19.38.070).
• If the parcel is a legal nonconforming lot, include subdivision/parcel records and rely on Chapter 19.38 rules for development (§ 19.04.040.D; Chapter 19.38).
• Plans must comply with the applicable development standards (setbacks, lot coverage, FAR) in Table 19.56.040‑1 or Table 19.60.040‑1 unless a CUP/variance is approved (§ 19.56.040; § 19.60.040). Link to Plymouth Development Standards.
• Where applicable, prepare to meet Design Review requirements (overlays or downtown areas) — see Chapter 19.18 and the Downtown Historic Overlay rules (§ 19.66.020). Link to Plymouth Design Review.

Risks & Ambiguities

Plain‑English summary

If your use, building, or lot in Plymouth was legal when it started but no longer meets today’s zoning rules, Plymouth lets you keep using or maintaining it—so long as you don’t expand it, let it sit unused for a year, or rebuild it past certain cost thresholds without extra approvals. The exact rules you must follow are in Chapter 19.38 (Nonconforming Uses and Structures) and depend on your zone’s usual permitted uses and development standards (see the use tables and development standard tables cited).

Information Gaps

• Exact approving authority entries in Table 19.04.140‑1 (who issues CUPs in each situation) — § 19.04.140 references the table but the table entries were not extracted here. Verify with the Planning Department. Not found in retrieved materials.
• Parcel‑specific historical evidence (prior permits, assessor valuation details) — these are not in the code and must be requested from City Records/Assessor. Not found in retrieved materials.
• City amendments or administrative practices after the last code snapshot supplied here — confirm the current code online or with City staff. Not found in retrieved materials.

Source References

• Plymouth Zoning Code — Chapter 19.38 (Nonconforming Uses and Structures): § 19.38.010 through § 19.38.150.
• Plymouth Zoning Code — Nonconforming reconstruction rule: § 19.38.140 (60% threshold).
• Definitions (nonconforming lot / use / structure): Glossary entries (Chapter 19.98 definitions for “Nonconforming Lot,” “Nonconforming Structure,” “Nonconforming Use”).
• Residential allowed uses and standards: Table 19.56.030‑1 and Table 19.56.040‑1 (Residential/Agricultural districts and development standards). § 19.56.030; § 19.56.040.
• Commercial/Industrial allowed uses and standards: Table 19.60.030‑1 and Table 19.60.040‑1. § 19.60.030; § 19.60.040.
• Overlays: Chapter 19.66, Downtown Historic Overlay and Scenic Corridor Overlay (DH, HSC). § 19.66.020–030.
• Legal parcel / applicability: § 19.04.040.D (legal nonconforming parcels may be used or developed in compliance with Chapter 19.38).
• Signs: Nonconforming signage governed by Chapter 19.92 (reference in § 19.38.100).

Useful internal links referenced in the text above (first natural mention of each): Plymouth Zoning & Planning overview, Plymouth Zoning, Plymouth Land Use, Plymouth Development Standards, Plymouth Parking, Plymouth Design Review, Plymouth Overlay Districts, Plymouth ADUs, and California Building Standards Code.

Retrieved passages

• Plymouth Zoning Code (title shall) High relevance show source text
• Plymouth Zoning Code (§ 1) High relevance show source text
• Plymouth Zoning Code (§ 1) High relevance show source text
• Plymouth Zoning Code (§ 1) High relevance show source text
• Plymouth Zoning Code Medium relevance show source text
• Plymouth Zoning Code (title for) Medium relevance show source text
• Plymouth Zoning Code (§ 1) Medium relevance show source text
• Plymouth Zoning Code (§ 19.38.140.) Medium relevance show source text
• Plymouth Zoning Code (§ 1) Medium relevance show source text
• CBC § 66314 (§ 66314) Medium relevance show source text
• Plymouth Zoning Code (§ 1) Medium relevance show source text
• Plymouth Zoning Code Medium relevance show source text
• Plymouth Zoning Code (§ 1) Medium relevance show source text
• Plymouth Zoning Code (chapter are) Medium relevance show source text

Cited sections

• Plymouth Zoning Code — Chapter 19.38 (Nonconforming Uses and Structures): **§ 19.38.010** through **§ 19.38.150**. (Chapter 19.38)
• Plymouth Zoning Code — Nonconforming reconstruction rule: **§ 19.38.140** (60% threshold). (§ 19.38.140)
• Definitions (nonconforming lot / use / structure): Glossary entries (Chapter **19.98** definitions for “Nonconforming Lot,” “Nonconforming Structure,” “Nonconforming Use”).
• Residential allowed uses and standards: Table **19.56.030‑1** and **Table 19.56.040‑1** (Residential/Agricultural districts and development standards). § 19.56.030; § 19.56.040. (§ 19.56.030)
• Commercial/Industrial allowed uses and standards: Table **19.60.030‑1** and **Table 19.60.040‑1**. § 19.60.030; § 19.60.040. (§ 19.60.030)
• Overlays: Chapter **19.66**, Downtown Historic Overlay and Scenic Corridor Overlay (DH, HSC). § 19.66.020–030. (§ 19.66.020)
• Legal parcel / applicability: § 19.04.040.D (legal nonconforming parcels may be used or developed in compliance with Chapter 19.38). (§ 19.04.040.D)
• Signs: Nonconforming signage governed by Chapter **19.92** (reference in § 19.38.100). (§ 19.38.100)
• Plymouth_ZoningCode.md
• 2025 California Residential Code.md
• 2025 California ADU handbook.md

• Official Plymouth code library