Local zoning · Morro Bay

Morro Bay — Nonconforming Uses

Nonconforming Uses under the Morro Bay local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

This page explains how Morro Bay’s Zoning Code treats nonconforming uses, structures, and lots (Title 17, Chapter 17.26) — what can continue, what repairs and additions are allowed, when a nonconforming use must stop, and what approvals (if any) are required to expand or substitute a nonconforming use. The rules apply citywide and also operate together with district development standards (setbacks, height, lot coverage) and overlay/LCP rules. See the code for the full legal text: the nonconforming rules are collected in Chapter 17.26. § 17.26.010–070 .

Key takeaways up-front:

  • Lawful pre‑existing uses/structures/lots may continue but their rights are limited (see § 17.26.030) .
  • Repairs and small maintenance are generally allowed; structural work and rebuilding have a 50% repair threshold that triggers compliance with current code for many nonresidential situations (see § 17.26.040 and § 17.26.050) .
  • Expansion, substitution, or relocation of a nonconforming use is restricted and usually requires Planning Commission action with specific findings (see § 17.26.060) .
  • A nonconforming use that is abandoned or vacated for six months cannot be resumed (see § 17.26.070) .

Before you act, check the district development standards (setbacks, height, lot coverage) because many allowed repairs/additions are expressly conditioned on not increasing the nonconformity; see the development standards tables and related standards. For setback and development standards, consult the Morro Bay development standards pages and the relevant district tables in Title 17 (examples cited below) . If your work triggers exterior changes you will often also face design review and parking rules in Chapter 17.27 and the parking standards . Where ADUs are part of the plan, consult the local ADU rules and state ADU law; local nonconforming zoning cannot be used to block statutorily‑protected ADUs — see the local code and state law (see ADUs and California ADU law).

What the nonconforming rules actually say (chapter & sections)

  • Purpose: continuation but controlled removal where necessary — § 17.26.010 .
  • Applicability: applies to things made nonconforming by adoption/amendment of Title 17 or map changes — § 17.26.020 .
  • Definition and right to continue: a lawfully established pre‑existing use/structure/lot that does not meet Title 17 is a nonconformity; right to continue attaches to the land but is limited (no enlargement, substitution, expansion except as allowed) — § 17.26.030 .
  • Maintenance/repairs/alterations: nonstructural maintenance and interior repairs allowed if they don't enlarge footprint/height; structural repairs allowed in limited circumstances; additions allowed only if they do not increase the discrepancy between existing conditions and current requirements (i.e., do not increase nonconformity), with specific residential setback rules — § 17.26.040 .
  • Damage & rebuilding: replacement allowed by right if repair cost ≤50% of replacement cost prior to damage; if >50% then different rules apply (nonresidential nonconforming use must cease; some small residential cases up to three units may rebuild under conditions) — § 17.26.050 .
  • Expansion/change/substitution: nonconforming uses shall not be expanded, moved, or changed except by Planning Commission approval with required findings; substitution with another nonconforming use is possible only by conditional use permit and with further findings and potential amortization scheduling — § 17.26.060 .
  • Abandonment: no resumption after six months of vacancy/utility cutoff/license lapse/lease termination — § 17.26.070 .
  • Special removal: structures with assessed value ≤ $2,500 when they became nonconforming must be removed or made conforming within five years — § 17.26.030(C) .
  • Nonconforming signs: treated in Chapter 17.29; maintained only under sign standards — see § 17.26.040(D) and Chapter 17.29 .

Below I translate those legal rules into practical, parcel‑specific guidance and connect them to the district rules you will use to measure nonconformity.

District‑by‑district breakdown (purpose, typical permitted uses, key dimensional standards, where it applies)

Note: the district tables and development standards are in Title 17 (examples below reference the table sections for each district). Always verify the specific parcel zoning and the exact table row. The district names and numeric standards below are taken from the Title 17 development tables: see the RS tables (Table 17.07.030 A/B), Commercial & Mixed Use (Table 17.08.030), Agriculture (Table 17.06.030), Industrial (Table 17.09.030), Waterfront & Harbor (Table 17.11.030), and Public & Semi‑Public (Table 17.10.030). For the full tables see the referenced sections of Title 17.

RS (single‑unit residential) — RS‑A, RS‑B

  • Purpose: neighborhood single‑family housing and lower‑intensity residential development (Chapter 17.07) — see § 17.07.010 and development tables .
  • Typical permitted uses: single‑unit dwellings, accessory structures, limited home occupations, accessory dwelling units (subject to ADU rules) — see Table 17.07.030 A .
  • Key dimensional standards (representative): Maximum height 25 ft, Front setback: 10 ft / 15 ft / 20 ft depending on lot size category, Maximum lot coverage ~45–50% (see Table 17.07.030 A) — consult § 17.07.030 A .
  • Where it applies: detached single‑unit neighborhoods; nonconformities in RS districts are commonly setback or lot‑coverage related (see § 17.26.040.C for residential setback extension rules) .

RL, RM, RH (low‑ to high‑density residential)

  • Purpose: allow increasing density from RL (lower) to RH (higher) and multi‑unit housing — see Table 17.07.030 B and § 17.07.030 .
  • Typical permitted uses: duplexes, small multi‑unit (RM), larger multi‑unit or mixed‑use residential (RH) subject to density caps and design review.
  • Key dimensional standards (representative): Max heights: RL/RM = 25 ft; RH = 30 ft; Front setbacks vary (10–20 ft); Interior side setbacks as low as 3 ft in RL, variable in RM/RH; Lot coverage 45–60% — see Table 17.07.030 B § 17.07.030 B .
  • Where it applies: town neighborhoods, small‑lot infill, and areas where multi‑unit housing is intended. Residential nonconforming additions must follow the residential exceptions (minimum 3‑ft separation from property line for new development within an existing nonconforming interior setback) — see § 17.26.040.C.1 .

AG — Agriculture

  • Purpose & uses: preserve agricultural lands; limited residential and agricultural uses (Table 17.06.030) — § 17.06.030 .
  • Key standards: Minimum lot sizes: 20 or 40 acres in specified areas; Maximum height 25 ft; Setbacks 25 ft typically — see Table 17.06.030 § 17.06.030 .
  • Where it applies: city agricultural lands and specified open areas.

NC / CC / DC / VSC / TMU — Neighborhood Commercial, Community Commercial, Downtown Commercial, Visitor‑Serving Commercial, Transit/Mixed‑Use

  • Purpose: commercial and visitor‑serving uses in appropriate locations; mixed‑use in TMU and overlays — see Table 17.08.030 § 17.08.030 .
  • Typical permitted uses: retail, food & beverage, offices, visitor services; residential above ground floor in some overlays.
  • Key dimensional standards (representative): Max height commonly 25 ft (varies by district); FARs for nonresidential 0.5–1.25; parking and lot coverage rules vary — see Table 17.08.030 § 17.08.030 .
  • Where it applies: commercial corridors, downtown core, visitor nodes. Nonconforming commercial uses face the same restrictions on expansion and repairs in Chapter 17.26; nonresidential structures damaged >50% may lose the nonconforming use right (see § 17.26.050.B.1) .

IG / ICD — Industrial (General & Coastal Dependent)

  • Purpose: industrial, light manufacturing, harbor‑related uses (Table 17.09.030) — § 17.09.030 .
  • Typical permitted uses: warehousing, light industrial, public works and utilities (varies by subclass).
  • Key dimensional standards: Max height ~30 ft, front setbacks often 25 ft, interior/rear may be 0–10 ft depending adjacency to residential — see Table 17.09.030 .
  • Where it applies: industrial zones; when a structure is nonconforming in an industrial area, the 50% repair rule and expansion restrictions apply (Chapter 17.26) .

CF / H / WF — Waterfront & Harbor Area Districts

  • Purpose & uses: coastal‑dependent and harbor activities; waterfront visitor uses (Table 17.11.030) — § 17.11.030 .
  • Typical permitted uses: docks, commercial fishing support, moorage, marine services; some visitor‑serving retail/services with limitations.
  • Key standards: district‑specific use tables and coastal development permit requirements; many waterfront uses require conditional permits and special location rules (see Table 17.11.030) — § 17.11.030 .
  • Where it applies: harbor, Embarcadero, and bayfront. Nonconforming waterfront uses may also be subject to LCP/coastal permit rules; Chapter 17.26 notes that where conflict arises with “redevelopment” for coastal hazards/armoring the redevelopment provisions control — § 17.26.010 .

PF / PR / OS — Public & Semi‑Public / Parks / Open Space

  • Purpose: city facilities, parks, open space with higher setbacks and lower height limits (Table 17.10.030) — § 17.10.030 .
  • Typical uses: government, parks, public recreation; nonconforming privately‑owned structures on public land follow the same Chapter 17.26 rules.

For every district above, see the district specific table in Title 17 for precise numeric standards and permitted uses (examples cited above: Tables 17.06.030; 17.07.030 A/B; 17.08.030; 17.09.030; 17.11.030; 17.10.030) .

Decision‑relevant standards (at a glance)

Rule / Action What the code allows (plain form) Code reference
Continue a lawful pre‑existing use Right to continue but no enlargement, addition, increase in occupant load, or change except as allowed by Chapter 17.26 § 17.26.030
Maintenance & non‑structural repairs Allowed so long as they do not enlarge footprint, height, or roof pitch § 17.26.040.A
Structural repairs (safety) Allowed if immediately necessary to protect public health and cost ≤50% of appraised value § 17.26.040.B
Alterations/additions Allowed only if they comply with code and do not increase the discrepancy (no increase in the nonconformity), with residential setback exceptions § 17.26.040.C
Repair after damage ≤50% Rebuild damaged portions as they were (same size/configuration) § 17.26.050.A
Repair after damage >50% (nonresidential) Nonconforming use must permanently cease; structure must meet current Title 17 § 17.26.050.B.1
Repair after damage >50% (residential ≤3 units) May rebuild up to prior size and unit count, but must comply with current design & development standards; building permits within 1 year § 17.26.050.B.2.a
Expansion / change of nonconforming use Only by Planning Commission with required findings; may impose conditions or term limits § 17.26.060.A
Substitution with another nonconforming use Possible only via conditional use permit and findings; commission may set amortization schedule § 17.26.060.E
Abandonment Use not resumed after 6 months of vacation/utility cutoff/license lapse/lease termination § 17.26.070
Low‑value structure removal Structures valued ≤ $2,500 when became nonconforming must be removed or made conforming within 5 years § 17.26.030.C

Checklist — what an applicant must satisfy (practical)

  • Establish that the use/structure/lot was lawfully established prior to the change in the code or map (e.g., historic permits, certificates, business license) — required by § 17.26.060.A.1.a .
  • If proposing repairs or rebuilding after damage, obtain an appraisal/cost estimate to determine whether the 50% replacement rule applies — see § 17.26.050 .
  • If proposing alteration/addition, demonstrate the work will not increase the nonconformity (no greater setback encroachment, no increased height, etc.) and follow residential exceptions if applicable — § 17.26.040.C .
  • If proposing expansion or substitution of a nonconforming use, prepare a conditional use permit or Planning Commission application showing the required findings (compatibility, no public detriment, consistency with GP/LUP except for the nonconforming use) — § 17.26.060.A .
  • Confirm you have not abandoned the use (no 6‑month vacancy, license lapse, utilities cutoff, or lease termination) — § 17.26.070 .
  • Check whether the work triggers design review or a [coastal development permit] (if in the IP/coastal zone) — see Design Review chapter and Chapter 17.39; design review is required for many exterior changes § 17.38.020 .
  • Verify related standards such as parking, signage, and landscaping; nonconforming signs are governed by Chapter 17.29 — see § 17.26.040.D and Chapter 17.29 .
  • For residential changes consider ADU rules and state ADU protections; local nonconforming zoning cannot be used to unreasonably block ADUs (see local ADU chapter and state law) — see the ADU pages and state ADU law .

Risks & Ambiguities

Issue Why it matters What to verify
Legal establishment of the pre‑existing use If you cannot show the use was lawful when established, the property may be treated as illegal rather than nonconforming Obtain historic permits, business licenses, tax records, prior approvals; consult § 17.26.030
Damage >50% of replacement cost For nonresidential uses this forces cessation of the nonconforming use; for small residential (≤3 units) there is a carve‑out Get a documented cost estimate/appraisal dated to just before damage; see § 17.26.050
What counts as “increase in discrepancy” The standard governs whether an addition is allowed — ambiguous in edge cases (e.g., slight footprint shifts) Show dimensioned drawings comparing existing nonconforming condition vs proposed; reference § 17.26.040.C
Abandonment triggers The six‑month clock may be disputed (e.g., temporary shutdown vs abandonment) Confirm dates of vacancy, license lapses, utility termination, lease end; see § 17.26.070
Coastal/LCP conflicts Coastal program/resilience rules or “redevelopment” provisions can override Chapter 17.26 If in the coastal zone consult Chapter 17.01 and Chapter 17.39; verify whether any redevelopment/coastal hazard rules apply — see § 17.26.010 and IP notes
Low assessed value threshold ($2,500) Old assessed valuations trigger mandatory removal/alteration within a timeline Check assessor records for valuation at the time the structure became nonconforming; see § 17.26.030.C

Plain‑English summary

If your building or use in Morro Bay was legal under an older zoning map or code but no longer meets the rules, you generally may keep using and repairing it — but you cannot enlarge or change it in ways that make the nonconformity worse without specific approval. Small maintenance is allowed; big rebuilds, expansions, or substitutions typically require Planning Commission review or must follow the 50% repair rule or abandonment rules in Chapter 17.26 (read §§ 17.26.030–070) .

Source References

  • Morro Bay Zoning Code (Title 17), Chapter 17.26, Nonconforming Uses, Structures, and Lots — § 17.26.010–070
  • Morro Bay Zoning Code (Title 17), § 17.26.030 (General provisions and low‑value structure rule) — § 17.26.030
  • Morro Bay Zoning Code (Title 17), § 17.26.040 (Maintenance, repairs, additions) — § 17.26.040
  • Morro Bay Zoning Code (Title 17), § 17.26.050 (Repair & replacement after damage) — § 17.26.050
  • Morro Bay Zoning Code (Title 17), § 17.26.060 (Expansions, changes, substitutions) — § 17.26.060
  • Morro Bay Zoning Code (Title 17), § 17.26.070 (Abandonment) — § 17.26.070
  • Development standards and district use tables: Tables for RS (Table 17.07.030 A/B), Commercial (Table 17.08.030), Agriculture (Table 17.06.030), Industrial (Table 17.09.030), Waterfront (Table 17.11.030) — see § 17.07.030, § 17.08.030, § 17.06.030, § 17.09.030, § 17.11.030
  • Design review applicability (exterior changes) — Chapter 17.38 (Design Review)
  • Nonconforming signs — Chapter 17.29 and § 17.26.040.D

Also see these GoCodebook topic pages referenced above:

Information Gaps

  • The uploaded excerpts do not include the full text of Chapter 17.07.010 (purpose language for residential districts) in full‑context — reference to “purpose” is present but full narrative text was not retrieved verbatim. Verify with the jurisdiction if the district purpose wording is needed for discretionary findings. .
  • Parcel‑specific determinations (e.g., historic assessed value at time of nonconformance, exact date when a use became nonconforming) are not in the code and must be verified with city records or the County Assessor. Not found in retrieved materials.
  • Any city fee schedule or form requirements for Planning Commission or CUP applications are not included here — verify with the Community Development Department. Not found in retrieved materials.

Sources

Retrieved passages

  • Morro Bay Zoning Code (Chapter 17.53) High relevance
  • Morro Bay Zoning Code (§ 2) High relevance
  • Morro Bay Zoning Code (§ 2) High relevance
  • Morro Bay Zoning Code (title than) High relevance
  • Morro Bay Zoning Code (chapter establishes) High relevance
  • Morro Bay Zoning Code (title may) High relevance
  • Morro Bay Zoning Code (Section 17.26.070) High relevance
  • CEC § 2 (§ 2) High relevance
  • Morro Bay Zoning Code (Chapter 17.26) Medium relevance
  • Morro Bay Zoning Code (Chapter 17.26) Medium relevance
  • Morro Bay Zoning Code (Chapter 17.26) Medium relevance
  • Morro Bay Zoning Code (§ 2) Medium relevance
  • Morro Bay Zoning Code (Chapter 17.26) Medium relevance
  • Morro Bay Zoning Code (§ 2) Medium relevance
  • Morro Bay Zoning Code (§ 2) Medium relevance
  • Morro Bay Zoning Code (Chapter 17.26) Medium relevance

Cited sections

Frequently asked questions

How does Morro Bay define a nonconforming use or structure?

A nonconforming use, structure, or lot is one that was lawfully established before the effective date of the current Title 17 (or prior amendments) but does not comply with current zoning regulations; the definition and the general right to continue are in § 17.26.030 .

Can I repair a nonconforming building that was partially damaged in a fire?

Yes — if repair/reconstruction costs are ≤ 50% of the replacement cost immediately prior to damage, you may replace damaged portions in the same size/configuration (allowed by right). If the cost exceeds 50%, different rules apply: nonresidential nonconforming uses must cease; certain small residential cases (up to three units) have a carve‑out allowing rebuild subject to current standards and timing rules. See § 17.26.050 .

Can I expand or move a nonconforming business in Morro Bay?

Not as a right. Expansion, relocation, or change of a nonconforming use is prohibited except where the Planning Commission approves it after making required findings that the expansion is legally established, not detrimental to public health/safety/welfare, and consistent with the General Plan/LUP aside from the nonconforming use — see § 17.26.060 .

If a nonconforming use sits vacant for a while, can I restart it later?

No — a nonconforming use that is abandoned or vacated for six months (measured from vacancy or specified events like utility termination or business license lapse) cannot be resumed as a nonconforming use. See § 17.26.070 .

Are there special residential exceptions for additions that encroach into a nonconforming setback?

Yes. In residential districts the code allows maintenance and extension of a nonconforming interior side or rear yard provided new work is at least 3 feet from the property line, does not create a new encroachment into other required yards, and does not increase the height of the portion within the required setback; second‑floor additions must meet current setbacks at application time. See § 17.26.040.C.1 .

What happens if my nonconforming structure had a very low assessed value when it became nonconforming?

If the structure’s assessed valuation was $2,500 or less at the time it became nonconforming, it must be removed or altered to be structurally conforming within five years of becoming nonconforming; the building inspector must give at least one year’s notice before the five‑year compliance date. See § 17.26.030.C .

Do nonconforming signs have special rules?

Yes — lawfully established nonconforming signs may be maintained only in compliance with the sign chapter; the Nonconforming Signs rule and cross‑reference are in § 17.26.040.D and Chapter 17.29 .

Can the Planning Commission require a time limit for an allowed expansion or substitution of a nonconforming use?

Yes — the Planning Commission may impose conditions including a specified term of years for which an expanded nonconforming use is allowed or may establish an amortization schedule when allowing substitution with another nonconforming use via a CUP. See § 17.26.060.A.2 and § 17.26.060.E.1 .

Will coastal rules override the nonconforming provisions?

Potentially. Chapter 17.26 says the chapter’s purpose is to permit continuation provided it does not conflict with the General Plan or the local coastal program; where conflict occurs (for example redevelopment on coastal bluffs or shore armoring), the redevelopment/coastal provisions may apply. See § 17.26.010 .

Does the right to continue a nonconforming use end with a change in ownership?

No — the right to continue attaches to the land and generally survives a change in ownership, except where the use/structure is deemed a public nuisance or has been abandoned as detailed in § 17.26.030 and § 17.26.070 .

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