Local zoning · Sierra Madre

Sierra Madre — Nonconforming Uses

Nonconforming Uses under the Sierra Madre local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

Sierra Madre regulates nonconforming uses and structures in Chapter 17.56 of the Zoning Code. The chapter lets legally established uses and buildings that no longer meet current zoning continue under strict limits (no enlargement, specific repair/rebuild rules, and automatic termination after abandonment), while providing paths (minor permits, variances) to reduce or eliminate nonconformities over time. See the code statements of purpose and application at § 17.56.010 and § 17.56.020 for the fundamentals .

(First mentions — links)

  • Parking rules are handled in the code and specifically referenced for nonconforming credits under § 17.56.090; see the city's parking rules for detail.
  • Setbacks and other development limits that affect nonconforming structures are in the Development Standards chapter (see setback minima the nonconforming rules allow to remain) .
  • Changes that would reduce a nonconformity often require design review or a minor conditional use permit as described in Chapter 17.60 .
  • If your lot sits in an overlay the overlay rules may interact with nonconformity rights — check overlay districts.
  • The code treats accessory units and their interaction with nonconformities; see the city ADU rules and statewide ADU guidance (state law interacts with rebuild/repair limits). .
  • Structural rebuilds must meet the city's adopted building code (state California Building Standards Code / Title 24) where required.

The Sierra Madre nonconforming-use framework (quick map of key rules)

  • Continuation allowed but no enlargement: a lawful pre-existing nonconforming use may be maintained so long as there is no increase in the area, space, or volume devoted to the use § 17.56.030(A)(1) .
  • Nonconforming structure repairs allowed, but alterations limited: ordinary repair and maintenance are allowed; alteration/enlargement that increases the degree of nonconformity is prohibited unless a variance is obtained § 17.56.030(A)(2), § 17.56.080(E) .
  • Abandonment = automatic loss: a nonconforming use that is discontinued for a continuous 24 months loses protection and cannot be reestablished § 17.56.060(B)(1) .
  • Reconstruction after involuntary damage: limited rebuilding is allowed if documentation is provided, the replacement matches original exterior form, and a building permit is pulled within 24 months § 17.56.070(C)(1) .
  • Minor enlargements/changes to nonconforming uses require a minor conditional use permit and must meet current performance/development standards § 17.56.080(F) .
  • Parking and loading nonconformities are not always treated as nonconforming uses — the code provides specific credits/exemptions and allows a minor CUP for parking shortfalls § 17.56.090(A)-(B) .

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

Note: the nonconforming rules in Chapter 17.56 apply across all zones (§ 17.56.020) but the underlying allowed uses/dimensions differ by zone, which affects what is "nonconforming." Always verify parcel zoning on the official map (the code defaults to R-1 where no zone is shown § 17.04.100) .

R-1 (One-Family Residential)

  • Purpose: Preserve single-family neighborhoods and establish development rules for one-family parcels § 17.20.010–.020. Typical uses and accessory uses are listed in § 17.20.020 (one-family dwellings, home occupations, accessory buildings, small accessory structures, gardens, parks, etc.). § 17.20.020 .
  • Key dimensional standards: setbacks and accessory-structure rules are in Chapter 17.30 (setbacks and lot-area rules referenced back to the R-1 chapter). For accessory structure setbacks and side-yard rules see § 17.30.080 and referenced § 17.30.070 for primary structures; cumulative side-yard rules apply for wider lots § 17.30. .
  • Where it applies: Citywide residential neighborhoods; properties without a zone on the map default to R-1 § 17.04.100 .
  • How nonconformity works here: nonconforming setbacks may be reduced (but not below specified minima) under § 17.56.080(B)(1) (residential setback reduction allowed to at least 10 ft front, 5 ft rear, 3 ft side) and other nonconforming protections in Chapter 17.56 apply .

R-2 (Two-Family Residential)

  • Purpose & uses: Allows duplex/two-family residential development; the R-2 chapter describes permitted and conditional uses (see the R-2 chapter text; multi-family rules for density and special conditions are in Chapters 17.28–17.29 for higher-density zones). See chapter cross-references for conditional uses and design-review requirements § 17.60.030 .
  • Dimensional standards: R-2-specific setback, lot-area, and conversion rules are in its chapter and cross-reference to Chapter 17.30 for accessory structures and setbacks. Nonconforming R-2 uses are specifically preserved per Chapter 17.56 where legally established. Verify R-2 chapter text for parcel-specific minima (noted in the code). Not all R-2 specifics are repeated here; consult the R-2 chapter in the code for exact numbers. Verify with the jurisdiction.

R-3-13 (Medium/High Density Residential)

  • Purpose: Manage medium/high density in locations served by circulation and near downtown § 17.28.010 .
  • Typical permitted uses: dwelling units (tiered density by lot area), one-story accessory buildings, transitional/supportive housing, residential care facilities (≤6), modular homes, family daycare, and ADUs per Chapter 17.22 § 17.28.050–.080 .
  • Key dimensional standards: minimum lot dimensions for newly created lots (e.g., 90 ft width; 140 ft depth; 12,600 sq ft) and tiered unit allowances are in § 17.28.030–.050; design review thresholds and FAR/height rules are in the R-3 chapter § 17.28.030, § 17.28.080 .
  • Where it applies: areas mapped R-3-13, often adjacent to the downtown/commercial core. Legally established R-3 uses that predate current rules may continue indefinitely per § 17.28.020 (see also Chapter 17.56 on nonconformities) .

R-3-20 and R-3-30 (Higher Density Multi-Family)

  • Purpose & uses: Provide for higher density to meet housing needs; permitted uses mirror R-3-13 with exceptions for density/lot size § 17.29.010–.030. Existing nonconforming uses in these zones may continue under Chapter 17.56 § 17.29.020 .
  • Dimensional differences: minimum lot size increases (e.g., new development min 11,000 sq ft), and R-3-20/ R-3-30 have minimum density ranges (20–24 du/ac or 30–34 du/ac respectively) § 17.29.030(B)-(C) .

R-H (Hillside Management)

  • Purpose: Protect hillside natural features, limit grading and set special design/permit procedures § 17.52.010–.020. The zone designation is R-H and its chapter contains hillside-specific rules § 17.52.030 et seq. .
  • Typical permitted uses: home occupations, garage sales, transitional/supportive housing as-of-right; many other activities require administrative or full hillside development permits § 17.52.070(A)-(C) .
  • Key dimensional / special controls: slope-category limitations (no buildings in Slope Category 4 absent strong findings), special setbacks to preserve ridgelines, parking rules, and requirements that development minimize grading and fire/seismic hazards § 17.52.030–.070; § 17.52.100 .
  • Nonconformities: the R-H chapter expressly treats legal pre-existing nonconforming R-H parcels and cross-references Chapter 17.56 for nonconforming rules § 17.52.040–.060 .

C Zone (Commercial)

  • Purpose: Allow commercial activities and compatible uses; development controls and design-review thresholds are in Chapter 17.36 § 17.36.010 et seq. .
  • Typical permitted uses: broad list including retail, office, food services, and residential where allowed; many construction activities trigger design review § 17.36.030–.027 .
  • Key dimensional standards: design review thresholds (height, aggregate floor area, facade changes) and other C-zone property development standards are spelled out in Chapter 17.36 § 17.36.030 .
  • Nonconforming commercial uses: institutional uses present before 1994 are preserved under limited conditions § 17.56.120, and Chapter 17.56 governs continuation, enlargement limits, and reconstruction for nonconforming commercial buildings § 17.56.070–.110 .

Decision-relevant table (quick reference)

Issue / Use What Sierra Madre's code allows / prohibits Code reference
Continue a lawful nonconforming use May be maintained but no enlargement of area/volume without permit/variance (no expansion to new lots) § 17.56.030(A)(1)
Change to conforming use then back Once changed to a conforming use, it cannot revert to nonconforming § 17.56.030(B)
Abandonment / discontinuance If discontinued for 24 continuous months, protection ends and it cannot be reestablished § 17.56.060(B)(1)
Repair/rebuild after involuntary damage (nonresidential) Rebuild allowed if documentation, match original exterior, comply with building code, building permit within 24 months § 17.56.070(C)(1)
Residential rebuild after involuntary damage May rebuild using the same development standards (no GFA expansion) if permit within 24 months and complies with state law (e.g., ADU/other statutes) § 17.56.070(C)(2)
Alteration/enlargement of nonconforming structure Not allowed if it increases the degree of nonconformity unless variance is granted; may also be required to meet current standards § 17.56.080(E)
Reduced residential setback minima (when reducing nonconformity) Allowed if modified setback is at least 10 ft front, 5 ft rear, 3 ft side § 17.56.080(B)(1)
Parking credits for reuse of existing structures Code credits the actual number, last-occupancy requirement, or (for small C-zone uses) the proposed-use standard; minor CUP allowed for parking deficits § 17.56.090(B)

Checklist (what an applicant must satisfy to preserve, repair, or change a nonconforming use)

  • Confirm the use/structure was lawfully established before the controlling ordinance change (not an illegal or unpermitted use). § 17.56.020
  • Document any continuity of operation (receipts, utility records, inventories) if claiming continuous use to avoid abandonment findings. § 17.56.060(B)(3)
  • For reconstruction after involuntary damage: collect proof of involuntary damage and match original footprint/appearance as required; pull a building permit within 24 months and pursue construction to completion. § 17.56.070(C)(1)
  • If proposing alterations/enlargement that could increase nonconformity, apply for a variance or a minor conditional use permit and satisfy findings in Chapter 17.60. § 17.56.080(E), § 17.56.080(F)
  • For parking shortfalls tied to a reuse or addition, prepare a parking justification and consider a minor CUP per § 17.56.090(B)
  • If in a special district (e.g., R-H, overlays), obtain the applicable hillside or overlay permits and meet their specific tests. § 17.52.050–.070

Risks & Ambiguities

Issue Why it matters What to verify
Illegal vs. legal nonconforming uses The nonconforming chapter does not protect illegal or unpermitted uses — they are subject to enforcement § 17.56.020 Verify establishment history and permits; if illegal, permits/abatement rules apply; request records from the Planning/Building Dept.
Abandonment evidence (24‑month rule) If the city determines discontinuance occurred, protection ends automatically § 17.56.060(B)(1) Gather continuous-operation evidence; appeal burden rests with claimant § 17.56.060(B)(4)
Reconstruction timing/documentation Failure to pull permit within 24 months removes the special rebuild rule; replacement must then meet current code § 17.56.070(C)(1–2) Document damage (insurance, fire reports), submit proof with application; confirm building‑permit milestone dates.
Enlargement prohibition vs. adaptive reuse Enlargement or moving that increases nonconformity is barred unless a variance is granted § 17.56.080(E) Verify whether the proposed change increases the nonconformity metric (setbacks, height, lot coverage) and whether findings for variance are achievable.
Parking deficits and ADUs Parking credits and minor CUP options exist but ADU and State ADU law may override local limits in places — interplay can be complex § 17.56.090, state ADU law references Verify parking credits under § 17.56.090, and confirm ADU interaction with state ADU law (state guidance/advice may apply).

Plain-English Summary

If your property in Sierra Madre was legal under old rules but doesn't meet the current zoning, you usually can keep using or repairing it — but you can't expand it or switch it to another nonconforming use; if you stop using it for 24 months, you lose that protection. The controlling rules are in Chapter 17.56 (see § 17.56.030, § 17.56.060, § 17.56.070) and special zone rules (R-1, R-H, R-3, C, etc.) determine the numerical setbacks/lot rules that matter when deciding if a change is an increase in nonconformity .

Source References

  • Sierra Madre Municipal Code, Title 17 — Chapter 17.56, Nonconforming Uses and Structures (purpose, application, restrictions, abatement, repair/reconstruction, alteration rules): § 17.56.010 – § 17.56.140 .
  • R-1 One-Family Residential permitted uses: § 17.20.020 (permitted uses, accessory uses) .
  • R-3-13 Medium/High Density Residential: purpose, permitted uses, legal nonconforming sites: § 17.28.010–.080 .
  • R-3-20 / R-3-30 density rules and development standards: § 17.29.010–.030 .
  • R-H Hillside Management development and permit rules (applicability, slope categories, permit types): § 17.52.030–.070 .
  • C Zone / Chapter 17.36 commercial design-review and construction thresholds: § 17.36.030 (design review triggers), § 17.36.027 (other uses) .
  • Parking credits, exemptions and minor CUP for parking deficits: § 17.56.090 .
  • ADU and state-law interaction (guidance): California ADU guidance / handbook (uploaded resource) — see ADU notes in local code Chapter 17.22 and state ADU guidance (uploaded) .
  • Building-code interactions (when repairs/retrofitting are required to meet adopted codes): see § 17.56.080(D) and the city's adopted building code (Title 24 references). .

Sources

Retrieved passages

  • Sierra Madre Zoning Code (Chapter 17.56) High relevance
  • CBC § 1 (§ 1) High relevance
  • Sierra Madre Zoning Code (§ 1) High relevance
  • Sierra Madre Zoning Code (§ 1) High relevance
  • Sierra Madre Zoning Code (title or) High relevance
  • Sierra Madre Zoning Code (chapter shall) High relevance
  • Sierra Madre Zoning Code (§ 1) High relevance
  • CBC § 1 (Title 24) High relevance
  • CBC § 1 (title and) High relevance
  • CBC § 66314 (§ 66314) Medium relevance
  • Sierra Madre Zoning Code (§ 1) Medium relevance
  • Sierra Madre Zoning Code (§ 7) Medium relevance
  • Sierra Madre Zoning Code (§ 1) Medium relevance
  • Sierra Madre Zoning Code (Section 17.52.070) Medium relevance
  • Sierra Madre Zoning Code (§ 17) Medium relevance
  • Sierra Madre Zoning Code (Section 17.52.060) Medium relevance
  • Sierra Madre Zoning Code (Chapter 17.22.) Medium relevance
  • Sierra Madre Zoning Code (§ 15) Medium relevance
  • CBC § 15 (§ 15) Medium relevance
  • CBC § 15 (§ 15) Medium relevance
  • Sierra Madre Zoning Code (chapter may) Medium relevance
  • Sierra Madre Zoning Code (Section 17.56.120) Medium relevance
  • Sierra Madre Zoning Code (§ 1) Medium relevance
  • Sierra Madre Zoning Code (chapter and) Medium relevance

Cited sections

Frequently asked questions

What counts as a "nonconforming use" in Sierra Madre?

A nonconforming use is a land use or structure that was lawfully established before a zoning change and would now be prohibited or regulated differently; Sierra Madre's local rules are codified in Chapter 17.56, especially § 17.56.010 (purpose) and § 17.56.030 (maintaining and continuing nonconforming uses) .

Can I expand a nonconforming building in Sierra Madre?

No — a nonconforming structure may not be altered or enlarged in a way that increases its nonconformity unless a variance is granted; enlargement must conform to current standards or be approved per § 17.56.080(E) .

If my business stopped operating, can I restart it later and still claim nonconforming status?

If the nonconforming use is discontinued for a continuous period of 24 months, it loses nonconforming protection and cannot be reestablished; see § 17.56.060(B)(1) — so continuous-operation evidence is critical .

My old building was damaged in a fire. Can I rebuild to the same size even if it doesn't meet current setbacks?

Yes, under limited conditions: for involuntary damage the code allows repair/reconstruction to match the original exterior form and dimensions if you provide satisfactory documentation and obtain a building permit within 24 months; otherwise replacement must meet current code § 17.56.070(C)(1–2) .

Do parking shortfalls for an existing nonconforming commercial use automatically force me to upgrade the site?

No. § 17.56.090 credits existing parking by several measures (actual spaces, last-occupying use requirement, or small C-zone rules) and allows a minor conditional use permit for a parking deficit if it won't unreasonably overload local parking. Check § 17.56.090(B) for details .

If I convert a garage to an ADU, does nonconforming-setback status block the ADU?

State ADU law interacts with local nonconformance rules. Sierra Madre's nonconforming rules allow some repair/rebuilds, but state ADU provisions may limit a local agency's ability to deny ADUs because of certain nonconforming zoning conditions. Verify ADU-specific requirements in Chapter 17.22 and the state's ADU guidance; when in doubt, consult the planning director § 17.56.080(C) and ADU guidance.

Does the nonconforming chapter treat parking/Loading and landscaping the same as use nonconformity?

No — § 17.56.090(A) says that nonconformance with loading, parking, screening, planting area, or residential density alone shall not be deemed a nonconforming use for purposes of Chapter 17.56, and special parking-credit rules apply .

How do hillside rules (R-H) affect nonconforming rights?

R-H has its own permit and development standards (slope categories, ridgeline setbacks) and cross-references the nonconforming chapter; legally established nonconforming R-H uses/structures can continue under Chapter 17.56, but R-H special rules (permitting and slope protections) still apply § 17.52.040–.070; § 17.56.020 .

If I get a conditional-use permit for a nonconforming use, can that make it conforming?

A use that now requires a conditional-use approval but was lawfully established may continue; however, if the current code would require a use permit, you cannot enlarge the use without obtaining the required permit — see § 17.56.100(A)-(B) for treatment of uses that were lawful with prior permits and the effect of use permits on nonconforming status .

Who decides disputes about whether a use has been abandoned?

The planning director makes a discontinuance/abandonment determination, but that decision can be appealed to the planning commission; the code lists the types of evidence the director will consider § 17.56.060(B)(3–4) and appeal procedures are in the code (appeal to Planning Commission / City Council as applicable) .

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