Colton — Historic Preservation

Last reviewed: July 1, 2026

Overview

This page summarizes how the City of Colton's zoning code treats historic resources, historic-district‑style regulation, and review requirements that affect projects in the downtown/historic area and residences listed on the City Register. It interprets what the code requires (where the code speaks to historic resources) and flags what the local ordinance does not specify. For project-level questions, verify with the City—some procedures (designation of landmarks, the City Register, and demolition reviews) were not located in the retrieved Zoning Code excerpts.

What the code says (plain-English synthesis)

• Colton explicitly protects its historic downtown form through the Mixed‑Use Downtown (M‑U/D) and General Commercial—Downtown overlay (C‑2/D) rules and requires consistency with the Colton Downtown Design Manual when developing in downtown. See § 18.23.010, § 18.23.4.010, and § 18.23.130 for intent and guidance . Use the city's downtown guidance when preparing design and site plans and coordinate with the design‑review authority (Chapter 18.58) for required approvals .
• The Zoning Code treats residential properties that are on the City Register of Historic and Scenic Resources differently for certain uses: Home occupations in registered historic residences have special limits intended to preserve the principal character of the dwelling (e.g., no non‑family employees, no exterior alteration/recognizable commercial appearance, restricted hours for accessory retail) — see § 18.44.040 .
• The City will not grant waivers, concessions, or reductions of development standards that would cause an adverse impact on properties listed in the California Register of Historical Resources or the City’s list of historic landmark properties; this limit is explicitly invoked as part of density bonus/incentive rules and concessions (§ 18.59.040 and related subsections) .
• Design review and architectural compatibility criteria require that exterior design not be injurious to environmental or historic features of the immediate neighborhood; design review triggers and findings are listed in multiple chapters (design review rules appear throughout the Title and are enforced via Chapter 18.58) — see § 18.14.220, § 18.14.230 and the design‑review directions in the downtown/mixed‑use chapters .
• The Downtown overlay zones explicitly require development to complement the historic character and refer projects to the Colton Downtown Design Manual for mandatory consistency § 18.23.130 .

Links you may need while reading: the code treats design and site decisions under the City’s design‑review process (see design review), and downtown work must follow the Colton Downtown Design Manual. Practical project topics such as parking, development standards, overlay districts, and ADUs interact with historic protections and are linked for cross‑reference below in the text. Use the links when preparing submittals: Colton Design Review, Colton Parking, Colton Development Standards, Colton Overlay Districts, and Colton ADUs. If work touches building‑code issues (Title 24), refer to the California Building Standards Code.

District-by-district breakdown (how the code treats historic resources in specific districts)

Mixed‑Use Downtown — M‑U/D

• Purpose: Encourage civic, commercial, office and residential uses while preserving long‑established, low‑density residential pockets and the area's historic character. See § 18.23.010 .
• Typical permitted uses: Mixed commercial/residential (refer to Table F / § 18.06.060 for the full use list) .
• Key design review and development controls:
  • Architectural and site plan review is required for all development (decision body per Chapter 18.58) and reviews must consider pedestrian orientation and compatibility with the historic character (see § 18.23.2.060 and § 18.23.120) .
  • Development standards (lot size, setbacks, building height, FAR) are in Table 18.23.050‑1 (see § 18.23.050) — downtown standards favor zero or very shallow front setbacks to preserve street‑face continuity .
• Where it applies: downtown area as shown on the Official Zoning Map and in the Downtown chapters; downtown projects must be consistent with the Colton Downtown Design Manual § 18.23.130 .

General Commercial—Downtown overlay — C‑2/D

• Purpose: Guide physical form and a wide range of retail and service uses in Colton’s Historic Downtown; the overlay directs compatibility with the Downtown Design Manual § 18.23.4.010 .
• Typical permitted uses: Retail, office, professional services (see Table F / § 18.06.060) .
• Key dimensional standards: Table 18.23.4.050‑1 sets lot minimums and building heights (generally 3 stories / 40–45 ft, plazas and shallow front setbacks permitted; front setback maximum 10 ft with exceptions for plazas) — see § 18.23.4.050‑1 and § 18.23.4.050 .
• Historic focus: Downtown overlay explicitly ties form and design to historic downtown objectives; design review and Downtown Manual consistency are mandatory § 18.23.4.130 .

Residential zones (example: R‑1, R‑3/R‑4 as relevant)

• Purpose: Residential districts preserve neighborhood form and compatibility. The Zoning Code’s allowed uses and special provisions apply via the use tables and Chapter 18.06.060 .
• Historic resource-specific rule: Home occupations located in dwellings that are on the City Register of Historic and Scenic Resources are subject to the special criteria in § 18.44.040 (no non‑family employees, no exterior alterations that change appearance, restricted hours for accessory retail, etc.) .
• Typical development standards (setbacks, heights, lot coverage): those are contained in the district development tables and specific chapter tables (e.g., R‑zone tables in the Title) — consult the relevant district table in § 18.06.060 and the district chapter for precise numeric standards (not all numeric R‑zone standards were found in the retrieved excerpts) .

Quick reference table — decision‑relevant items

Practical guidance and interpretation

• If your property is in the downtown plan area or labeled M‑U/D or C‑2/D, plan on mandatory design review and prepare to demonstrate consistency with the Colton Downtown Design Manual and the downtown lot/building standards § 18.23.120 / § 18.23.130 .
• If the property is on the City Register of Historic and Scenic Resources (or listed on the California Register), expect limits on changes that affect exterior appearance, signage, and commercial character; special home‑occupation rules apply § 18.44.040 .
• Requests for reductions of development standards (density bonus concessions, setback/height waivers) will be scrutinized if they could harm historic properties; the code explicitly prevents concessions that would have an adverse impact on City‑designated historic landmarks or California Register properties § 18.59.040 .
• For ADUs: local code excerpts provided do not set out a historic‑resource‑specific ADU procedure; state ADU law allows objective standards to prevent adverse impacts to resources on the California Register. Local ADU rules should be checked in Colton’s ADU chapter and with staff — see Colton ADUs and state guidance (uploaded ADU handbook) .

Checklist (what an applicant must satisfy for a project affecting historic resources)

• Confirm whether property is on the City Register of Historic and Scenic Resources (verify with staff). (Not found in retrieved materials; verify with the jurisdiction.)
• If in M‑U/D or C‑2/D, prepare project for Architectural & Site Plan Review and a narrative showing consistency with the Colton Downtown Design Manual § 18.23.120, § 18.23.130 .
• For residential historic properties, ensure home‑occupation/submitted use follows § 18.44.040 limits (no exterior changes that alter character; no non‑family employees; restricted hours for accessory retail) .
• Demonstrate the project will not cause an “adverse impact” on City or California‑registered historic properties when seeking waivers/incentives (particularly for density bonuses) § 18.59.040 .
• Prepare required site plans/elevations, parking plans (see Colton Parking), and the design packet required by Chapter 18.58 (design‑review submittal checklist) .
• Expect environmental review coordination (CEQA) where historic resources may be affected; the Director handles determination of the appropriate environmental document § 18.01.030 and related application procedures .

Risks & Ambiguities

Plain-English Summary

If you own or want to change a building in Colton’s historic downtown or a residence listed on the City Register, expect mandatory design review and stricter limits on exterior changes: downtown projects must follow the Downtown Design Manual and registered historic homes have special rules for home occupations and exterior modifications. The City will deny waivers or concessions that would harm City or California‑listed historic properties—so check whether your property is on the City Register and coordinate early with Planning. See § 18.23.010, § 18.23.4.010, § 18.23.130, § 18.44.040, and § 18.59.040 for the controlling code language .

Source References

• City of Colton Zoning Code (Title 18) — Downtown overlay and mixed‑use downtown intent and standards: § 18.23.010, § 18.23.2.060, § 18.23.120, § 18.23.130 .
• Home occupations and City Register historic‑resource criteria: § 18.44.040 (Chapter 18.44 — Home Occupations) .
• Design/architectural compatibility and design review triggers: § 18.14.220, § 18.14.230, Chapter 18.58 (design review referenced throughout) .
• Use tables and where to find permitted uses for zones: § 18.06.060 (use tables) .
• Density bonus and waiver/concession limits with historic‑impact language: § 18.59.040 (waiver/reduction and adverse impact language) .
• Downtown overlay property development standards and Downtown Design Manual requirement: § 18.23.4.050‑1, § 18.23.4.130 .
• State ADU guidance (uploaded handbook used for context; local ADU procedures should be checked with the City): 2025 California ADU handbook (uploaded) .

Retrieved passages

• Colton Zoning Code (§ 14) Medium relevance show source text
• Colton Zoning Code (Title as) Medium relevance show source text
• Colton Zoning Code (title for) Medium relevance show source text
• Colton Zoning Code (§ 1) Medium relevance show source text
• Colton Zoning Code (§ 65589.5) Medium relevance show source text
• Colton Zoning Code (§ 1) Medium relevance show source text
• Colton Zoning Code (§ 1) Medium relevance show source text
• Colton Zoning Code (Chapter 18.36.) Medium relevance show source text
• Colton Zoning Code (§ 1) Medium relevance show source text
• Colton Zoning Code (Chapter 18.58.) Medium relevance show source text
• Colton Zoning Code (§ 2) Medium relevance show source text
• Colton Zoning Code (Section 16.20.020) Medium relevance show source text
• Colton Zoning Code (Title 18) Medium relevance show source text
• Colton Zoning Code (§ 65915) Medium relevance show source text
• CBC § 18955 (Section 18955) Medium relevance show source text
• Colton Zoning Code (Chapter 18.35.1) Medium relevance show source text

Cited sections

• City of Colton Zoning Code (Title 18) — Downtown overlay and mixed‑use downtown intent and standards: **§ 18.23.010**, **§ 18.23.2.060**, **§ 18.23.120**, **§ 18.23.130** . (Title 18)
• Home occupations and City Register historic‑resource criteria: **§ 18.44.040** (Chapter 18.44 — Home Occupations) . (§ 18.44.040)
• Design/architectural compatibility and design review triggers: **§ 18.14.220**, **§ 18.14.230**, Chapter **18.58** (design review referenced throughout) . (§ 18.14.220)
• Use tables and where to find permitted uses for zones: **§ 18.06.060** (use tables) . (§ 18.06.060)
• Density bonus and waiver/concession limits with historic‑impact language: **§ 18.59.040** (waiver/reduction and adverse impact language) . (§ 18.59.040)
• Downtown overlay property development standards and Downtown Design Manual requirement: **§ 18.23.4.050‑1**, **§ 18.23.4.130** . (§ 18.23.4.050)
• State ADU guidance (uploaded handbook used for context; local ADU procedures should be checked with the City): 2025 California ADU handbook (uploaded) .
• Colton_ZoningCode.md
• 2025 California ADU handbook.md
• 2025 California Building Code.md

• Official Colton code library