Local zoning · Colfax

Colfax — Nonconforming Uses

Q: What is a nonconforming use in Colfax?

A nonconforming use in Colfax is a use of land or a structure that does not comply with current Title 17 use rules but was lawful when established; the Code defines these terms in § 17.12.030 , and governs continuance and limits in Chapter 17.100 .

Q: How long can a nonconforming business stay idle before it loses protection?

If a lawful nonconforming use in a building ceases operation for one continuous year , the nonconforming status is terminated; for a nonconforming land use without a building , cessation for 30 days terminates status (§ 17.100.050) .

Q: Can I add on to a nonconforming building in Colfax?

Possibly — additions are allowed only under the tests in § 17.100.060 : for example, if the enlargement conforms to the district rules, or if yards aren’t further reduced and a use permit is approved. Verify setbacks and planning conditions under the district’s development standards and Colfax Development Standards .

Q: If a nonconforming building burns down, can I rebuild it?

If damage exceeds 50% of the appraised value (per assessor records), the property becomes subject to current zoning unless you obtain an administrative permit from the planning director to rebuild and continue the nonconforming use (§ 17.100.080) . Always confirm valuation and get permits first.

Q: If I want to convert a nonconforming commercial use to a less‑intensive use, do I need a permit?

If the nonconforming use is nonresidential , a change to the same or a more restricted use generally requires a use permit (Chapter 17.32 ) per § 17.100.040(A) ; residential nonconforming uses are treated differently and may not require a use permit. Verify the use type under Chapter 17.64 .

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

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Last reviewed: July 1, 2026

Overview

This page explains how Colfax’s zoning ordinance treats nonconforming uses, nonconforming structures, and nonconforming parcels under Title 17 — Zoning. The rules are concentrated in Chapter 17.100 (Nonconforming Uses, Buildings and Structures) and are supplemented by special-use chapters that preserve or terminate legal nonconformity (for example, food service / distribution and large-family day care rules). See the ordinance definitions for the technical meanings of nonconforming use and nonconforming structure at § 17.12.030.

Note: this page covers only what the Colfax zoning ordinance says about nonconforming zoning status and related procedural controls. For building-safety requirements see the California Building Standards Code.

Chapter-by-chapter (citywide) rules — what the Code actually says

The ordinance’s nonconforming rules are adopted in Chapter 17.100. The chapter states the overall purpose (§ 17.100.010) and then sets rules on continuance, changes/extensions, cessation, enlargement/alteration, repairs, destruction, off‑street parking, and nonconforming parcels (see the sections called out below).
Key cross‑references and related nonconforming rules appear elsewhere (examples below): performance standards conversion timeline § 17.120.030, special rules for food service and food distribution nonconformities § 17.144.050 and § 17.148.050, and large family day care rules that treat pre‑existing providers as legal nonconforming uses § 17.160.040.

Important operative rules (plain list, ordinance citations)

Legal nonconforming status may continue for uses or buildings lawfully existing on the ordinance’s trigger dates (examples: July 25, 1967 and August 24, 1967 as called out in the text) — see § 17.100.030 and § 17.100.020.
If a nonconforming building use (nonresidential) is changed, the change may occur only to a use of the same or more restricted nature and generally requires a use permit; residential nonconforming uses can change without a use permit (§ 17.100.040(A)).
A nonconforming use that ceases operation for a continuous period is terminated: for a building use, cessation for one year ends nonconforming status; for a nonconforming land use without a building, cessation for 30 days ends status (§ 17.100.050).
Enlargements or structural alterations of nonconforming buildings are allowed only if they meet one of the limited tests in § 17.100.060 (e.g., the enlargement conforms to zoning; or yards aren’t further reduced and a use permit is secured).
Ordinary repairs and maintenance are allowed but limited: within any 12‑month period, repairs/replacements may not exceed 10% of the current replacement cost unless the planning director or building official approves a larger percent; in no case may the building’s cubic content be increased beyond the nonconforming baseline (§ 17.100.070).
If a lawful nonconforming building is damaged/destroyed to more than 50% of appraised value (per county assessor), then it becomes subject to current zoning unless an administrative permit from the planning director is first secured to rebuild and continue the use (§ 17.100.080).
Nonconforming off‑street parking may remain where a building is reconstructed or altered provided the use is not expanded in a way that would require additional parking under § 17.108.040 (§ 17.100.090). For parking standards see the Colfax Parking page.
A parcel that does not meet current minimum lot standards may still be used as a building site only if it was created by an approved subdivision or has an approved certificate or conditional certificate of compliance (§ 17.100.100).

District-by-district breakdown — how nonconforming rules interact with specific districts (Each district entry lists the district purpose, common permitted uses (per Title 17), key dimensional standards where relevant, and where that district is defined/applied in the Code. These district descriptions are taken from the zoning chapters identified.)

R-1 (Single‑Family Residence)

Purpose: To protect quiet, low density residential neighborhoods and permit single‑family dwellings and necessary civic uses § 17.72.010(A).
Typical permitted uses: Single‑family dwellings, accessory dwelling units, small family day care homes, community services; accessory uses governed in Chapter 17.96 (see table in § 17.72.020).
Key dimensional standards (typical): front setbacks 20–30 ft depending on R‑1 subzone (see the yard table under Chapter 17.72), side yards typically 6–15 ft depending on subzone; maximum height ~ 2½ stories or 30 ft in many residential zones (see Chapter 17.72 notes).
Where it applies / nonconforming interactions: A nonconforming residential use that lawfully existed at the trigger date may continue under § 17.100.030, but changes/extensions of nonresidential nonconforming uses within an R‑1 lot would be governed by § 17.100.040 (use‑permit requirements for nonresidential changes). See Colfax ADUs for accessory dwelling interactions; confirm with the planning director for parcel‑specific questions.

R‑M (Multi‑Family Residence) and R‑MHS (Mobilehome Subdivision)

Purpose: R‑M provides for attached and detached higher‑density housing; R‑MHS is the mobilehome subdivision standard § 17.72.010(B).
Typical permitted uses: multifamily dwellings (with conditional use requirements for some forms), accessory dwelling units, employee housing, certain community care uses § 17.72.020.
Key dimensional standards: R‑M single‑family buildings follow R‑1‑5 numeric standards; site coverage and minimum usable open space differ by subdistrict (see development standards tables in Article IV). Additions > 700 sq ft in some residential zones may require an administrative permit.
Where it applies / nonconforming interactions: Same citywide nonconforming rules apply (Chapter 17.100) — repairs limited by § 17.100.070 and enlargements by § 17.100.060. Design review may modify development standards; see Colfax Design Review.

C‑R (Retail Commercial) and C‑H (Highway Commercial)

Purpose: Establish commercial corridors and retail/service activities (see Chapter 17.76).
Typical permitted uses: retail sales, offices, restaurants, hotels/lodging (permitted or conditional per specific use tables in Chapter 17.76).
Key dimensional standards: maximum heights — C‑R 30 ft, C‑H 35 ft (subject to design review or specific plan changes); commercial setback/lot coverage tables in § 17.76.030.
Where it applies / nonconforming interactions: Nonconforming commercial uses are permitted to continue per § 17.100.030. Changing a nonconforming nonresidential use to a less intense nonconforming commercial use requires a use permit under § 17.100.040(A); expansions that increase demand for parking must comply with parking rules and may not retain nonconforming parking if use expands (see § 17.100.090 and Colfax Parking).

I (Industrial)

Purpose & uses: Light and some heavier industrial uses where permitted; Chapter 17.80 governs development standards.
Key dimensional standards: Industrial districts generally have no area/lot coverage/yard minimums except where abutting other districts; height limited only near adjoining districts § 17.80.030(B–D).
Where it applies / nonconforming interactions: Same Chapter 17.100 rules apply to any industrial nonconforming use or structure. Because industrial districts often have flexible yard rules, verify whether an enlargement triggers a requirement for use permits per § 17.100.060(B–C).

A (Agricultural), OS (Open Space), SPSD (Special Public Service District) and Historic Overlay

Purpose & uses: Agricultural and open space uses are governed in Article III chapters (e.g., 17.68 for Open Space). Overlay rules (historic) add requirements on top of base zoning § 17.84.020.
Nonconforming interactions: Several special‑use chapters (for food service/distribution, day care, etc.) explicitly preserve nonconforming operations but limit how long or under what conditions they may continue; for example, a pre‑existing food service or distribution facility may be a legal nonconforming use but six months’ cessation terminates that status §§ 17.144.050 / 17.148.050. Historic overlay requirements may also affect the ability to alter or rebuild a nonconforming historic building — verify with the planning director and Colfax Historic Preservation.

Decision‑relevant standards at a glance (table)

Topic / Action	What Colfax’s code requires	Code Reference
Definition: “Nonconforming use/structure”	Defined in the Title 17 definitions chapter.	§ 17.12.030
Continue a lawful pre‑existing use	A use/building lawfully existing on the trigger date may continue subject to Chapter 17.100 rules.	§ 17.100.030
Change of nonconforming use (nonresidential)	May change to same or more restricted use only after use permit. Residential changes: no use permit required.	§ 17.100.040(A)
Cessation (termination) — building use	Ceases for 1 year → nonconforming status terminated.	§ 17.100.050(A)
Cessation — land use without building	Ceases 30 days → status terminated.	§ 17.100.050(B)
Enlargement/alteration of nonconforming building	Allowed only under limited tests; may require use permit and cannot reduce existing nonconforming yards § 17.100.060	§ 17.100.060
Repairs/maintenance	Repairs up to 10% of replacement cost per 12‑month period (or more if approved); cubic content may not be increased § 17.100.070	§ 17.100.070
Destruction by calamity	> 50% damage by value triggers conformance unless administrative permit to rebuild is secured § 17.100.080	§ 17.100.080
Nonconforming parking	May remain if no expansion of use requiring additional parking § 17.100.090	§ 17.100.090
Nonconforming parcels	Parcel below lot minimums can be used if created by approved subdivision or has a certificate of compliance § 17.100.100	§ 17.100.100
Special rules (food / distribution / day care)	Pre‑existing operators may be legal nonconforming uses but have explicit stop‑dates/renewal rules (e.g., six months cessation) §§ 17.148.050 / 17.144.050 / 17.160.040	§ 17.148.050 § 17.144.050 § 17.160.040

Checklist

Confirm whether the existing use/structure was lawful on the ordinance trigger date and find the record that proves the pre‑existing status (deed, prior permit, assessor record). Verify with the planning department. (Start with § 17.100.030)
If changing a nonconforming non‑residential use, prepare a use permit application per Chapter 17.32 and confirm required findings for approval (see § 17.100.040(A)).
For expansions/alterations, verify compliance with yard/height/coverage limits in the applicable district (Article IV) and whether a use permit or administrative permit is required (see § 17.100.060). Consult Colfax Development Standards.
For repairs, calculate the replacement cost ratio and confirm it does not exceed 10% in any 12‑month window without director/official approval (§ 17.100.070).
If the structure was damaged >50% of appraised value, file for an administrative permit before rebuilding to preserve nonconforming rights (§ 17.100.080).
If nonconforming off‑street parking is involved, verify that proposed work does not expand the use in a way that requires additional parking under § 17.108.040 and § 17.100.090. See Colfax Parking.
If the parcel does not meet current lot standards, produce evidence of approved subdivision or Certificate/Conditional Certificate of Compliance (see § 17.100.100).

Risks & Ambiguities

Issue	Why it matters	What to verify
Determining the “trigger date” and lawful status	Nonconforming protection attaches to whether the use/structure was lawful on the code’s effective date(s). Errors can invalidate claims of legality.	Confirm records proving lawfulness on the trigger date; consult the planning department. See § 17.100.030.
Whether a change is “residential” vs “nonresidential”	Residential and nonresidential changes are treated differently for the need for a use permit (residential changes may not require a use permit).	Classify the use under Chapter 17.64 use types and follow § 17.100.040(A). Verify with the planning director.
Repair % calculation and approval authority	The 10% limit is a practical cap for repairs; larger work needs director/official approval and can be contested.	Get a current replacement‑cost estimate, document repairs, and obtain written approval if >10% per § 17.100.070.
Damage threshold (50%) valuation disputes	Appraised value used to determine destructiveness; different appraisals can change outcome.	Confirm assessor records and coordinate with the planning director and building official before rebuilding § 17.100.080.
Special‑use exceptions with different cessation periods	Food service/distribution, large day care, and other special chapters impose different cessation/renewal rules (e.g., six months).	Check the specific chapter that governs the use (e.g., § 17.144.050, § 17.148.050, § 17.160.040).
Parcel nonconformance vs project scope	A lot may be nonconforming but still buildable only with proof of prior subdivision or compliance certificate.	Produce subdivision approval or certificate of compliance as required by § 17.100.100.

Plain‑English Summary

If a use or building was lawful before Colfax’s current zoning rules, it can keep operating — but the Code limits how you can change, repair, enlarge, or rebuild it. Small ordinary repairs are allowed, big additions and changes usually require a permit, and long stoppages (30 days for vacant land uses; one year for building uses) generally end nonconforming status. See Chapter 17.100 for the full rules.

Source References

Colfax Municipal Code, Title 17 — Zoning, Chapter 17.100 (Nonconforming Uses, Buildings and Structures): § 17.100.010 through § 17.100.100 (Nonconforming continuance, changes, cessation, enlargement, repairs, destruction, parking, parcels).
Definitions chapter (nonconforming use/structure): § 17.12.030 (Definitions).
Nonconforming rules in special chapters: § 17.144.050 (Food service nonconforming) and § 17.148.050 (Food distribution nonconforming).
Large family day care pre‑existing rules: § 17.160.040.
Performance standards nonconforming timeline: § 17.120.030.
Zoning district purposes and permitted uses (for district summaries): Chapter 17.72 (residential districts) and Chapter 17.76 (commercial), Chapter 17.80 (industrial), Chapter 17.68 (open space), Overlay zones § 17.84.020.
Use/permit rules and processing: Chapter 17.32 (Permit and variance requirements) and Chapter 17.28 (Zoning clearance certification) for procedures and appeals.

Sources

Retrieved passages

Colfax Zoning Code (title for) High relevance
Colfax Zoning Code (Section 17.108.040D.) High relevance
Colfax Zoning Code (chapter provisions.) High relevance
Colfax Zoning Code (chapter shall) High relevance
Colfax Zoning Code (Chapter 17.100) High relevance
Colfax Zoning Code (Chapter 17.44.) High relevance
Colfax Zoning Code (chapter shall) High relevance
Colfax Zoning Code (Chapter 17.108) Medium relevance
Colfax Zoning Code (Chapter 17.128.) Medium relevance
Colfax Zoning Code (Chapter 17.28) Medium relevance
Colfax Zoning Code Medium relevance
Colfax Zoning Code (Chapter 17.128.) Medium relevance
Colfax Zoning Code Medium relevance
Colfax Zoning Code (Chapter 17.12) Medium relevance
Colfax Zoning Code (Chapter 17.164.) Medium relevance
Colfax Zoning Code (title as) Medium relevance

Cited sections

Official Colfax code library

Frequently asked questions

What is a nonconforming use in Colfax?

A nonconforming use in Colfax is a use of land or a structure that does not comply with current Title 17 use rules but was lawful when established; the Code defines these terms in § 17.12.030, and governs continuance and limits in Chapter 17.100.

How long can a nonconforming business stay idle before it loses protection?

If a lawful nonconforming use in a building ceases operation for one continuous year, the nonconforming status is terminated; for a nonconforming land use without a building, cessation for 30 days terminates status (§ 17.100.050).

Can I add on to a nonconforming building in Colfax?

Possibly — additions are allowed only under the tests in § 17.100.060: for example, if the enlargement conforms to the district rules, or if yards aren’t further reduced and a use permit is approved. Verify setbacks and planning conditions under the district’s development standards and Colfax Development Standards.

If a nonconforming building burns down, can I rebuild it?

If damage exceeds 50% of the appraised value (per assessor records), the property becomes subject to current zoning unless you obtain an administrative permit from the planning director to rebuild and continue the nonconforming use (§ 17.100.080). Always confirm valuation and get permits first.

Does ordinary maintenance break nonconforming status?

No — ordinary repairs and replacement of nonbearing elements are allowed, but the Code caps ordinary work to 10% of the current replacement cost in any 12‑month period unless the planning director or chief building official approves a larger percent, and you cannot increase the original cubic content (§ 17.100.070).

What happens if my nonconforming use needs more parking after I alter the building?

Nonconforming parking may remain if the building is reconstructed or altered so long as the use is not expanded in a way that requires additional parking under § 17.108.040; expansions that increase required parking will likely trigger compliance with current parking standards (§ 17.100.090) — check Colfax Parking.

Can a pre‑existing large family day care continue as a nonconforming use?

Yes — large family day care homes that existed and had a valid state license on the ordinance effective date are treated as legal nonconforming uses until the licensing renewal date, but they must apply as required or risk termination; the director can grant limited extensions to comply (§ 17.160.040).

If my parcel is smaller than the current minimum lot size, can I still build?

Potentially. A nonconforming parcel may be used as a building site only if it was created as part of an approved subdivision or has an approved certificate or conditional certificate of compliance (§ 17.100.100). Verify with the planning department and produce documentary evidence.

Do special uses (food distribution, food service) have different nonconforming rules?

Yes. Several special‑use chapters preserve pre‑existing nonconforming operations but set different cessation and alteration thresholds (for example, closure for six consecutive months terminates some nonconforming food facilities). See § 17.148.050 and § 17.144.050 for the details.

If I want to convert a nonconforming commercial use to a less‑intensive use, do I need a permit?

If the nonconforming use is nonresidential, a change to the same or a more restricted use generally requires a use permit (Chapter 17.32) per § 17.100.040(A); residential nonconforming uses are treated differently and may not require a use permit. Verify the use type under Chapter 17.64.

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