Local zoning · Imperial
Imperial — Development Standards
Development Standards under the Imperial local zoning and planning code, with the controlling citations.
Last reviewed: July 6, 2026
Overview
Imperial’s zoning rules live in the City of Imperial Municipal Code Zoning Ordinance, Title 24. Development standards govern where and how structures sit on a lot (setbacks), how tall they can be (height), how much of the lot they can occupy (lot coverage), and in residential zones, how many homes may be built (density). Most zones also require Site Plan Review before construction; coordinate early with design review and check your zoning designation on the City map to confirm which standards apply to your parcel.
Key rule: In Imperial’s residential zones, street setbacks are measured from the ultimate street right‑of‑way, not the existing curb or property line; this can change your measured front yard by several feet (§ 24.03.120.B.1 ).
Residential Districts (Title 24, § 24.03)
RR — Residential Rural
- Purpose and character: Very low-density “rural residential” with agricultural compatibility (§ 24.03 purpose statement ).
- Typical uses: One home on large lots; agricultural/hobby animal uses that fit rural living (plain‑English summary of § 24.03 purpose ).
- Core dimensional standards:
- Density: 0.5–1.0 du/net ac; Lot area: 1 ac minimum; Height: 35 ft or 2 stories max (§ 24.03.120.A ).
- Setbacks: Front 40 ft, Side 20 ft each, Street side 20 ft, Rear 50 ft; Lot coverage: 35% (§ 24.03.120.A ).
- Where it applies: Parcels mapped RR in the City’s zoning; verify on the zoning map.
RL — Residential Low Density
- Purpose and character: Low-density single-family transitional areas, large lots (§ 24.03 purpose statement ).
- Core dimensional standards: Density 2.0 du/net ac; Lot area 20,000 sq ft; Setbacks Front 30 ft, Side 15 ft, Street side 15 ft, Rear 40 ft; Lot coverage 35%; Height 35 ft or 2 stories (§ 24.03.120.A ).
R-1 — Residential Single-Family
- Purpose and character: Conventional single-family neighborhoods (§ 24.03 purpose statement ).
- Core dimensional standards: Density 6.0 du/net ac; Lot area 6,000 sq ft; Setbacks Front 20 ft, Side 5 ft, Street side 10 ft, Rear 10 ft; Lot coverage 50%; Height 35 ft or 2 stories (§ 24.03.120.A ).
RC — Residential Condominium
- Purpose and character: Multi‑unit condominium communities with open space and amenities (§ 24.03 purpose statement ).
- Core dimensional standards: Density 12–20 du/net ac (maximums only if the project exceeds zone and General Plan standards); Lot area 7,500 sq ft; Setbacks Front 20 ft, Side 15 ft, Street side 20 ft, Rear 20 ft; Lot coverage 50%; Height 35 ft or 2 stories (§ 24.03.120.A and note on max density ).
- Adjacency/buffering: When next to any single‑family zone, landscaped buffer 15 ft minimum; multiple street frontages must meet front setbacks on all sides; additional private open space and storage requirements apply (§ 24.03.130.B items 1–5, 7–10 ).
RA — Residential Apartment
- Purpose and character: Higher‑density apartments with enhanced open space and screening (§ 24.03 purpose statement ).
- Core dimensional standards: Density 20–30 du/net ac (maximums only if the project exceeds zone and General Plan standards); Lot area 7,500 sq ft; Setbacks Front 20 ft, Side 10 ft, Street side 20 ft, Rear 10 ft; Lot coverage 60%; Height 35 ft or 2 stories (§ 24.03.120.A and note on max density ).
- Edge‑of‑neighborhood setbacks: Where RC/RA abut single‑family zones, buildings over 15 ft tall must be 50 ft away; buildings ≤15 ft must be 25 ft away (§ 24.03.120.B.7 ).
Residential zone-wide rules you’ll use on every site
- Setback datum: Measure street setbacks from the ultimate right‑of‑way (§ 24.03.120.B.1 ).
- Lot width on cul‑de‑sacs/curves: Must meet the zone’s minimum width at the required front setback (except RC/RA) (§ 24.03.120.B.2 ).
- Flag lots: Meet minimum width at the flag’s terminus; the “flag” strip doesn’t count toward min. lot area (§ 24.03.120.B.3–4 ).
- What counts as coverage: All buildings/structures count; open‑sided patio covers, pools, spas, and freestanding open‑air gazebos/patios do not (§ 24.03.120.B.5 ).
- Accessory structures: At least 5 ft from interior side/rear, and 10 ft from the main structure; certain open canopies/patios may project into yards if they remain open and under 15 ft high (§ 24.03.1240.A–B ).
- Projections and fences: Architectural features may project up to 4 ft; residential fences limited to 36 in solid/ 48 in open in front/street yards; 6 ft max in side/rear yards (§ 24.03.1240.C; § 24.03.150.A–B ).
- Noise: Outdoor acceptable CNEL is 60 dBA in RR/RL/R‑1 and 65 dBA in RC/RA; interior 45 dBA CNEL for all (§ 24.03.130.A.5–6 ).
- Public/semi‑public near single‑family: Maintain 50 ft landscaped setback from any single‑family zone (§ 24.03.120.B.6 ).
- Site Plan Review: Required before any building in R zones (§ 24.03.120, opening paragraph ). Coordinate with design review.
Commercial Districts (Title 24, § 24.05)
C-1 — Neighborhood Commercial
- Purpose and character: Small‑scale retail and services serving nearby neighborhoods (plain‑English summary).
- Core dimensional standards: Front 12 ft, Side 0/10 ft total, Street side 20 ft, Rear 0 ft, Abutting residential 20 ft; Lot coverage 60%; Height 35 ft or 3 stories; Lot width 50 ft, depth 135 ft (§ 24.05.130.A ).
- Site Plan Review and parking: Site Plan Review required; off‑street parking per § 24.13 (§ 24.05.130; § 24.05.130.A.11 ).
C-2 — General Commercial
- Purpose and character: Community‑ and highway‑serving commercial (plain‑English summary).
- Core dimensional standards: Front 12 ft, Side 0/10 ft total, Street side 12 ft, Rear 0 ft, Abutting residential 20 ft; Lot coverage 60%; Height 35 ft or 3 stories; Lot width 60 ft, depth 100 ft (§ 24.05.130.A ).
VC — Village Commercial
- Purpose and character: Pedestrian‑oriented “village” main‑street; mixed‑use envisioned (plain‑English summary).
- Core dimensional standards: Front 0 ft, Side 0 ft, Street side 0 ft, Rear 0 ft; Lot coverage 40%; Lot width 25 ft, depth 100 ft; parking per § 24.13 (§ 24.05.130.A ).
Commercial zone-wide design controls you’ll encounter
- Lighting, screening, storage, utilities, and energy: Shield lighting; screen roof/ground equipment; enclose outdoor storage (≥6 ft opaque); underground utilities where possible; integrate energy‑conserving design (§ 24.05.140.F–L; § 24.05.160.A–B ).
- Accessory structures and fences: No accessory buildings in front or side of the main building; front/street‑yard fences ≤36 in solid/48 in open; 6 ft in interior yards (§ 24.05.150.A–C; § 24.05.160.A–B ).
- Site Plan Review: Required before any C‑zone construction (§ 24.05.130 ).
Industrial Districts (Title 24, § 24.07)
I — Industrial (all I zones)
- Purpose and character: Production, distribution, and related industrial uses with residential edge protections (plain‑English summary).
- Edge and frontage setbacks:
- Where I abuts residential: 15 ft minimum setback (may be used for required off‑street parking) (§ 24.07.130.B.1 ).
- Absolute minimum building setback anywhere in I: 10 ft; average setback may be increased to mitigate impacts (§ 24.07.130.B.2 ).
- Across a street from residential: build a 3‑ft landscaped earthen berm; along shared lines with residential: a 6‑ft high masonry wall plus trees 20 ft o.c. in a 5‑ft raised planter (§ 24.07.130.B.3 ).
- Design/performance:
- Landscape all required setbacks; screen equipment and trash; underground utilities where feasible (§ 24.07.140.A–C ).
- Accessory structure height ≤15 ft; front‑yard placement prohibited (§ 24.07.150.A–D ).
- Industrial fences: 36 in max in required front/side yards; 6 ft in rear/interior side yards (§ 24.07.160.A–B ).
Special Purpose Districts
MHP — Mobile Home Park
- Purpose and character: Planned parks with private drives and shared amenities (plain‑English summary).
- Core standards: Max density 7 du/net ac; Site area 10 ac; Front setback per space 15 ft, Side 5 ft per space; Site street‑side yard 20 ft; Height 14 ft or 1 story; Coverage 55% per space; Recreation area 150–200 sq ft/space; Parking 2 tandem 10’x20’ + 1/4 spaces guest (§ 24.09.130.A–B ; ).
Agricultural Zone
- Purpose and character: Agricultural production with limited residential (plain‑English summary).
- Core standards: 1 dwelling per legal lot/parcel; Lot area 20,000 sq ft; Setbacks Front 30 ft, Side 10 ft, Rear 40 ft; Height 35 ft or 2 stories (agricultural buildings may reach 75 ft with aviation and habitation limits) (§ 24.09.430.B; note on agricultural building exceptions ; ).
- Accessory livestock structures: Min 100 ft from front line and 50 ft from any dwelling/public facility on a contiguous property (§ 24.09.450 ).
O‑S — Open Space
- Purpose and character: Open lands, parks, habitat, and passive/active recreation (plain‑English summary).
- Core standards: 20‑ft minimum setbacks for all buildings; within 50 ft of any public right‑of‑way, height ≤25 ft; beyond 50 ft, no height limit specified; utilities underground unless waived by utility agency (§ 24.20.140.1–4 ).
PUD — Planned Unit Development
- Purpose and character: Master‑planned, mixed‑product neighborhoods with flexible siting (plain‑English summary).
- Core standards: Min area 2 ac; Max density 30 du/ac; Front/side/rear setbacks per approved plan; Accessory buildings ≥3 ft from any lot line; Zero‑lot‑line homes allowed; Height 35 ft or 2 stories; Lot coverage 50%; Open space ~15–20% of project area (adjustable by Commission/Council for superior design) (§ 24.09.262.A–K ; ).
Quick‑view dimensional standards
| District | Density (du/ac) | Front setback | Side setback (each) | Rear setback | Max height | Max lot coverage | Code Reference |
|---|---|---|---|---|---|---|---|
| RR | 0.5–1.0 | 40 ft | 20 ft | 50 ft | 35 ft/2 stories | 35% | § 24.03.120.A |
| RL | 2.0 | 30 ft | 15 ft | 40 ft | 35 ft/2 stories | 35% | § 24.03.120.A |
| R‑1 | 6.0 | 20 ft | 5 ft | 10 ft | 35 ft/2 stories | 50% | § 24.03.120.A |
| RC | 12–20* | 20 ft | 15 ft | 20 ft | 35 ft/2 stories | 50% | § 24.03.120.A |
| RA | 20–30* | 20 ft | 10 ft | 10 ft | 35 ft/2 stories | 60% | § 24.03.120.A |
| C‑1 | N/A | 12 ft | 0/10 ft total | 0 ft | 35 ft/3 stories | 60% | § 24.05.130.A |
| C‑2 | N/A | 12 ft | 0/10 ft total | 0 ft | 35 ft/3 stories | 60% | § 24.05.130.A |
| VC | N/A | 0 ft | 0 ft | 0 ft | — | 40% | § 24.05.130.A |
| I (edge to R) | — | — | — | — | — | — | 15‑ft min setback where abutting R; 3‑ft berm and 6‑ft wall per adjacency |
| MHP | 7.0 | 15 ft/space | 5 ft/space | — | 14 ft/1 story | 55%/space | § 24.09.130.A |
| Agricultural | 1 dwell./lot | 30 ft | 10 ft | 40 ft | 35 ft/2 stories (75‑ft ag exceptions) | — | § 24.09.430.B; note* ; |
*RC/RA density at the maximum is approvable only if the project exceeds zone and General Plan standards; above‑minimum density requires Planning Commission and City Council approval (§ 24.03.120.A note ).
Related citywide requirements to keep in view
- Off‑street parking: apply § 24.13 for all zones that reference it (e.g., C zones; MHP) (§ 24.05.130.A.11; § 24.09.440 ; ).
- Fences/walls vary by zone; see the residential, commercial, and industrial fence sections cited above, and landscaping and screening.
- Signs in O‑S require Planning Commission approval; for all others, see signage rules (§ 24.20.140.5 ).
- Nonconforming situations are handled under nonconforming uses; relief routes are under variances and exceptions.
- Accessory Dwelling Units follow state law and local standards distinct from the “second unit” notes in older sections; see Imperial ADUs and California ADU law. Do not confuse zoning with the California Building Standards Code.
Checklist
- Confirm your parcel’s base district and any overlay.
- Verify which front line applies (existing vs. ultimate right‑of‑way) before staking setbacks (§ 24.03.120.B.1 ).
- Check zone‑specific setbacks, height, lot coverage, and (for residential) density limits in the tables above.
- If abutting or facing residential from a C or I site, apply required buffers (setback, berm/wall, landscaping) (§ 24.05.130.A; § 24.07.130.B.1–3 ; ).
- Confirm what counts toward lot coverage for your proposal (§ 24.03.120.B.5 ).
- Apply accessory‑structure placement limits and projection rules (§ 24.03.1240; § 24.05.150; § 24.07.150 ; ; ).
- Prepare for Site Plan Review in R and C districts; align with parking, screening, lighting, and utility screening standards (§ 24.03.120; § 24.05.130; § 24.05.140 ; ; ).
- For RC/RA near R‑1, maintain increased setbacks and landscaped buffers (§ 24.03.120.B.6–7; § 24.03.130.B.1–3 ; ).
Risks & Ambiguities
| Issue | Why it matters | What to verify |
|---|---|---|
| Measuring setbacks from ultimate right‑of‑way | Using the wrong datum can push buildings into a violation | Confirm ROW widths with Public Works; apply § 24.03.120.B.1 |
| RC/RA adjacency to single‑family | Tall buildings must step back substantially | Show 50 ft or 25 ft separation as applicable; add 15 ft landscaping (§ 24.03.120.B.7; § 24.03.130.B.3 ; ) |
| Industrial buffers facing/abutting R | Missing berms/walls/trees delay approvals | Provide berm, 6‑ft wall, and planter‑trees 20 ft o.c. (§ 24.07.130.B.3 ) |
| What counts as lot coverage | Patio covers and pools are excluded, others are not | Apply § 24.03.120.B.5 to your site plan |
| FAR standards | Some cities cap floor area; Imperial materials here do not | Not found in retrieved materials |
| Corner/interior lot width/depth for RC/RA | Table formatting makes some width/depth splits unclear | Verify with the jurisdiction based on § 24.03.120.A |
| O‑S heights beyond 50 ft from ROW | “No height limits” could conflict with airport/overlay constraints | Check overlay districts; confirm with Planning (§ 24.20.140.3 ) |
| ADUs vs. older “second unit” rules | State law preempts older caps; local standards vary | Use Imperial ADUs and state law pages; ignore superseded caps |
Plain-English Summary
Imperial’s development standards tell you how far back to place buildings, how tall and wide they can be, and how much you can build on a lot. Residential neighborhoods step from big lots in RR/RL down to typical R‑1 lots, then to RC/RA apartments with added buffering near houses. Commercial and industrial sites have tight urban setbacks but must protect neighbors with berms, walls, landscaping, and screened equipment. Always confirm the right‑of‑way line first, then lay out setbacks, parking, walls, and open spaces to match the numbers above—and run your plan through design review early.
Source References
- § 24.03.120 Property Development Standards: R Zones (tables; measurement rules)
- § 24.03.120.B.1–7 Special Requirements (ROW datum; cul‑de‑sacs; flag lots; coverage; RC/RA adjacency)
- § 24.03.1240 Accessory Structures: R Zones (setbacks; projections)
- § 24.03.130 Performance Standards: R Zones (noise; RC/RA landscaping/open space/storage/recreation) ;
- § 24.05.130 Property Development Standards: C Zones (C‑1/C‑2/VC tables; Site Plan Review)
- § 24.05.140–160 Commercial design, screening, accessory structures, and fences
- § 24.07.130–160 Industrial setbacks, performance/screening, accessory structures, fences ;
- § 24.09.130 Property Development Standards: MHP Zone (park/site/space standards) ;
- § 24.09.430–460 Agricultural standards, parking, accessory livestock structures, fences ;
- § 24.20.140 O‑S Open Space development standards (setbacks; height; utilities)
- § 24.09.262 PUD Property Development Standards (area; setbacks by plan; coverage; height; open space)
Information Gaps
- Floor Area Ratio (FAR) standards: Not found in retrieved materials.
- Exact interior vs. corner lot width/depth splits for RC/RA due to table formatting: Verify with the jurisdiction.
Sources
Retrieved passages
- Imperial Zoning Code High relevance
- Imperial Zoning Code (Section 3.) High relevance
- Imperial Zoning Code High relevance
- Imperial Zoning Code High relevance
- CBC § 24.03.110 (Section 24.03.110A) High relevance
- Imperial Zoning Code (Section 24.03.120) High relevance
- Imperial Zoning Code High relevance
- Imperial Zoning Code (Section 24.03.110A) High relevance
Cited sections
- § 24.03.120 Property Development Standards: R Zones (tables; measurement rules) (§ 24.03.120)
- § 24.03.120.B.1–7 Special Requirements (ROW datum; cul‑de‑sacs; flag lots; coverage; RC/RA adjacency) (§ 24.03.120.B.1)
- § 24.03.1240 Accessory Structures: R Zones (setbacks; projections) (§ 24.03.1240)
- § 24.03.130 Performance Standards: R Zones (noise; RC/RA landscaping/open space/storage/recreation) (§ 24.03.130)
- § 24.05.130 Property Development Standards: C Zones (C‑1/C‑2/VC tables; Site Plan Review) (§ 24.05.130)
- § 24.05.140–160 Commercial design, screening, accessory structures, and fences (§ 24.05.140)
- § 24.07.130–160 Industrial setbacks, performance/screening, accessory structures, fences (§ 24.07.130)
- § 24.09.130 Property Development Standards: MHP Zone (park/site/space standards) (§ 24.09.130)
- § 24.09.430–460 Agricultural standards, parking, accessory livestock structures, fences (§ 24.09.430)
- § 24.20.140 O‑S Open Space development standards (setbacks; height; utilities) (§ 24.20.140)
- § 24.09.262 PUD Property Development Standards (area; setbacks by plan; coverage; height; open space) (§ 24.09.262)
- Imperial_ZoningCode.md
Frequently asked questions
What can I build on an R-1 lot in Imperial?
Typically, a single-family home with customary accessory structures is allowed. Key limits are a 20 ft front setback, 5 ft side setbacks, 10 ft rear, 50% lot coverage, and 35 ft/2 stories max height (§ 24.03.120.A ). Check accessory‑structure placement and projection rules before adding sheds or patio covers (§ 24.03.1240 ).
What are the R‑1 setback requirements?
For R‑1, plan on Front 20 ft, Side 5 ft, Street side 10 ft, and Rear 10 ft (§ 24.03.120.A ). Remember that front setbacks in R zones are measured from the ultimate right‑of‑way, not the current curb (§ 24.03.120.B.1 ).
How tall can I build in Imperial’s residential zones?
All listed residential districts cap height at 35 ft or 2 stories, whichever is less (§ 24.03.120.A ). In RC/RA next to single‑family zones, additional building setbacks apply when structures exceed 15 ft (§ 24.03.120.B.7 ).
Do commercial buildings have front setbacks?
Yes. C‑1 and C‑2 require 12 ft front setbacks; VC has a 0 ft front build‑to (main‑street character) (§ 24.05.130.A ). Where commercial sites abut residential, keep 20 ft on the side/rear (§ 24.05.130.A ).
What buffering is required for industrial sites near homes?
Where an industrial lot abuts residential, provide at least a 15 ft setback (parking may occupy it) and, across from residential, build a 3‑ft landscaped berm; along shared edges, build a 6‑ft masonry wall and add trees 20 ft on center in a 5‑ft planter (§ 24.07.130.B.1–3 ).
Are there FAR limits in Imperial?
No Floor Area Ratio caps appear in the retrieved materials. Projects are controlled by setbacks, height, and lot coverage; verify any FAR with the City. Not found in retrieved materials.
What’s the height rule in the O‑S Open Space zone?
Buildings within 50 ft of a public right‑of‑way are limited to 25 ft; beyond 50 ft, no height limit is specified (§ 24.20.140.3 ). Utilities must be underground unless the utility agency won’t allow it (§ 24.20.140.4 ).
How are fences handled in neighborhoods?
In R zones, front/street‑side fences can be up to 36 in solid or 48 in open; interior side/rear can be 6 ft (§ 24.03.150.A–B ). Similar front‑yard height limits exist in C and I zones (§ 24.05.160.A; § 24.07.160.A ; ).
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