Fairfield — Development Standards

Last reviewed: July 2, 2026

Overview

This page summarizes the development-standards rules in the City of Fairfield Zoning Ordinance (Title 25). It focuses on the dimensional and site-development controls—setbacks, heights, lot coverage, density/FAR, and related measurement rules—that govern what you can build in each local zoning district. For procedural topics (permits, building code construction) see the linked pages for Fairfield Zoning, Fairfield Land Use, and the California Building Standards Code.

Key authorities: the ordinance's general development rules (§ 25.20.3), the residential tables (Tables 25‑3, 25‑4, 25‑5, 25‑6), the ADU rules, the density-bonus provisions (§ 25.38), and the measurement rules (§ 25.51). See those sections for the verbatim text and definitions.

How to read this page

• District names and numeric standards are bolded (easier to scan).
• The first natural mention of related topics links to the appropriate local guidance: parking, design review, overlay districts, ADUs, signage, landscaping and screening, and the California Building Standards Code.
• All requirements are grounded in the ordinance text; citations to the controlling § or table appear inline.

District-by-district development standards

Note: detailed numeric standards are collected in discrete ordinance tables. The most relevant “base” regulatory sections are § 25.20.3 (General development regulations and Tables 25‑2 through 25‑6), § 25.20.4 (special development rules including ADUs), and measurement rules in § 25.51.

Residential low-density — RL (example: RL:8)

• Purpose & uses: Intended for low-density single-family neighborhoods; permitted uses follow Table 25‑1 (single-family and accessory uses). See § 25.20.3 for applicability.
• Key dimensional standards: minimum lot area 8,000 sq ft, typical lot width 70 ft (interior), building height limit 35 ft (height increases possible by Conditional Use Permit). These figures are set in Table 25‑3.
• Where it applies: Scattered low‑density neighborhoods and any general‑plan areas mapped as RL; consult the Zoning Map. Verify frontage measurement rules in § 25.51.4.

Residential low/medium — RLM (common suffixes RLM:6, RLM:5, RLM:4.5)

• Purpose & uses: Small‑lot single family and compact subdivisions; allowed uses include detached and attached single family, accessory uses; special small‑lot rules appear in § 25.20.3.2 and Table 25‑5.
• Key dimensional standards (Table 25‑3):
  • RLM:6 — min lot area 6,000 sf; RLM:5 — 5,000 sf; RLM:4.5 — 4,500 sf.
  • Typical lot widths 60/50/45 ft (interior) depending on suffix; front setbacks and garage‑setback rules are in the table notes.
• Where it applies: In medium-density neighborhoods and some planned developments; see Table notes for garage orientation and alley rules.

Residential medium/multifamily — RM, RH, RVH

• Purpose & uses: Multifamily apartments and townhome forms with higher density ranges; permitted uses and unit densities are defined in Table 25‑4 and alternative rules in Table 25‑6.
• Key dimensional standards (Table 25‑4 / 25‑6):
  • Density ranges: RM ~ 10–18 du/ac, RH ~ 19–25 du/ac, RVH ~ 26–40 du/ac (see table headers).
  • Lot coverage: varies; alternative multifamily table sets coverage 50–60% depending on zone.
  • Building height: multifamily ranges often 35–50 ft depending on district and table footnotes; height increases require Conditional Use Permit per § 25.40.6 (see table notes).
• Where it applies: Higher‑density corridors, mixed‑use nodes, and where the General Plan and Zoning Map indicate RM/RH/RVH. See the Density Bonus rules (§ 25.38) for how density/FAR can be increased for qualifying affordable housing.

Commercial / Mixed‑Use — CN, CM, HDC, HD

• Purpose & uses: Neighborhood commercial (CN) and commercial mixed‑use (CM/HDC) districts allow retail, service, office, and where allowed, residential above or behind storefronts. Permitted-use lists are in Table 25‑9 and Table 25‑1 cross‑references; see § 25.20.3 for applicability.
• Key dimensional standards:
  • Setbacks and FAR are generally measured in the tables for each commercial district; downtown/Heart‑of‑Fairfield districts (e.g., HWT, HO, HR) have special front‑setback rules and zero‑setback main‑street standards (see Heart of Fairfield tables).
  • FAR caps in commercial/mixed use tables vary (some entries show 0.6–1.5 FAR in site planning summary).
• Where it applies: Commercial corridors, activity centers, and the Heart of Fairfield plan area; consult the Zoning Map and the Heart of Fairfield tables for street‑specific standards.

Industrial — IBP, IL, IG, ITP

• Purpose & uses: Business parks, light and general industrial uses; uses are listed in industrial tables.
• Key dimensional standards (Table 25‑12):
  • Front/street side setbacks: typically 20–25 ft depending on district.
  • Building height limits: generally 50 ft (some districts like ITP up to 70 ft per table notes).
  • Where industrial abuts residential, additional side/rear setbacks apply (e.g., 25 ft + 1 ft for each ft of height over 35 ft).

Parks / Recreation — REC

• Purpose & uses: Public parks, recreation facilities; development standards are in Table 25‑13. Park site development standards in specific plans reference this table.

Special zones and overlays

• Heart of Fairfield zones (e.g., HWT, HO) have their own table (Table 25‑H5) with tailored front‑setbacks, transparency, and open‑space rules.
• The Hillside Overlay District can alter yard/setback rules (the RLM 4.5 setbacks may be applied inside the Hillside Overlay per table notes). Verify overlay effects on parcel‑by‑parcel basis.
• Overlay rules appear in the ordinance and are referenced in the district tables and notes; consult the City's overlay map and the overlay districts page.

Quick reference table — most decision‑relevant numeric standards

(For exact, parcel‑specific numbers always read the table for the district your parcel is mapped to and the footnotes that apply. Many figures in the ordinance are in tables and their footnotes.)

Development‑rules that commonly matter to applicants

• How height and FAR are measured: see § 25.51 (measuring height, lot coverage, and how to round fractions). Measurements are horizontal distances; lot coverage includes decks over 30 inches; refer to § 25.51.3–4.
• ADUs: subject to specific ADU development standards including max sizes, 16 ft ADU height (with combined garage exception), 4 ft side/rear setback for most ADUs, and waivers to allow an 800 sf ADU where district standards would otherwise prevent it. See the ADU article (ADU rules in the zoning code). Link: ADUs. § 25.20.4.11 and ADU subsections.
• Density Bonus and waiver of development standards: the City implements State density bonus law; a developer can request incentives or waivers to standards (height, setbacks, FAR, parking) under § 25.38 (Density Bonus and Waivers). § 25.38.5–7 specifically cover density bonus and waivers/incentives.
• SB 9 and objective small‑lot standards: SB 9 ministerial duplex/lot-split projects must meet the local objective standards in § 25.20.3.4 (SB 9 Development Regulations).
• Parking and on‑street substitutions: the ordinance allows partial on‑street or off‑site parking credits in some districts (e.g., 50% on‑street allowance within 300 ft and remaining within 750 ft under specific rules). See the parking rules in the district tables and § 25.20 notes. Link: parking.

Checklist — what an applicant must satisfy (minimum)

• Confirm the parcel’s base zoning and any overlay mapping (Hillside, Heart‑of‑Fairfield specific areas) and read the applicable Table (e.g., Table 25‑3, 25‑4, 25‑12). § 25.20.3.
• Verify lot measurements and frontage per § 25.51 (depth, width, coverage definitions).
• Confirm maximum density or permitted dwelling units (or minimum lot area) from the table that governs your district (RL/RLM/RM etc.). § 25.20.3 and Tables 25‑3/25‑4/25‑5.
• Check height, FAR and lot coverage limits in the district table; note Conditional Use Permit options for increased height (§ 25.40.6).
• For ADUs, check § 25.20.4.11 for size, setback, and design rules and the ADU waiver provisions. Link: ADUs.
• Account for parking rules and any on‑street/off‑site credits; consult the parking table and parking.
• Determine whether design review applies and follow design review procedures where required.
• If pursuing density bonus or waivers, follow § 25.38 submittal and incentive procedures.

Risks & Ambiguities

Plain‑English summary

Fairfield’s zoning tables set the concrete yardsticks: which zone your parcel is mapped to (for example RLM:6 or RH) determines minimum lot size or allowed density, front/side/rear setbacks, maximum building height, and lot coverage/FAR — and those numbers are in Tables 25‑3 through 25‑13 of Title 25. Measurement rules (§ 25.51) and special rules for ADUs (§ 25.20.4.11) and density bonuses (§ 25.38) modify how those numbers apply on a real lot, so always check the table footnotes and overlay mapping for your address.

Source References

• Fairfield Zoning Ordinance, General Development Regulations — § 25.20.3 (Tables 25‑2 through 25‑6) and related tables.
• Table 25‑3 (RL and RLM District Development Regulations).
• Table 25‑4 and 25‑6 (Multifamily / Alternative multifamily development regulations).
• Table 25‑12 (Industrial District Development Regulations).
• Heart of Fairfield tables (Table 25‑H5 and Heart plan references).
• ADU development standards and waivers — ADU subsection in the zoning code (ADU rules, e.g., § 25.20.4.11).
• Density bonus and waivers — § 25.38 (Density Bonus).
• Measurement rules (how to measure setbacks, lot coverage, rounding) — § 25.51.
• City planning pages (useful navigation): Fairfield Zoning, Fairfield Land Use, parking, design review, overlay districts, ADUs, California Building Standards Code.

Retrieved passages

• Fairfield Zoning Code (Section 4.A.4) High relevance show source text
• Fairfield Zoning Code (Section 6.4.1) High relevance show source text
• Fairfield Zoning Code (Section 4.A.4) High relevance show source text
• Fairfield Zoning Code (Section 25.40.6) High relevance show source text
• Fairfield Zoning Code (Article VIII) High relevance show source text
• Fairfield Zoning Code (Section 25.51) High relevance show source text
• Fairfield Zoning Code (Section explains) High relevance show source text
• Fairfield Zoning Code (Chapter 5) High relevance show source text

Cited sections

• Fairfield Zoning Ordinance, General Development Regulations — **§ 25.20.3** (Tables 25‑2 through 25‑6) and related tables. (§ 25.20.3)
• Table **25‑3** (RL and RLM District Development Regulations).
• Table **25‑4** and **25‑6** (Multifamily / Alternative multifamily development regulations).
• Table **25‑12** (Industrial District Development Regulations).
• Heart of Fairfield tables (Table 25‑H5 and Heart plan references).
• ADU development standards and waivers — ADU subsection in the zoning code (ADU rules, e.g., **§ 25.20.4.11**). (§ 25.20.4.11)
• Density bonus and waivers — **§ 25.38** (Density Bonus). (§ 25.38)
• Measurement rules (how to measure setbacks, lot coverage, rounding) — **§ 25.51**. (§ 25.51)
• City planning pages (useful navigation): Fairfield Zoning, Fairfield Land Use, parking, design review, overlay districts, ADUs, California Building Standards Code.
• Fairfield_ZoningCode.md

• Official Fairfield code library