Irvine | Inclusionary Housing and Density Bonus

Irvine Inclusionary Housing and Density Bonus: The 15 Percent Rule, Alternatives and Bonuses

Inclusionary housing is a rule that makes new housing projects set aside some homes at prices or rents that lower income households can afford. A density bonus is the extra homes state law lets a project build when it includes affordable homes. Irvine's rules for both are in Chapter 2-3 of the Zoning Ordinance, the "Affordable Housing Implementation Procedure," last amended by Ordinance 25-16 on June 24, 2025. This page reads Supplement 16. The Irvine overview sums up the whole guide.

Who Must Provide Affordable Homes

Section 2-3-2 says the chapter applies "to all residential development proposals, regardless of zoning, within the City of Irvine," and that "the terms 'applicant,' 'application,' 'project,' and 'development' relate only to residential developments of two (2) or more units." Section 2-3-4 then sets the share: "Residential projects shall provide a minimum of 15 percent of their total units as affordable units unless otherwise required by this chapter."

That reach is wide. Read as written, it covers a duplex, a triplex or a small townhome project. Income levels are the state's: extremely low, very low, low and moderate income as defined in the Health and Safety Code and "as established annually by the California State Department of Housing and Community Development." Ask the Planning Division early how it applies the 15 percent rule to a project of two to four homes, where 15 percent is less than one home.

The process is tied to the application. Section 2-3-3 says "No application subject to this section shall be deemed complete without submittal of an affordable housing plan," which the Planning Commission reviews "as part of the entitlement process." The plan states the units, their income levels and locations, how affordability will last, and whether credits or a menu option are used.

The 5-5-5 Split and Credits Within a Project

Source: Irvine Zoning Ordinance Section 2-3-4, Supplement 16.

A credit ratio such as 2:1 means one home counts as two toward the goal. "To the degree ownership units are provided to Very Low income households, a 2:1 credit will be attributed." The combined option lets a project meet both the extremely low or very low and the low income goals with "a minimum of ten percent of the proposed units affordable to Very Low and/or Extremely Low income households," which the code says helps "projects to compete for County affordable housing funds."

By VanPlex arithmetic, a 20-home project needs 3 affordable homes: one at each income level. The units "shall be dispersed within the housing development," their bedroom count "shall be equivalent to the bedroom mix of the market rates," and their design "shall be compatible with the design of the total housing development." Section 2-3-3 sets how long they last: "The minimum period of affordability for a newly constructed or converted affordable unit is 55 years."

Section 2-3-4 E lets the approval body accept other ratios "if the approval authority determines that a proposal will provide equivalent or enhanced affordability." And Section 2-3-5 A.2 says a project "offering to provide affordable housing in excess of the requirements" may only be denied under the Housing Accountability Act, Government Code 65589.5(d).

The Menu Option: Alternatives to On-Site Units

The menu option in Section 2-3-5 B is "an alternative to the on-site affordable housing requirements." It is available only if the City finds on-site units "otherwise infeasible," or that the option "will advance the City's policies and goals related to affordable housing" or "is in the best interests of the City." The code lists four cases the City "will consider" infeasible:

• Development "in the hillside Planning Areas 1, 2, 6, 17, 18, 22, or 27," where costs are higher.
• A rezoning from high, medium or medium-high density to low or estate density that brings low and estate land in the Planning Area to 75 percent or more.
• A Planning Area over 75 percent developed, with no City-approved affordable housing program, whose remaining residential land is zoned estate, low or medium density.
• No financial or processing incentives available "to bridge the gap," shown by a written determination of the Director.

A qualifying applicant may choose one or more "equivalent value" options: convert existing market-rate homes to affordable homes for at least 55 years; extend the affordability of existing affordable homes for 55 years; pay in-lieu fees; transfer units to the City or a nonprofit; use off-site credits; provide alternative housing such as special needs housing or shelters; dedicate land or resources; or another option acceptable to the City.

The In-Lieu Fee and Its 2026 Update

An in-lieu fee is money paid instead of building the affordable homes. Under Section 2-3-5 B.5.c, "The applicant may pay an in-lieu fee, based on the total number of units being developed, as determined by City Council resolution and based on the in-lieu fee formula." The amount "shall be determined at the time building permits are issued," and the money goes to "the city's affordable housing fund."

The City's in-lieu fee update page says the fee, "which is charged per market-rate unit in a residential project, has not been updated since 2011." Staff recommend keeping the existing formula "with updates to the input values to reflect current market conditions." The "May 2026 Draft Affordable Housing and In-Lieu Fee Analysis" was "made available for public review starting August 10, 2026," with a Finance Commission meeting on October 19 and Planning Commission and City Council dates still to be set.

The City's FAQ, dated September 8, 2026, shows the size of the change. One input, a pre-development cost of "$250 per unit," came from the original study, and the update uses "$78,000," which "represents the average predevelopment cost per unit amount identified across all Prototypes." The FAQ says "A 100-unit project with a 15% inclusionary requirement (required by Zoning Ordinance) would pay $4.4 million in fees if no affordable units are provided and the fee option is chosen." These are draft figures; the fee in force is the one in the Council resolution until a new one is adopted.

Affordable Housing Credits

Section 2-3-6 sets up a market in affordable homes. Projects that build "higher percentages of affordable units than are currently required" earn credits that can be "sold or transferred to applicants of other residential projects." The rules:

• "One credit for any income level category shall release 19 dwelling units in a market-rate project or a mixed project with affordable shortfall from their required affordable component for that same income level category."
• For-sale homes "priced for, sold to and occupied by Extremely Low, Very Low, and Low income households shall receive 2.0 credits."
• An agreement signed by the buyer, the seller and the City "must be executed prior to the issuance of building permits."
• Credits become usable once building permits for the extra affordable homes are issued and a bond is posted or occupancy is approved; until then, the buyer pays in-lieu fees, refunded "without interest" when the credits arrive.
• Credits may also be given for "The construction of accessory dwelling units that meet the City's affordability guidelines."

Density Bonus in Irvine

Section 2-3-10 adopts state law: "The City shall grant requests for a density bonus and incentives as set forth in Subsection 2-3-10.D, and in accordance with California Government Code" Sections 65915 to 65918. The application is "processed concurrently with any other application(s)," and "Final approval or disapproval of an application shall be made by the Planning Commission."

Under Government Code 65915, a project with 5 percent very low income homes gets a 20 percent bonus, rising to 50 percent at 15 percent, and "One incentive or concession" for "at least 5 percent for very low income households." The state law covers a "Housing development," defined as "a development project for five or more residential units." Irvine's own 15 percent rule already asks for 5 percent at extremely low or very low income, so a project that meets it can qualify for a state bonus. See the state impact fees page and the duplex to fourplex guide for related state rules.

The bonus units, called "target units," must be built on site "concurrently with market rate units," dispersed, with the same bedroom mix. Rents and prices assume these household sizes:

Source: Irvine Zoning Ordinance Section 2-3-10 C.

A "density bonus housing agreement" is required, and its approval "shall be ministerial as long as all applicable provisions of this Section 2-3-10 are satisfied." It is recorded "prior to final map approval, or, where a map is not being processed, prior to issuance of building permits," with "Tenure of use restrictions for target units of at least 55 years."

Irvine adds two local bonuses. For donated land, Section 2-3-10 G gives "a percentage increase above the otherwise maximum allowable residential density for the entire development equal to one-half of the base density" of the donated land, "up to a maximum combined mandated density increase of 50 percent." The land must be "at least one-half acre in size or of sufficient size to permit development of at least 20 units." For donated resources worth at least the in-lieu fee, Section 2-3-10 H allows "up to 35 percent," in place of the state bonus.

Other Affordable Rules That Touch Small Projects

• SB 9 duplexes and lot splits. Units the owner does not live in "shall be rented as affordable housing to people of very low, low, or median income, as those terms are defined in Chapter 2-3" (Sections 3-42-4 and 3-43-4). See the ADUs and SB 9 page.
• Irvine Business Complex. The RRMU Residential Incentive Program asks for "a minimum of 17% affordability" (7 percent very low, 6 percent low and 4 percent moderate) in exchange for traffic-based building allowances issued "at no cost," and says these levels "are alternative and enhanced to the affordability levels otherwise required by Section 2-3-4."
• Planning Area rules. Some Planning Areas carry their own targets. In Woodbridge, Section 9-15-7 requires that "At least 10 percent of the housing units for sale or rent shall be in a price range affordable to families of moderate income" and that "A minimum of 300 units shall be provided for low-income households."
• Community preference. Section 2-3-11 gives priority to eligible households with an "Irvine Resident" or "Irvine Worker," who works "at least 20 hours per week at a business located within the City of Irvine," to the extent other laws and funding allow.

Fees apply too. Schedule I lists review of affordable housing implementing documents at $217.64 per hour with a $3,000.00 initial deposit, and "Affordable Housing Monitoring" at $59.79. The City's Housing Element page says HCD certified Irvine's 2021-2029 Housing Element on May 24, 2022.

Where Chapter 2-3 Disagrees With Itself

• 30 years or 55 years. Section 2-3-10 D.1 lists a pro forma showing "the economic effect created by the 30-year use and income restrictions" as one way to judge an incentive. Sections 2-3-3 B.2 and 2-3-10 F.4 require at least 55 years. The 55-year rule is the binding term; the 30-year text is part of an evaluation list.
• A wrong cross-reference. Section 2-3-5 B.2.a refers to "Sections 2-34 and 2-3-5.A.1"; the affordable share is in Section 2-3-4.
• A pending change. The zoning update on the September 22, 2026 Council agenda would change "waiting list" to "interest list" in Section 2-3-11 and update income level references across the code.

Where to Go Next

Related on VanPlex: the rent and tenant rules page and the Irvine overview.

Frequently Asked Questions

Official sources (checked October 2026)