The District evaluates mitigation amounts periodically (approximately every two years).  Mitigation amounts are determined based on studies that include demographic data, State Allocation Board information, and a statistical analysis of projected impacts of future development on the District.

If the addition is less than 500 square feet, no mitigation amounts are owed. If the addition is 500 square feet or more, mitigation amounts are owed for the entire addition.  For example, if the addition is 750 square feet, mitigation amounts are owed on the full 750 square feet.  If the square footage is 499 or less, no mitigation amounts are owed. If you are converting "unlivable" space (such as a garage or basement) into livable space that is more than 500 square feet, this qualifies for fees.

You must still complete an application with the District even when the addition is less than 500 square feet so the District can issue a certificate showing the addition is exempt. This includes ADUs and conversions of non-livable space, such as, but not limited to, garages and basements.

 Under California Government Code section 65995 and Education Code section 17620, the District is authorized to impose school impact fees on “assessable space” (rather than merely “habitable space”) for residential construction projects.  Residential “assessable space” is defined as “all of the square footage within the perimeter of a residential structure, not including any carport, covered or uncovered walkway, garage, overhang, patio, enclosed patio, detached accessory structure, or similar area.”  (Gov. Code, §65995(b)(1) [emphasis added].)  Assessable space also includes the square footage of enclosed walkways, such as hallways inside the perimeter of a residential structure.  (Assem. Bill No. 715 (2015-2016 reg. Sess.) Assem. Floor Analysis, June 26, 2015.)    While it is true that residential space used to be defined as “habitable” space, the California Legislature changed the definition to “assessable” space in 1989 to clarify that residential space typically characterized as “non-habitable” is also subject to school impact fees. 

Your argument that “only habitable area results in impacts to the school districts” was expressly rejected by the California Court of Appeal in in Victoria Groves Five v. Chaffey Joint Union High Sch. Dist. (1990) 225 Cal.App.3d 1548, 1553-1554 [school district was allowed to impose school impact fees on new residential development space without regard to whether such space was “habitable.”])  Furthermore, in 2018, the California Court of Appeal directly addressed and resolved the issue as to whether interior common areas, i.e., amenity square footage, in multi-family residential projects is “assessable space” subject to school impact fees, and held: “Apartment structures and single-family homes are treated equally.  All interior space is assessable.  It does not matter that some interior spaces are individually owned, whereas others are common area.  All interior space is treated the same.” (1901 First Street Owner, LLC v. Tustin Unified School District (2018) 21 Cal.App.5th 1186, 1193.)

In other words, pursuant to the holdings in 1901 First Street Owner and Victoria Groves Five, and the statutory authority under Education Code section 17620 and Government Code 65995, all interior space within a residential development is properly assessable for developer fees at residential rates, regardless of whether such space is located within individual dwelling units or in separate community buildings or spaces. When amenities are provided for resident use, such spaces are an essential component of the residential product you are delivering to residents.

Accordingly, the amenity spaces, as well as utility spaces, mechanical rooms, stairwells, etc., are subject to residential fees.

Yes, mitigation amounts apply even if you have no children because there will be an impact on the District if you sell to someone with children.