Mill Valley affordable units in new housing (inclusionary)

Each rule below links to the section of the Mill Valley Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What Mill Valley's code says

Mill Valley code What Mill Valley's code adds
Exemptions	Exempt: renovations and additions to existing homes costing less than the construction valuation threshold. Applies: The threshold is $100,000 initially, adjusted annually. § 20.80.050 · code text Existing residences that are altered, improved, restored, repaired or expanded are exempt, provided that the construction valuation for the project is less than the construction valuation threshold, adjusted annually in accordance with Section 20.80.070. Exempt: accessory dwelling units. § 20.80.050 · code text Accessory dwelling units, constructed pursuant to Chapter 20.90. Exempt: multi-family efficiency units, also called microapartment units or micro-units. § 20.80.050 · code text Multi-family efficiency units (also referred to as "microapartment units" or "micro-units"), as further defined in Sections 20.08.070(B) and 20.24.040(B). Exempt: single-family and multi-family projects below the construction valuation threshold. Applies: The threshold is $100,000 initially, adjusted annually. § 20.80.030 · code text Residential Development less than $100,000* \| Single family and multi-family residential development projects less than the construction valuation threshold. \| Exempt
Fee instead of units	A percentage of the construction valuation, set by City Council resolution. Applies: Impact fee at or above $100,000 for single-family projects and multi-family or mixed-use projects up to 3 new units; larger projects may pay it instead. § 20.80.050 · code text The impact fee shall be calculated based on a percentage of the construction valuation, as established by City Council resolution.
Projects it applies to	Four or more new or replacement units. Applies: Multi-family and mixed-use ownership projects must build affordable units. § 20.80.050 · code text Multi-family and mixed use ownership projects of four or more units shall construct affordable housing unit(s) as follows: $100,000 construction valuation, adjusted annually. Applies: Projects at or above this value are subject to the chapter (impact fee, or affordable units for 4 or more new units). § 20.80.050 · code text Applicable projects are based on those projects equal to or exceeding the construction valuation threshold, initially established at $100,000.00, adjusted annually in accordance with Section 20.80.070.
Share of affordable units	At least 25% of units. Applies: Ownership multi-family and mixed-use projects creating four or more new units; for moderate and low income households. § 20.80.050 · code text At least 25% of the total number of dwelling units within a project that creates four or more new units shall be made available to moderate and low income households. At least 50% of the affordable units. Applies: Rented or sold to low income households; ownership projects creating four or more new units. § 20.80.050 · code text Of these designated affordable units, at least 50% shall be rented or sold to low income households.

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Frequently asked questions

Does Mill Valley require affordable units in new housing?

Mill Valley's code: Exempt: renovations and additions to existing homes costing less than the construction valuation threshold. (The threshold is $100,000 initially, adjusted annually.) (§ 20.80.050); Exempt: accessory dwelling units. (§ 20.80.050).

Affordable units in new housing (inclusionary) in Mill Valley

What Mill Valley's code says

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