Quick Answer: Pasadena exempts accessory dwelling units of 900 square feet or less from its Residential Impact Fee, along with reductions on several other related fees. Larger units can still access the same fee exemption by signing a Housing Agreement with the city, committing the unit to family or affordability-restricted rental use. Neither path changes the fact that building an ADU will typically increase the property’s overall assessed value for tax purposes going forward.
Does Pasadena waive ADU permit fees entirely?
Not entirely, and only under specific conditions. Units at or below the 900-square-foot threshold are exempt from the largest fee (the Residential Impact Fee) and get reduced rates on several smaller fees. Units above that threshold pay the impact fee in full — unless the owner takes the second path below.
How can a larger ADU still get the fee waiver?
By recording a formal, multi-year Housing Agreement with the city before permit issuance — typically committing to rent the unit either to a family member or a tenant meeting certain affordability criteria for several years. This unlocks the same fee treatment regardless of the unit’s size, but it comes with a real, binding commitment, not just a paperwork formality.
What’s the catch with that agreement?
Timing, mainly — it generally has to be signed and recorded before the permit is issued, not after. Signing later typically doesn’t apply retroactively, and any fee reduction already extended in anticipation of the agreement usually has to be repaid if it isn’t finalized in time.
Does going through a city-provided “standard plan” get the same fee treatment?
Often, yes — many cities offering pre-approved ADU plan options extend similar fee benefits to those who use a standard design, as an incentive for faster, more predictable permitting. The trade-off is generally that modifications to the standard plan aren’t allowed.
Will the ADU still increase my property taxes, even with the fees waived?
Yes — this runs on a completely separate track from any permit fee waiver. Building an ADU typically triggers a separate property tax assessment on the new construction itself, distinct from the existing house’s assessment, regardless of which fee-waiver path the owner used to build it. A fee waived at the permit stage isn’t the same as a tax exemption once the unit is finished.
Related reading: Glendale’s ADU Rules Are Mid-Fix and California Supplemental Property Tax Bill Explained.
Frequently Asked Questions
Does the size threshold apply the same way to Junior ADUs?
Junior ADUs are typically capped at a smaller size across California generally, which usually puts them automatically within any small-unit fee exemption without needing the additional agreement.
Can I sign the fee-waiver agreement after my permit is already issued?
Generally no — these agreements typically need to be executed before permit issuance to apply.
Who actually calculates the impact fee amount for a larger ADU?
This is often handled by a city’s Public Works department (rather than Planning), using the property’s specific characteristics and the currently adopted fee schedule — not a single flat number that applies identically to every ADU.
Does a property inside a historic district face different ADU rules regardless of fees?
Often yes — a historic district can restrict what type of ADU is even permitted to be built (for example, requiring it not be visible from the street), independent of anything related to fees. This is a permitted-use question, not something a fee waiver resolves.
General information about a city fee program, not legal or tax advice. Fee amounts, thresholds, and program terms change — confirm current figures directly with Pasadena’s Planning & Community Development Department before applying for a permit.
About Will Flannigan
Will Flannigan is a California licensed real estate agent (DRE #01951292) and Certified Trust & Probate Specialist (CTPS) with The Nell Team at Equity Union Real Estate. A former attorney, Will brings a background in property management and over a dozen home flips to every transaction, and has been licensed since 2014. A 20+ year resident of Burbank Rancho, Will specializes in Burbank, Altadena, Pasadena, Glendale, and the greater San Gabriel Valley, with fluency in Mandarin serving clients in San Marino and beyond.
Weighing an ADU on a Pasadena property? Factoring fees, taxes, and resale value into the decision before you design is where the right agent can help. Let’s talk.
📞 (310) 920-1108
📧 flanniganhomes@gmail.com
🌐 willflanniganrealestate.com
📍 4404 Riverside Dr. Suite D, Burbank, CA 91505