ADU Permit Changes in Glendora: What Homeowners Should Expect in 2026

The "Granny Flat" has graduated. In 2025, Accessory Dwelling Units (ADUs) are no longer just a trend; they are a primary driver of property value in Glendora. With state laws (like AB 1033) constantly evolving to encourage housing production, Glendora has had to adapt its local ordinances.

Whether you are looking to house aging parents or generate passive income, here is what you need to know about the ADU landscape this year.

Streamlined Approvals

The biggest shift we’ve seen in 2025 is the speed of approval for pre-approved plans. Glendora, like many cities, is moving toward standardizing designs to cut down on the back-and-forth at City Hall. If you choose a standard layout, you could break ground months faster than a fully custom build.

The "Condo-ization" of ADUs

One of the most talked-about changes in California law is the potential to sell ADUs separately from the main house, effectively turning them into condominiums. While adoption varies by city, this conversation is changing how investors look at large lots in Glendora. We are closely monitoring how the city implements this, as it could unlock massive equity for homeowners with big backyards.

Cost vs. Value

Construction costs have leveled off slightly but remain high. However, the appraisal value of ADUs is catching up. Appraisers are now better equipped to give proper value to a finished ADU, meaning you get a better return on investment (ROI) immediately upon completion.

Rental Demand

With rents in the San Gabriel Valley remaining strong, a garage conversion or detached unit in Glendora is a financial powerhouse. We have clients covering 30-50% of their mortgage with ADU rental income.

Strategic Advice

Before you hire an architect, call us. We can walk your lot and tell you if an ADU makes sense for resale value. Sometimes, losing the entire backyard hurts the main house's value more than the ADU helps. It’s all about balance.



Contact Us:

Does your property have ADU potential? Let’s run the numbers.

Marcus Ibrahim, Your Glendora Realtor

📞 (626) 605-1840

📧 Contact us today!