Los Altos ADU leads to tree deaths and concerns about building proximity

During the Cupertino Planning Commission meeting on February 25, 2025, significant concerns were raised regarding the impact of Accessory Dwelling Units (ADUs) on the environment and community safety. A particular case from Los Altos highlighted the potential consequences of poorly planned ADU construction. An ADU built six months prior resulted in the destruction of two mature oak trees, which were approximately 80 years old. The trees died after the construction, leading to a requirement for the property owner to plant four new trees, a move criticized as senseless and wasteful.

The discussion emphasized the need for stricter regulations surrounding ADU placements, especially in sensitive areas. The speaker pointed out that the ADU was constructed just four feet from a neighboring property line on a hillside prone to erosion, raising concerns about the safety and environmental impact of such close proximity. The existing house on the property was already substantial, measuring 3,000 square feet, which further fueled the argument against additional structures in tight spaces.

The meeting also touched on broader issues faced by other cities regarding ADUs. In Los Angeles, new regulations have halted ADU construction in fire-prone areas due to concerns about water access for firefighting. Similarly, San Francisco is grappling with challenges related to the identification and safety of ADUs, particularly in emergency situations.

In addition to the discussion on ADUs, the commission reviewed policy LU 3.3, which pertains to building design. The speaker critiqued the subjective nature of terms like "attractive design" and "mass and scale," suggesting that these criteria could lead to inconsistencies in planning decisions.

Overall, the meeting underscored the need for careful consideration and regulation of ADUs to balance housing needs with environmental protection and community safety. As Cupertino continues to navigate these challenges, the implications of these discussions will likely influence future planning policies and community development strategies.