Monrovia ADU Standards
Prefab ADU in Monrovia
What is an Accessory Dwelling Unit (ADU)?
An ADU is an independent residential unit on the same lot as a primary home, providing additional living space, rental opportunities, or multi-generational housing. A Prefab ADU is a permanent, factory-built backyard home that meets local zoning and building codes, making it ideal for long-term living.
Tiny homes, often confused with prefab ADUs, are small, mobile units built on wheels. While both can be ADUs, prefab ADUs are stationary and built to last, while tiny homes face more zoning challenges due to their mobility.
Planning to Build an ADU in Monrovia?
With the implementation of ADU regulations, Monrovia has experienced a rise in accessory dwelling unit construction. If you’re planning to build an ADU in Monrovia, LiveLarge is here to guide you through key development requirements for a smooth and successful project.
Types of ADUs
- Detached – A separate structure.
- Attached – An extension of the primary residence.
- Conversion – Existing space repurposed within a home or accessory structure.
- Junior ADU (JADU) – A 220-500 sq. ft. unit within a single-family home.
Zoning and Lot Size
- ADUs are allowed in all zones permitting single-family or multi-family housing.
- Single-Family Lots:
- One attached or detached ADU allowed.
- Conversions of garages, storage spaces, or accessory structures allowed (up to 150 sq. ft. expansion for ingress/egress).
- Reconstruction of detached structures is permitted.
- JADUs: One allowed per single-family lot via a simplified permit process.
- Multi-Family Lots: ADUs allowed, qualifying for the building permit only process.
Size and Floor Area
- Attached ADU:
- 0-1 Bedroom: Up to 850 sq. ft.
- 2 Bedrooms: Up to 1,000 sq. ft. (Max 50% of primary residence size).
- Detached ADU:
- 0-1 Bedroom: Up to 850 sq. ft.
- 2 Bedrooms: Up to 1,000 sq. ft.
- JADU: 220-500 sq. ft.
Setbacks and Height
- Attached ADU: 4-ft side/rear setbacks, 16-ft height.
- Detached ADU: 4-ft side/rear setbacks, 10-ft from primary residence, front setback per zoning, 16-ft height.
- Conversions: Existing spaces may expand up to 150 sq. ft. for ingress/egress, with setbacks sufficient for fire safety.
Parking Requirements
- One off-street space per ADU, except when:
- ADU is within ½ mile of transit, in a historic district, or converted from an existing structure.
- No on-street parking permits are available for ADU residents.
- A car-share space is within one block.
- Garage/Carport Conversions: No replacement parking required.
- Parking Guidelines:
- Must be on paved surfaces (per Chapter 17.24).
- No more than 25% of the front yard can be used for parking.
- Must not block sidewalks or fire lanes.
For more information, contact the Monrovia Planning Division at (626) 932-5581 or via email at building@monroviaca.gov.
Why Choose LiveLarge for Your ADU Project?
LiveLarge Prefab ADUs are designed to meet Monrovia’s detached ADU regulations, offering a hassle-free way to maximize property value. With pre-approved designs and expert guidance, we ensure a smooth approval process.
Let LiveLarge be your trusted partner for your ADU journey in Monrovia. With our expertise in design, construction, and pre-approved plans, we ensure your project aligns with local standards and maximizes your property’s potential. Contact us today to start your ADU project!
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