Building a Custom ADU in Glendale? Here's Everything You Need To Know

Glendale homeowners are rethinking how they use their properties—and a custom ADU has become one of the most effective ways to add meaningful, long-term value. Whether it’s for rental income, multigenerational living, or simply more breathing room, a well-designed ADU offers flexibility that adapts as your needs evolve. 

If you're exploring the idea of a custom ADU in Glendale, working with a builder who understands both the neighborhood and the permitting process is key. As a seasoned general contractor in Los Angeles, NEO Builders and Design has helped Glendale homeowners transform garages, backyards, and empty lots into fully customized living spaces. Our in-house team handles everything from design and zoning to build-out and inspections—so your project stays efficient and stress-free. Book a free ADU consultation to learn what’s possible on your lot.

What Makes Glendale the Perfect City for a Custom ADU?

A High-Value Market With Long-Term Rental Demand

​​With its high average home prices and limited rental inventory, Glendale is prime territory for building a custom ADU. According to recent data, the average rent for an apartment in Glendale is approximately $3,009 per month, with one-bedroom units averaging around $2,074 and two-bedroom units about $2,630. 

Local ADUs often rent for $2,400 to $3,500+ per month, especially detached or backyard units with private entrances and premium finishes. For homeowners seeking passive income, the potential return is substantial—without sacrificing privacy or resale appeal.

A Growing Trend Toward Multigenerational Living

Nearly 1 in 5 Americans now live in multigenerational households, according to Pew Research Center. As housing costs rise and caregiving needs grow, more families are choosing to live together—and a custom ADU offers a smart, private way to make that work. Parents, college-aged kids, or extended relatives can all live on the same property with their own space—close enough to stay connected, but with the privacy everyone needs. Compared to major home additions or buying a larger property, building an ADU in Glendale provides lasting flexibility with far less disruption.

Local Zoning That Favors Homeowners and Investors

Glendale ADU regulations are designed to support both homeowners and housing expansion, making it easier to build additional units without excessive red tape. Under the current City of Glendale ADU ordinance—aligned with California’s statewide policy—most residential lots qualify for both a detached unit and a Junior ADU (JADU), as long as zoning and lot requirements are met. The city also allows reduced setbacks and waives parking requirements in many cases, such as garage conversions or homes located near public transit. These guidelines make it far more accessible to add livable space or create a long-term rental opportunity.

Still, understanding what’s allowed—and how to apply it to your specific lot—can be complicated. Working with an experienced ADU builder in Glendale ensures the permitting process moves efficiently and that your design makes the most of what the local zoning code allows.

What Is a Custom ADU—And Why Build One Instead of a Prefab?

Custom vs. Prefab ADUs: What’s the Difference?

A custom ADU is architecturally tailored to your property, lifestyle, and design preferences. Unlike prefab models—which are typically pre-engineered with minimal flexibility—custom units are designed from scratch. Everything from the layout to the roofline is shaped by your goals. In upscale markets like Glendale, that customization often translates into higher ROI and a better living experience.

There is also a common misconception that prefab ADUs are more affordable since they are primarily manufactured off-site. However, when you factor in site prep, transportation, and crane rentals costs, the cost of the unit comes out to about the same as a custom ADU. The value of a prefab ADU comes from its speed, often taking as little as one week to be move-in ready which is a big selling point for homeowners looking for a fast solution.

Why Fully Custom ADUs Offer More Design Flexibility and Long-Term Value

Prefab units may offer speed, but they rarely align with Glendale’s varied lot shapes, architectural styles, or high buyer expectations. A custom ADU builder can position the unit to optimize sunlight, match roof pitch, and align with local code intricacies. That flexibility adds lasting value—especially if you ever sell your home.

Tailoring Your ADU to Match Property Value and Lifestyle

In Glendale, the most effective ADUs are the ones that feel like they’ve always belonged on the property. A thoughtful design considers how the space will actually be used—whether it’s for guests, aging parents, a workspace, or rental income—and how it fits into the overall layout of the lot. Matching materials, aligning rooflines, and maintaining visual flow with the main home all play a role in making the unit feel cohesive.

Popular Design Features: Storage, Finishes, Outdoor Access

Common requests in ADU designs in Glendale reflect both the space limitations of smaller units and the high expectations of homeowners in the area. Popular features include:

• Smart storage solutions – Built-ins, under-bench compartments, and integrated shelving help maximize floor space and minimize clutter.

• Vaulted ceilings – Visually expand the interior and make small spaces feel more open and breathable.

• Custom cabinetry – Efficient and design-forward, especially important in kitchens and bathrooms where every inch counts.

• Large windows or sliding doors – Maximize natural light and open directly to patios or gardens, supporting indoor-outdoor living.

• Drought-tolerant landscaping – Ideal for Glendale’s climate and water conservation goals, while also keeping maintenance low.

To see what’s possible on real properties, check out our ADU property tours..

Understanding Glendale’s ADU Rules (So You Don’t Hit Roadblocks)

Size Limits, Setbacks, and Height Restrictions

Per the Glendale ADU ordinance, detached ADUs can be up to 1,200 sq. ft., while attached ADUs are capped at 50% of the primary home’s size unless they’re under 800 sq. ft. Setbacks are typically 4 feet from the side and rear, and height limits vary by zone. Glendale CA ADU requirements also allow two-story ADUs in many cases, though neighborhood-specific overlays may impose height or aesthetic constraints.

Parking and Fire Code Requirements

You don’t need to provide new parking if your property is within half a mile of public transit, part of a garage conversion, or located in a historic district. Replacement parking is also not required when existing garages or carports are converted into living space.

Fire code compliance is another important part of the design process. Detached ADUs must maintain a minimum distance from other structures unless separated by fire-rated construction. Fire sprinklers are not required for ADUs unless they’re required for the main residence—but your unit still needs to meet all applicable fire safety setbacks and access requirements.

What You Need to Know About Utility Tie-Ins and Title 24

All ADUs in Glendale must connect to sewer, water, and electrical systems. For detached units, this often means installing new meters, separate subpanels, or upgraded utility infrastructure to support the added demand. In some cases—especially with conversions—utilities can be shared with the main home, but independent connections may be required depending on layout and usage plans.

In addition, California’s Title 24 energy code applies to all newly constructed ADUs. This set of regulations governs everything from insulation and lighting to ventilation and water heating. You’ll need to meet minimum standards for things like wall insulation R-values, high-efficiency lighting, and mechanical ventilation. These requirements help lower long-term utility costs, but they also affect how your ADU must be designed and built from the start.

If you are building a new detached structure, your ADU will require solar panels. Prefab ADUs are exempt from this requirement. 

An experienced team like NEO Builders will ensure all Title 24 documentation is included in your permit application—and that your ADU is planned to pass inspection without surprises.

Step-by-Step: From Design to Move-In

Initial Consultation and Feasibility Assessment

This is where you determine what’s possible. A site review evaluates setbacks, access, slope, and zoning overlays. NEO Builders offers free ADU consultations to help homeowners understand what their lot can accommodate.

Working With an Architect to Finalize Plans

An in-house architect will draft a layout that reflects your goals, complies with code, and integrates visually with your main home. During this phase, design features, materials, and utility placement are locked in.

Permitting, Construction, and Final Sign-Off

After plan approval, permits are submitted to the City of Glendale. Review can take 1–4 months. Once approved, construction begins—usually starting with grading and foundation, then framing, MEPs (mechanical, electrical, plumbing), finishes, and final inspection. As the fastest ADU builder in Los Angeles, NEO Builders completes many standard projects faster than typical market timelines.

Is a Custom ADU in Glendale Right for You?

Homeowners Looking for Passive Income

If your property is in a walkable Glendale neighborhood with strong school zones or job centers, a custom ADU in Glendale can bring in consistent, long-term rental income. Detached units with private outdoor access rent especially well.

Families Planning for Elder Care or Young Adults

Multigenerational living is on the rise. A Glendale ADU offers a balance of independence and proximity, making it ideal for aging parents, returning children, or live-in caregivers.

Those Who Want More Space Without Moving

With Glendale’s median home price exceeding $1 million, expanding on-site is often more realistic than relocating. A well-designed custom ADU in Glendale adds usable square footage without the upheaval of a full move.

FAQs About Building a Custom ADU in Glendale

How long does it take to build a custom ADU in Glendale?

Most projects—from initial consultation to final inspection—take 6 to 12 months, depending on design complexity and permitting timelines.

Can I build more than one ADU or a JADU on my lot?

Yes. Most single-family lots are eligible for one ADU and one JADU, as long as they meet zoning and size requirements.

Will a custom ADU increase my home’s appraisal value?

Absolutely. Homes with permitted ADUs often appraise for tens (or hundreds) of thousands more, depending on the build quality and market conditions.

Is a detached ADU better than converting a garage?

Detached units provide more privacy, rental value, and design flexibility. However, garage conversions are quicker to permit and often more cost-effective.

There’s no concrete answer to which is better as every scenario is different. That’s why we highly recommend writing out your pros and cons for each to help you determine which will work better for your lifestyle. 

We also cover the different ADU types, provide you with the tools to make the right decision, and walk you through the entire ADU process in our new E-course. Check out a free preview of the first lesson.

What kind of permits do I need, and how long does it take?

You’ll need building, plumbing, electrical, and energy permits. Review timelines in Glendale typically range from 30 to 120 days.

Does NEO Builders handle everything, or do I need to hire multiple pros?

NEO Builders is a full-service design-build firm. From concept to completion, we manage every step—including permitting, design, and construction—so you don’t have to coordinate with multiple contractors.

Ready to Build a Custom ADU in Glendale? Here’s Your Next Step

Book a Free ADU Consultation With NEO Builders

Curious what you can build on your lot? Schedule a free ADU consultation and get clarity on what your property qualifies for—before committing to design plans.

Explore Tailored Designs That Fit Your Space and Your Goals

From home offices to rental-ready guesthouses, explore ADU design ideas in Glendale that are built to elevate your lifestyle. Our team will help shape a design that’s aligned with your space, goals, and long-term vision.

Get Trusted Local Expertise From Glendale’s Leading ADU Builder

With years of experience building ADUs across Los Angeles County, NEO Builders knows how to navigate Glendale’s zoning rules, streamline permitting, and deliver results built to last.