Holmby Hills ADU & Luxury Home Addition Architects
Top Rated Architects in Holmby Hills, CA
Designing Spaces.
Defining Lifestyles.
At I Arch Studios, every project begins with a vision — your vision. Founded on the belief that great design should be both beautiful and functional, we’ve dedicated ourselves to creating spaces that reflect how people truly live. From ADUs and remodels to new custom homes, our approach combines creativity, precision, and local expertise.
Our Architectural Services
ADU Design & Permits
We specialize in Holmby Hills ADU design, helping homeowners create functional and stylish accessory dwelling units that comply with local zoning and building codes.
General Services
As experienced architects in Holmby Hills, CA, we offer full-service solutions for ADUs, home remodels, new construction, and SB9 lot splits.
Remodels
Thinking of renovating your home? Our team has completed numerous Holmby Hills home remodels, from kitchen upgrades to full second-story additions.
Local Knowledge
With in-depth knowledge of Holmby Hills zoning laws and permit processes, I Arch Studios makes it easy to get your project approved and built.
Soft-Story Retrofits
Soft-story retrofits strengthen existing buildings with weak or open ground-floor areas, helping improve structural stability and seismic performance while meeting Los Angeles retrofit requirements.
Permit-ready architectural plans for luxury home additions, guest houses, ADUs, estate renovations, and SB9 projects throughout Holmby Hills and West Los Angeles.
Get Started on Your Holmby Hills Project Today
Contact us today to get started on your Holmby Hills ADU project or residential design in Holmby Hills
Architectural Design & Permit Expertise in Holmby Hills
Luxury ADU & Guest House Design
Holmby Hills properties often present unique opportunities for detached guest houses, ADUs, pool houses, and estate expansions. Large lot sizes and existing detached structures can create flexible options for homeowners looking to add living space while maintaining privacy and architectural consistency.
- Detached ADUs
- Luxury Guest Houses
- Pool House Design
- Attached ADUs
- Estate Expansions
- Second-Story Additions
Many properties throughout Holmby Hills, Bel Air, and nearby Beverly Hills feature expansive lots that can accommodate detached structures while preserving outdoor amenities and landscaping. Our team works closely with homeowners to create additions that integrate seamlessly with existing architecture while meeting local zoning and building requirements.
SB9 Lot Split & Development Opportunities
California SB9 regulations may create opportunities for qualifying single-family properties throughout Holmby Hills. Depending on zoning, lot dimensions, and site conditions, homeowners may be able to explore additional residential development opportunities.
Our team provides preliminary feasibility studies, zoning analysis, site planning, and architectural design services to help property owners understand potential development options before moving forward with design and permitting.
- Property Feasibility Analysis
- Lot Split Planning
- Site Development Studies
- Zoning Review
- Permit Coordination
- Architectural Design Services
Common Design & Permitting Challenges in Holmby Hills
Luxury residential properties often present unique architectural and permitting challenges that require careful planning and coordination.
- Large Estate Lot Planning
- Guest House Placement
- Utility Coordination
- Site Access Considerations
- Drainage & Grading Requirements
- Mature Landscaping Preservation
- LADBS Plan Check Corrections
- Architectural Compatibility
Identifying potential site limitations early helps reduce delays during permitting and construction. Our team regularly works through zoning reviews, engineering coordination, and city corrections throughout luxury residential projects across Los Angeles.
Frequently Asked Questions
Architectural fees in Los Angeles and surrounding cities (Glendale, Burbank, Pasadena) typically range from 5%–10% of the total construction cost for residential projects. For smaller projects like ADUs or garage conversions, some architects may offer a flat-rate design package. Hiring an architect ensures your plans meet city code and pass permit approval smoothly.
Adding an ADU (Accessory Dwelling Unit) or a home addition in Los Angeles often increases property value based on the average price per square foot in your neighborhood. For single-family homes and properties with fewer than four units, an ADU not only raises resale value but can also generate rental income, making it one of the best investments for California homeowners.
Most architectural projects in California follow these stages:
Consultation & Site Analysis – reviewing property conditions, zoning, and project goals.
Rough Design – initial sketches and layout concepts.
Design Development – refining the floor plans, elevations, and materials.
Prepare Documents – preparing detailed plans for permits and builders.
Permit Submittal – submitting to LADBS (Los Angeles Department of Building & Safety) or your local city’s planning department.
Construction Administration – optional, where your architect coordinates with contractors during the build.
In Los Angeles, Glendale, and Burbank, plan check approval usually takes 3–6 months. Timelines may be longer if your property is in a Historic Preservation Overlay Zone (HPOZ), hillside area, or near utility easements. Working with an experienced architect can speed up approvals by submitting a complete, code-compliant set of plans.
A wall can be removed only if it’s not load-bearing. Load-bearing walls support the roof, ceiling, or floor above and require a new beam or structural support to replace them. An architect or structural engineer in Los Angeles can determine if your wall is load-bearing and prepare safe, permit-ready plans for removal.
You can check eligibility for SB9 lot splits or duplex projects in Los Angeles by using the ZIMAS (Zone Information & Map Access System) tool or your city’s zoning map. Properties in very high fire zones, historic overlays, or environmental restrictions may not qualify. A licensed architect can review your parcel and confirm if SB9 applies to your property.
Under California state law, every single-family property has the right to build an ADU up to 800 sq. ft., even if local zoning would otherwise restrict it. In Los Angeles, detached ADUs can be as large as 1,200 sq. ft., depending on Residential Floor Area (RFA) limits. Glendale and Burbank also follow California ADU law but may enforce local design standards.
Always check with a local architect to confirm the latest ADU regulations for your city.
Los Angeles – Two-story ADUs are allowed if they meet height limits (generally up to 25 ft. for detached units).
Glendale – Detached ADUs are limited to single-story, though attached conversions may be possible.
Burbank – A second story is usually permitted only above an existing structure, such as a garage.
