Home Additions in Los Angeles
Expand your home with thoughtful additions designed to feel like they have always belonged there.
Designed to Belong
A successful addition should feel like a natural extension of your home—not something added afterward.
D&H brings thoughtful planning, construction experience, and careful attention to architectural details to create new spaces that connect seamlessly with the existing home.
Why Homeowners Choose D&H for Home Additions
Thoughtful Integration
We consider the existing architecture, layout, and character of the home from the beginning.
Construction Experience
Structural changes, building systems, and finish details are carefully coordinated throughout the project.
Personal Oversight
Clear communication and hands-on attention keep the project moving from planning through completion.
Types of Home Additions We Build
Second-Story Additions
Create valuable new living space while maintaining the home’s existing footprint.
Master-Suite Additions
Ground-Floor Build-Outs
Custom Additions
Recent Work
The Modern Hacienda Addition & Home Remodel
A thoughtful expansion and renovation that brings new space to the home while preserving its architectural character.
The project reflects D&H’s approach to additions: understand what already works, build with respect for the original structure, and create new spaces that feel naturally connected.
From Vision to a Seamless Addition
Consultation
We learn about your home, priorities, and goals.
Planning
We define the scope, coordinate the addition with the existing home, and prepare for construction.
Construction
Our team manages the work with clear communication and careful execution.
Completion
We finish the details and deliver a new space that feels naturally connected to your home.
Neighborhoods We Serve
- Beverly Hills
- West Los Angeles
- Burbank
- Manhattan Beach
- Redondo Beach
- Marina del Rey
- Pacific Palisades
- Studio City
- Encino
- Woodland Hills
- Santa Monica
- Pasadena
- Glendale
- Hermosa Beach
- Culver City
- Brentwood
- Malibu
- Sherman Oaks
- Tarzana
- Calabasas
Frequently Asked Questions
Do I need a permit for a home addition in Los Angeles?
Yes. All structural additions in Los Angeles require LADBS building permits — there is no size threshold that exempts them — plus separate electrical, plumbing, and mechanical permits and Title 24 compliance. D&H handles the entire permit process for you.
How long does a home addition take in Los Angeles?
It depends on the type and the lot. A ground-floor build-out is typically faster, while a full second-story addition takes longer due to structural reinforcement and a longer permit review. We provide a realistic, project-specific schedule after the feasibility study and run design and permitting in parallel to compress it.
How much does a home addition cost in Los Angeles?
Every addition is unique, so the cost depends on the type (build-up vs. out), square footage, structural and foundation work, and your finish selections. Rather than quote a generic number, we provide a detailed, transparent, fixed-price proposal after an on-site feasibility study and design review.
Is it better to build up or build out?
Building up preserves yard space and can capture views, but requires reinforcing the existing structure and faces longer permits; building out is often structurally simpler but uses yard area and can hit setback and lot-coverage limits. We recommend the right approach for your lot during the feasibility study.
What is the Baseline Mansionization Ordinance (BMO), and how does it affect my addition?
The BMO limits how much floor area you can add relative to your lot size (FAR) in many LA residential zones and caps height. It’s the most common constraint on LA additions, which is why we confirm feasibility against it before design begins.
Will my home need to be vacated during the addition?
Sometimes, — especially during the roof-off phase of a second-story addition. We phase the work to minimize disruption and advise you honestly when a temporary move is the safer, faster option.
What areas do you serve?
D&H builds luxury home additions across the LA Westside, including Brentwood, Bel Air, Beverly Hills, Santa Monica, Pacific Palisades, and Malibu.
Ready to Make More Room at Home?
Whether you’re expanding your living space, adding a second story, or creating a more functional layout, we’ll help you plan an addition that feels like it has always belonged to your home.