FULL-SERVICE INTERIOR DESIGN
LAGUNA BEACH AND SAN FRANCISCO
The Fourth House Interiors is a full-service residential interior design studio based in Laguna Beach, serving Orange County, San Francisco Bay Area, Southern California, and select projects nationwide. The studio specializes in partial and full-home renovations, new construction, and thoughtfully layered interiors designed in collaboration with architects and builders. We partner with discerning clients who value exceptional design and a thoughtful, collaborative process.
WHO WE ARE
OUR DESIGN APPROACH
For us, design begins with understanding how a home is meant to feel, and evolves through thoughtful material selection, proportion, and restraint. Each project is approached holistically, whether a full-home renovation, ground-up build, or comprehensive furnishing. The goal is not to impose a singular style, but to create interiors that feel inevitable to the architecture and authentic to the people who live within them. The result is work that feels quiet, intentional, and enduring.
SELECT RESIDENTIAL + COMMERCIAL PROJECTS
Laguna Beach · Orange County · San Francisco
SAN JUAN CAPISTRANO - Full Home Remodel
SAN JUAN CAPISTRANO - Full Home Remodel
SAN JUAN CAPISTRANO - Full Home Remodel
NORTH TUSTIN - Living Room Furnishing
NORTH TUSTIN - Living Room Furnishing
NORTH TUSTIN - Living Room Furnishing
NORTH TUSTIN - Nursery Furnishing
NORTH TUSTIN - Nursery Furnishing
NORTH TUSTIN - Nursery Furnishing
SAN CLEMENTE - Kitchen Remodel
SAN CLEMENTE - Kitchen Remodel
SAN CLEMENTE - Kitchen Remodel
WHAT WE DO
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Collaboration with architects and builders
New construction
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Remodels
Collaboration with architects and builders
Partial and full-home renovations
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Full-home furnishing
Layered interiors
Procurement management
Installation coordination
OUR PROCESS
Projects are developed through a structured process that allows design decisions to be carried consistently from concept through construction and installation.
Discovery → Concept Development → Documentation → Procurement → Installation
The Fourth House Interiors works closely with architects, builders, and craftspeople to ensure that design decisions are carried thoughtfully from early concept through construction and installation. The studio values collaboration as an essential part of creating cohesive, well-executed homes.
Learn more about our services HERE
MEET SIERRA
I’m Sierra Sullivan, Founder and Principal Designer at The Fourth House Interiors. For over three decades, I’ve been immersed in the world of beauty and visual storytelling, first as a model, then as an artist and photographer. These experiences honed my eye for aesthetics and composition, but it was my passion for creating living spaces that led me to achieve a formal education in interior design.
My formal training in interior design and hands-on experience with clients shaped a unique approach that blends artistic vision with a thoughtful response to architecture and the way a home is lived in. My process always begins with truly hearing your needs, desires, and the story you want your space to tell.
I believe that great design is born from a deep understanding of both the client and the environment. I’m known for my attention to detail and for the quiet nuances that give a space depth and individuality.
Many projects begin early in the planning process and evolve over time, allowing the interiors to develop thoughtfully alongside the architecture and the way a home will ultimately be lived in. This collaborative approach ensures that each decision feels considered, cohesive, and lasting.
If you’re ready to talk about your home, I’d love to hear about it.
“Working with Sierra from Fourth House Interiors was an absolute game-changer for the interior design of my new home. From the get-go, she demonstrated a remarkable level of professionalism and dedication. Her attention to detail and refined taste truly elevated the style of my new home. What sets her apart is her ability to truly listen and capture your unique style. Thanks to her expertise, my home now reflects my personality in every corner, guided by her exquisite sense of design. One of the things that impressed me the most about working with Sierra was her ability to stay on top of everything. Our project spanned over 5 months and she seamlessly managed communication with different vendors, ensuring that every aspect progressed smoothly. This level of organization and coordination made the entire process much less stressful for me. She truly cares about her clients and treats your home as if it’s her own with the level of care and thought she puts into all her decisions. You can trust that your vision for your home will not only be realized but exceeded in every possible way. I cannot recommend her enough. Thank you, Sierra!”
— Shauna G. | Primavera Project —