The Fourth House Interiors is a full-service residential interior design studio based in Laguna Beach, California, serving Orange County and San Francisco, and nationally. 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
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.
OUR DESIGN APPROACH
SELECT RESIDENTIAL + COMMERCIAL PROJECTS
Laguna Beach · Orange County · San Francisco
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 JUAN CAPISTRANO - Full Home Remodel
SAN JUAN CAPISTRANO - Full Home Remodel
SAN JUAN CAPISTRANO - Full Home Remodel
SAN FRANCISCO - Retail Space Furnishing
SAN FRANCISCO - Retail Space Furnishing
SAN FRANCISCO - Retail Space Furnishing
SAN CLEMENTE - Kitchen Remodel
SAN CLEMENTE - Kitchen Remodel
SAN CLEMENTE - Kitchen Remodel
WHAT WE DO
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Remodels
Collaboration with architects and builders
New construction
Partial and full-home renovations
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Full-home furnishing
Layered interiors
Procurement management
Installation coordination
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Designer for a day
E-Design
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
HELLO!
I'm thrilled you've found your way here. 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.
After years of rigorous study and hands-on experience with clients, I've developed 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 listening and 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.
I invite you to imagine the possibilities for your own space. Let’s collaborate to bring your vision to life, working thoughtfully within the architecture of your home and alongside the teams who help bring it to completion, creating a home that's not just designed, but deeply felt.
Looking forward to our journey together!
