FULL-SERVICE INTERIOR DESIGN IN
LAGUNA BEACH
Also serving Orange County, San Francisco + select projects beyond
The Fourth House Interiors is a full-service residential interior design studio 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
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 INTERIOR DESIGN PROJECTS
Laguna Beach · Orange County · San Francisco
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
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.
OUR PROCESS
MEET SIERRA
I’m Sierra Sullivan, Founder and Principal Designer of The Fourth House Interiors. For more than three decades, my work has been rooted in beauty and visual storytelling, first as a model, then as an artist and photographer. Those experiences shaped my eye for proportion, composition, and detail, while my desire to create meaningful living spaces led me to pursue formal training in interior design.
Today, that training and hands-on experience inform an approach that balances artistic vision with architecture and the realities of daily life. My process begins with listening: understanding how you live, what you need, and how you want your home to feel. I’m drawn to the quiet nuances that give a space depth, individuality, and a lasting sense of place.
I work collaboratively with clients, architects, and builders so that each decision feels considered and the finished home feels cohesive and personal.
If you’re ready to talk about your home, I’d love to hear from you.
“Working with Sierra transformed the interior of my new home. She listened carefully, understood my personal style, and brought a refined eye and thoughtful attention to every decision. Over the course of our five-month project, she stayed on top of the details and managed communication with multiple vendors, making the entire process feel organized and far less stressful. My home now feels cohesive, elevated, and truly reflective of me. Sierra genuinely cares about her clients, and I cannot recommend her enough.”
— Shauna G. | Primavera Project —