Luxury Interior Design Studio in Orange County
Plus Minus Design is a multidisciplinary interior design and architecture studio based in Costa Mesa. We create modern residential interiors throughout Orange County, Los Angeles, and San Diego with a focus on materiality, spatial clarity, and timeless living.
Our Design Philosophy
We believe exceptional interiors should do more than look beautiful — they should support the way you live every day.
Every project begins with understanding how a space should feel, function, and evolve over time. Through careful attention to proportion, light, texture, and materiality, we create interiors that are sophisticated without excess and minimalist without feeling cold.
The result is a home designed with clarity, comfort, and lasting character.
Our Services
Architecture & Spatial Design
Best for: new builds, major renovations
An architectural design service focused on flow and usage of space. This phase establishes the foundation of a project—how spaces are organized, connected, and experienced.
Scope includes:
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Floor plan development and layout optimization
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Coordination with consultants
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Full Construction Documents for permitting and construction.
Outcome:
A well-considered architectural framework that supports both functionality and design integrity.
Full-Service Interior Design
Best for: clients seeking comprehensive design and execution support
An end-to-end service ensuring consistency, precision, and quality throughout the project lifecycle.
Scope includes:
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Detailed design development and drawings
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Material, fixture, and finish selections
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Sourcing and procurement
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Contractor coordination and site involvement
Outcome
A cohesive, refined space where every detail feels intentional and connected.
Renovation Strategy
Best for: homeowners at the early stage of planning
A focused service designed to bring clarity before major commitments are made—helping identify where design can have the greatest impact.
Scope includes:
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Layout and spatial flow assessment
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Key opportunity identification
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Budget allocation guidance
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Initial design and material direction
Outcome
A clear, confident starting point for a successful renovation.
Pre-Sale & Value Optimization
Best for: homeowners and real estate professionals preparing a property for market
A targeted service focused on improving how a property presents—through strategic, high-impact adjustments.
Scope includes:
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Property assessment and positioning
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Targeted upgrade recommendations
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Layout and presentation improvements
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Prioritized action plan
Outcome:
Stronger buyer perception and improved market positioning.
Investor & Project Advisory
Best for: investors, flippers, and small developers
A design-led advisory service aligning project decisions with market expectations and financial outcomes.
Scope includes:
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Design calibration based on target buyer
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Layout optimization for resale
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Cost vs impact decision-making
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Repeatable design systems for efficiency
Outcome
Projects that balance design quality, cost control, and market appeal.
Our Approach
A clear and structured process ensures each project moves forward with alignment, efficiency, and attention to detail.
Initial Consultation & Strategy
Understanding your goals, priorities, and the potential of the space. This stage focuses on defining direction before design begins.
Concept & Spatial Design
Developing layout, spatial flow, and overall design intent. Key decisions are made around how the space is organized and experienced.
Design Development
Refining materials, finishes, lighting, and details into a cohesive design direction that is ready for execution.
Documentation & Coordination
Preparing drawings and coordinating with consultants and contractors to ensure clarity before construction.
Permitting
Managing or supporting the submission process required for approvals, depending on project
scope.
Construction & Implementation
Working alongside the contractor to maintain design integrity, address site conditions, and refine details throughout the build.
Our work is guided by clarity, precision, and thoughtful decision-making. Each project is approached with the intention of creating spaces that are not only visually refined, but also functional, enduring, and aligned with how they are lived in.
Our Perspective
With a background in architecture and international experience across Hong Kong and California,our studio brings a global perspective to residential design.
We are drawn to:
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natural materials and honest textures
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warm, minimal compositions
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quiet contrasts in tone and form
Our work balances structure and softness—creating homes that feel both grounded and lived-in.
Beyond Interiors
We are developing a curated collection of objects and materials—
including stone pieces and home accessories—
that extend our design language beyond the built space.
Areas We Serve
Plus Minus Design serves residential and developer clients throughout:
Newport Beach
Laguna Beach
Irvine
Laguna Niguel
Costa Mesa
Dana Point
Arcadia
Pasadena
Malibu
Orange County
Los Angeles
San Diego
