Mimi & Hill is a luxury interior design firm in Westfield, NJ, celebrated for bespoke interiors and striking architectural detailing that blend timeless craftsmanship with modern livability.

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What Does Full-Service Interior Design Cost Per Room?

When homeowners start exploring full-service design, one of the first questions is: what is the cost per room interior design? It’s a fair question but the answer has two parts.

First, there’s the design fee: what you pay for the expertise, planning, and execution. Then, there’s the overall project investment, which includes furnishings, materials, construction, and installation.

Understanding both is key to getting a realistic picture of the cost of hiring an interior designer especially when working at a full-service, luxury level.

In this guide, we’re breaking down the interior design cost by room, including both total project ranges and typical design fees, so you can better understand what goes into the cost of luxury interior designer services.

What Does the Cost of an Interior Designer Include?

Before diving into room-by-room numbers, it’s important to clarify what you’re paying for when hiring an interior designer.

Full-service interior design typically includes:

  • Concept development and overall design direction
  • Detailed floor plans and layouts
  • Finish and material selections
  • Custom millwork and cabinetry design
  • Furniture, lighting, and textile sourcing
  • Project management and coordination with contractors and trades
  • Procurement, delivery, and installation

The cost of an interior designer reflects not just the visible end result, but the hundreds of decisions, drawings, and vendor relationships that bring a space together seamlessly.

Interior Design Cost by Room

Below is a realistic look at the cost per room interior design, including both total investment ranges and typical design fees.

Cost for Kitchen

Total Project Range: $150,000 – $300,000+
Design Fee: $10,000 – $15,000

Kitchens represent one of the most significant investments in luxury interior design and for good reason. They are no longer purely functional spaces, but the true centerpiece of the home, where daily routines, entertaining, and family life all intersect. Designing a kitchen at this level requires an exceptional degree of coordination between interior design, architecture, and construction, with every detail carefully considered long before construction begins. 

What drives the cost:

  • Custom cabinetry and millwork
  • High-end appliances
  • Stone countertops and backsplashes
  • Plumbing and electrical work
  • Layout reconfiguration and space planning

Materiality also plays a major role. Layering multiple stone types, extending materials vertically for full-height backsplashes, or introducing bespoke finishes all add depth and character but require careful sourcing, fabrication, and installation. Even seemingly subtle decisions, like achieving perfectly aligned cabinetry reveals or integrating lighting into millwork, demand a level of craftsmanship that elevates both the aesthetic and the cost. 

Kitchen quartz countertops, wall panels, and custom shaker cabinetry in a summit new jersey colonial farmhouse

The cost of hiring an interior designer for a kitchen reflects far more than surface-level selections. It encompasses strategic planning, technical expertise, and the ability to anticipate and resolve challenges before they arise.

In a space where function is just as critical as beauty, this level of foresight ultimately protects the investment, ensuring the kitchen not only looks exceptional, but performs seamlessly for years to come.

Cost for Living Rooms and Family Rooms

Total Project Range: $50,000 – $150,000+
Design Fee: $5,000 – $8,000

Living and family rooms often carry a quiet expectation: they need to feel effortless, comfortable, and lived-in while still reflecting a level of refinement that elevates the entire home. These are the spaces used most often, yet they’re also the ones guests experience first. Achieving that balance is less about filling a room and more about carefully building it, layer by layer. 

What drives the cost:

  • Custom upholstery and seating
  • Rugs, lighting, and window treatments
  • Built-ins or architectural details
  • Art and accessories

Seating is rarely one-size-fits-all. Custom upholstery ensures the right proportions, comfort, and durability. Making it tailored to how the space is actually used, down to the smallest details.

Layered elements like rugs, window treatments, and lighting then anchor the room by defining layout, adding softness, and creating a warm, functional atmosphere throughout the day.

Architectural details such as built-ins or paneling bring depth and permanence, making the space feel integrated rather than decorated, while offering a backdrop for personal pieces.

The final layer is art and accessories, it what brings everything together, adding personality and creating a space that feels intentional, collected, and complete.

What sets these spaces apart is not a single element, but the cohesion between all of them. Designing a living or family room at this level involves a high degree of curation, customization, and restraint by ensuring the space feels complete, elevated, and deeply personal rather than simply styled. 

Cost for Dining Room

Total Project Range: $25,000 – $100,000+
Design Fee: $5,000 – $8,000

Dining rooms are often about creating a moment within the home. Spaces that feel intentional, elevated, and ready to host, whether for everyday dinners or larger gatherings. While they may include fewer pieces than other rooms, each element tends to carry more visual weight, which is where much of the investment comes in.

What drives the cost:

  • Dining table and seating
  • Statement lighting
  • Wall treatments or millwork
  • Rugs and drapery

The dining table typically anchors the entire room, often custom or sourced for its scale, materiality, and presence. Seating follows closely behind, with a focus on both comfort and silhouette, especially in spaces designed for lingering. Lighting plays a defining role as well, often acting as a focal point that sets the tone for the entire room.

Architectural details like paneling, wallpaper, or custom millwork add depth and character, while rugs and drapery soften the space and bring it to a fully finished state.

Larchmont living room with hand-blown Murano glass orbs above preserved marble fireplace, highlighting Jazz Age interiors and Art Deco style.

The cost of an interior designer in a dining room is rooted in composition. With fewer elements, each decision matters more requiring a trained eye to balance proportion, material, and visual impact so the space feels cohesive, intentional, and complete.

Cost for Primary Bedroom

Total Project Range: $30,000 – $120,000+
Design Fee: $5,000 – $7,000

Primary bedrooms are designed to feel calm, soft, and deeply personal a retreat within the home that prioritizes both comfort and quiet refinement. While the palette is often more subdued, the level of detail and material quality is what defines the space.

What drives the cost:

  • Custom beds and upholstered furniture
  • Storage and case goods
  • Window treatments and layered lighting
  • Rugs and bedding

The bed is the focal point, often custom-designed for the right scale, silhouette, and level of comfort. Upholstered pieces, from headboards to benches, introduce softness and texture, while case goods provide both function and visual balance.

Window treatments and lighting are carefully layered to create a sense of ease throughout the day, from soft morning light to a more ambient, relaxed evening atmosphere. Rugs and bedding complete the space, adding warmth and a tactile quality that makes the room feel finished and inviting.

The luxury interior design cost in bedrooms is less about statement and more about restraint: where comfort, material quality, and subtle detailing come together to create a space that feels effortless but highly considered.

Cost for Primary Bathroom

Total Project Range: $75,000 – $200,000+
Design Fee: $6,000 – $8,000

Primary bathrooms are often designed as spa-like retreats that prioritize comfort, calm, and a sense of everyday luxury. Beyond aesthetics, they require a high level of planning to balance layout, function, and material performance in a moisture-heavy environment.

What drives the cost:

  • Custom vanities and millwork
  • Plumbing fixtures
  • High-end tile and stone
  • Specialty features like heated floors

Custom vanities anchor the space, often designed for both beauty and storage, while showers and tubs are carefully planned to maximize both experience and efficiency. Tile and stone selections play a defining role, frequently extending across floors, walls, and wet areas, requiring precise installation and detailing. Specialty features like radiant heated floors or integrated lighting add another layer of comfort and complexity.

Bathroom with freestanding bathtub, coastal interior decorating, nautical design, and bespoke finishes in a heritage home.

The cost of luxury interior designer services in primary bathrooms reflects the level of detail, material coordination, and technical planning required to create a space that feels seamless, elevated, and built to last.

Cost for full Bathroom

Total Project Range: $35,000 – $90,000+
Design Fee: $5,000 – $7,000

Secondary bathrooms require thoughtful material and layout decisions, often within a more compact footprint. While smaller in scale, these spaces still demand precision to ensure they feel cohesive, functional, and aligned with the rest of the home.

What drives the cost:

  • Tile and stone
  • Vanities and Plumbing fixtures
  • Lighting and mirrors

Tile and stone carry much of the visual weight, with cost influenced by material selection, layout, and installation detail. Vanities and plumbing fixtures balance performance and proportion, often requiring custom sizing or considered finishes. Lighting and mirrors bring clarity and polish, elevating even the most utilitarian spaces.

Interior design cost by room in secondary bathrooms is driven by durability and precision where tight layouts and exacting details ensure the space feels intentional, efficient, and fully resolved.

Why Interior Design Cost by Room Varies

Every home and every client brings a different set of priorities, constraints, and expectations. Because of this, the cost of hiring an interior designer is rarely one-size-fits-all and is instead shaped by a combination of key factors:

  • Level of customization
  • Material selections
  • Scope of work (furnishing vs. renovation)
  • Existing conditions
  • Size and scale of the home

Highly customized spaces, whether through bespoke millwork, tailored furnishings, or intricate layouts, naturally require more design time, coordination, and craftsmanship. Material selections also play a significant role, as the difference between standard and specialty finishes can quickly shift the overall investment.

Scope is another major driver. A furnishing project focused on layering furniture and finishes differs greatly from a renovation that involves reworking layouts, plumbing, and construction. Existing conditions can introduce additional complexity as well. Older homes or previously renovated spaces often require more problem-solving to align with the new design vision.

Finally, the size and scale of a home impacts not just the quantity of furnishings and materials, but the level of detail required to ensure consistency throughout.

This is why luxury interior design cost is best understood as a range rather than a fixed number it reflects the level of thought, customization, and coordination needed to create a home that feels cohesive, intentional, and truly tailored to the way it’s lived in.

Modern kitchen interior with marble countertops, custom wood cabinetry, and brass fixtures designed by Mimi & Hill, a Westfield NJ interior design studio specializing in new construction and renovation.

A Smarter Way to Approach Cost Per Room Interior Design

One of the most effective ways to manage the cost per room interior design is to approach your home in phases. Many homeowners choose to:

  • Complete one or two rooms at a time
  • Fully invest in each space
  • Continue over time

This allows each room to feel complete while making the cost of luxury interior designer services more manageable. It also tends to result in a more cohesive and elevated home overall.

Final Thoughts: Is Hiring an Interior Designer Worth The Cost?

The cost of hiring an interior designer is ultimately an investment in both your home and your experience of it.

Without guidance, it’s easy to make costly mistakes, overlook important details, or end up with a space that doesn’t fully work. Hiring an interior designer ensures that every decision—big or small—is made with intention.

For homeowners who want a home that feels layered, cohesive, and deeply personal, the value goes far beyond the numbers.

Because in the end, the true return on luxury interior design cost isn’t just how a space looks, it’s the process feels, and how the home functions.

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