40+ Duplex Design Models: The art of creating multi-level living spaces

SENDESIGN

August 8, 2026

Table of Contents

Duplex design is not just the problem of arranging two floors in an apartment, but the art of creating spatial rhythm according to height. Featuring double floors and open structure, each design solution requires careful calculation of proportion, light and the homeowner’s long-term living experience. The collection below suggests sophisticated, personality-rich approaches to multi-level spaces.

1. What is a Duplex apartment? Characteristics of Duplex design

Duplex is a type of housing consisting of two separate living spaces in the same building block. Usually, two apartments are arranged in the form of two stacked floors or located parallel to each other, each apartment has its own entrance. Thanks to that, duplex provides the same privacy as an independent house, but still shares the same overall structure.

Duplex design needs attention because this is a type of vertical space exploitation, requiring different architectural thinking compared to conventional housing. With a two-storey structure connected by an interior staircase, the duplex allows for a clear separation of common living areas and resting spaces, while taking advantage of high ceilings, mezzanine and open layout to create a “true home” feeling in the narrow urban context.

Architectural elements such as the central staircase, large openings and soft lines help the space have both an aesthetic highlight and optimize light and visibility. Thanks to the ability to highly personalize, from the office, gym to art gallery space, duplex not only enhances living experience but also increases use and investment value compared to conventional single-storey apartments.

Advantages & limitations when designing Duplex:

AdvantagesDisadvantagesLarge, flexible space: Large area allows clear functional stratification, bringing a living experience almost like a villa. Easy to generate noise from the kitchen or living area below; Maintenance is more complicated due to the space being divided into two floors. High level of privacy thanks to the division of space into each area; Better natural light thanks to large windows, balconies or terraces, creating a spacious feeling even though the area remains unchanged. Careful design is needed to ensure a seamless flow of movement and living experience. High-end amenities: Inheriting internal amenities, easy to personalize the interior according to needs. Open living space: Usually has a garden, balcony or outdoor area, suitable for small families and pet owners. With the ability to flexibly combine function and aesthetics, duplex can also be oriented in many different design languages, of which Nordic style home design is a suitable choice thanks to the priority of natural light, rustic materials and the feeling of minimalist but comfortable living.

2. 40+ Practical Duplex designs for each space

Below are 7+ Duplex designs deployed in each functional area, clearly demonstrating how to organize multi-level space in a coherent and sophisticated way:

2.1. Duplex living room at floor level

The double-height living room is a typical highlight of the Duplex. High ceilings, large glass walls and statement lamps help the space become majestic, luxurious and rich in visual depth. This is also the area that most clearly shows the homeowner’s aesthetic taste, often combining large sofas, natural stone and multi-layered lighting systems. With the spirit of promoting open space and the connection between architecture and landscape, these space organization ideas also have many similarities with the design of Vinhomes Riverside villas, where the living room is often considered the center of classy living experience.

Phòng khách trong căn hộ Xenia Sungrand City — *Living room in Xenia Sungrand City apartment – Cozy, festive space with delicate curving lines and soft lighting*

Phòng khách trong căn hộ Sunshine City Duplex — *Living room in Sunshine City Duplex apartment – Sparkling metal wave ceiling creates an impressive highlight for the luxury space*

Phòng khách trong căn hộ Duplex Hateco Laroma — *Living room in Duplex Hateco Laroma apartment – The perfect entertainment space, from the piano to the exquisitely displayed wine bar*

Phòng khách trong Ecogreen City Duplex — *Living room in Ecogreen City Duplex – Sophisticated mezzanine design, optimal natural light and maximum comfort*

Phòng khách trong căn hộ Duplex Define Penthouse — *Living room in Duplex Define Penthouse apartment – Luxurious living space with minimalist interior and sophisticated lighting details*

2.2. Duplex stairs

The staircase is not only a way to connect two floors but also acts as an “architectural work” in space. Popular designs include flying stairs, glass railings, metal or natural wood handrails, creating a light and elegant feeling. When proportions and lighting are handled well, the stairs become a soft highlight among the overall strength of the Duplex. These principles of balance between shape, function and spatial connection are also applied in duplex villa design, where architects need to optimize privacy while still ensuring continuity in the living experience.

Cầu thang xoắn trong căn hộ Duplex Hateco Laroma — *Spiral staircase in Duplex Hateco Laroma apartment – The perfect harmony between the cooking area and impressive sculptural design*

Cầu thang xoắn trong căn hộ Ecopark Duplex — *Spiral staircase in Ecopark Duplex apartment – Mysterious black metal accents combined with sculptures and urban panorama views*

Cầu thang xoắn trong căn hộ Sunshine City Duplex — *Spiral staircase in Sunshine City Duplex apartment – Luxurious living space with sparkling wave ceiling and spiral staircase as the center*

2.3. Duplex kitchen & dining room

The kitchen and dining room in a Duplex are often arranged in an open layout, connected to the living room to increase connectivity. Large kitchen island, floor-to-ceiling cabinets and 8-10-seat long dining table suitable for large families or intimate receptions. This space prioritizes functionality, durable materials and warm lighting to create a feeling of togetherness. This space organization that promotes privacy but still maintains connectivity is also an important factor in the design of a detached villa, where each functional area is personalized according to the homeowner’s needs and lifestyle.

Phòng bếp/khu vực ăn trong căn hộ Sun grand City Duplex — *Dining area in Sun grand City Duplex apartment – Sparkling metal round chandelier accents the luxurious dining table and seamless kitchen space*

Khu vực ăn trong căn hộ Sun grand City Duplex — *Kitchen and dining area in Ecopark Duplex apartment – Dark luxury design with LED border lighting and impressive geometric kitchen island*

Phòng bếp và khu vực ăn trong căn hộ Ecopark Duplex — *Kitchen area in Sunshine City Duplex apartment – Kitchen design adjacent to the dining area, bringing high-class comfort and aesthetics*

Phòng ăn trong căn hộ Duplex Ecogreen — *Dining room in Duplex Ecogreen apartment – Luxurious dining space with iridescent curved ceiling and sophisticated dark furniture*

Phòng bếp trong căn hộ Duplex Feliz — *Kitchen in Duplex Feliz apartment – Central dining table with modern chandelier and seamless kitchen island, ideal for luxury families*

Phòng bếp/khu vực ăn trong căn hộ Duplex Define — *Kitchen/dining area in Duplex Define apartment – Contemporary design, where brown wood, marble and chandeliers create sophisticated beauty*

2.4. Duplex master bedroom

The master bedroom is usually located on the upper floor to ensure privacy. The large area allows for the integration of a walk-in closet and private bathroom, creating the feeling of a high-end hotel “suite”. The design focuses on soft lighting, neutral color palettes and soft materials to optimize the resting experience. The spirit of promoting elegance, balance in proportion and taking care of every detail is also the point of intersection with French-style villa design, where the living space is created in a luxurious, sophisticated direction and has sustainable value over time.

Phòng ngủ trong căn hộ Sungrand City Duplex — *Bedroom in Sungrand City Duplex apartment – The perfect balance between soft fabric texture and glossy black glass material, creating a feeling of minimalist luxury*

Phòng ngủ trong căn hộ Duplex Hateco Laroma — *Bedroom in Duplex Hateco Laroma apartment – Comfortable king-size bed, ideal for deep sleep in luxury design*

Phòng ngủ trong căn hộ Sunshine City Duplex — *Bedroom in Sunshine City Duplex apartment – Transparent glass walk-in cabinet seamlessly connects with the sleeping area, optimizing space and natural light*

Phòng ngủ trong căn hộ Duplex Ecogreen — *Bedroom in Duplex Ecogreen apartment – Cozy design, where orange-brown combined with dark wood creates a classy feeling of relaxation*

Phòng ngủ trong căn hộ Duplex Define — *Bedroom in Duplex Define apartment – central bed with iconic lounge chair and modern ceiling lighting, ideal for luxury living*

2.5. High-class WC & bathroom

The bathroom in a Duplex is often invested according to home spa standards, with double sinks, large mirrors and glass shower walls. Materials such as large-format natural stone, brushed metal and downlights create soft lighting effects, enhancing the daily relaxation experience. The combination of high-quality materials, sophisticated lighting and luxurious space organization are also elements that often appear in European interior design, which emphasizes aesthetics, comfort and classy living experience.

WC & Phòng tắm cao cấp trong căn hộ Sungrand City Duplex — *WC & Luxury bathroom in Sungrand City Duplex apartment – Sophisticated makeup corner with black stone round mirror and warm rim lighting, providing luxurious privacy*

WC & Phòng tắm cao cấp trong căn hộ Sunshine City Duplex — *WC & Luxury bathroom in Duplex Feliz apartment – Bathroom full of iridescent blue marble, with high-end double sinks and rim lighting creating a classy spa effect*

3. Typical Duplex design projects at SENDESIGN

Below are typical Duplex design projects, reflecting SENDESIGN’s unique space-creation thinking and aesthetic imprint:

[Project 1] Modern luxury: Haiphong Duplex – 2022

Located in Hai Phong, the 300m² Duplex apartment is designed by SENDESIGN in Modern Luxury style. The space stands out with its original stone wall, becoming an architectural highlight rich in depth and emotion. The combination of natural stone, warm wood and delicate metal creates a luxurious but unobtrusive overall look. The building is not only a place to live but also a symbol of love and a solid foundation for a new beginning. To realize high-end design ideas with precise perfection, the professional villa interior construction process plays an important role in ensuring the quality of materials, construction techniques and consistency between design and actual space.

Không gian sống thượng lưu tại Duplex Hoa Phượng Đỏ Hải Phòng — *Upscale living space at Duplex Hoa Phuong Do Hai Phong – impressive floor height, warm modular sofa and delicate artistic lines*

Sofa sectional nâu đỏ huyền bí kết hợp ghế lounge da hồng pastel — *Mysterious red-brown sectional sofa combined with pastel pink leather lounge chair – modern, profound living space at Duplex Hoa Phuong Do Hai Phong*

Góc nhìn từ tầng lửng: thông tầng rộng lớn, sofa boucle nâu ấm áp và đèn chùm nghệ thuật — *View from the mezzanine: large atrium, warm brown boucle sofa and artistic chandelier – Duplex Hoa Phuong Do Hai Phong*

Mảng tường đá tự nhiên chạy dọc thông tầng — *Natural stone wall running along the atrium – symbolic detail of Duplex Hoa Phuong Do Hai Phong, where SENDESIGN tells the story with materials and light*

Tường đá vân độc đáo làm nền cho sofa da nâu và ghế lounge hồng — *Unique veined stone wall as background for brown leather sofa and pink lounge chair – Duplex Hoa Phuong Do Hai Phong: perfect blend of modernity and art*

[Project 2] Style name: Xenia Sun Grand Duplex – 2022

Xenia Sungrand City Duplex is a duplex project developed by SENDESIGN in the spirit of balance and inner connection. The space is organized with soft curves throughout from the ceiling, walls to stairs, creating a seamless and relaxing feeling.

Natural light is maximized through the atrium and light curtains, bringing subtle changes at each time of day. The central highlight is the sculptural spiral staircase, combining light and warm materials to create a gentle but distinct whole.

Toàn cảnh duplex Xenia Sun Grand — *Panoramic duplex Xenia Sun Grand – the perfect connection between the living room, kitchen and iconic spiral staircase*

Vẻ đẹp cuốn hút của Xenia Duplex Sun Grand City với sofa cong mềm mại — *Looking down from above – the attractive beauty of Xenia Duplex Sun Grand City with soft curved sofas, crystal chandeliers and brilliant Christmas trees*

[Project 3] Luxury contemporary: Sungrand City Duplex – 2023

Sungrand City Duplex is a 160m² duplex apartment in Hanoi, designed by SENDESIGN in a luxury contemporary style combining organic modern spirit. The space impresses with soft curves throughout from the ceiling, walls to the kitchen island, creating a seamless and relaxing flow.

The spiral staircase serves as the central highlight as a sculpture connecting the two floors. The overall project aims for a balanced, sophisticated and sustainable living experience over time.

Đường cong nghệ thuật bao trùm không gian sống tại Duplex Sun Grand City — *Artistic curves cover the living space at Duplex Sun Grand City*

Ánh sáng pha lê lấp lánh trên trần cong gỗ, lò sưởi ấm áp và sofa boucle — *Perfect transition space with creamy white spiral staircase, herringbone floor and curved ceiling – Sungrand City Duplex masterpiece from SENDESIGN*

[Project 4] Modern luxury minimalist: Ecopark Duplex – 2024

Ecopark Duplex is a 140m² apartment in Hung Yen, completed in 2024, developed by SENDESIGN in a modern luxury minimalist style. The space has a main dark color palette such as black, dark gray, dark wood brown, combined with marble and matte black metal to create a luxurious, calm and brave look.

The atrium layout and black metal spiral staircase become a sculptural highlight, connecting the two floors in a strong but delicate way. The project aims for a private, connected and richly emotional living experience.

Không gian dark luxury đỉnh cao tại Duplex Ecopark — *The ultimate dark luxury space at Duplex Ecopark – mysterious black metal spiral staircase, genuine leather modular sofa and abstract paintings as highlights*

Tông đen huyền bí, marble óng ánh và nội thất da thật — *Mysterious black tones, iridescent marble and genuine leather interior – Duplex Ecopark brings a sense of private luxury*

Duplex Ecopark: sự hòa quyện giữa đường cong kim loại mạnh mẽ, gỗ tối màu và kính panorama — *Duplex Ecopark: a blend of strong metal curves, dark wood and panoramic glass*

[Project 5] Feliz Duplex & Penthouse – 2025

Define Duplex & Penthouse was developed by SENDESIGN as a statement about moderation and depth in high-rise living spaces. The project pursues a philosophy of minimal design intervention, prioritizing seamless surfaces, hidden doors and flush cabinetry to create a serene, unobtrusive living experience.

Materials such as dark wood, natural-grained marble and muted metals are selected to ensure both aesthetic and emotional durability. The overall vision is a space that is deep enough and flexible enough to accompany the homeowner’s lifestyle for a long time.

Không gian mở đẳng cấp tại Feliz Duplex & Penthouse — *Classy open space at Feliz Duplex & Penthouse – mysterious forest green marble kitchen island, warm boucle sofa and delicate art display shelves*

Sảnh chính ấn tượng của Feliz Duplex & Penthouse — *Impressive main lobby of Feliz Duplex & Penthouse – large circular curved ceiling, symmetrical gold metal display shelves and red abstract painting as the centerpiece*

Chi tiết kiệt tác tại Feliz Duplex & Penthouse — *Detail of the masterpiece at Feliz Duplex & Penthouse – gold metal display shelves mixed with wood, red abstract paintings and iridescent marble floors*

Khu vực bếp & ăn uống thượng lưu Feliz Duplex & Penthouse — *Feliz Duplex & Penthouse luxury kitchen & dining area – forest green marble kitchen island, walnut dining table and gray boucle chairs*

5. Core criteria in Duplex apartment design

Criterion 1: Function

With the characteristics of two floors and large area, Duplex apartments need to be strictly functionally organized right from the layout step (MBBT). The floor plan determines the indoor traffic, the connection between spaces and the level of privacy. The design should be based on the homeowner’s anthropometrics and living habits to optimize proportions, size and appropriate material selection.

Materials need to be associated with each area of use: the kitchen prioritizes easy-to-clean surfaces, the bathroom ensures moisture resistance, and the common living floor focuses on durability and safety. A true Duplex is not only beautiful when finished, but also convenient and comfortable during long-term use.

Criterion 2: Light

In Duplex design, light is not just for “seeing clearly” but for creating a living experience. It is necessary to build a lighting scenario for each space and time of day, with 3 basic layers:

Besides, purposefully selected color temperature (eg 3000 K for warm light, 4000 K for neutral light) will directly affect the user’s mood and circadian rhythm. In Duplex design, light is the factor that helps the space have depth and clear rhythm.

Criterion 3: Aesthetics

The aesthetic of a Duplex apartment does not lie in the amount of decor, but in the way the space is organized and the control of visual proportions, especially in the atrium areas. The combination of surfaces (smooth – rough, glossy – matte) and intentional colors helps create depth and shape the emotions of the space.

The most important thing is the consistency in design language – from materials, lines to lighting. A standard Duplex must harmonize functionality, aesthetics and long-term living experience.

A standard duplex design is a blend of structure, aesthetics and homeowner’s personality. When properly constructed, duplex design not only enhances living space but also brings sustainable value over time.

SENDESIGN is a general contractor specializing in the design and construction of duplex, penthouse and high-end villa projects, approaching space from the homeowner’s actual living experience to ensure progress, quality and comprehensive unity. Schedule a private consultation with a SENDESIGN expert to start the journey of creating a worthy duplex space that is sustainable over time.