Following are the fields allied with interior design:

Architecture

When an architect creates a building or a residential complex or a township or a complete city, for that matter, it no longer remains a built property, but a living experience and sociological, technical and cultural expression of that place. If you have it in to be the next Charles Correa or Le Corbussier, then you must pursue a degree in architecture.

Interior Design

As an interior decorator, you plan the living space for individuals to interact and vibe with each other. You plan the furniture, flooring, textures, wall surfaces, colors, light effects, ornamental effects. You also plan electrical circuits and installations, air conditioning, aeration, drainage and water supply.

Landscape Architect

A landscape architect is a person involved in the planning, design and sometimes direction of a landscape, garden, or distinct space. S/he could be involved at various levels towards developing new or improved theories, policy and methods for landscape planning, design and management, to promote environmental awareness and undertaking planning, design, restoration, management and maintenance of cultural and/or historic landscapes, parks, sites and gardens, while contributing to the planning, aesthetic and functional design, location, management and maintenance of infrastructure such as roads, dams, wind farms and other energy and major development projects.

Industrial Design/ Product Design

While designing products is as old as the human civilization, with the advent of the industrial revolution, and an era of rapid social, technological and cultural transformations, a product designer must be particularly concerned with those aspects of products that relate to human usage and behaviour, and product appeal and based on creative and practical concerns of maximum relevance involving issues that are local and global simultaneously.

You will explore solutions to meet marketing, manufacturing and financial requirements and arrive at the optimum design of a product. You will consider both functional and aesthetic aspects, with a specials attention to ergonomics. You could serve the industry, design or architectural studio, while designing products that re user-friendly and provide sustainable solutions to the consumer.

TV, Film & Theatre Set Design

As a set designer for TV, film or theatre, a set designer decides the visual language and imagery in accordance with the vision of the director and demand of the script. Also called as a production designer, you will be responsible for studying scripts and discussing ideas with the director, researching details for the production, communicating ideas to costume, make-up, props and lighting designers and supervising costs and set building.
You must be have imagination, creativity and excellent communication skills, excellent visual awareness, drawing and design skills, an understanding of camera and lighting and a keen interest in cultures, lifestyles and historical periods.

Museum Design

One of the important parts of spatial design, museum design communicates about a certain historical phenomenon or figures, through a series of immersive spatial experiences that are rich in 2 D and 3 D sets, audio, video and multimedia, graphics, et al.
As a museum designer, you must have keen interest in historical and cultural phenomena and the ability to visualize the past, to be able to evoke the right kind of emotion in the visitor in the space.

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Exhibition Design

As an exhibition designer, you plan, design, organize and install the layout, construction, installation of pavilions, thematic zones, etc in expos, trade fairs, exhibitions, et al.
As grow in your career graph, you could also design and make permanent shop displays, museum exhibits and interpretive displays.
This is a multi-disciplinary field, as it draws from architecture, graphic design, industrial design, film, photography and audio-visual, into a common language resolving the communication through spatial expression to attract, inform and involve an audience in the subjects that their clients employ them to present.
Besides the capacities of imagination and creativity, a deeper understanding and passion of and for space is an essential.

Retail Design

Retail design is a creative and commercial discipline that combines several different areas of expertise together in the design and construction of retail space. Retail design is primarily a specialized practice of architecture and interior design, nevertheless, it also involves practices and elements of industrial design, graphic design, ergonomics, and advertising. The importance of lighting, flooring and comfort for the consumer to walk around and experience the products on display, must be understood very clearly by the retail designer.

Visual Merchandising

Through the presentation of the products display in stores, for the sake of promoting the sale of goods, is the purview of Visual Merchandising. A part of retail design, the work involves creating displays including color, lighting, space, product information, sensory inputs (such as smell, touch, and sound), as well as technologies such as digital displays and interactive installations.
Your role as a visual merchandiser could be very crucial to increase store traffic and sales volume. You have to updated, very proactive and creative in your ideas, in order to be a successful visual merchandiser.

Lighting Design

Lighting design is a very specialized field in the vast field of interior design and has gained tremendous significance in the recent years, both creatively and commercially. The lighting designer must keep in mind the space for which the lighting is done (theatre or office or restaurant or residence), the different intensities of light during day and night, and variations during seasons, in order to play with them.

Acoustic Design

Acoustic design is the design of the sound. With spaces increasingly being treated as experiential rather than living, sound design plays an important role. As an acoustic designer/ engineer, you must be a lover of technology and have a desire to create new technology which will provide the ultimate listening / processing / recording / etc experience.
You will create the plan for performance spaces like concert halls as well as recording studios, and any other space that needs to provide a quality listening environment, in this profession.

Automobile Interior Design

Automobile interior design is largely concerned with the development of interiors of road vehicles. As such a kind of designer, you handle and enhance the visual appearance or aesthetics of vehicles- both interiors and exteriors, as well as color and trim designs of vehicles. You must also be able to understand aerodynamics, engineering concepts, ergonomics, along with working knowledge of maths and numbers.

Urban Design

As the world moves towards mega cities as epicenters of civilization, urban design is a filed of large scope. With the expansion and contraction of the cities and the intricate cultural and economic exchange at theses urban centres, newer forms of analysis and design are required. The subject aims to tackle problems of sustainability and the need to address a multiplicity of scales and a diversity of populations, the analysis of formal and informal systems of urban development and global/local economies and finance etc , towards making the cities a better place and experience to live in.