Interior design companies in Pennsylvania provide a blend of aesthetics and functionality, reshaping spaces across various sectors. These firms range from small, boutique operations to larger, established companies, offering services such as architectural design, space planning, and interior styling. A growing focus on sustainability and user-centric solutions is driving the industry forward, as these companies increasingly innovate ways to create environments that enhance well-being and efficiency. The convergence of technology and design, particularly in using virtual reality and sustainable materials, is reshaping how these firms approach projects. Industry collaborations are becoming more prominent, allowing them to tackle larger, more complex designs.

The companies listed here range in size from small teams to mid-sized firms, all with headquarters in iconic Pennsylvania cities such as Philadelphia and Pittsburgh. Established from 1948 to 2019, these firms showcase a variety of specializations, including healthcare, education, and hospitality design. Many prioritize sustainability and innovative solutions. With a concentration of firms focused on strategic partnerships and quality service, Pennsylvania's interior design sector continues to grow and adapt to the ever-evolving needs of its clients.

Continue reading to discover notable interior design companies in Pennsylvania.

Top 22 Interior Design Companies in Pennsylvania

1. LGA Partners

• Website: lga-partners.com
• Ownership type: Private
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1993
• Headcount: 51-200
• LinkedIn: lga-partners

LGA Partners is an architecture and design consultancy based in Pittsburgh, Pennsylvania, founded in 1993. The firm specializes in innovative design solutions across multiple sectors, including aviation, education, healthcare, and retail. With a team of over 90 professionals, LGA Partners combines architectural expertise with interior design services, ensuring that each project meets the specific needs of their clients. They have completed more than 12,000 projects, demonstrating their extensive experience and commitment to quality. The firm has received recognition for its work, including awards for historic preservation and social impact in design. LGA Partners operates with a client-centered approach, focusing on building meaningful partnerships and delivering high-quality service throughout the design process.

2. NEXT architecture

• Website: next-architecture.net
• Ownership type: Private
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2003
• Headcount: 11-50
• LinkedIn: next-architecture

NEXT architecture is a private architecture and interior design firm based in Pittsburgh, Pennsylvania, with a secondary office in Tampa, Florida. Founded in 2003, the firm has built a reputation for delivering innovative and customized design solutions across various sectors, including commercial, educational, and healthcare. With a team of 11 to 50 employees, NEXT architecture prides itself on its collaborative approach, ensuring that client needs and preferences are at the forefront of every project. Their services range from strategic planning and programming to project management and furniture selection. The firm has successfully completed numerous projects, demonstrating its commitment to quality and client satisfaction. Their work reflects a strong understanding of space and functionality, making them a notable player in the interior design industry.

3. Designblendz

• Website: designblendz.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2011
• Headcount: 11-50
• LinkedIn: designblendz

Designblendz is a Philadelphia-based architecture and design consultancy founded in 2011. With a team of 27 professionals, the company offers a wide range of services, including architectural design, interior design, and 3D visualization. They cater to various sectors, such as residential, commercial, healthcare, and hospitality, focusing on creating innovative and functional spaces that meet client needs and regulatory standards. Designblendz emphasizes collaboration and client engagement throughout the design process, ensuring that projects reflect the unique identity and lifestyle of their clients. Their commitment to quality is evident in their portfolio, which showcases a variety of successful projects. The firm has also been recognized for its work, receiving accolades like the 2024 Preservation Achievement Award, highlighting their impact in the industry.

4. Strada | Design with People in Mind

• Website: stradallc.com
• Ownership type: Private
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2000
• Headcount: 51-200
• LinkedIn: strada-architecture-llc

Strada | Design with People in Mind is a private design firm based in Pittsburgh, Pennsylvania, founded in 2000. With a team of approximately 123 employees, Strada specializes in architecture, interior design, and landscape architecture. The firm is dedicated to creating meaningful experiences through its design work, emphasizing a collaborative approach that involves immersive discovery with clients. Strada's services include programming, space planning, color and material selection, and custom furniture design, among others. Their portfolio features a range of projects, including adaptive reuse of historic buildings and innovative spaces for educational institutions and businesses. Strada is committed to sustainability and wellness, integrating these principles into their designs to enhance the quality of life for users. They operate studios in Pittsburgh, Philadelphia, and Chapel Hill, allowing them to engage with various communities and understand local needs. Strada's focus on human-centered design and their active involvement in the industry through community outreach and educational initiatives further solidify their position as a relevant player in the interior design field.

5. Fca

• Website: fcarchitects.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 95%, Brazil 3%, Other 2%
• Founded year: 1954
• Headcount: 51-200
• LinkedIn: fcarchitects

FCA, founded in 1954, is an architectural firm based in Philadelphia, Pennsylvania, specializing in design and planning services. The company offers a range of services that include architecture, interior design, master planning, and medical equipment planning. FCA primarily serves clients in the healthcare, corporate, and educational sectors. Their approach emphasizes collaboration, aiming to create innovative and sustainable spaces that enhance the user experience. With a workforce of over 150 professionals across multiple offices in the United States, FCA is licensed to operate in 37 states and has a practice footprint that extends to national and international projects. The firm has a strong focus on client relationships, boasting an impressive 83% repeat business rate, indicating a high level of client satisfaction and trust. Their portfolio includes notable projects such as healthcare facilities and corporate headquarters, showcasing their expertise in interior design and architecture.

6. R3A Architecture

• Website: r3a.com
• Ownership type: Private
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1994
• Headcount: 11-50
• LinkedIn: renaissance-3-architects-p-c-

R3A Architecture, founded in 1994 and based in Pittsburgh, Pennsylvania, is a private architecture firm that specializes in human-centered design solutions. With a team of 32 employees, R3A provides a range of services including architectural design, interior design, and planning. The firm primarily serves educational institutions, community organizations, and businesses, focusing on creating innovative and sustainable spaces that enhance user experience. R3A has completed over 100 projects in collaboration with notable clients such as Carnegie Mellon University and the University of Pittsburgh. Their commitment to design excellence is reflected in their receipt of more than 40 awards, recognizing their contributions to architecture and interior design. R3A's approach emphasizes collaboration and understanding client needs, ensuring that their designs are not only functional but also enriching for the end-users.

7. Desmone

• Website: desmone.com
• Ownership type: Family Owned
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1958
• Headcount: 11-50
• LinkedIn: desmone-%26-associates-architects

Desmone is an architecture firm based in Pittsburgh, Pennsylvania, founded in 1958. The company specializes in design services that prioritize health and wellness, serving a range of clients from businesses to residential projects. With a team of 11-50 employees, Desmone has developed a reputation for creating functional and visually appealing spaces. Their work spans various sectors, including hospitality, education, and residential, showcasing their adaptability and expertise in interior design. The firm has received recognition for its innovative designs, including awards for interior architecture and sustainable building practices. Desmone's office expansion achieved WELL Gold Certification, highlighting their commitment to health-focused design. They operate additional offices in Morgantown, West Virginia, and Cleveland, Ohio, further extending their reach in the region.

8. DAS Architects, Inc.

• Website: dasarchitects.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1990
• Headcount: 11-50
• LinkedIn: das-architects

DAS Architects, Inc., founded in 1990 and based in Philadelphia, Pennsylvania, is an architecture and design firm that specializes in creating immersive experiences through innovative architectural and interior design solutions. The firm serves clients primarily in the hospitality and retail sectors, offering a comprehensive range of services that include master planning, building architecture, interior design, and custom furnishings. DAS Architects emphasizes collaboration with clients, ensuring that their visions are brought to life in a way that reflects their needs and desires. The firm has developed a strong portfolio, having worked on over three hundred signature projects, including hotels, restaurants, and luxury residential spaces. Their work has been recognized in various industry publications, highlighting their impact and presence in the design community. DAS Architects also operates an affiliate, Studio DAS, which focuses on custom furnishings and artwork, further enhancing their design offerings.

9. Maria Joan Design Group

• Website: mariajoan.com
• Ownership type: Family Owned
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Founded year: 2019
• Headcount: 1-10
• LinkedIn: mcdesignsource

Maria Joan Design Group, based in Philadelphia, Pennsylvania, is a family-owned design firm founded in 2019 by Maria Kunkulis Malone. With over 20 years of experience in the design industry, Maria has cultivated a strong understanding of both the creative and practical aspects of interior design. The firm specializes in architectural and interior design services, offering a range of solutions including programming, space planning, visualization, and specifications. They represent high-end manufacturers of furnishings and finishes, catering to clients in commercial, healthcare, hospitality, and education sectors. The company is committed to providing tailored design solutions that meet the unique needs of each client, ensuring that every project reflects quality and luxury. Maria Joan Design Group operates primarily in Eastern Pennsylvania, Southern New Jersey, and Delaware, establishing a solid presence in the regional market.

10. IEI Group, Ltd.

• Website: ieigroup.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 66%, Nigeria 34%
• Founded year: 1991
• Headcount: 11-50
• LinkedIn: iei-group-ltd.

IEI Group, Ltd., based in Philadelphia, Pennsylvania, is an architecture and interior design firm founded in 1991. With a team of 35 employees, the company focuses on delivering high-quality design solutions tailored to the needs of its clients. IEI Group serves a variety of sectors, including corporate offices, government facilities, educational institutions, healthcare environments, and retail spaces. Their services include architecture, interior design, project management, and sustainability consulting. The firm is recognized for its commitment to sustainability, having been named in Interior Design Magazine's 2023 Sustainability Giants List. IEI Group has also received accolades such as the PSMJ Circle of Excellence Award and is WBENC certified, highlighting its dedication to excellence and community engagement. Their portfolio features notable projects like the Curtis Institute of Music and various healthcare facilities, reflecting their expertise in creating functional and innovative spaces.

11. PZS Architects

• Website: pzsarchitects.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1993
• Headcount: 11-50
• LinkedIn: pzs-architects

PZS Architects, founded in 1993 and based in Philadelphia, Pennsylvania, is a private architecture firm with a focus on designing spaces that inspire and serve communities. With a team of 26 employees, the firm has built a reputation for its work in educational, healthcare, and community projects. PZS Architects offers a range of services, including architectural design, interior design, and master planning. They are known for their commitment to sustainability, integrating energy-efficient practices and materials into their designs. The firm has received several awards for its projects, highlighting its impact in the industry. PZS Architects actively engages with the communities they serve, ensuring that their designs reflect the needs and aspirations of the users. Their portfolio showcases a variety of projects, including schools, hospitals, and community centers, demonstrating their expertise in creating functional and aesthetically pleasing environments.

12. mossArchitects

• Website: mossarc.com
• Ownership type: Private
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2006
• Headcount: 11-50
• LinkedIn: mossarchitects

mossArchitects is a private architecture and design firm based in Pittsburgh, Pennsylvania, founded in 2006 by Andrew Moss. With a team of 22 professionals, the firm specializes in crafting innovative and functional spaces tailored to the needs of its clients. Their portfolio spans residential, commercial, and community projects, showcasing a commitment to enhancing the quality of life through thoughtful design. mossArchitects prides itself on a collaborative approach, working closely with clients to ensure that each project reflects their vision and requirements. The firm has garnered attention for its adaptive reuse projects, demonstrating a dedication to sustainable design practices and community revitalization. Over the years, mossArchitects has received numerous awards, including honors from AIA Pittsburgh and recognition in various publications, highlighting their impact in the architecture and design industry.

13. Charles Matsinger Associates

• Website: matsinger.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1986
• Headcount: 11-50
• LinkedIn: charles-matsinger-associates

Charles Matsinger Associates, based in Philadelphia, Pennsylvania, has been a player in the architectural and interior design field since its founding in 1986. The firm offers comprehensive services that include architectural, interior, and sustainable design. With a team of experienced professionals, they prioritize understanding client goals from multiple perspectives—functional, aesthetic, and financial. Their portfolio showcases a range of projects across various sectors, such as healthcare, finance, and education, highlighting their ability to create tailored design solutions. The firm is known for its client-centric approach, which fosters long-term relationships and ensures that projects not only meet but often exceed expectations. Their commitment to quality and innovation has established them as a respected name in the industry.

14. RLPS Architects

• Website: rlps.com
• Ownership type: Private
• Headquarters: Lancaster, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1954
• Headcount: 51-200
• LinkedIn: rlps-architects

RLPS Architects, founded in 1954 and based in Lancaster, Pennsylvania, is a private architecture firm that specializes in architectural, master planning, and interior design services. With a team of approximately 106 employees, the firm focuses on sectors such as education and senior living, aiming to create functional and sustainable environments. RLPS Architects collaborates closely with clients to understand their unique needs, ensuring that each design solution is tailored to enhance the user experience. Their portfolio includes a variety of projects, from educational institutions to senior living communities, showcasing their expertise in both architecture and interior design. The firm is committed to integrating sustainable practices into their designs, reflecting a modern approach to architecture and interior spaces. They also emphasize the importance of stakeholder engagement in their design process, which helps to create spaces that resonate with the communities they serve.

15. KMA Design Studio

• Website: kma-studio.com
• Ownership type: Private
• Headquarters: Ambler, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1977
• Headcount: 51-200
• LinkedIn: kramer-marks-architects

KMA Design Studio, based in Ambler, Pennsylvania, is an architectural firm that has been providing architectural and interior design services since its founding in 1977. With a team of approximately 80 professionals, KMA emphasizes a holistic approach to design, ensuring that they meet the unique needs and challenges of their clients throughout the project lifecycle. The firm serves a wide range of clients, including residential, municipal, and commercial sectors, and is known for its commitment to sustainability and innovative design. KMA has successfully completed numerous projects, with over 90% of their work being built, which speaks to their reliability and effectiveness in project execution. Their portfolio includes notable projects such as the conversion of historic buildings into modern spaces and the development of affordable housing, demonstrating their versatility and social responsibility. KMA has also received various awards and certifications for their work, further solidifying their reputation in the industry.

16. D2 Groups

• Website: d2groups.com
• Ownership type: Private
• Headquarters: King Of Prussia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 97%, Colombia 3%
• Founded year: 2004
• Headcount: 51-200
• LinkedIn: d2groupsandd2branding

D2 Groups LLC, based in King of Prussia, Pennsylvania, is a private design and engineering firm founded in 2004. With a team of approximately 70 employees, the company specializes in architecture, interior design, branding, and MEP engineering. D2 Groups serves a variety of sectors, including healthcare and corporate environments, providing tailored solutions that enhance both functionality and aesthetics. Their collaborative approach ensures that client needs are met through strategic design and implementation. The firm has undertaken notable projects, such as the Wills Eye Hospital Glaucoma Suite and the adaptive reuse of a vacant building into Race Street Labs, demonstrating their capability in transforming spaces to meet modern demands. D2 Groups emphasizes the importance of design as a strategic advantage, believing that well-considered environments can significantly impact user experience and business outcomes.

17. Diversified Design

• Website: diversified-design.com
• Ownership type: Private
• Headquarters: Lititz, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1983
• Headcount: 1-10
• LinkedIn: diversified-design

Diversified Design is a private design firm based in Lititz, Pennsylvania, specializing in architectural interiors. Established in 1983, the company has built a reputation for delivering tailored design solutions that enhance both the functionality and aesthetics of spaces. Their service offerings include interior design, project management, space planning, and custom residential design, among others. The firm has worked across various sectors, including commercial, healthcare, education, and senior living, demonstrating their versatility and ability to cater to different client needs. With a small team of dedicated professionals, Diversified Design emphasizes understanding client requirements in detail, ensuring that each project reflects the client's vision while adhering to budgetary constraints. Their portfolio showcases a range of successful projects, indicating their active involvement in the industry and commitment to quality design.

18. BLTa-A Perkins Eastman Studio

• Website: blta.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Founded year: 1961
• Headcount: 51-200
• LinkedIn: blt-architects

BLTa-A Perkins Eastman Studio, based in Philadelphia, Pennsylvania, is a private architecture and design firm founded in 1961. The studio is part of Perkins Eastman, which operates globally and specializes in creating innovative environments across multiple sectors, including healthcare, education, and hospitality. The firm offers a comprehensive suite of services, including campus planning, interior design, and branded environments. Their approach emphasizes sustainability and user experience, ensuring that the spaces they design are not only functional but also promote well-being. With a team of skilled interior designers, the studio integrates architecture and interior design to create unique narratives within their projects. Their work spans various markets, showcasing their ability to adapt to different client needs and project requirements.

19. Voith & Mactavish Architects LLP

• Website: voithandmactavish.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1988
• Headcount: 11-50
• LinkedIn: voith-%26-mactavish-architects-llp

Voith & Mactavish Architects LLP is a Philadelphia and New York-based architecture firm founded in 1988. With a team of around 40 architects, planners, and designers, the firm specializes in innovative design solutions across multiple sectors, including education, culture, and corporate environments. They are recognized for their commitment to sustainability and the creation of spaces that are not only functional but also resonate with the heritage and values of their clients. The firm has a strong focus on collaboration, ensuring that each project reflects the unique mission of the organizations they work with. Voith & Mactavish has received various awards for their projects, highlighting their expertise in both architecture and interior design. Their portfolio includes notable projects such as the Sipprelle Field House at St. Andrew’s School and the Business Innovation Building at Lehigh University, showcasing their ability to blend modern design with traditional elements while addressing contemporary needs.

20. SAAarchitects, Inc.

• Website: saaarchitects.com
• Ownership type: Private
• Headquarters: York, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1996
• Headcount: 1-10
• LinkedIn: saaarchitects-inc-

SAAarchitects, Inc., based in York, Pennsylvania, is an architectural firm founded in 1996. With a small team of around 21 employees, the company specializes in a range of design services, including architectural and interior design, green and sustainable design, and historic preservation. They cater to various sectors, such as commercial, healthcare, hospitality, and private residences, providing customized solutions that enhance both functionality and aesthetics. SAAarchitects emphasizes a collaborative design process, ensuring that client input is integral to their projects. Their portfolio showcases a commitment to quality and innovation, reflecting over 25 years of experience in the industry. The firm has not reported any funding, indicating a self-sustained operational model.

21. CosciaMoos Architecture

• Website: cosciamoos.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2010
• Headcount: 11-50
• LinkedIn: coscia-moos-architecture

CosciaMoos Architecture, founded in 2010 and based in Philadelphia, Pennsylvania, is a private architecture firm that specializes in innovative design solutions across multiple sectors, including healthcare, commercial, and educational facilities. With a team of 34 professionals, the firm is committed to creating spaces that are not only functional but also enhance user experience. Their Interiors Studio focuses on translating client visions into tangible designs, offering services such as space planning, FF&E selection, and branding. The firm has received recognition for its work, including several awards for projects that highlight their commitment to quality and design excellence. Recently, CosciaMoos merged with BBLM Architects, combining strengths to provide a broader range of design services, particularly in healthcare, which reflects their adaptability and growth in the industry.

22. BDA Architects, LLC

• Website: bdaarchitects.com
• Ownership type: Family Owned
• Headquarters: Clarks Summit, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1948
• Headcount: 11-50
• LinkedIn: bdaarchitects

BDA Architects, LLC, based in Clarks Summit, Pennsylvania, is a family-owned architecture firm with a rich history dating back to 1948. With a workforce of approximately 29 employees, the firm has carved out a niche in healthcare design, providing architectural and interior design services tailored specifically for healthcare providers. Their portfolio includes a variety of projects such as hospitals, medical office buildings, and specialized healthcare facilities. BDA Architects prides itself on its collaborative approach, ensuring that client needs are met through customized design solutions. The firm has maintained long-term relationships with numerous healthcare systems, with about 90% of their projects coming from repeat clients. This reflects their commitment to quality and client satisfaction. BDA Architects also emphasizes the importance of interior design in creating spaces that promote healing and efficiency, making them a significant player in the healthcare architecture sector.

Interior Design Insights: Key Companies in Pennsylvania

Company	Headquarter	Size	Founded	Ownership
LGA Partners	Pittsburgh, Pennsylvania, United States (USA)	51-200	1993	Private
NEXT architecture	Pittsburgh, Pennsylvania, United States (USA)	11-50	2003	Private
Designblendz	Philadelphia, Pennsylvania, United States (USA)	11-50	2011	Private
Strada | Design with People in Mind	Pittsburgh, Pennsylvania, United States (USA)	51-200	2000	Private
Fca	Philadelphia, Pennsylvania, United States (USA)	51-200	1954	Private
R3A Architecture	Pittsburgh, Pennsylvania, United States (USA)	11-50	1994	Private
Desmone	Pittsburgh, Pennsylvania, United States (USA)	11-50	1958	Family Owned
DAS Architects, Inc.	Philadelphia, Pennsylvania, United States (USA)	11-50	1990	Private
Maria Joan Design Group	Philadelphia, Pennsylvania, United States (USA)	1-10	2019	Family Owned
IEI Group, Ltd.	Philadelphia, Pennsylvania, United States (USA)	11-50	1991	Private
PZS Architects	Philadelphia, Pennsylvania, United States (USA)	11-50	1993	Private
mossArchitects	Pittsburgh, Pennsylvania, United States (USA)	11-50	2006	Private
Charles Matsinger Associates	Philadelphia, Pennsylvania, United States (USA)	11-50	1986	Private
RLPS Architects	Lancaster, Pennsylvania, United States (USA)	51-200	1954	Private
KMA Design Studio	Ambler, Pennsylvania, United States (USA)	51-200	1977	Private
D2 Groups	King Of Prussia, Pennsylvania, United States (USA)	51-200	2004	Private
Diversified Design	Lititz, Pennsylvania, United States (USA)	1-10	1983	Private
BLTa-A Perkins Eastman Studio	Philadelphia, Pennsylvania, United States (USA)	51-200	1961	Private
Voith & Mactavish Architects LLP	Philadelphia, Pennsylvania, United States (USA)	11-50	1988	Private
SAAarchitects, Inc.	York, Pennsylvania, United States (USA)	1-10	1996	Private
CosciaMoos Architecture	Philadelphia, Pennsylvania, United States (USA)	11-50	2010	Private
BDA Architects, LLC	Clarks Summit, Pennsylvania, United States (USA)	11-50	1948	Family Owned

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