Get to know about us

Our Story

KAST-design is an interior design and 3D visualization agency founded by Karolina Sterkowicz, in 2013. In 2016, Kasia joined Karolina in the management of KAST-design. Magda joined the KAST design team in 2017.

Originally specializing in the decoration and renovation of flats, KAST has diversified to also work on public spaces such as offices and restaurants.

The multicultural profiles of the three partners give KAST-design the particularity of being operational on multiple international projects (France, Germany, Poland, Switzerland…). The training of Karolina, Kasia and Magda also gives the three architects the ability to carry out all aspects of a project, from creation and photorealistic visualization to interior design and delivery to site and execution details.

Recognizing that each project is unique, KAST-design’s bespoke service is designed to be as comprehensive as possible. Karolina, Kasia and Magda have created a network of partners, including craftsmen and furniture suppliers, as well as artists and photographers.



Founder / Architect

Karolina is the founder of the Kast-Design agency. Specialised in 3D visualisations, she loves to take up challenges on atypical spaces. Her creativity allows her to create original and diverse interiors. As an architect with degrees from the Polytechnic School of Krakow and Belleville in Paris, her experiences have forged her convictions. After more than six years of experience in architecture and interiors in France and Poland. Fascinated by design and material research, she loves to travel and gain experience. Can advise you in French, Polish and English.



Founder / Architect

Kasia joined Kast design in 2016. Specialising in the redesign of plans and spaces, her professionalism is matched only by her attention to technical detail. A former Renzo Piano Building Workshop architect, Kasia is a graduate of the University of Münster and the Kraków Polytechnic. With more than 7 years of experience in large-scale architectural projects in France, Germany and Poland, she loves to look for small accessories and light concepts that make a space more cosy. Can advise you in German, Polish, French and English.



Founder / Architect

Magda graduated in architecture and urban planning from the Krakow Polytechnic with RIBA Part II accreditation from the Royal Institute of British Architects. She gained experience as an architect for eight years, working in Germany, Poland, Ireland and the United States, before coming to Paris in 2012 to enrich her career in interiors. Her communication and interpretation skills have enabled her to accompany many international companies in their renewal projects. Meticulous and diligent, she strives to create a design that is both functional and visionary, for an extraordinary result.




Interior designer

After 3 years of experience in the US, Charlotte joins the team in 2021. Can advise you in French and English.



Interior designer

From Poland, Dorota is involved in the design process. She joined KAST DESIGN in 2016.



Interior designer

Graduated from architecture school, Sarah joined the team in 2020.


Marketing Assistant

Assma is a student in Business Development and Marketing and participates in marketing actions for the development of the agency.



Interior designer

Graduated from architecture school, Romane joined the team in 2021.



Interior designer

Graduated from the Nantes Atlantique Design School, Maud joined the team in 2022.

Notre Agence

6, rue de Douai 75009 Paris


E-mail :

Fixe : 01 40 18 45 24
Karolina : +33 6 52 90 80 74
Kasia :  + 33 7 81 44 06 67
Magda :  + 33 6 01 1 4 1 8 97


KAST DESIGN sur Paris, FR sur Houzz
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