we are Kat & Kate, founders of K+K Design. We lived and worked in many countries, Spain, Poland, Germany, USA, Holland and England, and therefore have had the opportunity to experience many different cultures. As a result of these diverse backgrounds and exposure to many different lifestyles, design and people, we became aware what people need in their everyday life.

We are originally from Poland and we always try to keep our polish heritage by working closely with polish carpenters, furniture makers, designers and builders.


Kat Fritz loves buildings, architecture, modern trends, and geometric shapes. Her education in the United States, Poland and Spain combines cultural and art studies. After obtaining her Diploma in Architecture and Interior Design from Westpomeranian Univeristy of Technology, she has worked several years in construction, mostly on commercial projects. She likes solving technical&design problems and expertises in spacious layout, furniture design and project management. 


Kasia Kazimierczak-Mrowinska loves fabric, furniture, lamps, vivid colours and the 50's design. She studied in Poland, Spain and the United Kingdom, where she obtained her Diploma in Interior Design from London School of Interior Design. She has almost 10 years of experience working for property developers and high-end residential interior design firms in Poland and in the United Kingdom. She has expertise in FF&E (Furniture, Fixtures and Equipment) schedule, colour scheme and residencial projects.

Contact: info@kplusk.design

Don't hestitate to contact us! We speak English, German, Polish and Spanish.


There are three responses to a piece of design – yes, no, and WOW! Wow is the one to aim for.

- Milton Glaser