About us

We are one of the leading producers of prefabricated concrete and are ready to serve you as a full-service frame contractor. We are building and developing future multi-family housing, offi¬ces, public buildings, industrial and agricultural buildings with our different frame concepts. Our wide product range of wall panels, foundations, floor structures, balconies, staircases, etc. offers innovative total solutions – all based on your particular project needs, requirements and preferences.

Of course, we follow, operate and take responsibility for your project all the way from concept to finished frame. We are there at every stage and perform both project planning, design, production, delivery and assembly. We do our utmost so that your project will be as secure, simple and cost-effective as possible and with the proper quality.

In January 25, 2021, K-Prefab was acquired by the real estate company K-Fastigheter. This means that the company is run further together with the existing organization, with K-Fastigheter as owner. 


In 2015 Kaj entered as CEO for K-Prefab. Concrete and construction are close to his heart and Kaj has worked his entire career in this industry. Safety, sustainability and carefree construction are what drives Kaj and K-Prefab forward. We love our concrete! It is a fast, safe and sustainable frame concept with long lifetime. Our frame concepts build the future of Sweden. K-Prefab is one of the country’s leading frame contractors.

Kaj Grönvall Finja Prefab AB


Name Kaj Grönvall
Title CEO K-Prefab AB
Age Youthful mind
Live Home by the sea
Career Worked many years for Skanska
Family Wife and three children
Leisure Loves sport, especially skiing