Get new qualifications

In 5 simple steps, you can become a WINS Certified Contractor and thus be authorised to cover your and your team's installation, sealing and insulation work on windows and balcony doors with a 20-year tightness guarantee. The guarantee covers the tightness of the joint between the frame and the reveal provided by the application of WINS systems. Confirmed by tests of the Building Research Institute (Instytut Techniki Budowlanej) and Selena.


How to obtain the guarantee?

Professional certification programme in 5 steps

  • Sign up for the one-day (paid) theoretical and practical training: Sign up for the training
  • Execute the installation under the supervision of a WINS instructor.
  • You will receive a personal installer's certificate. The certificate is numbered. Upon receipt, you must create your WINS account at
  • You can register the installations in the Selena database via your WINS account at and issue installation certificates.
  • Update the certificate every 5 years (on-line)