Niels V. 5,0 11 Apr 2026 Google

I am very satisfied with this company, they did an excellent job. We had many double-glazed windows replaced by HR++. They took all the time in advance to make an inventory and they thought along about the possibilities. The work itself was carried out as agreed and with minimal inconvenience. Very pleasant to deal with and delivered an excellent result. They also keep their agreements: when they say you will be called back, they really do. I can recommend this company to everyone! If we ever need to replace a window, I will definitely come back to them. Good price and good service by a top team.

Jos Kragtwijk 5,0 11 Apr 2026 Google

Koster-Sellen replaced the bubble glass on seven of our windows. A three-man operation, a well-oiled machine, working efficiently both indoors and outdoors. They provided us with excellent advice beforehand. We are very satisfied.

Wouter van Dam 5,0 11 Apr 2026 Google

Koster-Sellen Glas Service replaced a frame window for us, and the process went excellently. From the first contact, they provided expert advice, adhered strictly to the agreements, and worked neatly and skillfully. The installation went smoothly, leaving no mess behind, and the end result is perfect. For a reliable and professional glazier in North Holland, I absolutely recommend Koster-Sellen Glas Service!

Carla van den Haak 5,0 11 Apr 2026 Google

Koster Sellen Glas replaced six old double-glazed windows with HR++ windows for us in April. They did it quickly and efficiently, and the staff are friendly and helpful. They work very neatly both inside and outside the house. They also replaced the bottom glazing bead on a window on the same facade, so everything looks the same. A top-notch team.