Glass is no obstacle for electromagnetic radiation. Walls may give a sufficient level of protection, but the windows are extremely penetrable.
Please feel free to ask for advice for the best solution in your particular circumstance.
There is a wide range of shielding foils and paints available to us, far beyond what we can sell online. We are happy to design and arrange the best solution for you.
Our foil-installers have years of industry experience and take pride in their workmanship. Installation adds approximately $ 40 per square meter to the price.