Frequently asked questions

Often yes, especially if the window is over 10 years old and the seal has never been replaced. But not always. First we check whether the cause is the seal, the closing pressure or something else. If the seal won't help, we say so before the work, not after.

Seal replacement costs €7/m, or €10/m for a seal recessed into the frame. Material and replacement labour are included. We count the actual length of every seal run being replaced. The call-out fee is separate.

No. The window stays in place, the glass unit stays in. The work is done on site, replacing one sash takes about half an hour.

Q-Lon is a Schlegel composite seal with a polyurethane foam core, polyethylene skin and stabilising carrier. The manufacturer publishes recovery and weathering test data. The right profile and installation are essential for a well-sealed window.

Sometimes yes, sometimes no. Condensation forms when warm air meets a cold surface. Poor sealing can worsen it, then sealing helps. If the main cause is humidity, ventilation needs improving first.

In Tallinn and Harjumaa usually within a few days. Describe the problem and we'll tell you the earliest we can come.