What to check in every quote

In Ermogon you can name the primary material supplier and series, or leave “No preference” (the default). If you set them, check that every quote or reply writes the same names, not only aluminium. If you left “No preference”, the quote must still name them. The series changes weight, insulation and price. Without the same series you are comparing nothing. If either is missing from the PDF, ask for it to be added in writing. For example names, see the known suppliers and the frame series examples.

Each quote states how many days until delivery or completion. Before you accept, compare that number with your own schedule. It is a commitment from the business to you, not from Ermogon. A cheaper quote with a much longer delivery window may still not work for you.

How reliable a business is shows in ratings (stars and comments) from other customers on the platform, where you choose who receives the request. A business may turn ratings off. That already shows on the recipient selection step before you send the request, with a note that they do not accept ratings. More on Ratings and customer profile.

Check whether it is double or triple, the thickness, whether it has a low-e coating, whether it has argon between the panes and whether it has a warm-edge spacer. Ask for the glazing figure (Ug). The cheap trick is simple double glazing with no coating and no argon.

The glass is only the pane. Ask for the Uw: the thermal transmittance of the whole window (frame and glass together), calculated for your exact size. A lower Uw means less heat loss.

It is not enough to say it has a thermal break. Ask how many millimetres it is (polyamide width). A wider break costs more and insulates better.

This is not the frame profile or series. It is the parts that open, lock and tilt. Ask for the brand and type. Simple or perimeter, how many locking points, with tilt or without. This is one of the biggest hidden price gaps.

Ask for a certified finish. If you live near the sea, ask expressly for the seaside grade.

Check whether they are included and what exactly. Ask whether the roller box is insulated and the slat (lamella) thickness. An uninsulated box ruins the insulation of the whole window.

Ask whether it includes removal of the old frames, disposal, making good and sealing the joint. Also ask about transport or carrying up to a floor.

Check whether VAT is included or excluded and the payment terms.

Ask for the declaration of performance with the CE mark, the air, water and wind ratings, and a written warranty with its duration. Not every business declares certificates on the platform. Ask in writing for anything missing from the quote.

Whoever writes down every material in detail looks more expensive. Whoever writes only a total may have left out things you will pay for later.