We can produce a free cost estimate for window replacement in your house.
In addition to saving energy, there are many other benefits to changing windows. We can also offer digital home visits where we tell more about our windows and how a window replacement is done.
Fill in the form and we will contact you and tell you more.
If you choose products with a low u-value, you save energy. It is also important that the door or window frame is tightly sealed if it is to deliver what it promises. In addition to leading thermal insulation properties, Ekstrands has also tested the airtightness of its double doors and windows. Whichever product you choose from Ekstrands, you can be sure that the product delivers what it promises.
A majority of all energy-efficient windows marketed in Sweden have a development value of around 0.9-1.2 W/(m²K). Options are often required to get below 1.0. Ekstrands has windows from U-value 0.77W/(m²K)
We offer professional installations with our own carpenters. Book a free window measurement from us!
We also offer digital home consultations with video calls. If you would rather send pictures, it works just as well. In most cases, we can make a quote without physically measuring all the windows and doors.
Ekstrands has a modern production structure based on JIT-planning philosophy. All products are manufactured in millimeter sizes to order, there are no products in stock. The advantage is total flexibility for our customers, each window can be adapted exactly to the customers conditions. In addition to this, we have twelve window systems with a large selection of materials, options, color and shape. We have created cost-effective windows with high quality, adapted to the unique conditions that each client has.
Our folding windows have strong constructions and advanced fitting systems which allow large areas to be opened up.
Ekstrands offer several different systems of sliding windows with the latest in sliding door technology, both as 2-sash or 4-sash in large sizes
There are a plethora of options for balcony doors. We can make both classic or more modern doors. Read more about our different balcony doors
Ekstrands manufacture exclusive wood products with a high technological level and market-leading performance. Our oak windows are unique and a result of our efforts to find long-term sustainability in combination with high performance and low maintenance. Read more about how we use solid wood.
The U-value indicates how well a product insulates (keeps heat and cold out). The lower the U-value, the better the product insulates. What defines a good U-value depends entirely on where the window should be located. In old houses where walls and roofs leak a lot of energy, the U-value around 1.0 - 1.3 is enough to increase comfort indoors. If, on the other hand, you build a passive house that is to be self-sufficient, the U-value should fall below 0.80.
For windows, Swedish P-marking requires that the value be declared, thus no specific requirement for thermal insulation. SFDK requires ≤ 2.0W/m²K.
The G-value shows how much energy is transferred through direct solar radiation. The higher the value, the more energy and thus heating it generates (windows account for about 30% of heating in houses).
To think about here is how much heating you want through windows to the house. If you have large glass surfaces in dense newly built houses, it can be good to look at a lower G-value so that you do not have to cool down the house on hot sunny days. Also think about the location of the window in the latitude, and how much solar energy reaches the window.
The daylight transmittance is stated as a percentage and is a measure of the amount of daylight that enters through the window. A high daylight transmission is preferable, then it is experienced brighter.
Safety against wind load is stated from A1 to C3. Wind load is tested in two steps. Frame deformation is stated in class A-C where C is best. Indicated in combination with pressure class 1-3 depending on how hard the product has been tested under, where 3 is highest in Sweden. For class 3 it is 1200 pascals. After that, you finish with a safety test with 1.5x higher pressure (1800 pascals for class 3).
Rain density measures how well the product seals against rain. Windows are listed in class 1A-7A where 7A is best.
A means that the product has been tested in unshielded condition, B shielded. At pressures above 600 Pa, class Exxx is specified, eg E900.