Standard window sizes are important for making a cost-effective choice when replacing or building a new house. They define a home, add curb appeal, and affect the ambiance of rooms. Choosing the right size can illuminate a room, expand space, and add a friendly glow. Whether starting from scratch or renovating, selecting the correct window size is crucial.
In this guide, Grandsea walks you through the most common window dimensions and shares a few helpful tips to make choosing the perfect windows (and doors!) a whole lot easier.
What are the standard window sizes?
Casement or Hinged Windows These are the classic windows that swing open on hinges—clean, simple, and elegant. While the exact sizes can vary, you’ll commonly find single-pane casement windows around:
- 60–70 cm wide x 120 cm high
- 70 x 140 cm
They’re a perfect choice for spaces where you want to create a statement and let air flow in.
Single-hung and double-hung window sizes: If you’re looking for a more traditional design with the option for better airflow, double-hung windows are a solid choice. They also tend to come in more size options. Some of the standard sizes include:
- 35 to 47 inches wide
- Popular sizes include 110×150cm, 120×130cm or 120×140cm
These work well in almost any room—from bedrooms to living areas.
French Door and French Window Sizes: Want to open up a space and bring in more light? French doors and French-style windows are a beautiful way to do just that. They’re particularly good to use on patios or balconies. Standard sizes tend to look like this:
- Single French Door : 90 cm x 255 cm
- Double French doors: 120cm x 245cm
These add a polished sensibility and a more outdoor feel to your home.
Window Width
In terms of window width, standard windows can be anywhere between 600mm and 1200mm. Again, the width depends on the particular needs of the room and how much natural light is needed. It is essential to consider not only the size of the window, but also the aesthetic consideration: wide windows can create a more pleasing aesthetic effect.
Window Height
Regarding window height, regular windows can be of heights 900mm to 1200mm altogether. Measure leaving a margin for daylight and aeration of the room. Nonetheless, the height can be modified to your liking or building standards and window brands can likewise have windows of varying heights.
Other factors that affect standard window sizes
What size windows should I install? You can find windows with different types of opening and closing in the product catalogs of window brands. The most common options are casement, silding and tilt & turn openings. Casement windows are the traditional variants of windows that open inwards or outwards. On the other hand, tilt-and-turn windows feature an outward opening with hinges on the upper part of the window. This option is particularly suitable for areas with limited outdoor space;
One of the most relevant aspects when planning or renovating a residential property is the choice of window size, since it will depend on it how much natural light will enter the environment; It is also worth remembering that purchasing the best windows aims at ensuring the best thermal and acoustic insulation performance.
In general, it can be said that the window height of modern buildings is preferred as 120-140 cm. It should also be noted that, in some areas, there is a legal obligation in some areas and at least the minimum window height must be observed and the window frame must be at least 1 meter from the ground.
Tips for choosing window size
- Brightness and view: Think about which way your home faces, and how important it is to maximise natural light and panoramic views.
Thermal and acoustic insulation: Modern windows have excellent thermal insulation Choose low-e glass for better climate control;
Style and aesthetics: The size and appearance of the window should match the architectural style of your home;
Black windows with narrow frames are becoming popular Local laws:
Check if there are local regulations requiring a minimum height for windows;
Is it useful to use standard window sizes?
Yes, there are standard window sizes that allow door and window manufacturers and installers to offer convenience, manufacturers can produce windows more efficiently and installers can complete window installations faster. There are also obvious benefits for consumers: no matter what material you opt for; you can compare quotes from different door and window companies in a shorter time and at a lower cost, therefore, get the door and window you want.
You can also contact the door and window manufacturer and request custom sizes for your windows and french doors (for a fee).
Non-standard openings are more common in older houses, building with high ceilings or if residential or private villa, such as attic, the ceiling may be irregular. In this consideration, we strongly recommend that you consult a professional to accurately measure. You can also choose to trust Grandsea Windows and Doors, whose experts will patiently give you measure help advise, but just a click of your finger and contact us.
To benefit from the long term, it is advised to opt for quality profiles. In our catalog you will find high strength aluminium frame windows in a variety of dimensions with some offer excellent performance in the area of thermal and acoustic insulation.
How to measure window size?
Whether you’re replacing your windows or installing new ones altogether, it’s absolutely crucial to get the right measurements. Perfectly fitting windows mean better insulation, a more straightforward installation process, and fewer future problems.
Don’t worry—it’s easier than you think. Here’s a simple step-by-step guide to doing it right.
What You’ll Need You just need a tape measure and pencil (and maybe a notepad) to complete this project. Be sure to clean out the window opening before you take your measurements so you can clearly see all the edges and frame details.
Step 1: Measure the Height Measure your window’s height first. Hold your tape measure vertically along the windowsill to the top of the opening (a.k.a. the lintel). Keep the tape measure straight, making sure it’s right next to the frame, to get the most accurate measurement. Write that number down.
Step 2: Measure the Width Next, measure the width from one end of the window frame to the other. Start from the top left of the frame and draw the tape straight across to the top right of the inside of the frame. Include any frame elements that reside within in the window frame and are visible on the sides. Write down the width whenever you’ve completed this part.
For more precision, take another width measurement—this time running right through the center of the window opening. Frames can naturally sag a little over time, so this second measurement serves as a cross-check to capture any uneven areas.
Step 3: Measure the Window Sashes (If Affected) If you’re going to be removing the actual window sashes (or panels), make sure to measure those as well. Measure the height and width of each individual sash, especially if you have more than one. Don’t just assume that they’re all the same.
Now What?
Once you’ve got your measurements, you’re ready to shop. If your measurements are similar to standard sizes, then congratulations you can purchase off-the-shelf replacements. Otherwise, you can contact a window and door supplier, such as Grandsea and they can help you with a perfectly custom-fit solution for you.
From the outset, getting the size correct will save you time, money, and a lot of hairs keeping you from tearing them all out! Take your time, measure well, and you will be rewarded without fail!
Window Size: What is the minimum size a window must have?
Window sizes vary widely depending on the architectural style of your home and your personal preferences, but there are a few basic guidelines that can help inform your choices. Ultimately your windows should allow plentiful natural light, air flow, and ideally, a pleasant view, while still complementing the interior design of your room. What is the minimum size for a window? Just follow this simple rule of thumb: your window width should be no less than a tenth of the floor space of your room.
This means that for a room space of 20m2, we should have a window of minimum 2m. Only then will the room receive an adequate amount of air and light, and in case of danger the space will be sufficiently served in terms of evacuation and rapid exit from the room.
This is a general rule of thumb that most share with you when asking about your windows height: the windows height should be a minimum of ten percent of the ceiling height. For example, if the roof is a height of three meters, the window height would need to be a minimum of 0.3 meters in height. This will allow you a pleasant view to the outside as well as provide a lot natural light into the room.
Window height should be more from floor level. Height should be such as we can be able to see plenty of pleasant outside view and can be able to get fresh air easily. Normally window height considered from 10% of height from ceiling level. For example if ceiling is 3meter height then window is to be start from 0.3m from ceiling level.
In addition to the minimum size, the shape of the window is also important. Traditional casement windows are a popular choice, but we can also choose, bifold windows, tilt windows or sliding windows. The choice of the shape of the windows depends on our taste and the aesthetics of the building.
Conclusion on standard window sizes
The size of the window depends on several factors and can vary according to your personal preferences. As it is important to consider the architectural style of the house, the natural lighting required, ventilation needs and the impact of the surrounding environment, such as soundproof windows next to the street. Also remember to consider the type of window material, as it will affect the size and amount of natural light entering the home.
