Brighten up your day

More natural light and fresh air

Bottom-operated roof windows

The sky is the limit with a bottom-operated roof window. Operated with an elegant handle at the bottom, VELUX bottom-operated roof windows give you a full, open view of your skyline and maximise the amount of natural daylight that can be allowed in. We recommend bottom-operated roof windows if you have to, or wish to, place your window in a high position, for instance in connection with a high knee wall.

Watch the operation

Benefits of bottom-operated roof windows

Enjoy panoramic views - While increasing your energy efficiency and natural ventilation

True skylight lighting - greatly increase the amount of natural light in your rooms

Convenient bottom operation - allows for installation on high knee walls

Excellent energy efficiency

Experience a more comfortable home and lower energy bills with VELUX ThermoTechnology™. Innovative use of high performance materials in the window construction provides excellent energy efficiency, insulation and an airtight seal. Look for the ThermoTechnology™ seal for your guarantee of excellent energy efficiency.

Natural ventilation – with a closed window

Let fresh air into your home even when you are away or sleeping, without having to worry about security or bad weather. Pull the unique top control bar once and you will allow fresh, filtered air to enter through the ventilation flap.

Enjoy fresh, clean, filtered air

The built-in air filter improves the indoor climate by preventing dust and insects from entering your home. The filter is reusable and easy to clean.

Are you ready to buy?

Configure your window

Find the price of a VELUX roof window by choosing the following perimeters:

  • the operation mode
  • the inner/outer surface
  • the pane type
  • the size

Calculate the window price

Much more than just a window

Bottom-operated roof windows can dramatically change a room. They’re the fastest way to add natural light, ventilation and the feeling of openness to your under roof spaces. The impact in terms of daylight and fresh air, not to mention the view, is stunning.

Combine roof windows

Combine multiple VELUX roof windows to open up your home to more daylight. Choose between top or bottom operated roof windows in either electrically or manually operated versions.

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You might also be interested in...

Top-operated roof windows

A top-operated roof window is easy to operate - even with furniture beneath. The innovative top control bar allows you to install the window lower than an equivalent bottom-operated window to get an excellent view while standing and when seated.

   
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Add on elements

The vertical window elements are designed to be installed directly below your VELUX roof windows. As the windows stretch nearly to the floor, they ensure a great view and open up your loft – and your living space.

   
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Flashings

VELUX flashings are precision-made and provide a weathertight seal between your roof window and the roofing material. The wide range of VELUX flashings makes it easy for you to choose the right flashing for your roof window, any combination of roof windows and your roofing material.

   

8 good reasons to choose VELUX
The small details that make the difference

  • 1. Less rain noise

    1. Less rain noise

    What you get
    • Extra thick glass
    • Integrated noise-damping foil on covering


    What it means
    • Significant reduction of rain noise (up to 50%)
    • Better sleep throughout the night
    • Peace and quiet during the day

     

    Ask for rain-noise reduction

  • 2. Clearer view

    2. Clearer view

    What you get
    • Super low-energy triple glazing
    • Anti-dew and easy-to-clean coating on outer glass pane


    What it means
    • Superb pane insulation
    • Less dew accumulation
    • Less need for cleaning pane

     

    Ask for anti-dew glazing

  • 3. Personal safety

    3. Personal safety

    What you get
    • Laminated inner glass designed to hold together fragments in case of breakage


    What it means
    • Inner glass will not fall inwards if broken
    • It’s safe to work, play and sleep under the window

     

    Ask for laminated glazing

  • 4. Thermal comfort

    4. Thermal comfort

    What you get
    • Advanced insulation system with expanded polystyrene
    • Exceptionally high insulation properties


    What it means
    • A powerful shield against wind and cold air
    • Less need for heating in the winter

     

    Standard on all windows

  • 5. Gust-safe ventilation

    5. Gust-safe ventilation

    What you get
    • Barrel bolt function to lock the slightly open window securely in place


    What it means
    • Allows safe inflow of fresh air – even on a windy day
    • Window stays in fixed position

     

    Standard on all windows

  • 6. Secure ventilation

    6. Secure ventilation

    What you get
    • Unique ventilation flap
    • Removable, and washable insect filter

        


    What it means
    • Ventilation possible, even when the window is closed
    • Filtered fresh air day and night with no dust and insects

     

    Standard on all windows

  • 7. Perfect blind fit

    7. Perfect blind fit

    What you get
    • Unique pre-fitted mounting bracket for installation of VELUX interior sunscreening

        


    What it means
    • Fast and easy installation of any interior VELUX blind
    • Blinds click in place instantly and precisely

     

    Standard on all windows

  • 8. Safe and easy cleaning

    8. Safe and easy cleaning

    What you get
    • Barrel bolt function lets you rotate the window 180° and lock it into place


    What it means
    • Safe and easy cleaning of the outer glass from inside
    • Both hands free for cleaning, as window is locked in fixed position

     

    Standard on all windows