Are you thinking about bringing more natural light into your home? Roof windows are popular among homeowners because they can transform dark areas into bright and welcoming living spaces. However, they’re often associated with pitched roofs and loft conversions, so you might be wondering if a window can be installed on a flat roof as well. The answer is yes! There are many options available on the market, from flat rooflights to flat lanterns, all designed specifically for flat roofs.
In this guide, we’ll walk you through the installation process and offer helpful tips on choosing the right window for your roof and staying compliant with UK building and planning regulations.
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Understanding the Benefits of Flat Roof Windows
Flat roof windows and skylights are increasingly popular in modern homes due to their ability to bring daylight into areas where vertical windows simply aren’t an option, for example, enclosed parts of the house. Skylights can make large open-plan areas feel brighter and more inviting. In smaller rooms, they free up valuable wall space, offering more flexibility to create a functional furniture layout.
Typically, the main source of lighting in most rooms is mounted on the ceiling to ensure even distribution of light across the space. Overhead skylights work in the same way. Moreover, unlike vertical windows and pitched roof skylights, windows installed in flat roofs don’t depend on the sun’s position and bring in sunlight throughout the entire day. This reduces the need for artificial lighting and, in turn, lowers energy costs.
Skylights for flat roofs come in a wide range of designs and sizes, with bespoke solutions available for more unique projects. High-quality skylights with triple glazing offer superior thermal efficiency and overall performance compared to double-glazed windows. They are often equipped with convenient extra features as well. For example, self-cleaning glass that reduces the build-up of dirt, making maintenance easier. Electric opening mechanisms with remote control are a great choice for skylights installed in hard-to-reach places, and some models even include rain sensors that automatically close the skylights to protect your house from water damage.
Do You Need Planning Permission to Install Flat Roof Windows?
In most cases, there’s no need to obtain planning permission when installing new skylights on a flat roof. This type of roof alteration is considered to be permitted development if:
- it doesn’t exceed the height of the existing roof,
- the window doesn’t protrude more than 150 mm from the existing roof.
However, your right to permitted development may be limited, for example, if your property is in a conservation area or is a listed building. If you’re not sure whether your project requires planning permission, you can find more information on the Planning Portal website or contact your local council or Local Planning Authority.
It’s important to note that even if your project doesn’t require planning permission, it must still comply with the UK Building Regulations in terms of thermal performance of your new skylights, ensuring the structural integrity of the roof and preventing cold bridging.
Working with an experienced builder or installation team is the best way to ensure full compliance with legal requirements.
Flat Roof Skylight Installation: Everything You Need to Know
Installing a skylight, whether on a flat or pitched roof, always requires careful preparation. Before you begin, make sure to:
- Verify that the structure of your roof can be safely altered to create an opening.
- Choose the right window type and size for your needs. Double-check the measurements to ensure a perfect fit.
- Gather the necessary materials and tools.
- Clear the area to avoid any accidents and damage during installation.
Finally, always follow the instruction manual provided by the manufacturer. Incorrect installation can lead to leaks, poor performance, and even void the warranty.
Other products in category: Flat Roof Windows
£495.83 tax excl.
Other products in category: Flat Roof Windows
£845.83 tax excl.
Essential Tools and Materials
- Measuring tape
- Pencil or chalk line
- Saw
- Level
- Utility knife
- Screwdriver/drill
- Hammer
- Ladder
- Protective gloves and goggles
- Insulation materials
- Flashing kit (suitable for your skylight and roof covering material)
If you’re replacing a flat roof skylight
- Remove the old skylight. Start by taking off the flashing and any surrounding tiles, then carefully remove the frame.
- Inspect the opening for damage and repair if needed. Make sure that the edges are even.
- Install the new skylight frame. Secure it using the screws and fixings provided by the manufacturer.
- Add insulation around the frame and fit new flashing.
- Install the sash.
If you’re installing a new flat roof skylight
- Mark the position for your skylight inside the room.
- Cut out the opening. Be careful not to damage the surrounding area when removing the roof material and tiles.
- Make sure the edges of the opening are level and even.
- Fit the window frame into place and secure it using the fixings provided by the manufacturer.
- Add insulation. (Consider using an insulation collar for extra protection.)
- Install the flashing.
- Insert the sash into the frame and secure it properly.
FAQ
How much does it cost to install a window in a flat roof?
The average cost of installing a new skylight, including both the window and labour, starts at around £800. However, the final price can be much higher depending on the size, quality, glazing options (double or triple glazing), glass thickness, style, and any additional features you choose—sometimes reaching several thousand pounds.
What types of flat roof windows are available?
Flat roof windows are available in a variety of styles that cater to various needs. A fixed flat rooflight is perfect if you simply want more daylight, while an opening skylight (manual or electric) provides ventilation as well. Other options include:
- roof lanterns: a great choice for maximum daylight and unique style,
- walk-on roof lights with reinforced glass,
- access windows for quick and easy access to the roof.
Can VELUX windows be installed on flat roofs?
Yes, VELUX offers a range of products designed for flat roofs, including both fixed and opening models. Many can be equipped with smart features such as remote control or weather sensors.
Can I install a flat roof window myself?
It’s possible, but generally not recommended unless you’re an experienced DIYer. Mistakes during the installation process can compromise your roof’s structure, cause leaks and affect your warranty cover. For most homeowners, using professional installation services is the safer choice.
