Loft Conversion Window Options

When it comes to converting your loft, windows are a key consideration. A light, well-ventilated attic room could be your favourite room in the house! Let’s look at some loft conversion window options so you can get the design that’s perfect for you.

Explore loft conversion window options by priority – such as to maximise light or get the best view outside – or view options by window styles.

Roof windows

Roof windows are designed to be fitted into the roof of a building, either sloped or flat. They’re different to dormer windows, which are vertical windows that project out of a sloped roof.

Sometimes, roof windows might be referred to as skylights. At Dakea, our range of skylights are designed for unoccupied spaces – for example, a garage. They don’t have the same insulative qualities as our roof windows.

Loft conversion window options by priority

If you’re converting your loft, you probably already have an intended use for it. Depending on what this is, you might have different priorities for what you want to achieve. Let’s look at some top window options for achieving your ideal room.

Maximise light


Maximising light is a common priority for loft conversions. The best way to do this is to use multiple smaller windows, rather than one larger window.


For example, one large roof window might allow daylight into 46% of the room. Two roof windows with the same combined surface area as the large one, would light 48% of the room. Even better, four roof windows with the same combined surface area as the original large window, but distributed more evenly, could light up 65% of the room.


Maximising light in your loft conversion is best done with multiple windows distributed around the space.

A bright hallway with a row of roof windows along one wall

Prevent overheating

It’s common knowledge that loft rooms get hot in the summer. Heat rises up through the house and can easily accumulate in the loft space.

There are a few key ways to reduce this.


You could use fewer windows - which would let less light in - but this is often not preferred! After all, one of the benefits of a loft room is that it’s nice and bright. It’s better to opt for an anti-heat roof window blind. It sits on the external side of the roof window to reflect the heat from sunlight during the summer months.


An internal blind is also very useful in controlling the light level - and therefore the heat level - on very hot days.


Ventilation is also key to controlling heat levels in an attic room. Opt for roof windows with built in passive ventilation systems, like Dakea’s range, and that can open.

A grey, anti-heat blind on the external side of a roof window

Include a bathroom

If you want to include a bathroom in your loft conversion, you need to choose windows that:

  • Can be opened to allow moisture to leave, preventing condensation and mould growth.
  • Well insulated windows, again to reduce the risk of condensation.
  • PVC material, rather than wood, so moisture doesn’t damage the frame
  • Consider opaque windows too for added privacy without reducing light

One of our best options for bathroom loft conversion windows is the opaque PVC roof window. It’s ideal for environments with lots of moisture, like bathrooms.

Get the best view

If you have a stunning view from your house, you’ll likely want to make the most of it!

Our Vision or Vertica energy windows are a great choice. Pair them with an openable roof window on top to greatly increase your field of view.

A living room with three tall roof windows showing a view of the city



The roof can be an entry point for intruders. If you’re concerned about security in particular, you should select a roof window built specifically to reduce security risk.

Our Secure White roof window is a reinforced, toughened and extra welded window. It has reinforced hinges, two discrete locks and a glued pane-to-sash system to prevent dismantling. It’s been rigorously tested too.

Keeping warm

While lofts can get hot in the summer, they’re also well known as a key place heat escapes in the home.

If a roof is not well insulated, heat will rise through the house and escape through the roof. As you’re converting your loft, be sure to keep this in mind and ensure it’s well insulated.

Roof windows play a key part in insulation. You can choose whether to have double or triple glazing windows to improve insulation, as well as whether these use krypton or argon gas. There are additional options, such as the window construction itself and how this is designed to insulate the home.

Our best roof window for insulation also includes layers of heat-reflecting and sun-protective coatings to keep the home warm in winter and cool in summer.

The more insulation you want, the more expensive the window is likely to be. However, it’ll save you money in the long term on heating bills!

Loft conversion window styles

The style of loft conversion window you choose will impact the overall finish and appearance of your room.

Overhead, flat windows

Flat roof windows are designed to be installed in flat roofs. They’re ideal if you have a section of your loft conversion with a flat roof, rather than sloped.

They’re great in rooms that don’t meet the side of the building, so have no sloped walls in which to fix a ‘traditional’ roof window. They help to add light and make the room brighter.

Aside from loft conversion, they’re also a popular choice in other types of extensions where the ground floor of a house is extended beyond the above floors.

You can get both fixed and open-able flat roof windows. It can be a good idea to use an electric opener – as is standard with our openable flat roof window – because they’re often much harder to reach! Make sure you use an electric roof window blind too.

A hallway with three overhead roof windows half covered by blinds

Pitched roof windows

Pitched roof windows are the most common kind of roof window. These are any roof windows installed at an angle – rather than flat or vertically. They make up most of our roof window range at Dakea.

Most loft conversions will have a sloped roof that affects at least part of the wall, which is why pitched roof windows are the most common style.

They’re available in different frame materials, such as wood or PVC, as well as different insulative qualities. If you’re not sure which is right for you, use our configurator tool.

A bedroom with a pair of roof windows on the wall behind the bed


You can get both openable and fixed roof windows (ones that can’t be opened). If you want a fixed window, it should always be paired with an openable one too. This is vital for ventilation control in the room, as well as fire safety.

Dormer windows

Dormer windows are vertical, installed in a dormer. This is a small structure that protrudes from the roof itself. It tends to be a more costly choice, but can add additional space if the loft conversion is very small.

Do I need planning permission to install roof windows in a loft conversion?

If you’re just installing roof windows, and not making any structural changes, you probably don’t need planning permission. It will most likely be covered by permitted development. However, it’s worth double checking with your local authority.

If you’re doing a full loft conversion that requires structural changes, you are likely to need planning permission. Talk with your contractor and/or local authority to establish what is required.

Read our full guide on how to convert a loft for more information.

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