Can I put a window in my loft without converting it?

You can put a window in your loft without converting it. But, your loft window should comply with building regulations and planning permissions.

Adding a loft window can improve your home’s ventilation and comfort. Plus, loft windows can create bright, airy storage rooms or non-habitable lofts.

Get started with our quick guide to planning permission for loft windows.

Do I need planning permission for a roof window?

Under permitted development, you can make certain home improvements without planning permission.

This means you can add loft windows to existing flat or pitched roofs.

But, it depends on the window type, your home and local building regulations. So, you might need building regulations approval to put a window in your loft without converting it.

Unsure if you need planning permission, or need anything more than minor changes?

Chat with a trusted loft window installer for advice.

What are the rules for loft windows?

As a rule, you won’t need planning permission for loft windows if they:

• Don’t stick out more than 150 millimetres (about 6 inches) from the existing roof slope
• Don’t exceed the height of the existing roof
• Don’t protrude over the roof ridge
• Are obscure-glazed if side-facing windows
• Are 1.7 metres above the floor if opening
• Must not be opening windows if less than 1.7 metres above the floor

Exceptions to permitted development

As mentioned above, you can only install loft windows without planning permission if they fall under permitted development.

However, some loft window installations sit outside permitted development.

Some of the most common exceptions include:

Listed buildings

Some homes are a part of history. So, planning permission for listed buildings is in place to improve their value and character.

Your local authority is unlikely to approve drastic changes. But it doesn’t mean all is lost.

You can still request planning permission for changes that complement the character of the building.

Conservation areas

Homes in these areas will have more significant restrictions for roof windows and skylights.

You will also need to check the rules if you live in an Area of Outstanding Natural Beauty or a National Park. These homes are usually subject to building regulations.

Side-Facing Windows

Adding side-facing windows to your loft might involve planning permission because it affects your neighbour’s privacy.

If it’s unclear if you need planning permission, get advice from a window installer.

They can help you check whether you need planning permission and choose the best window for your roof.

Can I put a window in my loft?

You can often add a loft window to your loft conversion without planning permission, including for flat or pitched roofs.

However, this change can depend on several factors. For example, the window type might increase the need for planning permission.

Some popular choices of loft windows without a conversion include:

Dormer windows

As vertical windows that jut out from a sloping roof, dormer windows add headroom.

These roof windows add functional space and light to a small loft conversion or attic space.

Types of dormer windows to consider are:

• Gable dormers allow for more water drainage than other roof windows
• Hip roof dormers are popular when you want to keep the existing design of your home
• Eyebrow dormers can add charm and increase a home’s value

Velux roof windows

Velux windows are a popular addition to existing sloping roofs. They add fresh air and daylight to a converted or non-converted loft.

Under permitted development guidelines, you can add a Velux window to a non-converted loft without planning permission.

But, make sure your new Velux window complies with building regulations.

For example, make sure your new Velux window is:

• Professionally fitted
• Properly insulated
• Structurally sound
• Functions as a fire escape

Find out how to add more light to your loft with windows.

Building regulations for loft windows

Installing a loft window involves altering the roof structure to create the opening, so you’ll usually need building regulations approval.

Check your loft window installation covers the below essential building regulations:

• Structure – installing a new loft window involves cutting rafters or joists away and needs extra support
• Weatherproofing – ensure adequate insulations and weatherproofing for the edges of the roof light and glass
• Ventilation – consider ventilation for the existing roof void to ensure airflow
• Energy efficiency – install adequate glazing to reduce heat loss and ensure energy efficiency

Get more info on building regulations approval and planning permissions.

Do loft windows need to be a fire escape?

Carefully consider whether you need your loft windows to be a fire escape at the start.

For example, non-habitable loft conversions might not need a fire escape.

For habitable loft conversions, your loft window must function as a fire escape route in the event of a fire. There must be a window big enough and low enough to serve as an emergency exit.

Always check your local authority’s building regulations and fire escape requirements.

Find a qualified loft window installer near you

There’s a lot to consider when planning your loft window installation.

You’ll only find trades who meet our high standards and pass our checks on Checkatrade. We’re so confident in the quality of the trades on Checkatrade that if you book through us, we guarantee their work up to £1,000. Guaranteed for 12 months – Eligibility and T&Cs apply.

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