How Big Can an Extension Be Without Planning Permission?

Matt Keane
November 15, 2023

Do you ever consider increasing your living space with an extension but find that the planning permission laws are confusing? Don't worry; many people feel the same way. The rules for building in Ireland can be very complicated.

After extensive research of the home extension rules, we've discovered specific guidelines that dictate just how large your dream addition can be before planning approval becomes necessary.

So, come along as we explain these directives to you, making the road to expanding your property simpler and smoother.

Key Takeaways

  • Homeowners in Ireland can build a rear extension without planning permission if it meets specific guidelines.
  • The maximum height of the extension should not exceed four metres, and the maximum size is 40 square metres.
  • Multiple-storey extensions should not be taller than the existing house.
  • Smaller domestic extensions, like conservatories, may be exempt from planning permission if they comply with regulations.

Guidelines for Extensions Without Planning Permission in Ireland

The guidelines for extensions without planning permission in Ireland include restrictions on the maximum height of the extension (four metres) and the maximum size of the extension (40 square metres).

There are also limitations on building multiple-storey extensions.

Maximum height of extension (four metres)

We can build our home extension up to four metres high. This rule helps keep our houses safe and nice-looking. But we need to watch out! We should not make the extension taller than the existing house if it has more than one floor.

These are Ireland's rules, so let's stick to them when we add to our homes.

Maximum size of extension: 40 square metres

When building an extension without planning permission in Ireland, it's important to know that the maximum size allowed is 40 square metres. This includes any previous extensions built after 1964.

So, the size and scale of the extension play a crucial role in determining whether planning permission is required. So, if you're considering adding extra space to your home, keep in mind that staying within the limit of 40 square metres will help you avoid the need for planning permission.

Restrictions on Building Multiple-Storey Extensions

If you are thinking about building a multiple-storey extension on your property in Ireland, there are some important restrictions to keep in mind. According to the planning regulations, if your extension is more than one storey, it should not be taller than the existing house.

Furthermore, this means that you need to make sure that the height of your new extension does not exceed the height of your current house. It's essential to follow these rules and consider them when planning your project.

Considerations for Rear Extensions

When considering rear extensions, homeowners in Ireland need to be mindful of size limitations and ensure compliance with the guidelines set forth by planning regulations.

Size limitations

Irish homeowners need to be aware of the size limitations when considering building an extension without planning permission. The maximum size of an extension, including any previous extensions built after 1964, should not exceed 40 square metres.

So, this measurement takes into account the overall footprint of the extension. It's important to note that smaller domestic extensions, such as conservatories, may be exempt from planning permission if they comply with regulations and are located at the rear of the house.

However, it's essential to understand and follow all guidelines and requirements before proceeding with any home extension project in Ireland.

Compliance with guidelines

To comply with the guidelines for extensions without planning permission in Ireland, it's important to keep the following factors in mind:

  • The height of the extension should not exceed four metres.
  • If the extension is more than one storey, it should be no taller than the existing house.
  • The size of the extension, including any previous extensions built after 1964, must not exceed 40 square metres.
  • The size and scale of the extension play a crucial role in determining whether planning permission is required.
  • Smaller domestic extensions, like conservatories, may not need planning permission if they are at the rear of the house and meet regulations.
  • It's essential to be aware of any recent changes to permitted development rules that allow for larger extensions without planning permission, up to six metres.

Exceptions to Planning Permission Requirements

Small-scale domestic extensions that meet specific criteria may be exempt from planning permission requirements in Ireland. These exceptions allow homeowners to extend their properties without going through the planning process, as long as they comply with certain terms and conditions set by Irish legislation.

Small-scale domestic extensions

For small-scale domestic extensions in Ireland, you may not need planning permission as long as they meet certain criteria. These smaller extensions, like conservatories, can be built to the rear of your house without going through the planning process.

However, it's important to comply with regulations and guidelines regarding size and location. Remember that any previous extensions built after 1964 will also be included in the total size limit of 40 square metres for your extension.

So, this means that even if you've already extended your home, there are still options available to expand further without planning permission. Just make sure to stay within the permitted limits and follow all requirements.

Compliance with specific criteria

To build an extension without planning permission in Ireland, it is important to comply with specific criteria. Here are some key points to keep in mind:

  • The height of the extension must not exceed four metres.
  • If your extension has more than one storey, it should not be taller than your existing house.
  • The total size of the extension, including any previous extensions built after 1964, must not exceed 40 square metres.
  • It is crucial to consider the size and scale of the extension when determining whether planning permission is required.
  • Smaller, small-scale domestic extensions like conservatories may be exempt from planning permission if they are located at the rear of the house and meet all regulations.
  • Recent changes to permitted development rules allow for larger extensions without planning permission, up to six metres in some cases.

Thinking of Adding an Extension? Build with Confidence!

In conclusion, homeowners in Ireland can construct a rear extension without planning permission as long as they meet certain guidelines. These include a maximum height of four meters and a maximum size of 40 square meters.

So, smaller domestic extensions may be exempt from planning permission if they comply with regulations. It's important to stay informed about the rules and exemptions when considering building an extension in Ireland. Need to plan an extension with BuildTech? Check out our guidelines and start planning today!

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*FYI, parts of this blog post were drafted by artificial technlogy. But rest assured, it's been thoroughly researched, edited, reviewed and me & my team.

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