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Loft Conversion Permitted Development


A loft conversion is a fantastic way to add space and value to your UK home. When considering such a project, it’s essential to understand the concept of permitted development, which can simplify the planning process and save time and money. In this blog post, brought to you by Sky Space Loft Conversions, we’ll delve into loft conversion permitted development in the UK and how it may apply to your project.

What Is Permitted Development?

Permitted development rights are a set of planning rules and regulations that allow certain types of development and construction work to proceed without the need for full planning permission. These rights are granted by the government to streamline the process for homeowners and encourage responsible development.

Loft Conversion Permitted Development Rules

In the UK, loft conversions can often fall under permitted development rights, provided they meet specific criteria:

  1. Volume Allowance: The most common criteria for a loft conversion to be considered permitted development are that the additional space created should not exceed 40 cubic meters for terraced houses or 50 cubic meters for semi-detached or detached houses. This includes any previous loft conversions.

  2. Roof Alterations: The roof alterations made during the conversion should not extend beyond the existing plane of the roof at the front of the house, or the highest part of the roof at the rear of the house.

  3. Materials and Appearance: The materials used for the conversion should be similar in appearance to the existing house, ensuring that the external appearance is not dramatically altered.

  4. Windows: Any windows installed as part of the conversion should be at least 1.7 meters above the floor, and the opening area should not exceed 20% of the roof space. Obscure glazing should be used where the window is located within 1.7 meters of a boundary.

  5. Balconies and Verandas: The addition of balconies, verandas, or raised platforms is not allowed under permitted development rights.

  6. Designation Restrictions: Some areas, such as conservation areas, national parks, or Areas of Outstanding Natural Beauty, may have additional restrictions or requirements.

Planning Permission vs. Permitted Development

While permitted development rights can simplify the process, it’s crucial to understand when planning permission is still required:

  1. Exceeding Volume Limits: If your loft conversion exceeds the specified volume limits (40 cubic meters for terraced houses or 50 cubic meters for semi-detached/detached houses), you will need full planning permission.

  2. Designation Restrictions: Properties in designated areas, including conservation areas, may require planning permission even for loft conversions that fall within permitted development limits.

  3. Alterations to the Roofline: If your loft conversion involves significant alterations to the roofline, such as raising it substantially, you will likely need planning permission.

  4. Listed Buildings: If your property is a listed building, you will typically require planning permission for any changes or alterations.

  5. Previous Conversions: If a previous loft conversion has already been undertaken in your property, this can impact whether you can utilize permitted development rights.

Consulting with Professionals

Before proceeding with a loft conversion under permitted development, it’s advisable to consult with loft conversion professionals and your local planning authority. They can provide guidance specific to your property and ensure that your project complies with all relevant regulations.


Understanding loft conversion permitted development rights in the UK can simplify the planning process and allow you to create additional space in your home more efficiently. However, it’s essential to be aware of the criteria and any local restrictions that may apply to your property. Sky Space Loft Conversions has the expertise to navigate these regulations and help you achieve your loft conversion goals. Contact us today to discuss your project and discover how we can make your loft conversion dreams a reality. Elevate your living space with Sky Space Loft Conversions.

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