Do You Need Planning Permission for a Loft Conversion?

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Converting the loft of your house is a popular way to add valuable living space and increase the value of your property. However, before embarking on a loft conversion project, it's important to determine whether you need planning permission or if you can proceed under permitted development rights. In this comprehensive guide, we will explore the factors that determine whether planning permission is required for a loft conversion, the criteria for permitted development, and the steps you can take to ensure a smooth and successful conversion.

Understanding Permitted Development Rights

Permitted development rights allow homeowners to make certain types of alterations or additions to their property without the need to obtain planning permission. These rights are subject to specific limits and conditions outlined in the Town and Country Planning (General Permitted Development) (England) Order 2015.

It's worth noting that permitted development rights may vary depending on the location of your property and its classification. For instance, flats and maisonettes have different planning requirements compared to houses. Additionally, properties in conservation areas or designated lands may have restrictions on permitted development rights.

Permitted Development Criteria for Loft Conversions

To determine whether your loft conversion falls within permitted development, you must consider the following criteria:

1. Building Type: Permitted development rights for loft conversions apply to houses and not buildings containing one or more flats.
2. Previous Alterations: The property must not have had additional storeys added under permitted development rights in the past.
3. Change of Use: If the property was previously used for non-residential purposes and was converted to residential use under permitted development rights, further alterations may require planning permission.
4. Designated Land: Permitted development rights may be restricted in areas such as conservation areas, Areas of Outstanding Natural Beauty, National Parks, World Heritage Sites, and the Broads. Consult with your local council to determine if your property is within a designated area.
5. Size Restrictions: The total volume of the loft conversion, including any previous additions, must not exceed 40 cubic meters for terraced houses or 50 cubic meters for other houses.
6. Roof Height and Design: The loft conversion must not exceed the height of the existing roof and should not include any extension higher than the highest part of the roof. The materials used should match the appearance of the existing house, and any side-facing windows must be obscure-glazed.
7. Setback and Roof Overhang: The loft conversion should be set back at least 20cm from the eaves, and the roof enlargement should not overhang the outer face of the original house's wall.
8. Principal Elevation: If the loft conversion is on the principal elevation of the house facing a highway, it must not extend beyond the existing roof slope.

It's important to note that these criteria serve as a guide for determining whether planning permission is required. If your loft conversion does not meet all the restrictions, you may still be able to obtain planning permission through the regular application process.

Types of Loft Conversions and Planning Permission

The type of loft conversion you plan to undertake can affect whether planning permission is required. Let's explore different types of loft conversions and their potential planning implications:

1. Mansard Loft Conversion

A mansard loft conversion involves raising the side walls of the house and altering the angle of the roof to create additional space. This type of conversion typically requires a planning application, as it significantly changes the external appearance of the property.

2. Hip-to-Gable Loft Conversion

A hip-to-gable loft conversion straightens the inwardly slanted end roof to create a vertical wall, allowing for more usable space. If the conversion does not extend the roof further forward from any existing principal elevation roof facing the highway, it may comply with permitted development rights.

3. Dormer Loft Conversion

Dormer loft conversions involve building an extension on the roof to create additional headroom and floor space. If the dormer does not protrude beyond the plane of the existing roof slope and meets other permitted development criteria, planning permission may not be required.

4. Rooflight Loft Conversion

A rooflight loft conversion, also known as a Velux loft conversion, involves the installation of rooflight windows to bring natural light into the attic space. As long as the rooflights do not protrude more than 150mm from the existing roof slope, they can usually be done under permitted development rights.

5. Balcony Addition

Adding a balcony to a loft conversion can enhance outdoor living space. However, balconies are generally not permitted development and require a planning application. The exception is a 'Juliet' balcony, which does not have a platform or external access and may be considered permitted development.

It's essential to consult with a planning consultant or architect to determine the specific planning requirements for your chosen type of loft conversion.

Applying for Planning Permission

If your loft conversion does not meet the criteria for permitted development or if you prefer the certainty of planning permission, you will need to submit a planning application to your local council. The application process typically includes the following steps:

1. Consultation: Seek professional advice from a planning consultant or architect who can guide you through the planning process and assist with the application.
2. Application Preparation: Prepare the necessary documentation, including elevation drawings, site plans, and any other relevant information required by your local council.
3. Submission: Submit the planning application along with the required fee, which is currently £238. Be sure to include any additional information or supporting documents requested by your local council.
4. Assessment: The local council will review your application, considering factors such as the impact on the surrounding area, compliance with local planning policies, and any objections raised by neighbors or other parties.
5. Decision: The council will notify you of their decision within a specified timeframe. If planning permission is granted, it will usually come with certain conditions that must be met during the construction process.

It's important to note that the planning application process can vary depending on the complexity of the project and the specific requirements of your local council. Seeking professional advice can help streamline the application process and increase the chances of a successful outcome.

Cost Considerations

The cost of a loft conversion can vary depending on factors such as the size and complexity of the project, the chosen design, and the location of your property. Here are some cost considerations to keep in mind:

1. Planning Consultant: If you require professional assistance with the planning application, the fees for a planning consultant can range from £500 upwards.
2. Structural Survey: Depending on the condition of your property and the structural requirements of the loft conversion, you may need a structural survey, which can cost around £1,500.
3. Design and Drawing Production: The cost of design work and drawing production can vary depending on the complexity of the project. Budget around £2,000 or more for this aspect of the conversion.
4. Planning Application Fee: If you decide to apply for planning permission, the current submission fee is £238. However, it's important to check with your local council as fees may vary.
5. Lawful Development Certificate: If your loft conversion falls within permitted development rights, you may choose to apply for a Lawful Development Certificate instead of planning permission. This application fee is currently £128.

Keep in mind that these costs are estimates and can vary depending on your location and specific project requirements. It's advisable to obtain multiple quotes and consult with professionals to get an accurate cost breakdown for your loft conversion.

Conclusion

When considering a loft conversion, determining whether planning permission is required is crucial. While many loft conversions can be carried out under permitted development rights, it's essential to understand the specific criteria and limitations that apply to your property. Consulting with a planning consultant or architect can provide valuable guidance and ensure compliance with planning regulations. By following the guidelines outlined in this article, you can embark on your loft conversion project with confidence, knowing that you have considered all the necessary planning requirements.