Does a Basement Conversion Require Planning Permission?

Does a Basement Conversion Require Planning Permission?

Basements are a great option for people living in areas where there isn't much room to expand outward and digging down seems like the only solution. In recent years basement construction has become quite a topic in London leading many boroughs to tighten up their respective regulations. One example is Kensington and Chelsea which was the borough to implement a basement policy. According to this policy, basements cannot exceed 50 percent of the garden area. Must not have wells or railings at the front or side of the property. These measures aim to preserve the appearance and character of the neighborhood.

The rules governing the creation of living spaces in basements are constantly changing and in many are currently, under review in different boroughs across London. If you're considering building a basement it's best to consult with your local authority and planning department before starting any construction work.

Planning Permission for Basements

Typically you don't require planning permission when converting an existing basement or cellar into a living space. Converting a cellar to a living area is considered a "change of use " which means that planning permission is not necessary. However, if you're constructing a basement significantly increasing its size, or making changes that alter the external appearance of the property such, as adding a light well then planning permission is required.

If you need to lower the floor level of your cellar to increase ceiling height this may require planning permission. However minor extensions and alterations can often be carried out under Permitted Development Rights. Additionally, if your property is listed as a building you will likely need consent for any external modifications.

To ensure clarity and confirmation that planning permission isn't necessary, for your project it's advisable to contact your planning office in writing. Having documented proof that no planning permission was required can be valuable when selling your property in the future.

Is a Basement Extension Classed as Permitted Development?

In theory, converting an existing basement into a living space typically doesn't require planning permission. You can find information, about basement conversions on our site. However, it's important to note that like any home extension project falling under permitted development, there are rules that must be followed. For instance, if you plan to add features like a lightwell, railings, or skylight at the front of your property that significantly impact the appearance of your house you will likely need to apply for planning permission.

If the excavation work involved in creating a basement is extensive planning permission will likely be required.

Additionally, any of the conditions listed below would prohibit the development from being classified as permitted development. Would necessitate obtaining planning permission;

The creation of a separate residential unit.

Living in a conservation area. Having listed property status.

Having a property from permitted development rights (e.g., being a flat, than an entire dwelling).

Do I have to obtain building regulations approval if I want to extend my basement?

For any excavation work or expansion of a basement, you will need to obtain approval, from the building control authority locally in your borough or county.

Are there any permissions required for a basement extension?

In some cases, you will need to reach an agreement with your neighbors regarding party walls. This applies when the excavation is within three meters of a neighboring structure when it goes deeper than the neighboring structure foundations or when it is within six meters of the neighboring structure and falls within an area defined by a 45-degree line from that structure. If your property is leasehold you will also need permission from the freeholder as most residential leases require landlord approval, for alterations.

Ready for your Basement Conversion Project?

To determine if you need planning permission, for a basement extension based on your circumstances and property it is advisable to consult with your planning authority. For complex projects, it is generally recommended to seek guidance from an architect who can effectively communicate your intentions and navigate the process.

Basement extensions that involve excavation are typically more complex than extensions unless you are simply converting an existing space. The first step usually involves hiring an architect who can assist in hiring experts such as a structural engineer and party wall surveyor ensuring compliance, with legal requirements. Contact our team for more information.