16/09/2026
Planning Permission Rules for West London Extensions and Lofts
Thinking about extending your home in West London?
From rear extensions to loft conversions, adding space can transform your home. But before work begins, it’s important to understand whether you need planning permission or whether your project can be completed under Permitted Development (PD) rights.
Planning Permission vs Permitted Development
Permitted Development allows homeowners to carry out certain improvements without a full planning application. However, there are limits on size, height, location and design.
In West London, additional restrictions can apply if your property is:
* In a Conservation Area
* A Listed Building
* A flat or maisonette
Covered by an Article 4 Direction
House Extensions
Some single-storey rear extensions may qualify for PD, subject to strict requirements on dimensions, height, materials and garden coverage.
Planning permission may be required for **larger or two-storey extensions, projects close to boundaries, or significant changes to the front or appearance of your property.
Loft Conversions
Many loft conversions can also fall under PD, with limits on the additional roof volume and restrictions on dormers, windows and roof alterations.
Planning permission is generally needed where the proposed design exceeds PD limits, involves certain roof alterations, or where PD rights do not apply, such as many flats and maisonettes.
Before You Start
Planning rules can vary between West London boroughs, so it’s always worth checking your property before committing to a build.
At JNJ Building Services, we can help you understand your options, assess your project and guide you through the design and planning process.
Planning an extension or loft conversion in West London? Get in touch with JNJ Building Services to discuss your project.
