Planning Permission vs Permitted Development: What’s the Difference?

One of the most common questions we receive from homeowners and property investors is whether planning permission is required for their project, or if it can be done under permitted development.

Understanding the difference early can save time, reduce stress, and help your project move forward smoothly. In this guide, we explain planning permission versus permitted development and how to determine which applies to your project.

1. What Is Permitted Development?

Permitted development (PD) allows certain types of building work to be carried out without applying for full planning permission, as long as specific rules are met.

Common examples include:

• Rear extensions within size limits

• Loft conversions

• Internal alterations

• Some outbuildings

Although planning permission isn’t required, projects must still comply with building regulations.

2. What Is Planning Permission?

Planning permission is formal approval from the local council for developments that fall outside permitted development rules.

Planning is usually required when:

• Extensions exceed size or height limits

• The property is in a conservation area

• The building is a flat or commercial property

• The design significantly alters the building’s appearance

Each council has its own policies, which is why professional advice is important.

3. Key Differences Between Planning and Permitted Development

Permitted Development	Planning Permission
No formal planning application	Formal council application
Quicker process	Longer decision times
Strict size and design limits	Greater design flexibility
Still requires building regulations	Still requires building regulations

4. Lawful Development Certificates

Even when a project falls under permitted development, we often recommend applying for a Lawful Development Certificate.

This provides written confirmation from the council that the work is lawful and can be extremely valuable when selling or refinancing a property.

5. How We Help at Studio RUUM

We assess each project individually and advise whether:

• Permitted development applies

• Planning permission is required

• A lawful development certificate is recommended

Our role is to guide you through the most suitable route while ensuring the design is compliant, practical, and buildable.

Not sure whether your project needs planning permission or qualifies under permitted development?

Book a consultation and we’ll review your proposal and advise on the best next step for your property.

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