Planning Permission in London: A Complete 2025 Guide (Simple & Clear)

A simple guide to planning permission in London. Learn when you need planning permission, how the process works, required drawings, costs, and how Creative Engineers Ltd can help.

Planning permission can feel complicated, especially for homeowners starting their first building project — but the process is easier when you know exactly what is required.This guide explains everything you need to know about planning permission in London, including when you need it, how to apply, timelines, costs, and how we support you through the entire process.

⭐ What Is Planning Permission?

Planning permission is approval from your local council that allows you to build, extend, or alter a property.It ensures that your project follows rules on design, appearance, safety, and impact on neighbours.

⭐ When Do You Need Planning Permission?

You usually need planning permission for:

• House extensions

• Loft conversions with dormers

• New builds

• Converting a house into flats

• Large rear extensions

• Two-storey extensions

• Outbuildings over certain sizes

• Changing the use of a property

Some smaller projects fall under Permitted Development, which do not require full planning permission — but they still need drawings and must follow rules.

If you are unsure, we can check it for you quickly.

⭐ What Documents Do You Need for a Planning Application?

A typical planning application includes:

• Existing & proposed floor plans

• Existing & proposed elevations

• Roof plans

• Site location plan

• Design & Access Statement (if required)

• Structural considerations (if applicable)

We prepare all drawings needed for your submission.

⭐ How Long Does Planning Permission Take?

Most councils in London take:

8 weeks for householder applications

13 weeks for larger projects

Delays can happen if documents are missing — which is why preparing everything correctly from the start is important.

⭐ How Much Does Planning Permission Cost?

Typical council fees:

• Householder application: ~£258

• Full planning application: varies based on project

• Lawful development certificate: ~£129

Our team provides drawings and full support throughout the process.

⭐ How Creative Engineers Ltd Helps

We manage the entire process for you:

• Architectural drawings

• Planning permission submission

• Liaising with the council

• Structural calculations (if needed)

• Building regulations package

• Support until approval

With our integrated architectural and structural engineering services, we make the planning stage simple and stress-free.

⭐ Contact Us

Ready to start your project? Tell us about your plans and we’ll get back to you shortly.