Do I need Planning Permission for my project?

Most homeowners aren’t sure whether they need Planning Permission for their extension, loft conversion or renovation. Many have heard of permitted development rights but don’t fully understand how they work or whether their project qualifies. This page explains the rules in simple terms, helping you understand when you must apply to the council, when your project may be allowed under permitted development, what the differences are and how to avoid common mistakes. Our aim is to give you clear, practical guidance so you can move forward with confidence and avoid delays, refusals or unnecessary costs.

In the UK, almost every alteration you make to your home is controlled by planning law. Any change that affects the outside of your property, whether it is an extension, a loft conversion or a new outbuilding, may require permission from the local council. At the same time, it would be neither practical nor proportionate for councils to require planning applications for every minor alteration. Permitted development rights were introduced to define the types of work that can be undertaken without seeking formal approval.

These rights allow many common home improvements to proceed without a formal application, but they come with strict limits on size, height, location and appearance. If your proposal stays within those limits, you may not need to apply for Planning Permission. If it exceeds them, or if your property is subject to restrictions, then you will need formal approval from the council before starting any work.

It is important to understand these rules because carrying out work without the correct permission can lead to serious consequences. The council can issue an enforcement notice requiring you to reverse the work, even if it has already been completed. Unauthorised alterations can also cause problems when selling your home, as buyers and solicitors will expect evidence that the work was lawful. In some cases, it may affect your home insurance or create difficulties with lenders.

This page explains how the rules operate, when permission is required, when permitted development may apply and how to avoid the common issues that often catch homeowners by surprise.

When Planning Permission is required 

Planning Permission is generally required for any project where the appearance, size or height of the existing building will be altered. Even if the work you want to carry out is normally covered by permitted development rights, you will still need to apply for permission if your proposal falls outside the permitted development limits or if your property is subject to restrictions. These situations are not tied to a particular type of project. They relate instead to the scale of the proposal, the location of the property and the planning controls that apply to it.

You will need Planning Permission if any of the following apply:

• The work will change the external appearance or scale of your home.

• The proposal goes beyond the limits set out in permitted development.

• Your property does not benefit from permitted development rights, for example if it is a flat or a maisonette.

• Your home is in a conservation area, a national park, an area of outstanding natural beauty or another protected location where additional controls apply.

• Your property is in an area affected by an Article 4 Direction that removes permitted development rights.

• The project involves creating a new dwelling or changing the use of the building.

• Previous alterations have already used up the permitted development allowance for the property.

• The work is located in a sensitive part of the site, such as the front of the property, where most structures require formal approval.

What can you do under Permitted Development Rights

Permitted development rights allow homeowners to carry out certain types of work without submitting a full planning application, provided the proposal stays within the limits set by national planning rules. These rights are designed to make it easier to improve or adapt your home without unnecessary delays, as long as the work does not have a significant impact on the appearance of the property or the surrounding area.

Under permitted development, you can usually make changes that do not increase the overall scale of the building in a substantial way, do not raise the height of the property beyond the allowed limits and do not affect protected parts of the site such as the front elevation. Internal alterations are also generally permitted, as long as they do not involve creating a separate dwelling or changing the use of the building.

At BerGon Architects, many of the projects we design across Essex and Hertfordshire fall within permitted development rights, provided the proposal stays within the rules and limits. Typical examples include: 

• Porches to the front of the property.

• Small loft conversions where the roof line is maintained or where a dormer is added to the rear.

•Some small single storey extensions that remain proportionate to the original building and stay within the permitted development size and height limits

• External wall insulation, provided the finish is of similar appearance to the existing property.

• Internal works that reconfigure rooms or create new living spaces within the existing structure.

• Some small outbuildings within the garden or curtilage of the property.

• Some garage conversions, depending on the intended use and the particular characteristics of the building.

•Solar panels installation.

Permitted development can apply to a wide range of home improvements, but every proposal must meet all the relevant criteria. The rules consider factors such as size, height, position, proximity to boundaries and the planning restrictions that apply to your property. If the work stays within these limits and your home benefits from permitted development rights, you may be able to proceed without applying for Planning Permission.

It is important to confirm that your property has these rights, as some homes are subject to restrictions that remove them entirely. In those cases, even small changes may require formal approval from the council.

Do you need Drawings, or an Architect, if your project falls under Permitted Development Rights?

Many homeowners assume that if their project falls under Permitted Development Rights, they can simply start building without drawings or professional advice. In reality, this is one of the most common misunderstandings we see across Essex and Hertfordshire. Even when your proposal appears to comply with permitted development, the council may interpret the rules differently, your property may be subject to hidden restrictions, or the work may unintentionally fall outside the limits.

Permitted development is still planning law, and getting it wrong can have serious consequences. If the council decides your interpretation was incorrect, they can issue an enforcement notice requiring the work to be reversed. This can happen even after the project is completed, and it can create problems when selling your home, renewing insurance or dealing with lenders.

For this reason, it is always advisable to obtain formal reassurance through a Lawful Development Certificate. This certificate confirms that the council agrees your project is permitted development and protects you from future disputes. To apply for a Lawful Development Certificate, you must submit the same level of drawings and information required as for a full planning application. In practical terms, this means the design and documentation process is almost identical, even if the council fee is lower.

At BerGon Architects we recommend that clients plan or budget for a full planning application unless the project is very small and clearly within the permitted development limits. This approach avoids surprises, ensures compliance and gives you the confidence that your project is lawful before any work begins.

If you are unsure whether your proposal qualifies, or whether a Lawful Development Certificate is advisable, we can assess your project and guide you through the safest and most cost‑effective route.

Do you still need Building Regulations under Permitted Development?

Yes. Permitted Development Rights only removes the need for a planning application. It does not remove the requirement to comply with Building Regulations, which apply to most building works. Whether you are converting a garage, adding insulation, altering internal walls or building a small extension, Building Regulations approval is almost always required.

At Bergon Architects we prepare the technical drawings and specifications needed for Building Control approval, ensuring your project is safe, compliant and ready for construction.