Wignalls Chartered Surveyors provide clear, professional advice on extensions undertaken without planning permission, helping homeowners understand their legal position and what steps may be required.
Extending without planning permission is a subject that often causes confusion, and local builders are not always the best to ask.
Some homeowners assume that all extensions require formal consent, while others rely on informal advice and proceed without confirming their position. The reality sits somewhere in between. Some extensions can be built under permitted development rights, but strict limits and conditions almost always apply.
An extension that falls within permitted development rights does not require a full planning application. However, size, height, proximity to boundaries, previous alterations and property type all influence whether an extension is lawful. Even a small mistake can create problems, especially when it comes to selling or refinancing the property.
Permitted development rights allow certain types of extension to proceed without formal planning permission, provided they meet defined criteria. These rules differ depending on whether the property is detached, semi-detached or terraced. Whether the property is located within a conservation area or subject to other restrictions can also be factors.
The key things you need to take into account are:
It is not uncommon for properties to have lost their permitted development rights due to earlier planning conditions, making professional advice particularly important.
Where an extension has been built without planning permission and falls outside permitted development limits, the local authority may take enforcement action. That could include taking the extension down. Even if this is not enforced, there may be other isues to contend with, including:
In some cases, it may be possible to apply for a Certificate of Lawfulness to confirm that the extension is permitted development. In others, a retrospective planning application may be necessary.
Wignalls Chartered Surveyors can provide you with practical guidance on any extension. Early advice like this can prevent costly mistakes and reduce uncertainty. Well can:
The aim is to provide clear answers and proportionate solutions rather than unnecessary complications.
Planning matters are rarely helped by guesswork. Clear documentation, accurate drawings and a proper understanding of policy are essential. By approaching the issue calmly and professionally, most situations can be resolved practically.
If you are considering an extension without planning permission, or need advice on work already carried out, Wignalls Chartered Surveyors can provide clear and dependable guidance.
Contact our expert team today to discuss your property and arrange professional advice tailored to your circumstances.
© Wignalls Chartered Surveyors 2025
to save your favourite homes and more
Enter your email address and we will send you a link to change your password.