Key Changes to Class Q Permitted Development Rights (2025 Update)

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Class Q Permitted Developement 2025

Barn Conversion Class Q Rules - Introduction

Class Q permitted development rights, which were introduced in 2014, provided a pathway for converting agricultural buildings into residential spaces without the need for full planning permission. This provision was part of the government’s broader strategy to address housing shortages and encourage the reuse of existing structures. The latest revisions to Class Q aim to simplify and expand these opportunities, making it easier for self-builders to embark on their projects.

In this article, we look into the specifics of the recent changes to Class Q, exploring how these updates can be used to create sustainable and eco-friendly residential spaces.

Increased Number of Dwellings:
The number of dwellings that can be created under Class Q has increased from five to ten per agricultural unit, provided the total floor space does not exceed 1,000 square metres.

1. Reduced Maximum Floor Area per Dwelling:
   Each dwelling is now limited to 150m² (reduced from 465m²), encouraging the development of multiple smaller homes rather than a single large residence.

2. Broader Eligibility of Buildings:
   Buildings no longer in active agricultural use as of 24 July 2023 may still qualify—opening up eligibility to a wider pool of structures, so long as they haven’t been repurposed in the interim.

3. Permissible Rear Extensions:
   You can now add single-storey rear extensions of up to 4m on existing hardstanding—an important addition to the Class Q framework, giving much-needed flexibility to layout and light.

4. Mandatory Existing Access:
   The site must have existing suitable access to a public highway, ensuring practicality and safety of the proposed dwelling(s).

5. Nationally Described Space Standards (NDSS) Now Apply:
   All Class Q dwellings must now comply with minimum space standards, ensuring adequate living conditions for future occupants.

An example of a Class Q conversion project we have been working on Black Barn.

Book a free 20-minute Discovery Call with our studio to understand how the new Class Q rules apply to your project—and what’s realistically achievable on your site. Or feel free to send us an email if you have any questions and we will get back to you.

Class Q Permitted Developement 2025 changes