How to Convert a Barn: A Step-by-Step Guide

Thinking of converting a barn?

This step-by-step guide covers everything from feasibility and planning permission (including the latest 2025 Class Q updates) to design, construction, and final handover,

This guide is written from the perspective of an architect who specialises in barn conversions.

Why You need a barn conversion architect

Converting a barn into a unique home is a blend of architectural vision, technical expertise, and the skilled navigation of complex regulations.  Learn more about our barn architect services and how we guide clients through every stage of the process

David Nossiter specialises in transforming agricultural structures into bespoke living spaces. Here is a guide through the process:

Is your barn suitable for conversion? (feasibility assessment)

Discussing your vision and assessing the barn’s potential.

We begin by discussing your vision and assessing the barn’s potential. This stage involves:

  • Evaluating the structural integrity of the building

  • Considering the historical or architectural significance of the site

  • Reviewing local and national planning policies

  • Providing an outline of anticipated project costs

Planning permission for barn conversions (including class Q)

Exploring planning routes (including Class Q).

With a barn conversion project there are two main routes to securing approval to convert the building.

Protected buildings and land

Barns located on protected land, such as conservation areas or an Area of Outstanding Natural Beauty (AONB) have additional protections in place. Therefore it is likely that you have to apply for planning permission. I have written more detail in my posts ‘Planning Restrictions on Barn Conversions’.

If the building is listed, you will also require listed building consent.

Class Q Permitted Development

For barns that are not listed or situated on protected land it is likely that Permitted Development rights may apply. However, you should always check the particulars of each case.

Class Q is a section of Permitted Development that allows the conversion of agricultural buildings into dwellings. To find out more you can read my blog post ‘everything you need to know about Class Q’.

As of May 2025, Class Q regulations allow for more extensive barn conversions:

  • Up to 10 dwellings can be created on a single agricultural unit.
  • Maximum total floorspace of 1,000 m².
  • Individual dwelling size capped at 150 m².
  • Rear extensions up to 4 meters are permitted, provided they are on hard standing present since July 24, 2023.

These changes offer greater flexibility, but also introduce new complexities. 

The barn conversion design process - how we turn ideas into buildable plans

Creating detailed plans that respect the barn’s character.

We develop detailed plans that respect the barn’s character while meeting modern living standards. This phase includes:

  • Structural assessments.
  • Sustainable design integration.
  • Compliance with building regulations.

Barn conversion costs and pricing

Understanding the financial aspects of the conversion.

The project is drawn and specified in enough detail for tenders to be obtained and the project is sent out to potential contractors.

Construction phase: turning plans into reality

Overseeing the conversion process and ensuring quality.

As architects we act as contract administrators to oversee the conversion process, coordinating with contractors and ensuring adherence to timelines and compliance with agreed budgets. 

Final inspection & handover

Ensuring compliance with standards before moving in.

Upon completion, we conduct thorough inspections to ensure all aspects meet the agreed standards and regulatory requirements before handing over your new home.

Common challenges in barn conversions

Converting a barn presents unique challenges:

  • Structural Integrity: Assessing and reinforcing the existing structure.
  • Planning Permissions: Navigating complex regulations, especially for listed buildings.
  • Sustainability: Incorporating energy-efficient solutions.
  • Design Balance: Maintaining the barn’s character while introducing modern amenities.

Ready to transform your barn?

Ready to transform your barn? Contact us for a consultation and start your conversion journey.