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How Much Does it Cost to Convert a Loft?

Loft conversions are a popular choice for homeowners looking to maximise the space in their homes and add value to their property. Whether you need an extra bedroom, a home office, or a recreational area, converting your loft can provide the perfect solution. However, one crucial aspect to consider before embarking on a loft conversion project is the cost involved.
In this article, we will provide you with a detailed breakdown of loft conversion costs, helping you make an informed decision.
Please note that this guide will give you a ballpark figure for a loft conversion but the final quote can vary depending on factors like your heating system, if you need to sacrifice a room, existing structural features and much more.


Loft conversions have become increasingly popular due to their ability to transform underutilised attic space into functional living areas. Not only do loft conversions provide additional rooms but they also enhance the value of a property. However, it’s essential to have a clear understanding of the costs involved in such a project to plan your budget effectively.

Loft Size and Type

Several factors influence the overall cost of a loft conversion project. Understanding these factors will help you estimate the expenses accurately.

Design and Complexity

The design and complexity of your loft conversion project will impact the costs. Customised designs or intricate architectural features may require additional materials and labour, resulting in higher expenses.

Planning Permission and Building Regulations

Obtaining planning permission and adhering to building regulations can incur additional costs. It is essential to consult with local authorities to ensure your loft conversion meets the necessary legal requirements. At Oakley Green, we will help with every aspect of the design and build process including obtaining planning permission and liaising with Building Control.

Structural Work

Structural modifications may be required to ensure the loft is structurally sound and complies with building regulations. Any necessary structural work will add to the total cost.

Material Quality

The quality of materials used in your loft conversion will impact the cost. Higher-quality materials may have a higher price tag but can offer superior durability and aesthetics.

Additional Features

The inclusion of additional features, such as en-suite bathrooms, staircases, or built-in storage, will increase the overall cost of the loft conversion project.

Types of Loft Conversions

There are several types of loft conversions, each with its unique characteristics and costs. Understanding the differences will help you choose the most suitable option for your needs and budget.

Roof Light Conversion

Roof light conversions, also known as Velux conversions, involve the installation of roof windows to maximise natural light. They are the simplest and most cost-effective type of loft conversion.

Dormer Conversion

Dormer conversions involve creating additional space by extending the existing roof vertically. Dormers provide more headroom and floor space, making them a popular choice for homeowners.

Hip-to-Gable Conversion

Hip-to-gable conversions involve extending the sloping side of a property’s roof to create a vertical wall or “gable.” This type of conversion is suitable for properties with hipped roofs.

Average Costs for Different Types of Loft Conversions

The cost of a loft conversion will vary depending on the type chosen. Here are the average costs for each type:
Roof Light Conversion. Average cost: £35,000 – £45,000
Dormer Conversion. Average cost: £45,000 – £55,000
Hip-to-Gable Conversion. Average cost: £60,000 – £80,000
Please note that these figures are estimates, and actual costs may vary based on various factors.


Loft conversions provide an excellent opportunity to optimise space and increase the value of your property. By understanding the factors influencing loft conversion costs and considering various options, you can plan and budget effectively for your project. Remember to obtain multiple quotes, prioritise simplicity, and make informed decisions about materials and design.

Frequently Asked Questions (FAQs)

In most cases, loft conversions can be carried out under permitted development rights. However, certain conditions and limitations apply, so it’s advisable to consult with local authorities or a planning consultant. We will take care of this entire process for you.
The duration of a loft conversion project depends on various factors, such as the size, complexity, and type of conversion. On average, it can take anywhere from 6 to 12 weeks.
Yes, it is possible to include a bathroom in your loft conversion. However, additional considerations, such as plumbing and ventilation, need to be taken into account, which may increase the overall cost.
Yes, a well-executed loft conversion can add significant value to your property. It provides additional living space and improves the overall appeal and functionality of your home.