Home Remodeling

How Much Does A Loft Conversion Cost

  By - Eagan Taylor    On Jul 18, 2025

How Much Does A Loft Conversion Cost

Are you considering adding a loft in your residential property? Well, loft conversions or simply an attic conversion may involve extensive labour and capital requirements. However, merely a roof extension or attic conversion to add a living space can cost around £3,700 to £11,500, depending on the size and design. But, for full-fledged loft conversions, whether it's loft remodelling or loft renovation, can cost from £11,500 to even £55,000, giving an average of $35,000 range. Understanding the cost variations and the factors involved is necessary before going into loft conversions to help you make an informed decision regarding your property. 

Loft Conversion Cost: Factors That Affect It And The Estimated Price 

So your decision is final? Let’s get into it then. The average cost of loft conversions varies between £11,500 to £55,000. However, a lot of factors affect the cost range. It is important to understand each of them for you to make a precise blueprint of what exactly you want from this project, as per your budget. 

Here are the factors that affect the range of the loft conversion cost: 

Factor 01: Complexity and Size Of The Loft Conversions

First of all, we have the complexity and the size of the loft conversions. From simple renovations to full-blown remodelling, and simple roof extension to proper attic conversion, every little detail makes a difference. Here is an estimated cost:

Complexity of Loft ConversionsEstimated Cost

Simple

£11,500

Medium 

£34,500

Hard 

£55,000

Moreover, if we talk about price variations between renovation vs. remodelling. Here’s an estimate of that:

Loft ConversionsWhat Does It Include?Estimated Cost

Renovation

Minor changes to add up storage or living space

£7.500 -  £26,000

Remodell

Structural and layout changes for proper attic conversion

£12,000 to  £45,000

Factor 02: Type Of Loft Conversions

Another major factor affecting the cost of loft conversions includes the type of conversion you’re going with, whether it is a dormer loft conversion or simply a dormer extension, a mansard loft conversion or simply a mansard roof extension, or a hip-to-gable loft conversion. 

Here is a detailed analysis of loft conversions and their price range. 

Types of Loft ConversionsWhat Does It Include?Estimated Cost

Dormer Loft Conversion

  • Adding a box-like structure to the existing roof

  • Creating more headroom and usable space.

£65 to  £160 per square foot

Hip-to-Gable Loft Conversion

  • Extending the sloping (hipped) side of the roof into a vertical gable end

  • Maximising space—ideal for detached, semi-detached, and end-of-terrace homes.

£180 to £400 per square foot

Hip-to-Gable Loft Conversion

  • Extending both sides of the roof to create a near-vertical wall.

  • Maximising space with structural changes—usually the most expensive option.

£250 to  £400 per square foot

Mansard Loft Conversion

  • Doing a basic conversion

  • Involving the installation of roof windows to bring in light and ventilation

£50 to £250 per square foot.

Factor 03: Materials Used For The Conversion Process

Building on the size, complexity, and type of conversion, another significant factor is the material. What type of material is used, its quality and availability in the market. All these factors play a major role in deciding the total cost of the conversion process. High-quality materials will automatically increase the cost of the project. So, choose your materials and their usage wisely.

Factor 04: Additional Services Based On the Usage of the Loft

One of the most significant factors affecting the loft conversion cost is how you’re going to use that space. Whether you need it for personal usage or want to make a home office workspace, whether you want to include an attached bathroom or just want a simple renovation, whether you need HVAC services or not, all these factors play a major role in deciding the cost of the loft conversions. 

Here’s the cost of extra services you may or may not add in the process:

Additional Service or UsageEstimated Cost (per square foot)

Simple Storage

£25 to £85

Bedroom

£50 to £250

Bedroom with an attached bath (includes plumbing)

£70 to £350

Home Office

£45 to £100

HVAC Service

£1,500 to £10,500

Factor 05: Labour Costs And Other Permit Fees

Here’s a list of other labour-related costs that you need to keep in mind:

Additional CostsEstimated Price

Plumber Costs

£1,200 to £3,000

Carpenter Cost

Around £30 to £35 per hour

Labour Cost

£150 to £400 per day per worker

Architecture’s Cost (optional)

Around 5% to 15% of the total project cost

Permit Fee

£400 to £1,500

However, did you know that if your loft conversion impacts a shared wall, you'll need to notify your neighbours? And you also need to hire a party wall surveyor? Yes. You can thank us later. This can cost you around £700 to £1,500, or more if disputes arise.

Conclusion

Thus, the cost of loft conversions depends on the size, complexity, purpose of usage, type of conversion, material used, along with major services and labour costs that you need to be mindful of. Before taking any final decision, make sure to consult all the information given above or a local contractor who can guide you throughout the project.

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FAQs

  1. What is the cost of post-loft conversion cleanup in the UK?
    Post-loft conversion cleanup can cost around £100 to £500, depending on the time taken and mess.
  2. What is the estimated time to complete a loft conversion?
    In the UK, local contractors take up to 4 to 12 weeks for a loft conversion.
  3. Is diy loft conversion better or should I hire a contractor?
    It is recommended to hire a professional contractor for a loft conversion, especially if it requires structural changes.
  4. What should I go with for my loft conversion: remodelling or renovation?
    It depends on your loft conversion requirements. If you just want to convert your attic into a habitable space, renovating is a good choice, but for proper structural changes, go for remodelling.
  5. Does a loft conversion increase home value?
    Yes, it does. A well-executed loft conversion adds up to 15% to 20% of home value.
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About Author : Eagan Taylor

Hey! I'm Eagan Taylor, I'm a versatile writer with a passion for crafting engaging and thought-provoking content. With a broad range of interests and expertise in various subjects, I can write on multiple topics about local businesses.

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