Loft Conversion Cost in 2024

Understanding the loft conversion cost in the UK is essential for anyone planning to convert their unused attic into a liveable area. Doing this is the first step in creating a value-adding space for your home.


With the ever-increasing UK property prices, unused home space is more appealing than ever. And a loft conversion is one of the best options out there. Choosing a loft conversion is often a better financial choice than other extensions. Other extensions can take up outdoor space or require basement development, which are more complex, expensive, and offer less return.


Below, our guide on loft conversion costs will navigate the costs of a loft conversion in the UK. This will give you a general idea of the cost so you can better understand how much you should be paying.

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Introduction to Loft Conversion Costs

Understanding the Basics of Loft Conversion

It’s important to understand that the average loft conversion cost depends on the loft’s size and the conversion’s complexity.


Here’s a breakdown of what you might expect to pay:

  • Small Loft Conversions: For a basic, small loft conversion, costs are usually between £15,000 and £17,000.
  • Mid-Sized Loft Conversions: If you’re considering a mid-sized loft conversion for a double bedroom with two windows, the average price falls between £18,000 and £25,000.
  • Large Loft Conversions: Those looking to create a large double bedroom with an ensuite should expect to invest between £25,000 and £40,000.

Importance of Accurate Cost Estimation

Understanding the average cost of a loft conversion is a good starting point. However, you need accurate cost estimation for a successful loft conversion project. Here’s why:

  • Budget Management: Accurate cost estimates help you allocate your budget effectively. This helps avoid unexpected expenses that can arise during the loft conversion project.
  • Financial Planning: Financial planning benefits from knowing the precise price in advance. It ensures you have the necessary funds to complete the project without financial strain.
  • Project Feasibility: Accurate estimates determine the feasibility of the project. They help you decide whether the loft conversion is viable for your home.
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cost of a loft conversion

What Affects the Cost of a Loft Conversion?

Key Factors Influencing Loft Conversion Costs

Knowing the key factors that influence attic conversion costs in the UK is essential for planning your renovation. Here are the crucial elements:

  • Type of Conversion: The choice between Velux, Dormer, Hip-to-Gable, and Mansard conversions impacts cost. Velux is typically the least expensive, while Mansard is the most costly.
  • Tradesmen Required: Your loft space will need professionals like plasterers, electricians, plumbers, and carpenters, with rates ranging from £20 to £120 per hour.
  • Window Type: The cost varies depending on the size and type of windows, from a more affordable 50×50 dormer to a pricier 180×78 Velux.
  • Flooring Type: Choices like vinyl, wood, carpet, or tile for your new room, bedroom, or bathroom will have different price tags.
  • Insulation Type: The price of insulation varies, whether it’s per m2 sheet, loose-fill, or blanket insulation.
  • Stairs Type: Options range from basic stairs to custom designs, alternating treads, ladders with bannisters, or even spiral staircases, each with unique costs.
  • Extra Costs: Factors such as architects, roof joists, roof tiles, bat surveys, building regulations, and party wall surveys might be necessary for your type of conversion, adding to the overall cost.

Regional Cost Variations: London vs Other UK Regions

When it comes to the average cost of a loft conversion in the UK, your location can have a large impact, particularly in London. Here, costs for renovating a loft are higher than in other regions. But why does London stand out in this way?


Key reasons include:

  • The majority of specialists, such as architects and builders based in or near London, tend to charge higher rates.
  • Transporting materials in London incurs additional costs. This is because of factors like parking fees and congestion charges.
  • A wide variety of properties in London often requires more specialised attention, which can increase costs.


These factors contribute to the noticeable difference in extension costs between London and other UK regions. For a clearer picture, consider these average costs:

  • The average cost of a loft conversion in London: £60,000 – £100,000
  • The average cost of a loft conversion outside of London: £50,000 – £70,000


Understanding these regional variations is crucial for budgeting your loft conversion project.

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Average Cost Of Loft Conversion in the UK

The average price of a loft conversion in the UK varies, costing around £50,000 to £100,000 or more. Several key factors influence this estimate, including the size and type of loft, your location within the UK, and specific internal requirements. Each of these elements plays a role in determining the cost of your loft conversion project.

Overview of Average Costs for Different Types of Loft Conversions

Type of Conversion

Average Cost

Velux Loft Conversion


Dormer Loft Conversion


Hip-to-Gable Loft Conversion


Mansard Loft Conversion



When considering loft conversion prices, expect to spend between £40,000 and £100,000 on average. This range, however, is influenced by several factors that can either increase or decrease the cost of a loft conversion. These include:

  • Your location
  • Size of the conversion
  • The type of loft conversion
  • Quality of build and materials


In fact, the actual price of loft conversion can vary widely, from as low as £25,000 to as high as £200,000!

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Material Costs: Stairs, Flooring, and Insulation

Loft Conversion Stairs (Average Cost per M2)


Average Cost per M2

Fixed ladder with Bannister


Alternating Treads









Loft Conversion Flooring (Average Cost per M2)


Average Cost per M2










Loft Conversion Insulation (Average Cost per M2)


Average Cost per M2








Labour Costs: Tradesmen and Professional Fees


Average Cost per Hour













Additional Costs: Planning, Surveys, and Permissions

ServiceCost Range
Building regulations£40 to £800
Moving a water tank£100 to £200
Party wall survey£150 to £200
Bat survey£300 to £400
Roof cleaning£300 to £600
Replacing roof tiles£170 to £500
Plans drawn up by architects£400 to £1,500
Roof joists£500 to £1,000
House exterior repainted£550 to £1,500
Underfloor heating£800 to £7,700
Boarding and insulating loft£1,500
New boiler£1,500 to £3,500
House render£2,000 to £8,000
House cladding£2,500 to £6,500
Wet room£4,000 to £7,000

Types of Loft Conversions and Their Costs

Type of Conversion

Average Cost


Velux Loft Conversion


4-6 weeks

Dormer Loft Conversion


6-8 weeks

Hip-to-Gable Loft Conversion


6-8 weeks

Mansard Loft Conversion


8-10 weeks


Velux, Dormer, and Mansard Loft Conversion Costs

Velux Loft Conversion

The Velux option is the basic loft conversion cost in the UK. It typically involves installing Velux windows to bring more light into your space. This loft extension is a straightforward way to convert your loft, with an average cost of £15,000 and can be completed in 4-6 weeks.


  • Cost: £15,000
  • Typical Job Time: 4-6 Weeks
loft conversion cost uk
average cost of loft conversion

Dormer Loft Conversion

Dormer conversions, popular in the UK, often include a small flat-roofed extension with a window. The dormer loft conversion cost varies, but a standard dormer averages around £20,000. For two bedrooms and an ensuite, prices range from £35,000-£40,000.


  • Cost: £20,000 – £40,000
  • Typical Job Time: 6-8 Weeks

Mansard Loft Conversion

A Mansard loft conversion involves significant renovations, including replacing one side of the roof. This extensive loft conversion price in the UK typically requires planning permission and costs between £45,000-£75,000.


  • Cost: £45,000-£75,000
  • Typical Job Time: 8-10 Weeks
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cost of loft conversion uk

Hip to Gable and Modular Conversion Costs

Hip to Gable Loft Conversion

This conversion extends space by transforming a hipped roof into a gable wall. The hip-to-gable loft conversion cost averages between £42,000 and £60,000.


  • Cost: £42,000-£60,000
  • Typical Job Time: 4-8 Weeks

Modular Loft Conversion

Modular lofts are pre-fabricated and installed on-site, offering a time-saving option for a new loft. This method costs between £45,000-£60,000.


  • Cost: £45,000-£60,000
  • Typical Job Time: 2-3 Weeks


These options provide a range of solutions to convert your loft, each with its unique features and costs.

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average loft conversion cost

Loft Conversion Cost Per m2

When starting to plan your loft conversion, it’s helpful to understand the costs per square meter:


  • Velux: approximately £430 – £595 per m2
  • Dormer: approximately £1080 to £1547 per m2
  • Hip-to-gable: approximately £1080 to £1547 per m2
  • Mansard: approximately £1547+ per m2

Calculating Costs Based on Size and Complexity

To estimate the total cost of your loft conversion, multiply the chosen conversion type’s cost per m2 by the size of your loft space. For instance, if you opt for a Dormer loft conversion for a 20m2 space, the calculation would be:


Cost per m2 (Dormer) x Size of Loft = Total Cost 

£1080 (minimum) x 20m2 = £21,600 

£1547 (maximum) x 20m2 = £30,940 


This example shows a rough estimation of the loft conversion prices in the UK, ranging from £21,600 to £30,940 for a 20m2 Dormer conversion. Remember, the final cost can vary based on the complexity of the project and the quality of materials used.

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Managing Your Budget: How to Reduce Loft Conversion Costs

  • Evaluate Your Space Needs:
    • Assess if a straightforward roof light conversion, typically the most cost-effective option, suffices for your space requirements.
    • If your loft has sufficient height, consider avoiding extensive modifications. Working within the existing dimensions can lead to significant savings.
  • Opt for a ‘Shell Loft Conversion:
    • Ideal if you’re skilled in DIY or confident in project management.
    • Hire a builder for the structural work like dormers and floor joists.
    • Post-structural work, either take over the finishing yourself or hire specific trades for tasks like plumbing or electrical work.
  • Cost-Effective Alternatives to Windows:
    • Recognise that adding windows, particularly dormer windows, can be costly.
    • Explore budget-friendly options such as sun tubes for natural lighting.
  • Smart Selection of Finishes:
    • Be judicious in choosing finishes, especially for areas like bathrooms where the cost can vary greatly.
    • Regularly hunt for deals or consider using reclaimed materials.
    • Keep an eye out for seasonal sales to get high-quality materials at a lower cost.
  • Focus on Economical Choices Initially:
    • Prioritise cost-effective elements in the early stages of your loft conversion.
    • Plan for future upgrades in decor or fixtures when your budget allows. This approach helps manage the loft room cost.
  • Regularly Review and Adjust Your Budget:
    • Continuously monitor your spending throughout the project.
    • Be prepared to make adjustments to your plan to stay within budget.
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DIY vs Professional Services: What to Consider



Professional Services


Lower upfront costs

Higher upfront costs


Dependent on personal skill

Typically, higher, professional quality

Time Investment

High, requires more personal time

Less personal time is required

Expertise & Experience

Limited to individual’s ability

Professional expertise and experience


Higher risk of mistakes

Lower risk, usually insured

Long-term Outcomes

Potentially lower quality finish

More reliable and durable finish


average cost of a loft conversion

Effective Budgeting and Cost-Saving Tips

Smart budgeting is key for a cost-effective loft conversion. Here’s how you be more cost-effective. 

  • Compare quotes: Always get multiple quotes to ensure competitive pricing.
  • Prioritise needs: Focus on essential features over luxury additions.
  • Source materials: Look for deals or reclaimed materials to reduce costs.
  • DIY where possible: Undertake simpler tasks yourself to save on labour costs.
  • Plan thoroughly: Avoid costly changes mid-project by having a detailed plan.
  • Monitor spending: Keep track of all expenses to avoid going over budget.

With these strategies, you can effectively manage the cost of loft conversion, ensuring a successful project without overspending.

The Legal and Regulatory Aspects

Planning Permissions and Building Regulations

When undertaking a loft conversion, it’s crucial to be aware of the planning permissions and building regulations that apply.


Planning permissions are necessary if you’re making significant changes to the structure of your home, such as altering the roof shape or height. It’s always advisable to check with your local council for specific requirements, as these can vary by location.


Building regulations, on the other hand, are essential to ensure that the construction work meets safety and design standards. These regulations cover structural integrity, fire safety, insulation, and access. Obtaining approval for these regulations is a must to ensure your loft conversion is legally compliant and safe.

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loft conversion cost uk 2024

Understanding Party Wall Agreements

If your home is semi-detached or terraced, you’ll likely need to consider a Party Wall Agreement. This agreement is necessary when you share a wall (party wall) with your neighbours. Before starting any work that affects the shared wall, you’ll need to inform your neighbours and obtain their consent.


This agreement ensures that any work done will not negatively impact the adjoining property and helps prevent disputes. Properly understanding and adhering to these legal and regulatory aspects is key when planning your loft conversion.

Advantages of Loft Conversions

Adding Value to Your Property

One of the primary benefits of a loft conversion is the potential increase in your property’s value. Whether it’s a hip-to-gable loft conversion, a dormer loft conversion, or a shell loft conversion, each one can boost your home’s market value.

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Enhancing Living Space and Aesthetics

Another advantage is the enhancement of living space and aesthetics. Converting your attic into a new loft or adding an ensuite can transform your home. However, remember, The size of the loft and the type of loft conversion you choose will determine how much extra space you can create.

Customisation and Flexibility

Loft conversions offer a high degree of customisation and flexibility. You have the freedom to design the space according to your specific needs. With the help of conversion experts or a loft conversion specialist, you can tailor every conversion aspect, from the layout to the finishes. 

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average price of a loft conversion

Choosing Fittra for Your Loft Conversion

Why Choose Fittra: Advantages and Services Offered

Fittra is a construction company that stands out in the loft conversion market with a range of client-focused services and assurances:

  • Free Consultation: Fittra offers free consultations at all stages of your loft conversion project. This ensures that your ideas and requirements are fully understood and incorporated.
  • 24/7 Communication: You get constant access to your project manager, ensuring open and continuous communication throughout the project. This 24/7 approach keeps you in the loop and helps manage any issues promptly.
  • £10M Employer’s Liability Insurance: Fittra provides a high level of employer’s liability insurance, giving you peace of mind regarding safety and risk management on your project.
  • Free Schedule of Works: They offer a free, detailed schedule of works, laying out every step of the project. This transparency helps you understand the process and timelines involved in your loft conversion.

Professional Approach and Quality Assurance by Fittra

Fittra’s commitment to quality and professionalism in the London house renovation market is ensured by quality.


  • Trade Discounts: Clients benefit from Fittra’s trade discounts, which can significantly reduce the overall cost of materials and services.
  • £5M Public & Products Liability: With substantial public and product liability coverage, Fittra ensures that all aspects of their work and the products used are fully insured against any unforeseen issues.
  • 10% Only Deposit Payments: Fittra requires only a 10% deposit, making it easier for clients to manage their finances throughout the loft conversion process.
  • Detailed Cost Breakdown: They provide a detailed breakdown of all costs involved, ensuring complete transparency and helping you to budget effectively for your project.
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Loft Conversion Quotes with Fittra

Interested in transforming your loft with Fittra? Reach out for a detailed quote and begin a journey to enhance your home with a professional and reliable loft conversion.


Contact Fittra today to get your loft conversion project started with a team that promises quality, transparency, and a customer-focused approach.



Why Work With US

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at all stages

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liability insurance

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Integrated, In-house Team Will Work On Your Project

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Benefits from our trade discounts
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£5M public & products liability
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10% only deposit payments
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Detailed cost breakdown

In the End You Will Get




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FAQ: Common Questions About Loft Conversion Costs

How Much Does a Basic Loft Conversion Cost?

A basic loft conversion typically ranges from £15,000 to £30,000 in the UK. This cost varies based on loft size, conversion type, and material quality.

Can I Get a Loft Conversion on a Budget?

Absolutely. Opting for simpler designs, reducing structural alterations, and using cost-effective materials can help keep your loft conversion within budget.

What are the Hidden Costs of a Loft Conversion?

Hidden costs can include planning fees, structural reinforcements, insulation upgrades, unforeseen structural issues, and design or material changes. It’s wise to have a contingency budget.

How Long Does a Typical Loft Conversion Take to Complete?

The duration ranges from 4 to 10 weeks, depending on the conversion’s complexity. Simpler types like roof light conversions may be quicker, while extensive changes typically take longer.

Do Loft Conversions Require Maintenance, and What are the Long-term Upkeep Costs?

Like any home addition, loft conversions need regular maintenance. Long-term costs involve maintaining new electrical systems, window upkeep, and fixture repairs.

How Does a Loft Conversion Impact Home Insurance Premiums?

Loft conversions can increase home insurance premiums due to higher rebuild costs. Always inform your insurer about the conversion to ensure appropriate coverage.

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