How Much Does a Loft Conversion Cost?
- Catherine Allen
- Feb 12
- 3 min read
Updated: Mar 17
A loft conversion is a fantastic way to add extra living space and value to your home, but one of the most common questions we get asked is: How much does a loft conversion cost?
The price of a loft conversion can vary depending on the type of conversion, materials used and any additional features required. In this guide we’ll break down the costs and help you understand what to budget for in 2025.
How Much Does a Loft Conversion Cost in 2025?
A loft conversion in the UK varies in cost depending on the type and complexity of the project. A simple loft conversion of 20m2 (215.3 square feet) can cost between £20,000 to £30,000 while more extensive and luxurious conversions can cost upwards of £50,000 or more.
Here's a rough estimate of costs based on different types of loft conversions and cost per m2:
Basic loft conversion (standard finish) - £1,200 – £1,800 per m2
Velux (Rooflight) Loft Conversion – £1,000 – £1,500 per m2
Dormer Loft Conversion – £1,500 – £2,500 per m2
Hip-to-Gable Loft Conversion – £1,200 – £2,000 per m2
Mansard Loft Conversion – £1,800 – £3,000 per m2
Learn more about loft conversion types here:
Each type of conversion has its own requirements which can affect the overall price so it’s best to request a bespoke quote for your home.
Breakdown of Loft Conversion Costs
A loft conversion involves several different elements each contributing to the final cost:
Structural Work – £10,000 - £30,000
Reinforcing the existing floor
Installing steel beams
Adding stairs to access the loft
Insulation & Roofing – £3,000 - £7,000
Insulating for energy efficiency
Replacing or reinforcing the roof
Windows & Skylights – £1,000 - £5,000
Velux windows, dormer windows or Juliet balconies
Heating & Electrics – £2,500 - £6,000
Extending central heating system
Installing lighting, plug sockets and ventilation
Plumbing (if adding a bathroom) – £4,000 - £10,000
Pipework installation
Fixtures such as toilets, sinks and showers
Plastering & Finishing – £3,000 - £10,000
Plastering and decorating walls
Flooring and skirting boards
Planning & Architect Fees – £1,000 - £5,000
Drawings, planning applications (if required)
Building regulation approvals
How Have Loft Conversion Prices Changed in Recent Years?
Material and labour costs have risen over the last few years due to supply chain issues and increased demand. Prices in 2025 reflect these changes so it’s advisable to plan and budget accordingly. At The Loft Build Company we provide transparent pricing and expert advice to ensure you get the best value for your investment.
How to Budget for Your Loft Conversion
Only get quotes from reputable loft conversion specialists
Factor in extra costs for unexpected structural changes
Consider long-term savings with energy-efficient insulation and windows
Speak with Emmet and his team at The Loft Build Company for tailored advice
Final Thoughts
A loft conversion is an excellent way to enhance your living space and add value to your property. Costs can vary significantly based on the type of conversion and additional features but with careful planning and expert guidance from Emmet and our experienced team we can help bring your dream loft to life.
FAQ's about Loft Conversions...
We've also put together several guides for the most common questions we are asked when it comes to loft conversions. Read them here:
Let's talk!
If you're considering a loft conversion contact The Loft Build Company today for a consultation and a detailed quote tailored to your needs.
0208 129 0976
