How Much Do Attic Conversions Cost?

Attic Conversion Cost Summary
Price Range = £14,900 to £25,700
Average Cost = £20,000
Cheapest Price = £12,500

Related Guides: Loft Conversion Cost Guide

Attic ConversionFor many homeowners, attic space is often left as half-empty storage, ignored for most of the year and ventured into only when some old, lost item needs to be retrieved from its corners. But if you’re struggling for room downstairs, why not clear out all the old stuff and turn the extra space into something practical? A loft conversion is great if you’re in need of an additional bedroom, a study or office space, or even a quiet living area where you can relax by escaping the stress of life downstairs. Plus it works out as a great investment, even adding value to your property in the long run!

Before you begin, you should first check whether or not you need planning permission for your loft conversion. Although most homes no longer do, if you live in a listed building, conservation area or are undertaking a conversion which involves some complicated re-structuring, you should definitely check with your local authority first. If you do, always wait for council approval before getting started – otherwise you may end up with a nasty fine to added on top of your final attic conversion bill. So once that’s done, it’s time to start budgeting and working out all the numbers and figures: just how much does an attic conversion cost?

Cost of Attic Conversion

Attic conversion costs vary depending on size and your design specifications but to help you get started, we’ve compiled the following list which gives a rough idea of recent attic conversion prices:

  • Structural Alterations: including strengthening via beam and joist installation, plus secured flooring and all joinery work will cost between £2,000 and £5,000
  • Insulation: roof and flooring if necessary, including all boarding and plastering will cost between £800 and £1,200
  • Windows: two small or one large velux-style skylights, double glazed will cost between £1,800 and £3,500
  • Bathroom installation: including plumbing and pipework, plus toilet and single wash-basin fittings costs between £6,000 and £8,000
  • Wiring and electrics: including all lighting facilities and two power-sockets costs between £3,500 and £5,000
  • Painting and decorating: interior design, paint, wallpaper and all minor fixtures and fittings costs between £800 and £3,000.
    • TOTAL ATTIC CONVERSION COST: £14,900 to £25,700

*All prices sourced from

Of course, these figures just outline the average cost of an attic conversion; for more specific and accurate details regarding your particular property and loft design, you should contact a fully qualified surveyor or loft conversion company to carry out a preliminary inspection to help you reach quotes more suited to your loft conversion plans.

Some other companies or price comparison websites do suggest, however, that the cost of an attic conversion can work out significantly less than the numbers listed above:

  • puts the average final price of a loft conversion at £21,000
  • says you can even get a basic attic conversion (no dormers etc) for as little as £12,500

To make sure you get the best deal possible, always compare a number of different quotes from various local and national contractors – that way you can get a perfect attic conversion professionally fitted but at a budget to suit you!

Sources:, Whatprice,, Velux, DirectGov. All prices are accurate as of December 2012.

James Keefe says:

how could painting and decorating cost £8000?
A few tins or paint, some rollers and some wall paper cost £300 and a tradesman wouldn’t charge more than £500 for a bit of painting.
Who are you using?

mjackson says:

Hi James,

Thanks for your comment.

We are always updating our articles and will review this information , correcting any errors we may find.

Mark @ Servicemagic

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