A Velux loft conversion, sometimes called a roof light conversion, is the most affordable way to turn your loft into a proper room. Instead of changing the shape of the roof, we fit roof windows into the existing slope, strengthen the floor, add a staircase and fit out the space.
At ST Lofts, Velux conversions start from around £30,000. The price for your home depends mainly on the size of your loft and the head height you have to work with, and you can get an instant figure for your own loft using our loft conversion cost calculator.
The cost calculator gives you a guide price in minutes. For an exact price, book a free survey. We’ll come out, look at your loft, talk through what you’d like and then send you a full, itemised quote.
There’s no obligation, and if you’d rather talk it through first, give us a call or send us a WhatsApp.
Our Velux conversion price covers the full build, not just the windows. It typically includes new structural floor joists, roof windows fitted flush with your existing tiles, insulation to current building regulations, a new staircase, electrics, plastering and building control sign-off.
Because the roof structure stays largely as it is, there’s less structural work than with other types of conversion. That’s what keeps the cost down and the build time shorter, usually around six to eight weeks on site.
A few things have the biggest effect on what a Velux conversion costs:
A Velux conversion works best when your loft already has good head height, ideally around 2.2 metres or more from the top of the ceiling joists to the ridge. Many Victorian and Edwardian houses in Bristol, with their steeper roofs, are a good fit.
If your loft is lower than that, a dormer usually gives a better result, because it builds extra headroom rather than relying on what’s there. Our guide to dormer vs Velux conversions goes through the differences in more detail.
Dormer Loft Conversion Cost
From around £40,300
Hip to Gable Loft Conversion Cost
From around £42,000
L Shaped Loft Conversion Cost
From around £39,600
Mansard Loft Conversion Cost
From around £37,400
Not sure which type suits your home? Our cost calculator lets you compare all five side by side.
Our free online calculator gives you an instant price for a velux loft conversion based on the size of your loft, with options for an en-suite, extra windows and more.
When you’re ready, we’ll arrange a free, no-obligation survey and give you a full, itemised quote.
Common questions about the cost of a velux loft conversion.
Velux conversions with ST Lofts start from around £30,000. The final price depends on the size of your loft, head height and any extras such as an en-suite or extra windows. Use our cost calculator for an instant price for your loft.
Usually, yes. Because the roof shape stays the same, there’s less structural work than with a dormer, hip to gable or mansard conversion. It only works well if you already have enough head height.
Most Velux conversions don’t need planning permission, as roof windows usually fall under permitted development. Building regulations approval is always needed. See our guide to planning permission for loft conversions in Bristol.
Most Velux conversions take around six to eight weeks on site, making them the quickest type of loft conversion we carry out.
