Velux / Roof Light Conversion — Simple, Beautiful, Cost-Effective
A Velux (or roof light) conversion installs roof windows flush into your existing sloped roof without changing the roofline shape. There is no dormer box, no new external wall — just high-quality, thermally efficient roof windows that bring natural light into the new space.
Because no structural changes are made to the roofline, a Velux conversion is the most cost-effective loft conversion type and is almost always approved under Permitted Development with no planning application required. It is the natural choice for properties with adequate existing headroom — typically 2.2m+ at the ridge — and for homeowners who want to create a beautiful loft space at a lower cost.
When to Choose a Velux Conversion
Adequate Existing Headroom
The key requirement is minimum 2.2m from floor to ridge. Our surveyor measures this at the free visit. Many London Victorian properties meet this criterion.
Budget-Conscious Projects
At £18,000–£26,000 fully inclusive, a Velux conversion offers an accessible entry point to creating a usable loft space.
Conservation Area Properties
Because no external change is visible from the front, Velux conversions are often the preferred planning route in conservation areas.
Speed of Delivery
Velux conversions typically complete in 4–6 weeks on site — the fastest loft conversion type.
Velux Conversion — FAQs
A Velux conversion in London typically costs £18,000–£26,000 fully inclusive of structural work, boarding, insulation, staircase, electrics, plasterboarding and finishing. Precise costs depend on the size of the roof space and your finish specification.
A Velux conversion typically adds £15,000–£35,000 in property value by creating an additional habitable room, particularly if it adds a bedroom.
A Velux conversion fits windows flush into the existing roofline without changing its shape. A dormer creates a box-shaped extension that projects vertically from the slope, adding significantly more headroom and floor space but at higher cost.
In almost all cases, no. Roof windows set within the existing slope and not projecting above it are permitted under Permitted Development for most residential properties.
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