Velux Loft Conversion

A velux loft conversion, sometimes called a rooflight conversion, uses windows built directly into the existing roof slope rather than changing the shape of the roof itself. This makes it the simplest and usually the most affordable type of loft conversion, since there is no new structure to build outside, just new windows, insulation, flooring and a staircase to turn the existing loft into a proper room.

Because the roof shape does not change at all, a velux conversion almost always counts as permitted development, even in conservation areas, as long as the windows do not face a public road. This makes it a fast option in terms of planning, though it does depend entirely on the loft already having enough head height to meet building regulations, since this type of conversion does not add any extra height or floor space beyond what the existing roof already provides.

This option works particularly well in older houses with a steeper roof pitch, where there is already enough room under the ridge for a comfortable ceiling height. It is often combined with a dormer on the same project, using velux windows on one roof slope and a dormer on another to bring in plenty of natural light.

Who this for

This service suits homes with a roof pitch steep enough to already offer reasonable head height, which is common in older Victorian and Edwardian properties. It is a good starting option for homeowners who want a straightforward, lower cost way to use their loft space without a large structural project.

Project Process Steps

We survey the loft to confirm there is enough existing head height to meet building regulations without any structural changes to the roof shape.

We plan the position of the new velux windows to make the most of natural light and ventilation in the finished room.

The windows are fitted into the existing roof slope, and the loft floor is strengthened where needed to take the new floor loading.

We complete the interior work, including insulation, plasterboard, plumbing and electrics if needed, followed by the staircase and final finishing.

Frequently asked questions (FAQ)

Does a velux loft conversion need planning permission?

No, in almost every case. Velux windows sit flush with the existing roof slope and do not change the shape of the roof at all, so this type of conversion is treated as permitted development everywhere, including in conservation areas, as long as the windows are not on a slope facing a public highway.

Is a velux conversion cheaper than a dormer?

Generally, yes, since there is far less structural work involved. A velux conversion does not add extra floor space or head height to the loft, it simply makes better use of what is already there, so it suits homes that already have reasonable head height rather than those needing more room.

Will a velux conversion give me enough head height for a proper room?

This depends entirely on your existing roof pitch and loft height. Many older Victorian and Edwardian roofs have a steep enough pitch to make a velux conversion work well, while newer houses with shallower roof pitches often need a dormer or another approach instead. A survey will tell you quickly which category your home falls into.

Can I combine velux windows with a dormer?

Yes, this is a common approach. Many dormer conversions include velux windows on the front roof slope alongside the dormer at the rear, giving good natural light throughout the new room without needing extra structural work at the front of the house.