There is no common standard or even a general conservation flat rooflight/skylight product on the market; The reason being, they do not sit flush to the roofline. Even though some flat rooflights are named and marketed as a conservation product this does not mean that they will necessarily be accepted on your heritage building.
You will need to contact your conservation officer and find out what specification of flat rooflight you are allowed to have fitted to your property. As flat rooflights should be fitted to a kerb upstand it is not possible to have a flush fitting design on a standard flat roof application.
With the kerb requirement usually being a minimum of 150mm high it may well be visible from ground level. As such, your Conservation Officer should be able to provide further guidance as to what they are looking to approve on your project. It might be that they require a steel frame rather than aluminium, have glazing bars instead of a single unit, insist on a black external frame or any number of other items. Their requirements will ultimately determine which type of flat skylight product you can use.
We would always recommend speaking to your local conservation officer before making any decisions and purchases.
Do I need building regulations approval
Whether you need planning permission to install your new roof windows or not, you must still follow any relevant building regulations outlined in the Planning Portal, and seek building regulations approval for any work you have carried out.
By law, all modifications to buildings must comply with these regulations, which highlight the minimum legal standards for design and safety.
Adding new or altering existing roof windows can undermine the integrity of the building, so special care must be taken to ensure that the roof continues to perform as it should and meet all building regulations requirements. This is because:
- The roof structure will likely need to be altered to create the opening.
- The roof will have to carry the weight of the new skylight and may need to be strengthened.
- The roof window must be sufficiently insulated for energy efficiency.
- Unplanned movement can occur as a result of any structural works.
Please note: If the work is being carried out by a professional tradesperson who is registered with a competent person scheme, they can self-certify that any works meet the building regulation standards themselves.
Do you need planning permission for a roof lantern?
Roof lanterns are slightly different to skylights and pitched roof windows because they are much larger and take up more of the roof. That makes them great for allowing the most light into your loft conversion or extension, and they’re a very appealing option for opening up small spaces. But as so much work needs to be done to install them, you might be wondering whether you need planning permission for a roof lantern.
The good news is that most roof lanterns are permitted development and don’t require planning permission — just building regulations approval. Of course, this depends on whether your property is in a conservation area or not, and the roof lantern must not exceed the height of your existing roof. In these instances, you should seek planning permission.