Converting a conservatory roof is the point at which a conservatory can stop being a conservatory in the eyes of the regulations. That sounds like paperwork and it matters, because the exemption a conservatory enjoys is conditional, and a room that no longer meets the conditions is simply an extension that has to comply like one.
Why a conservatory was exempt, and how a re roof conservatory job changes that
The exemption for a conservatory rests on conditions: it is at ground level and below a size threshold, it is substantially glazed in its roof and walls, it is separated from the house by external quality doors or walls, and any heating in it has its own controls. Change the roof to a solid one and the substantially glazed condition is no longer met, which is the mechanism by which the work becomes notifiable. That is not a trap; it is the deal the exemption was always based on.
Converting conservatory roof work: what building control looks at
The structural adequacy of the frame, dwarf wall and foundations to carry the new roof, the thermal performance of the new roof as an element, how condensation is controlled within the build up, and whether the thermal separation from the house is being kept or removed. If the doors between the house and the conservatory come out, the room becomes part of the heated envelope and a great deal more is engaged. Many people keep the doors precisely to keep the job simpler.
Planning permission, which is a separate question
Planning and building control are different regimes. Changing a conservatory roof usually does not need planning permission on an ordinary house, because it is not enlarging the building, though a significant change in height or appearance, a listed building, a flat or a conservation area can all change that. The safest route where anything is unclear is a quick check with the local authority before ordering materials with a lead time.
Getting the paperwork, and why it matters later
Whether the installer self certifies through a competent person scheme or the job goes through building control, there should be a completion certificate at the end with your name on it. Conveyancing solicitors ask for it, and a converted conservatory with no paperwork is a routine cause of delay and retention on a sale. Ask at quotation stage who is certifying, and do not accept the answer that a conservatory never needs anything.
Questions people ask about convert conservatory roof
Does changing a conservatory roof need building regulations approval?
Usually yes when going from glazed to solid, because the conservatory exemption depends on the roof being substantially glazed. Like for like glazed replacement often does not.
Do you need planning permission to change conservatory roof coverings?
On an ordinary house usually not, since nothing is being enlarged. Listed buildings, flats, conservation areas and significant changes in height or appearance are the exceptions worth checking.
Can I remove the doors between the house and the conservatory?
You can, and it changes the job substantially, because the room becomes part of the heated envelope rather than a separated space. Many conversions deliberately keep the doors to stay inside the simpler route.
What happens if the work was never certified?
It commonly surfaces during a sale. A regularisation application through the local authority is the usual remedy and it is easier to get the certificate at the time.