If all of the following conditions are met, no. Otherwise, yes. Conservatories attached to domestic dwellings are exempt from the Building Regulations providing:
the internal floor area does not exceed 30m²
the roof is transparent or translucent (polycarbonate or similar material which allows light to pass through)
the conservatory is constructed at ground floor level
the conservatory is separated from the rest of the dwelling by a doors and/or windows and
glass in critical locations is safety glass. “Critical locations” means up to 1,500mm from floor level in doors and side panels, and up to 800mm from floor level in windows.