Conservatories and porches are not covered under the FENSA scheme because under the Building Regulations they are generally not considered to be part of the thermal envelope of the property. ... The installation would need to be referred to the relevant Local Authority Building Control, not the FENSA scheme.

Do I need a completion certificate for a conservatory?

It may be that your conservatory is exempt under the building regulations (most are) and therefore a completion certificate is not required. There are a number of conditions to satisfy in order to make a conservatory exempt.

What is covered by FENSA?

A FENSA certificate covers the REPLACEMENT of external windows, doors, roof windows and roof lights against the relevant Building Regulations in domestic properties on the original foot print of the property where the use or size of rooms have not been altered.