Any same-sex couple who are in a civil partnership are able to convert their relationship to a marriage if they choose to.
You cannot convert an opposite-sex civil partnership to a marriage in England and Wales.
There are two ways to convert a civil partnership into a marriage:
a simple administrative process called a 'standard conversion'
a two stage process where the conversion is followed by a ceremony
'Standard conversion' process
The conversion will take less than 30 minutes. Both partners must attend a register office together - it does not need to be where they formed their civil partnership.
At the conversion appointment
All couples must attend this appointment. At the time of their appointment, the couple must present:
evidence of name, age and address
evidence of civil partnership
provide details of where they will be having their conversion ceremony (if not at the same register office)
evidence of any consents if a conversion ceremony is to take place in a religious building
The Superintendent Registrar or a Deputy Superintendent Registrar will enter details about the couple and their civil partnership into a form. The information will be used to compile a Civil Partnership Conversion into a Marriage Declaration. If no ceremony is taking place the couple will be asked to read a declaration, which they may speak out loud if they wish. The couple will sign the declaration in front of the Superintendent Registrar or Deputy Superintendent Registrar.
A conversion followed by a ceremony
If a conversion ceremony is to take place, the couple will read the declaration and sign it prior to their ceremony. Where a ceremony is taking place outside of the area where the declaration was prepared, the declaration will be sent to the register office covering the conversion ceremony. The couple are responsible for booking any venues and registrars.
The signing of the declaration can then be followed by a ceremony and a marriage certificate will be issued, at a cost of £11 each.
Standard conversions (additional fees if you wish to have a conversion ceremony)
Detained person conversions
All fees apart from attendance at approved premises are set by government.