Buildings can be certified for both worship and marriage. There is a different process if you want to apply for an approved premies license to hold civil ceremonies.
Certify a building to be a place of worship
You can certify a place of meeting for religious worship under the Places of Worship Registration Act 1855.
Certify a place of meeting for religious worship: form 76 on GOV.UK.
Certify a place of worship to hold marriage ceremonies
You can also apply to certify a place of worship to hold marriage ceremonies.
Certify a place of worship for marriage: form 78 on GOV.UK.
Apply to be an authorised person able to conduct marriage ceremonies
One year after a building has been registered for the solemnisation of marriages, the trustees or governing body can appoint an authorised person to attend marriages and sign the marriage schedule without the need for a registrar from the register office to attend.
Contact customer services: Haringey Register Office
Haringey Register Office
George Meehan House
294 High Road
Wood Green
N22 8JZ
United Kingdom