Choosing an officiant is the one supplier decision where the product is entirely a person. There is no equipment list, no portfolio of physical work and no package to compare: what you are buying is somebody's judgement, their voice and their reliability on the one morning it cannot be repeated. That makes the questions you ask far more useful than any price comparison, and it makes booking early more important than it is anywhere else.
Start with the legal route, not the person
Before you speak to anybody, establish how the marriage becomes legal where you are marrying, because it decides who you can even consider. In England and Wales a registrar has to conduct a legal ceremony, so a celebrant is an addition rather than an alternative and you are booking two things. In Scotland a registered celebrant can conduct a legally binding ceremony on their own. In the United States it varies state by state, and the rules on who may solemnise a marriage and how quickly the licence must be returned are set locally. Getting this straight first saves an expensive misunderstanding later, and it tells you immediately whether your budget needs one officiant line or two.
The questions that actually separate candidates
Ask how they write a ceremony and how much of it comes from you. Ask to read something they have written, since a sample ceremony tells you more in five minutes than any conversation about style. Ask how many meetings are included and whether the rehearsal is one of them. Ask what happens if they cannot attend, because a single person with no deputy is a real risk on a fixed date. Ask whether they have worked at your venue, or will visit it, since the acoustics of a barn and the sightlines of a garden change how a ceremony has to be delivered. And ask about travel, because it is the most common surprise line on an officiant invoice.
Book earlier than you think
An officiant can only be in one place, so the constraint is absolute rather than commercial: there is no version of the diary where a popular celebrant does two Saturdays in June. Couples routinely book a venue and a photographer a year out and then start looking for an officiant six months before, by which point the shortlist has already gone. If a particular person matters to you, book them as early as you would book the photographer, and be aware that a midweek or out of season date makes the whole problem disappear and costs less as well, which is visible in the published fees in this record.
Questions people ask about officiant for wedding
How do I check somebody is any good?
Read a ceremony they have written and speak to them on a call before booking. Reviews tell you they turned up; a written sample tells you whether their voice is one you want reading your vows back to you.
Should the officiant come to the venue first?
It helps a great deal, particularly outdoors and in large rooms, and some include a visit while others charge for it. Ask which, because the difference shows on the day in the small things like where everybody stands.
What if we want a religious element?
Say so in the first conversation. Celebrants vary widely in what they will include, and a mismatch discovered late is awkward for everybody, whereas one discovered early simply changes who you book.
How much should we budget?
For a statutory ceremony, the published fee schedule of the registration service and nothing else. For a celebrant, the two published fees in this record bracket the usual British range, and the day of the week moves it more than anything except travel.