Start the plan once most replies are in. A plan built on maybes gets rebuilt again and again, and the work is wasted. Your real deadline is the day the caterer needs final numbers and dietary requirements, usually two to three weeks before the wedding, so work back from that date, not from the wedding itself.
Remember the day and evening split. The typical UK wedding has about 74 people at the ceremony and about 21 more joining for the evening (Bridebook, 2026), and only your day guests need a seat at the wedding breakfast.
Round tables of eight to ten are the usual choice, easy for conversation. Long banqueting tables suit barns and country houses but make it harder to talk to people further down. Whatever the venue offers, settle the layout before you place anyone, because it fixes how many people fit and how many tables you need.
For a guide, with an average of around 80 guests, a typical wedding needs roughly eight to ten tables, depending on the shape and the room.
The traditional UK top table seats the couple with their parents, the best man and chief bridesmaid or the wedding party in a long row facing the room. It is a lot of divorced-parent maths, so many couples now use a sweetheart table, a round table with the wedding party, or a table for two among their guests.
If you keep a traditional top table, think about where each parent will sit, and about anyone who should not be sitting next to each other.
Divorced or estranged relatives are normal and are easiest to handle by seating them at tables near, but not next to, each other, each with people they like. Put a couple of easygoing, sociable people on any table with tension. They keep the conversation moving.
Group guests who share something: work, university, the same side of the family or the same stage of life. Avoid labelled tables like 'singles', which is rarely a kind idea.
Decide your plus-one rule early and apply it to everyone. Making one-off exceptions is where most seating arguments begin. If children are invited, seating them with their parents is simpler than a children's table unless there are several of a similar age.
Link every guest's dietary needs to their seat as you go, so the caterer's list and your plan match. MarryHQ's seating planner pulls dietary information straight from your guest list and lets you drag guests between tables without a limit on tables.
Send the final plan to your venue and caterer by the date they set, print the table plan and name cards a few days before, and keep a spare copy somewhere you can reach it on the day. A single late change after that is easy. Ten late changes is not.
Tasks, guests, budget, and suppliers in one place, free to start.