Letterbox Parties is a UK party-planning business that helps individuals, families and organisations create memorable celebrations with less shopping and preparation. The company offers themed party boxes, packed with party essentials and delivered to customers’ doors. Customers can choose a theme and party size, then add optional extras such as tableware, bunting, banners and balloons. Themes include birthdays, milestone birthdays, engagements and baby showers, with options designed for a range of occasions.

Alongside its pre-made and build-your-own boxes, Letterbox Parties provides bespoke balloon services, including balloon stacks and arches, and runs social workshops and team-building events. The business also supports event planning, with customer feedback highlighting its venue-sourcing assistance and professional event styling. Its services are intended to make celebrations easier to organise while giving customers flexibility to personalise the atmosphere and details. Letterbox Parties promotes seasonal gifts, including Mother’s Day balloon deliveries, and shares planning ideas through its blog and video library.