Osea Island, The Powerhouse

Osea Island, Maldon, CM9 8UH -

Up to
250 guests

About Venue

An enchanting private island with a variety of properties, event venues, beaches, land and beautiful nature on London’s doorstep.

Our collection of properties range from grand houses to cosy cottages and apartments and our event venues are historic and quirky.
Osea is an eclectic, rustic and extraordinary experience and a blank canvas for creating memories that will live on for years to come.

A lofty grand space formally housing the islands electricity power station. The Power House is a blank canvas which can be styled to make any event sparkle.

Capacity & Layout

Standing

up to 250

Dining

up to 120

Boardroom

up to 180

Facilities & Amenities

Public transport

Premises parking

Overnight accommodation

Space Rules

Cancellation policy

100% refundable 1 day before the event

Location

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Reviews

Elizabeth Santos
August 2025
To say the Osea island team exceeded all expectations and standard of service is an understatement. Not only was the 3-day wedding we organised with them a mindblowingly magical occasion (family, guests and crew feedback alike) but their level of logistical expertise, event understanding, and love of the island elevated it to another level. If you want a unique venue, book it whilst you can.
N Wills
July 2025
Had the most amazing work summer party on Osea Island, everything from start to finish was perfection. A big thanks to Fleur, Carlie, Alex and the Osea team for looking after us. You really do feel as if you are on holiday here, this will be a summer party for the history books!
Molly Scotton
October 2025
Beautiful, unique location for our company offsite. It made for a very special and exclusive team gathering. We had plenty of space for our activities. The service from all staff on the island was exceptional. Thoroughly recommend!