Founded by Alex Hunter in 2019, the business will relaunch as a 40-cover bistro-style seafood restaurant alongside an expanded retail offer.
Nick Marsden, who joined the business in 2024, will continue to lead the kitchen, having taken over from Leo Carreira.
His previous roles include Dovetale, Pitt Cue and The Laughing Heart.
Snacks and raw bar options will include smoked eel consommé with horseradish, pickled Fowey mussels with melon and lovage, and oysters served with cucumber and apple vinaigrette, with caviar available at £1 per oyster.
Small plates will include cuttlefish with pickled salsify and cauliflower purée, and confit sea trout with white asparagus and mustard greens. Larger dishes will include skate wing with Trombetta courgette, nettle and Gordal olives; grilled half Cornish lobster with vin jaune sabayon and brown butter; and whole plaice with puntarelle, broad beans and mint.
Desserts will include potato ice cream with preserved spruce and smoked eel; Okinawa sugar tart with pumpkin seed praline; and chocolate crémeux with blackberry and Assam pepper.
The drinks list will focus largely on white wines, alongside sparkling wines, Old World whites, and a smaller range of reds, orange wines and saké.
Cocktails will include The Red Snapper (Gin Mare, spiced tomato mix and lemon), Fish House Punch (Cognac, crème de pêche, Earl Grey tea, lemon, sugar and clarified milk), a Pink Peppercorn Negroni and a Yuzu Spritz.
The retail space will feature dry-ageing cabinets for fish, oyster shucking and displays of shellfish, molluscs and whole day boat fish.
Prepared lunch boxes will include sashimi sets and shellfish rolls, as well as oven-ready dishes such as miso black cod and Singapore chilli crab.
As with the current site, seafood will be supplied by The Sea, The Sea’s sister wholesale fish business, based under a railway arch in east London.
The new site will also include a 10-seat seafood bar in the evening and a 28-cover outdoor terrace.
Hunter said the move to Pavilion Road marks the next stage of the business’s expansion in Chelsea.
“It’s been an incredible and rewarding seven years seeing the response to The Sea, The Sea, and now being able to expand the business with this new chapter. I love being in Chelsea, and when the opportunity to open in a bigger site on Pavilion Road came along, it made sense. The Sea, The Sea has always been a stage to showcase our talented team and ethos of working with ethically sourced seafood direct from small boats around our shores.”