Restaurant in Double Bay, Australia
Knox Street coffee stop, no bookings needed.
Twenty-One Espresso is a Knox Street café in Double Bay, Sydney's highest-spend café strip. Pricing and hours aren't published, so it's best suited to walk-ins and locals rather than planned occasions. Easy to access from the ferry wharf, but for group dining or a confirmed special occasion, there are better-documented options nearby.
Twenty-One Espresso sits on Knox Street in Double Bay, one of Sydney's most well-heeled dining strips. Without published pricing, a website, or a disclosed cuisine format, the honest answer is: you'll need to visit or call ahead before committing to a booking here. What the address tells you is that this is a neighbourhood-facing café or espresso bar operating in a postcode where average spend expectations run higher than most of Sydney. If you're already in Double Bay and want a reliable coffee stop or a low-key solo session, the location alone makes it worth a look. For a planned special occasion, there are more bankable options nearby.
Knox Street in Double Bay draws a consistent crowd of locals, professionals, and weekend visitors — it's a compact, walkable strip where quality coffee and light dining are the default register. Twenty-One Espresso fits that format: an espresso-bar concept in a suburb that treats its café culture seriously. The Double Bay market is competitive, which generally keeps standards at a baseline well above Sydney's inner-west or CBD average for this category. That said, without confirmed seating counts, hours, or a menu overview available, the experience here is harder to pre-plan than at comparable venues. Walk-in appears to be the primary mode of engagement.
No private dining or group booking infrastructure is confirmed for Twenty-One Espresso. For a special occasion dinner or a group celebration requiring a dedicated space, Double Bay has stronger options. Saké Restaurant & Bar Double Bay handles groups with more confirmed capacity and a full dining program. For the wider neighbourhood, check our full Double Bay restaurants guide for venues that publish group and private dining options clearly.
The Knox Street address is walkable from the Double Bay ferry wharf and a short distance from Double Bay station. Booking difficulty is rated easy — this is not a venue where advance planning is required. If you're planning an evening in the area, pair it with a stop from our Double Bay bars guide or consider the broader dining options in our Double Bay experiences guide. For accommodation context, our Double Bay hotels guide covers the neighbourhood's leading stays.
Quick reference: 21 Knox St, Double Bay NSW 2028 , easy booking, walk-in friendly, call ahead for hours and dietary queries.
| Venue | Cuisine | Awards | Booking Difficulty | Value |
|---|---|---|---|---|
| Twenty-One Espresso | Easy | — | ||
| Brae | Modern Australian | World's 50 Best | Unknown | — |
| Attica | Australian Modern | World's 50 Best | Unknown | — |
| Flower Drum | Cantonese | World's 50 Best | Unknown | — |
| Rockpool | Australian Cuisine | World's 50 Best | Unknown | — |
| Saint Peter | Australian Seafood | World's 50 Best | Unknown | — |
Side-by-side comparison to help you decide where to book.
Knox Street has several options within walking distance, so if Twenty-One Espresso has a queue or isn't what you need, you won't have to go far. For a more substantial sit-down meal, the broader Double Bay strip covers everything from casual all-day dining to wine-bar formats. Twenty-One Espresso suits a quick coffee stop rather than a long lunch.
Yes — a Knox Street espresso bar format is about as well-suited to solo visits as it gets. You're not committing to a full meal or a reservation, so timing is flexible. Walk in, order at the counter, and you're done. No awkward table-for-one dynamic here.
No confirmed group booking infrastructure exists at Twenty-One Espresso, and a Knox Street cafe format is not the right setting for a large gathering. For groups of four or more looking for a shared dining experience, look elsewhere on the Double Bay strip where seated restaurant formats are available.
No advance booking is required — and almost certainly not possible given the format. Walk-in is the standard approach at 21 Knox St. Peak times on weekday mornings and weekend brunch hours will be busiest, so factor that in if you're on a tight schedule.
No. With no confirmed private dining, no published tasting menu, and an espresso-bar format, Twenty-One Espresso is not the right choice for a birthday dinner, anniversary, or corporate event. For a special occasion in Double Bay, you need a seated restaurant with bookings — this isn't that.
Counter or bar-style service is the likely format at a Knox Street espresso bar of this type, though the specific seating layout is not confirmed in available venue data. If seated dining is your priority, treat this as a coffee and light-bite stop rather than a sit-down venue.
No menu is published, so specific dietary accommodations can change. Most Sydney espresso bars at this level routinely offer alternative milks for coffee. For complex dietary needs, check the venue's official channels before visiting — the Knox Street address is easy to find if you want to ask in person.
Keep this venue in your Pearl passport, rate it after you visit, and track it alongside every other place you collect.
