Groups

Birthday

Make a Wish, Live the Magic

Celebrate You: A Milestone Birthday Oozing with Style

Imagine whisking away with your favorite people to a secluded, almost hidden place that feels both extraordinary and completely your own — a storied palace surrounded by parkland, old trees, and open countryside. Here at The Palace at Osowa Sien, birthdays unfold differently than just about anywhere else. There’s no rush, no outside guests — you have the palace and grounds entirely to yourselves; every nook and cranny.

The base of every stay is self-catered, giving you full freedom to do things your way. Cook together, have the run of the joint, and celebrate in the ballroom or anywhere else you please — as late and as loud as you want. There’s no curfew, no shared spaces, and no one else here but you.

For some, it’s a string of evenings that stretch into each morning — sleep it off, then do it all again. Music sets led by friends, shared cooking sessions in the kitchen, disco lights spilling through the halls, and the pure joy of doing absolutely nothing in between (except maybe hitting the sauna, if you feel like it).

For others, it’s a milestone birthday marked in style — long tables dressed in floor-length linens, our signature hyper-seasonal farm-to-table cooking, and the unmistakable atmosphere we’re known for: hundreds of glowing candles, the low hum of old American and French jazz, and glasses of local craft bevvies raised to a life well lived — ending, as it often does here, with a late-night chat in the kitchen or fireside. Because you can.

Venue Highlights

Getting Here Is Easy

Just over an hour from Poznań (POZ) or about the same from Wrocław (WRO) — and only a few hours from Berlin (BER) — getting to the palace is simpler than you’d think.

Private transfers, local taxis, or mini charters for groups of 12 to 40 can bring you straight to the gates. Once you arrive, there’s really no need to go anywhere — everything you need is right here.

If you like, we can even have local farmers and artisans stock the castle kitchen pantry before you arrive — think fresh bread, cheeses, seasonal produce, and bottles from nearby vineyards.

 

Your Birthday, Your Experience

Turn your birthday into a multi-day celebration at The Palace at Osowa Sien, where you’ll toast with friends in your own castle, dance under a glistening mirror ball, and unwind in a space that feels like home—but better.

Services & Experiences

Cooking & Catering

Craft a birthday celebration tailored to you. Prepare meals together with our Stock-the-Pantry service featuring local, seasonal ingredients, or bring in your own chef. Prefer full-service dining? Choose catering, beverages, and decor from trusted local vendors. For something extraordinary, indulge in farm-to-table cooking or add a unique twist with fun options like a mobile sushi bar or pizza truck.

Birthday Cake:

Sweeten your celebration with a custom birthday cake, croquembouche tower, cupcake pyramid, or more—all crafted by a local baker to bring your vision to life. Vegan? Gluten-free? We’ll connect you with the perfect pastry chef.

Comprehensive Services:

Elevate your celebration with bespoke services like floral arrangements, event planning, wine tastings, and more. Prefer to self-cater or bring in your own vendors? You’re welcome to do so. For added ease, hire a local maid service to tidy common areas each morning while you recharge for another fun-filled day.

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Wellness

Between all the revelrie and late nights, there’s room to slow down too. Warm up in the Finnish sauna, stretch in the garden, or book a group massage. Some birthdays call for champagne at sunrise — others, for naps and bathrobes till noon.

A birthday like no other

At The Palace at Osowa Sien, your birthday is more than a party—it’s a reflection of you.

Enjoy a cozy dinner in the castle, toast under the stars, or gather around a bonfire with champagne in hand. Every detail is designed to feel personal and meaningful, set against the backdrop of your own private castle.

Our Offer

Plan Your Celebration

Exclusive-use castle stays designed for comfort, connection, and—quite frankly—the party of a lifetime.

Every stay includes:

  • Private use of the castle and 5-hectare estate — no other guests, ever.
  • Accommodation for up to 46 guests (40 beds) across 12 unique rooms and suites.
  • Essentials provided: Wi-Fi, linens, towels, utilities, and parking.
  • Flexible dining options: self-catered stays, stocked pantries, or full-service catering.
  • Wellness add-ons: sauna, massages and more.

Whether you’re planning your own birthday weekend or organizing something special for a parent, friend, or partner, The Palace at Osowa Sien gives you the time, space, and atmosphere to make it unforgettable.

It’s not just a venue.
It’s your private exclusive home for the stay.

Ready to start planning your birthday extravaganza?

Send us a note at hello@castlerental.com with your preferred dates, guest count, and whether you’d like to self-cater, have the pantry stocked, or go all in on our farm-to-table experiences.

 

"I celebrated my 30th birthday at the Palace and couldn't have asked for a more amazing venue. Jamie has been the most incredible person to communicate with - so reliable and helpful for EVERYTHING."

— Sebastian L, Birthday Boy, April 2023

See hundreds of our other 5-star reviews on Google, here.