Collection: Castle Expansion MOC Building Sets | Compatible with LEGO
Expand your LEGO Castle with custom Castle Expansion MOC sets. Build walls, towers, bridges & gates using LEGO-compatible bricks. Perfect for medieval MOC builders, collectors, and fantasy diorama creators.
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Wizard's Tower Building Set | MOC-117200
Regular price $39.95 USDRegular priceUnit price / per -
Guardians Grand Tower Building Set | MOC-141500
Regular price $59.95 USDRegular priceUnit price / per -
Knight's Castle Building Set | 10305 Modular Expansion | MOC-144534
Regular price $523.95 USDRegular priceUnit price / per -
Falcon's Stable Building Set | MOC-141494
Regular price $72.95 USDRegular priceUnit price / per -
Lion Knights' Tournament: Big Grandstand | MOC-132506
Regular price $44.95 USDRegular priceUnit price / per -
Lion Kinghts Castle Bridge Expansion | MOC-139136
Regular price $46.95 USDRegular priceUnit price / per -
Wolfpack Watchtower Building Set | Castle Modular Moc | MOC-154058
Regular price $18.95 USDRegular priceUnit price / per -
Donjon Building Set | Extension for 10305 | MOC-130733
Regular price $124.95 USDRegular priceUnit price / per -
H08 Owl Tower Building Set | Modular Medieval Castle | MOC-131234
Regular price $103.95 USDRegular priceUnit price / per -
Medieval Merchant's Bridge Building Set | Expansion for Set 10305 | MOC-192417
Regular price $69.95 USDRegular priceUnit price / per -
Modular Castle's Keep Building Set | Lion Knights | MOC-92106
Regular price $74.95 USDRegular priceUnit price / per -
Outpost Castle Building Set | MOC-150774
Regular price $57.95 USDRegular priceUnit price / per -
Medieval Market Stall Building Set | 106 pcs | MOC-105220
Regular price $9.95 USDRegular priceUnit price / per -
Medieval Bridge Building Set | 317 pcs | MOC-74371
Regular price $16.95 USDRegular priceUnit price / per -
Orc Archery Tower Building Set | 1195 pcs | MOC-196549
Regular price $68.95 USDRegular priceUnit price / per -
Black falcon Siege Tower Building Set | GoBricks | MOC-191624
Regular price $44.95 USDRegular priceUnit price / per -
Medieval Tournament Grounds Building Set | MOC-152408
Regular price $231.95 USDRegular priceUnit price / per -
Medieval/Castle WindMill MOC Building Set | MOC-117560
Regular price $22.95 USDRegular priceUnit price / per -
Lion Knights' Bridge Building Set | MOC-161587
Regular price $44.95 USDRegular priceUnit price / per -
Medieval Black Falcon Outpost Building Set | MOC-85157
Regular price $103.95 USDRegular priceUnit price / per -
Modular Watchtower Building Set | MOC-80769
Regular price $29.95 USDRegular priceUnit price / per -
Modular Archery Range Building Set | MOC-82064
Regular price $29.95 USDRegular priceUnit price / per
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Upgrade Your LEGO Castle with Custom Expansion MOC Sets
Take your medieval builds to the next level with our Castle Expansion MOC Building Sets, expertly designed to be fully compatible with LEGO bricks. Whether you're expanding an existing LEGO castle or building an entire fortress from scratch, these MOC kits offer detailed wall sections, gates, towers, bridges, and more.
Seamless Compatibility with LEGO Bricks
Every Castle Expansion MOC set is built using LEGO-compatible pieces, allowing easy integration with official LEGO Castle sets. Whether you're building a sprawling kingdom or enhancing a small outpost, these expansion sets provide the flexibility to connect, stack, and customize with total freedom—perfect for collectors and builders alike.
Expand Walls, Gates & Defensive Towers
Reinforce your LEGO medieval kingdom with advanced defensive structures including modular walls, archer towers, moats, and fortified gates. These sets let you scale up your castle layout while maintaining authentic medieval design. Build higher, wider, and more secure—ideal for battle scenes or castle displays.
Highly Detailed Architectural Designs
Our MOC creators focus on realism and intricate detail—replicating stone textures, medieval timberwork, and classic European castle elements. From weathered stone walls to functional drawbridges, each set adds historical accuracy and unique design touches not found in official LEGO sets.
Easy-to-Follow Digital Building Guides
Each set includes professionally designed PDF instructions for smooth building. Builders of all experience levels can enjoy these kits, whether you're a seasoned AFOL (Adult Fan of LEGO) or introducing younger fans to custom medieval builds. Step-by-step visuals make construction both fun and rewarding.
Perfect for Dioramas, Stop-Motion & Roleplay
These expansion sets aren't just for static displays—they're ideal for dynamic storytelling. Use them to create medieval dioramas, stop-motion scenes, or as backdrops for fantasy tabletop games like D&D. Their modularity allows you to rebuild and reimagine your castle over and over again.