Top 6 Modular Expandable Cage Systems in the USA (2025): Expert-Backed Picks to Customize, Expand, and Enrich Small Animal Habitats

The Wabbitat Deluxe earns a best-in-class spot for its balance of modular flexibility, sturdy wire-and-plastic construction, and broad accessory ecosystem that makes building multi-unit indoor rabbit systems straightforward and affordable. Its plug-and-play connectors and widely available replacement parts give it a clear financial advantage over pricier European designs, while offering more expansion-friendly modularity than many traditional hutches. For households needing an economical, scalable cage system tailored to small rabbits, it is often the most practical choice in this lineup.

Kaytee’s My First Home Tank Topper is a cost-effective way to turn an aquarium into a secure guinea pig habitat with excellent visibility and a tight wire mesh top that resists escape and chewing. Compared with full modular cage systems, the tank-topper route is typically the most budget-friendly and visually accessible, though it trades some ventilation and modular-panel expandability for simplicity and clarity of view.

The Habitrail OVO Home stands out as the most customizable, exploration-focused modular system for small pet cages, using transparent tubes and bubble modules that encourage natural curiosity in hamsters and gerbils. Technically optimized for vertical expansion and visual engagement, it is more playful and expandable than entry-level cages, though it can require more maintenance; financially it appeals to owners who want modular add-ons over a single large investment.

The Living World Deluxe Habitat XL is a plastic-based modular habitat that excels for chinchillas and other small pets that benefit from enclosed platforms, quieter operation and easy-to-clean trays, all at a lower purchase price. While it is more portable and often less expensive than metal welded-wire systems like the Ferret Nation or Critter Nation, it is generally less durable and less configurable for heavy-chewing or highly active ferrets, making it a specialist, budget-conscious option for smaller or less destructive animals.

Ferplast's Multipla Modular Cage System is positioned as the market leader for modular engineering and premium materials, offering highly configurable stackable modules and a broad range of accessories for long-term use in hutches and small pet cages. Though typically pricier than Prevue, Kaytee and MidWest options, its technical advantages — sturdier components, European-tested fittings and accessory ecosystem — make it attractive for buyers prioritizing durability and expandability over initial cost.