Modular cat enclosures give cats more room to climb, lounge, and explore while helping you control safety indoors or outdoors. They’re a smart option for multi-cat homes, active kittens, and owners who want a flexible setup.
Below, we’ve focused on space, stability, weather resistance, and ease of assembly so you can quickly find the right enclosure for your home and your cat’s needs.
Best 10 Modular Cat Enclosures Picks for 2026
Mobile Indoor/Outdoor Catio
Aivituvin 3-Tier Cat House on Wheels
- 4 wheels with 2 locking casters
- 3-tier layout with hammocks and platforms
- Can connect two units for more space
Best For: Owners wanting a movable catio for indoor or outdoor use
DIY Wire Grid Enclosure
- Tool-free setup in about 30 minutes
- Multi-level shelves for climbing and lounging
- Folds flat for compact storage
Best For: Apartment owners needing a customizable indoor playpen
Weatherproof Outdoor Catio
Rywell Extra Large 3-Tier Enclosure
- 3-tier design with hammock and hideaway cube
- Reinforced PVC frame with mesh ventilation
- Removable roof and waterproof floor
Best For: Cats needing a portable outdoor enclosure for patio or travel
Indoor Cage With Litter Box
Oneluck 4-Tier DIY Cat Enclosure
- Separate litter box area reduces mess
- Drawer-style cleaning for easier maintenance
- Assembles in about 10 minutes
Best For: Indoor cat owners who want simpler litter-box cleanup
3-in-1 Portable Catio
Modular Playhouse for Multi-Cat Families
- 3-in-1 setup with tower tent, tunnel, and playpen
- Extra-large space for multiple cats or small pets
- Foldable, portable, and easy to store
Best For: Multi-cat homes needing a roomy portable play enclosure
Drawer-Litter Cat Cage
Indoor Metal Enclosure with 4 Levels
- Partitioned litter area helps contain mess
- Drawer-style cleaning makes maintenance easier
- Four-tier layout offers climbing and resting space
Best For: One to two indoor cats with a litter-management priority
Weatherproof 3-Level Catio
- 50-inch height adds vertical climbing space
- Three levels with padded perches for lounging
- Weather-resistant mesh supports outdoor use
Best For: Cat owners wanting a tall, weather-resistant outdoor catio
Tall 4-Tier Indoor Catio
Tangkula 56" Skylight Enclosure
- 4-tier modular layout for rest, play, and feeding zones
- Lockable skylight, 4 doors, 3 ladders, and hammock included
- Anti-tip kit and wire/PP build support daily indoor use
Best For: Homes with 1-4 cats needing a tall, flexible enclosure
Customizable Large Cat Cage
- Modular panels support DIY layout changes
- 3 front doors plus side skylight improve access
- Smooth platforms and cable ties add safety and stability
Best For: Cat owners who want a roomy, customizable indoor cage
Compact One-Cat Catio
- Compact 35.4-inch size suits smaller rooms
- 2 doors and top skylight make access easier
- 150 zip ties and E-coat finish support stability
Best For: Single-cat homes needing a compact indoor catio
Mobile Indoor/Outdoor Catio – Aivituvin 3-Tier Cat House on Wheels
If you want modular cat enclosures that can move with your routine, this Aivituvin cat house is built around flexibility. The 4 caster wheels make repositioning easy, while the waterproof asphalt roof and indoor/outdoor window-catio setup give you multiple ways to use it.
Best For: Cat owners who want a movable, multi-level enclosure for indoor or outdoor use.
Pros:
- 4 wheels with 2 brake casters for easier moving and secure placement
- 3-tier layout with platforms, removable hammocks, sisal blankets, and a resting house
- Waterproof roof and removable PVC bottom layer for outdoor use and easier cleaning
- Can be combined with a second unit for a larger activity space
Cons:
- Assembly may be more involved if you plan to connect two units
- Wood construction is heavier and less portable than wire or fabric alternatives
- Best suited to cats rather than very large pets
This is a strong pick if you want a sturdier catio that still offers modular flexibility. The wheel base, tiered design, and combine-two-units option make it one of the more adaptable choices here.
DIY Wire Grid Enclosure – Foldable Black Metal Cat Cage
This DIY modular cat enclosure is a good fit when you need a compact, customizable indoor setup. The wire grid layout creates multiple levels for climbing and lounging, and the fold-flat design makes it practical for apartments or temporary use.
Best For: Apartment cat owners who want a customizable indoor playpen with multi-level shelves.
Pros:
- Tool-free assembly in about 30 minutes with illustrated instructions
- Multiple levels and shelves for litter-box space, lounging, and play
- Powder-coated black steel frame with 1-inch spacing for ventilation and safety
- Folds flat for easier storage and portability
Cons:
- As an indoor-only design, it is not built for outdoor weather exposure
- Best suited to one cat rather than multiple large cats
- Compact footprint limits overall floor space compared with larger catios
For a small-space indoor setup, this enclosure offers useful modularity without much hassle. It emphasizes vertical space, simple assembly, and convenient storage over sheer size.
Weatherproof Outdoor Catio – Rywell Extra Large 3-Tier Enclosure
Among modular cat enclosures for outdoor use, this Rywell catio stands out for its weather-ready frame and expandable design. It gives cats a three-tier play area with a hammock and hideaway cube, while the removable roof and waterproof floor help it handle patio or balcony use.
Best For: Indoor cats that need a portable outdoor enclosure for patios, balconies, or travel.
Pros:
- 3-tier layout with room for litter box, bed, toys, and bowls
- Reinforced PVC frame and high-density mesh for stability and airflow
- Removable Oxford roof and waterproof floor for outdoor protection
- Tunnel port lets you connect compatible cat tunnels for expansion
Cons:
- Assembly depends on fully seated connectors for stability
- Fabric-based structure is less rigid than wood or metal cages
- Expandable tunnel compatibility requires separate purchases
This is a flexible choice if you want a lightweight outdoor catio that can be disassembled for storage or travel. The combination of shelter features and modular expansion makes it useful for seasonal or portable use.
Indoor Cage With Litter Box – Oneluck 4-Tier DIY Cat Enclosure
If your priority is a tidy indoor setup, this Oneluck cat cage focuses on practical litter management inside a modular cat enclosure. The separate litter box area and drawer-style cleaning design make it easier to maintain without opening the whole unit.
Best For: Owners who want an indoor cat enclosure with easier litter-box cleanup.
Pros:
- Independent litter box area helps keep litter from spilling through the cage
- Drawer design makes litter maintenance easier without opening the door
- Safe platform bulkhead is designed to avoid hurting paws
- Tool-free assembly for one person in about 10 minutes
Cons:
- Single-door design may be less convenient than cages with multiple access points
- Indoor use only, so it is not intended for outdoor placement
- Narrower footprint limits floor space compared with larger enclosures
This model is best viewed as a practical indoor containment solution rather than a roomy catio. Its biggest advantage is the easier litter-box workflow, especially for one to two cats.
3-in-1 Portable Catio – Modular Playhouse for Multi-Cat Families
If you want modular cat enclosures that feel more like a play space than a basic pen, this 3-in-1 design is easy to like. It combines a tower tent, tunnel, and trapezoid playpen into one flexible setup, giving cats multiple ways to climb, explore, and lounge indoors or outside.
Best For: Multi-cat homes, kittens, and small pets that need a roomy, portable enclosure for patio, balcony, camping, or travel use.
Pros:
- 3-in-1 modular layout with a tower tent, extended tunnel, and playpen
- Extra-large interior is sized for multiple cats or small pets
- Foldable build and carry bag make setup, storage, and travel simple
- Water-resistant cover and breathable mesh help with sun, light rain, and airflow
Cons:
- Soft-sided design is better for supervised use than permanent outdoor housing
- Large footprint may be harder to place in small indoor spaces
This is a strong pick if you want a flexible enclosure that can change with your space and routine. The modular layout adds enrichment, while the lightweight construction keeps it practical for everyday use and short trips.
Drawer-Litter Cat Cage – Indoor Metal Enclosure with 4 Levels
Among modular cat enclosures, this metal cage stands out for owners who want better litter control in a compact indoor setup. Its 4-tier layout includes a partitioned litter box area and a drawer-style cleaning design, so it focuses more on practical daily maintenance than open-ended play.
Best For: One to two indoor cats whose owners want a tall, detachable enclosure with an integrated litter area and easy cleanup.
Pros:
- Built-in litter box section helps contain mess and reduce scatter
- Drawer design makes litter cleaning faster and easier
- 4 levels provide room for hanging out, resting, and climbing
- Tool-free assembly and disassembly support storage or transport
Cons:
- Narrower footprint may feel tight for larger cats or active pairs
- Metal wire style is less open and natural than outdoor catio designs
This is a smart choice if cleanup convenience matters most. It is less about outdoor enrichment and more about creating an organized indoor cat zone that keeps litter management contained.
Weatherproof 3-Level Catio – Tall Outdoor Cat Enclosure
This tall outdoor option is a practical fit if you are comparing modular cat enclosures for patio, balcony, or backyard use. At 50 inches high, it gives cats more vertical room to climb and perch, while the weather-resistant mesh frame is built for visibility, airflow, and everyday outdoor protection.
Best For: Indoor-outdoor cat owners who want a spacious, weather-resistant enclosure with multi-level perches and tool-free setup.
Pros:
- 50-inch height provides more vertical climbing and jumping space
- Three levels and padded perches support lounging and observation
- Weather-resistant mesh and sturdy frame are made for outdoor conditions
- Tool-free assembly and foldable design make it easy to move or store
Cons:
- Primarily suited to supervised outdoor or indoor-outdoor use
- Heavier than soft portable playpens at 19 pounds
If you want a taller catio-style setup with more enrichment than a basic pen, this model delivers a balanced mix of space and protection. The platform layout is especially useful for cats that like to climb, nap high, and watch the world outside.
Tall 4-Tier Indoor Catio – Tangkula 56" Skylight Enclosure
If you want modular cat enclosures that make the most of vertical space, this Tangkula 4-tier setup is built for climbing, resting, and daily routines in one indoor footprint. The detachable metal wire design, skylight, and multiple access points make it easier to create a custom layout for 1-4 cats while still keeping the enclosure practical for feeding and cleaning.
Best For: Multi-cat households that need a tall, flexible indoor enclosure with strong access and climbing features.
Pros:
- 4-tier layout creates separate rest, play, and feeding/toilet zones.
- Detachable modular panels support flexible assembly and room-specific setups.
- Lockable skylight, 4 lockable doors, 3 ladders, and a hammock add convenience and comfort.
- Metal wire and PP construction includes an anti-tip kit for added stability.
Cons:
- Assembly requires careful connector tightening and use of the included zip ties and hammer.
- The tall vertical design may be more enclosure than needed for a single cat.
This is a strong pick if your priority is a spacious, climb-friendly cat enclosure that can be adapted to different needs and layouts. It leans more toward a structured indoor catio than a simple crate, which is ideal for active cats.
Customizable Large Cat Cage – Oneluck 55" 4-Tier Cage
For shoppers comparing modular cat enclosures, this Oneluck model stands out for its flexible panel design and roomy 41 x 41 x 55 inch footprint. It is aimed at 1-3 cats and adds practical access points, making it a useful choice when you want a DIY indoor cat enclosure that can be arranged around your space and routine.
Best For: Owners who want a spacious, customizable cat cage with easy day-to-day access.
Pros:
- Flexible modular panels let you DIY the enclosure layout to fit your home.
- Three front doors and a side skylight make feeding, cleaning, and interaction easier.
- Upgraded smooth platforms are designed to protect paws while climbing and jumping.
- Secure connectors and cable ties add stability for long-term daily use.
Cons:
- Listed as a 2-level design in the details despite the 4-tier description, so buyers should review the layout carefully.
- May be larger than necessary for owners with only one cat and limited space.
Overall, this is a practical option if you want an adaptable enclosure with straightforward access and a roomy interior. It focuses on customization and everyday convenience more than extra add-ons.
Compact One-Cat Catio – Oneluck 35.4" 3-Tier Playpen
If you need modular cat enclosures for a single cat in a smaller footprint, this Oneluck 3-tier playpen is sized for everyday indoor use without taking over the room. The detachable wire design, top skylight, and two doors make it a practical pick for feeding, cleaning, and quick interactions, while the sub-area layout helps organize supplies and rest space.
Best For: One-cat homes that want a compact, easy-to-assemble indoor enclosure.
Pros:
- Compact 35.4-inch footprint fits smaller spaces better than larger cat cages.
- 2 doors and a top skylight simplify access for care and interaction.
- 150 zip ties and a rust-preventive E-coat finish help support stability and durability.
- Oversized two-level platform and sub-area design create organized spaces for pet items.
Cons:
- Designed primarily for 1 cat, so it may be too small for multi-cat households.
- Less vertical capacity than taller 4-tier options if you want more climbing room.
This enclosure makes sense when you want a simpler setup with manageable assembly and enough room for one cat to play and rest. It is a sensible space-saving choice rather than a large statement piece.
How We Picked These Modular Cat Enclosures
We looked for models that balance usable space, sturdiness, and practical features like removable shelves, lockable doors, litter-box access, and foldable or portable frames. For outdoor picks, weather protection and roof coverage matter just as much as size. For indoor picks, modular layouts and easy cleaning are the biggest advantages.
Quick Comparison
If you want a simple way to narrow the field, think in three groups: outdoor catios for weather exposure, indoor modular cages for controlled enrichment, and hybrid styles that can move between spaces. Larger multi-tier designs are better for energetic cats or two to three cats, while smaller modular units fit apartments or temporary setups.
Key Buying Factors for Modular Cat Enclosures
Size and Vertical Space
Floor area is important, but height often makes a bigger difference for cats. Look for multiple levels, ramps, hammocks, or shelves if your cat likes to climb.
Materials and Durability
Metal wire frames usually offer the best structure for indoor Modular Cat Enclosures, while outdoor models should include weather-resistant coatings, waterproof roofs, or mesh designed for year-round use.
Access and Cleaning
Check how easy it is to open doors, remove trays, and reach corners. A good enclosure should simplify feeding, litter maintenance, and daily cleanup.
Mobility and Setup
Some modular units are foldable or on wheels, which helps if you need to reposition the enclosure or store it between uses. Others are built for a more permanent outdoor placement.
Who Should Buy Which Modular Cat Enclosures?
Choose an outdoor catio if your cat needs supervised fresh air and sun exposure. Pick an indoor modular cage or playpen if you need a safe exercise area, recovery space, or temporary containment. Multi-level designs are best for households with more than one cat, while simpler setups work well for smaller spaces or occasional use.
In short, the best Modular Cat Enclosures are the ones that match your space, climate, and cat’s activity level. Prioritize safety first, then choose the layout and features that will be easiest for you to maintain every day.