Setting up a rat cage means getting five things right: the cage itself, the flooring, the bedding, the accessories, and the layout. Rats are active, social, curious animals that need more space than most people expect. A pair of rats needs at least three square feet of floor space, and the cage should have enough vertical room on every level for a rat to stand upright without crouching. Here’s how to put it all together.
Choosing the Right Cage
A multi-level wire cage with a solid base is the standard choice for pet rats. Wire walls provide airflow, which is critical for keeping ammonia from building up inside the enclosure. Aquariums and plastic bins might seem convenient, but they trap moisture and gases from urine that damage the lining of a rat’s airways over time.
Bar spacing matters more than most new owners realize. The American Fancy Rat and Mouse Association recommends half-inch spacing between bars. Even adult rats can get their heads stuck in three-quarter-inch gaps, which are common on cages marketed for rabbits or guinea pigs. If you’re housing young rats or small females, half-inch spacing isn’t optional. Look for sturdy wire mesh rather than long, thin bars that a determined rat can bend apart.
For two rats, aim for a cage with at least three square feet of usable floor space across its levels, plus enough height to stack two or three platforms. Rats climb, explore, and build nests at different heights, so vertical space is just as valuable as floor space. A tall cage with multiple levels will keep your rats far more engaged than a wide, shallow one.
Covering Wire Floors and Shelves
Most rat cages come with wire mesh shelves and ramps. Bare wire underfoot is a problem. It puts uneven pressure on the small bones and skin of a rat’s feet, which can lead to a painful condition called bumblefoot: open sores on the foot pads that become infected with bacteria. Flat, solid surfaces distribute weight more evenly and cause far less abrasion.
You can cover wire platforms with a variety of materials: thin plywood, vinyl tiles, plastic needlepoint canvas, Plexiglass, fleece blankets, or even towels. Each option has tradeoffs. Hard surfaces like wood or plastic are easy to wipe down but need to be replaced once they absorb urine. Fabric covers like fleece are comfortable but require washing every few days. Whichever you choose, make sure every wire surface your rats walk on is covered before they move in.
Picking Safe Bedding
The base of the cage needs an absorbent substrate to soak up urine and control odor. Paper-based bedding is the most widely recommended option. It’s dust-free, absorbent, and doesn’t contain volatile compounds that could irritate a rat’s lungs.
Cedar and pine shavings have long been flagged as potentially harmful because wood dust exposure is linked to airway damage in humans. While one controlled study in mice found no significant health differences after four months on cedar or pine versus paper bedding, most rat owners and veterinarians still recommend erring on the side of caution and sticking with paper-based or kiln-dried pine products. Cedar, in particular, has a strong aromatic smell that signals high levels of natural oils. If you want wood-based bedding, look for kiln-dried options, which have had most of those compounds removed through heat processing.
Spread the bedding two to three inches deep in the base tray. Rats like to dig and burrow, so a generous layer gives them something to work with.
Water and Food Setup
A drip bottle attached to the outside of the cage is the cleanest way to provide water. Bowls get contaminated fast. Rats will walk through them, drop food in them, and sometimes use them as a toilet. A bottle keeps the water supply clean for a day or two between refills, while a bowl typically needs changing multiple times a day.
The one downside of bottles is that the narrow tube and ball valve can harbor bacteria if you don’t scrub them regularly. Use a small bottle brush to clean the tube every time you refill it. Some owners keep a bowl as a backup in case the bottle’s ball valve sticks or a rat has trouble using it, but for most rats, a bottle alone works well.
For food, a heavy ceramic dish works better than a lightweight plastic one because rats will flip anything they can. Place it on a lower level where bedding is less likely to get kicked into it. Rats are natural foragers, though, so scattering some of their daily food across the cage rather than piling it all in the dish gives them something to do.
Essential Accessories
A bare cage with food and water isn’t enough. Rats are intelligent animals that need places to hide, things to chew, and spaces to climb and rest. Think of the accessories in three categories.
- Hides: As prey animals, rats feel stressed without enclosed spaces to retreat to. Every rat in the cage should have access to at least one hiding spot, ideally a dark, enclosed space where they can nest and sleep away from light. Wooden huts, cardboard boxes, coconut shells, or fabric pouches all work. Place hides on different levels so your rats can choose where they feel safest.
- Hammocks: Fleece hammocks that clip to the cage walls are a rat favorite. Most rats prefer sleeping in a hammock over sleeping on the cage floor. They’re inexpensive, easy to wash, and give your rats a cozy elevated resting spot. Keep a few in rotation so you always have a clean one ready.
- Chew toys: Rat teeth never stop growing. Without appropriate things to gnaw on, their teeth can overgrow and cause serious health problems. Wooden chews, woven grass toys, hanging chew sticks, and cardboard tubes all satisfy this need. Rotate them out every week or two to keep things interesting.
Beyond these essentials, add ropes, ladders, tunnels, and platforms to create a complex environment. The RSPCA recommends including a mix of horizontal and vertical barriers, along with varied materials like wood, cloth, and paper, to encourage exploration and exercise. Rats are nocturnal burrowers in the wild but also excellent climbers, so a good cage setup gives them opportunities to do both.
Cage Placement
Where you put the cage in your home affects your rats’ health and comfort. Rats do best in temperatures between 68°F and 79°F, with humidity between 30% and 70%. Avoid placing the cage in direct sunlight, next to a radiator, or in a drafty spot near an exterior door or window. Temperature swings and low humidity can trigger respiratory flare-ups, which rats are already prone to.
Rats are social and generally enjoy being in a room where the household spends time, but they also need uninterrupted sleep during the day. A living room or home office usually strikes the right balance. Keep the cage off the floor to reduce drafts and give your rats a better vantage point, which helps them feel secure.
Cleaning Schedule
Ammonia from urine is the single biggest environmental threat to a rat’s respiratory health. Research has shown that ammonia levels commonly found in poorly maintained cages cause measurable damage to the tissue lining a rat’s airways. A consistent cleaning routine is the best prevention.
Spot-clean the cage daily: remove soiled bedding clumps, uneaten fresh food, and any waste in corners your rats favor as a bathroom. Replace all the bedding and wipe down surfaces once or twice a week, depending on how many rats you have and how quickly odor builds.
For deeper cleaning, plain dish soap and warm water handle most jobs. White vinegar (a mild disinfectant) works well for cutting urine residue and neutralizing odor. Stabilized chlorine dioxide products are effective against bacteria, viruses, and fungi if you want a stronger option. Avoid Lysol and other phenol-based cleaners, which are toxic to rats. Skip anything heavily perfumed, too. If you can smell the cleaner after rinsing, your rat’s far more sensitive nose will be overwhelmed by it. Rinse all surfaces thoroughly and let them dry before adding fresh bedding and returning your rats to the cage.