Guinea Pig Housing Guide: Cage Size, Setup and Companionship

Guinea pigs need far more floor space than most starter cages allow. For a pair, aim for at least 0.7 square metres (around 120cm x 60cm) of continuous floor, kept indoors or in a well-insulated, predator-proof hutch outside. They are herd animals, so plan for two from the start rather than one.

Most of the trouble new owners run into traces back to housing that was sold as "guinea pig sized" but is really only big enough for a sleep area. Below is what actually works in a UK home or garden, and how to put it together without buying twice.

How big should a guinea pig cage be?

Forget the small pet-shop boxes. Guinea pigs are ground-dwellers who pace and "popcorn" when happy, and they need room to do laps.

• One or two pigs: a minimum of 120cm x 60cm of usable floor. Bigger is genuinely better here.
• Three or four pigs: step up to roughly 150cm x 60cm or more.
• Single level only: unlike rats, guinea pigs are poor climbers. Tall multi-storey cages waste money because the upper levels barely get used. Spend your budget on footprint, not height.

Avoid cages with wire or mesh floors. Those cause sore, infected feet (a painful condition called bumblefoot). You want a solid, flat base you can line and clean.

C&C grids (the cube-and-coroplast modular setups) are popular in the UK for a reason: cheap, expandable, and you can build exactly the floor area you need. A converted hutch works too, as long as you measure the internal floor rather than trusting the box description.

If you are weighing up an outdoor build, the same frame logic that applies to rabbit hutches applies here, with one big caveat covered below: guinea pigs feel the cold far more than rabbits.

Indoor vs outdoor housing in the UK

Both can work, but the climate makes the decision for you for much of the year.

Indoors is the safest default. Steady room temperature, no foxes, and you see your pigs every day so health problems get caught early. Keep them out of direct draughts and away from radiators, and somewhere they hear gentle household activity rather than total silence or constant blaring TV.

Outdoors is fine in mild weather but demands proper kit. The comfortable range for guinea pigs is roughly 15 to 24C. Below about 15C they start to struggle, and a frosty British night can be dangerous. If you keep them outside:

• Choose a hutch with thick timber, a sloped felted roof and a sheltered sleeping compartment.
• Raise it off the ground on legs.
• Add an insulated hide, plenty of extra hay to burrow into, and a snug cover on cold nights.
• Through winter, most UK keepers move pigs into a shed, garage (never one used for cars) or utility room.

For a deeper seasonal walkthrough, our guide on winter care for outdoor rabbits carries across well, just remember to set your temperature threshold higher for guinea pigs.

Companionship: why one is never enough

Guinea pigs are intensely social. A lone pig, however much you handle it, tends to become withdrawn, eats less and shows more stress. UK welfare guidance is clear that they should live in pairs or small groups.

Good combinations:

• Two females (sows): usually the easiest pairing.
• A neutered male with one or more females: sociable and stable once he is neutered.
• Two males (boars): can work, especially littermates, but give them more space and two of everything to head off squabbles.

Never house guinea pigs with rabbits. A rabbit can injure a pig with a single kick, they need different diets, and rabbits can carry bacteria harmless to them but serious for pigs.

Always introduce new pigs on neutral ground after a quarantine period, and have a backup plan in case a pairing does not settle.

Bedding, hides and the daily setup

Inside the cage, the layout matters as much as the size.

• Base layer: a solid floor lined with dust-extracted paper bedding, soft fleece liners over absorbent towels, or paper-based litter. Skip sawdust and softwood shavings, which can irritate the airways.
• Hides: at least one hide per pig plus one spare, so a nervous pig always has somewhere to bolt to. Tunnels work brilliantly because they double as a sense of safety and a play feature.
• Hay: the single most important item, and it should be available at all times. Hay drives healthy digestion and wears down ever-growing teeth. Our rabbit and guinea pig diet basics guide explains why hay comes first, ahead of pellets and veg.
• Water: a bottle and a heavy ceramic bowl, checked daily. In winter, watch for the bottle nozzle freezing.

For cleaning, spot-clean soiled corners daily and do a full strip-down weekly. A gentle dry-cleaning foam is handy for tidying a grubby pig between rare, only-if-truly-needed baths, since guinea pigs dislike water and chill easily once wet.

Run time, exercise and enrichment

A big cage is the baseline, not the whole story. Guinea pigs need daily time to stretch out and forage.

Attach or set up a secure run so they can graze and explore safely. The same enclosed, fox-proof thinking behind good rabbit runs applies: solid mesh, a roof or weighted edges, and shade. On the lawn, check there are no treated areas or toxic plants within reach.

Inside the run and cage, rotate enrichment so boredom never sets in. Forage scattered in hay, cardboard tunnels, willow chews and food puzzles all keep busy minds occupied. A slow-feed puzzle turns mealtime into a foraging game, which suits a species hardwired to nibble all day. For more ideas, see beating small-pet boredom, and browse the wider range of rabbit toys since many crossover well for pigs.

If you are kitting out a sheltered outdoor spot, a weatherproof shelter such as a waterproof feral cat house can serve as an insulated extra hide on a covered patio, giving timid pigs a draught-free retreat.

Putting it all together

A worried squeak, a pig that hides constantly, or sudden weight loss are signs worth acting on quickly. Guinea pigs hide illness well, so if eating or behaviour changes for more than a day, book a vet who sees small pets rather than waiting to see if it passes.

Get the basics right, generous floor space, a companion, constant hay, daily run time and a warm dry setup, and guinea pigs are wonderfully rewarding, chatty little pets. Start with the right cage size and you will rarely need to upgrade. Browse our full range of small pets housing and accessories, or explore the wider small pets hub for more care guidance.