How Much Space Does a Pig Actually Need?

The honest answer is that pig space requirements come as three different numbers, and they answer different questions: what the law requires, what an industry or welfare scheme asks for, and what a welfare charity advises for a pet pig. They differ by a factor of ten to ninety, so it matters which one you are looking at.

1. The English legal minimum (Schedule 8)

Schedule 8 of the Welfare of Farmed Animals (England) Regulations 2007 sets a minimum unobstructed floor area per pig by average group weight. RSPCA Assured, the higher-welfare certification scheme, asks for more at most weights:

These are per-head shares of a group pen, meant to be multiplied by the number of pigs. Schedule 8 also requires that the pigs can lie down at the same time, so the area has to be usable, not just the right number of square metres. Calculate your own pigs →

2. The US industry figure (National Pork Board)

The US has no federal or state law setting a minimum pen size for pigs. The closest thing to a national reference is the National Pork Board's Swine Care Handbook (2018), used in Pork Quality Assurance Plus certification. Its floor-space table is for indoor growing pigs on partial or total slats, and the figures are ranges for the lighter bands:

It is an industry standard, not a legal requirement, and like the UK figures it is a group allowance. The US calculator applies it.

3. What a welfare charity advises for a pet pig

The RSPCA's advice for people keeping pigs as pets is far more generous than any of the above. Under its housing heading it says: “Your pigs will need somewhere dry to lie down, and a minimum area of 36 square metres (6 x 6 metres) per pig (ideally a larger space).” The page doesn't say whether that counts the dry lying area alone or the total area available to each pig, so we can't tell which. It is written for pet keepers rather than as a farm standard. It is the closest thing we have found to a published “recommended” figure, and for a 50 kg pig it is roughly forty times our 0.9 m² single-pig estimate below, and ninety times the 0.40 m² per-head legal figure.

Why one or two pigs break the group figures

Divide a group allowance down to one or two pigs and you get a pen smaller than the animal. That is why Schedule 8 has a separate rule for individual pens: the internal area must be at least the square of the pig's length, and no internal side may be shorter than 75% of its length. We don't have a published table of pig length by weight, so our calculators estimate it from body size instead. That estimate, which is ours and not a published figure, works out at about:

That is a bare minimum for a pig kept on its own. It is not a recommended pen size, and next to the RSPCA's pet-pig advice it is small. Because of this floor, splitting pigs into several small pens can need more total space than one larger pen holding the same number.

Three kinds of space, not one

“Space per pig” bundles together three needs:

• Lying space. A dry, bedded area where every pig can lie down at once. Defra's guidance also asks that there be a dry lying area the pigs can choose to move to, so they can get away to cooler conditions.
• Standing and moving space. Room to stand, turn and pass each other.
• Separate areas for dunging. The RSPCA describes housing with separate areas for dunging, exploring and sleeping.

Indoor and outdoor are different numbers

Indoor figures cover a resting footprint inside a controlled building. Outdoor systems need land as well: the RSPCA free-range labelling figure is 12 m² per pig where the ground is rotated to fresh ground and 40 m² where it isn't, on top of shelter. Those aren't comparable numbers, and our indoor vs outdoor guide and land guide cover the difference.

Which number should you plan around?

Treat the legal minimum as the floor you must not go below, the RSPCA Assured figure as a reasonable standard for a working system, and the RSPCA's pet-pig advice as what a welfare charity would like to see for animals kept as companions. Plan for the pig's adult weight, and for at least two pigs, since pigs do better with company.

Sources: Schedule 8, Welfare of Farmed Animals (England) Regulations 2007 (via Defra, “Caring for pigs”); RSPCA standards justification (pigs), 2024; National Pork Board, Swine Care Handbook (2018); RSPCA, “Environment for pigs”. Minimum-pen estimates are our own calculation. Sources checked: September 2026.

Source links: Defra (Schedule 8), RSPCA environment for pigs, RSPCA Assured standards justification, National Pork Board Swine Care Handbook.

Common questions

How much space does one pig need?

The published farm figures are per-head shares of a group pen, so they don't work for one pig. Schedule 8 in England says a pen for an individual pig must be at least the square of the pig's length. For a 50 kg pig that comes to roughly 0.9 m², which is a bare minimum. The RSPCA's advice for pet pigs is a minimum area of 36 square metres per pig, ideally more, which is far larger.

Do bigger pig breeds need proportionally more space?

Space standards scale with weight, not breed name. A miniature breed and a standard farm breed at the same weight need about the same space; what differs is the weight they reach as adults, so plan around your pig's expected mature size.

Does the space a pig needs change as it grows?

Yes. The legal minimum in England rises from 0.15 m² per pig under 10 kg to 1.0 m² per pig over 110 kg, so a pig at 20 kg and the same animal at 100 kg have very different requirements. Plan housing for the eventual size.

Is the legal minimum enough?

It is a legal floor, not a target. RSPCA Assured asks for more, and Defra's guidance says more space may be necessary without giving a number. Pigs also need a dry lying area, room to move about and a separate dunging area.