Outdoor cat houses that cats actually use

An outdoor cat house has one job — keep a cat dry, out of the wind and above the cold ground. Warmth is not supplied by the box. It is supplied by the cat, and the box's only role is to stop that heat escaping.

That single fact drives every recommendation below, including the one that surprises people most: a bigger shelter is a colder shelter.

Size: smaller is warmer

Choose an outdoor cat house that fits the number of cats without leaving much empty space, because oversized shelters lose warmth faster. A cat curled in a snug box raises the interior air temperature noticeably within an hour. The same cat in a shelter twice the volume is heating air it will never touch.

For a colony, two medium shelters beat one large one. They hold heat better, they let a bullied cat sleep apart, and if one floods you have not lost the only shelter.

Keep the entry hole small. A 14–15 cm opening admits a cat and excludes a fox, a badger and most of the wind. It also keeps the heat in, which a full-sized cat flap does not.

Insulation: what actually works

Weatherproof shelters are usually built from durable, waterproof materials — moulded plastic, treated wood, or plastic over a foam core. The material of the outer shell matters far less than whether there is an insulating layer inside it.

• Extruded polystyrene (XPS) board is the workhorse. Around 25 mm lining the floor, walls and roof gives a large improvement for a few pounds. It does not absorb water, unlike the crumbly white EPS beadboard.
• Foil-faced insulation reflects radiant body heat back inward. Effective, and often paired with a wadding layer in commercial shelters.
• Double-wall moulded plastic with an air gap or injected foam, as used in dog-kennel style shelters, is the low-effort option and needs no maintenance.
• Untreated single-skin wood is the common disappointment. It looks the part in photos, soaks up rain, and insulates poorly unless lined.

Cover any exposed polystyrene with a hard liner or tape. Left bare, cats and rodents chew it, and the fragments end up eaten.

Raised floors and drainage

Ground is the biggest heat sink a shelter touches. Sitting a box directly on soil, paving or decking wicks damp upward and pulls warmth out of the floor all night.

• Raise the shelter 10–15 cm on bricks, blocks or timber feet.
• Position it on the highest available spot, not in a dip where water gathers.
• Drill two small drainage holes in the floor corners in case rain blows in.
• Angle the whole shelter with a 2–3 degree tilt away from the entrance so anything that enters runs back out.

Bedding: straw, never blankets

This is the most common mistake and the easiest to fix. Blankets, towels, cushions and old jumpers absorb moisture from rain, snow and the cat's own breath. Wet fabric conducts heat away from the animal, and below freezing it turns into a cold slab.

Loose straw is the correct answer. It is hollow-stemmed, so it traps air; it repels moisture rather than soaking it; and cats burrow into it, which creates a shaped pocket around the body. Fill the shelter about two thirds deep and let the cat form its own nest.

• Straw — yes. Golden, dry, dust-free. Replace when it flattens or smells, usually every few months.
• Hay — no. It is animal feed, holds moisture, moulds quickly and can trigger respiratory problems.
• Shredded newspaper — an emergency stopgap only. It compacts and goes damp fast.
• Mylar emergency blanket under the straw — a cheap and genuinely useful reflective layer.

Two exits, and where the door faces

A shelter with one opening is a dead end. Cats read it that way, and a cat that has been cornered once will not go back in. Two openings on different walls let a cat leave by the far side when a fox, dog or rival tom arrives at the near one.

Orientation:

• Face the main entrance away from prevailing wind, which in most of the UK and northern Europe means facing east or south-east.
• Set the openings slightly above floor level so straw and warm air are not pushed out of the doorway.
• Add a flexible flap or a short internal baffle wall for winter. A baffle — a short partition just inside the door — blocks wind without needing the cat to learn a flap.
• Place the shelter against a wall, fence or hedge, with a clear sightline out. Cats want cover behind and visibility in front.

Heated shelters and safety

Heated pads made for outdoor pet use draw very little power and warm to roughly body temperature rather than glowing hot. They are worth it for elderly or unwell cats in hard winters. Some rules are non-negotiable:

• Use only pads rated for outdoor and unattended use, with a chew-resistant steel-wrapped cord.
• Run power through an RCD-protected outdoor socket, with the cable routed off the ground and shielded.
• Never use a household heat lamp, human electric blanket or space heater. These start fires.
• Keep part of the shelter unheated so the cat can move off the pad if it gets too warm.

For most healthy cats a well-insulated, straw-filled, raised shelter is enough. Insulation is a better investment than electricity, and it does not fail in a power cut.

Feral and community cat colonies

Feral cats have the same physical needs as an owned cat, plus one more: they must not feel exposed while approaching. Shelters set out in the open often stay empty even in bad weather.

• Place shelters along a wall, hedge or fence line, never in the middle of an open space.
• Provide more shelters than cats so no individual can control access to all of them.
• Keep food and water several metres away. Food at the door attracts rodents and rival animals to the sleeping site.
• Use unpainted or dark, matte shelters that blend in and attract less human attention.
• Check them before winter and again mid-season. Straw settles, seams open, and a leaking shelter is worse than none.

Which cats cope outdoors

Coat type changes the maths considerably. Semi-longhaired working breeds such as the Norwegian Forest Cat, Siberian and Maine Coon carry dense water-resistant double coats bred for northern winters. At the other end, the Sphynx has no protective coat at all, and Cornish and Devon Rex coats are too thin to insulate.

Below roughly 7 °C every cat needs reliable shelter. Below freezing, thin-coated breeds, kittens, cats over about ten, and any cat that is underweight or unwell should be indoors, not managed with a better box. Coat and adult weight for 75 breeds are listed in the cat breeds list.

Outdoor cat house questions