Seasonal · 4 min read · Updated 6 November 2026
When is the best time of year to build a catio in the UK?
A month-by-month view
| Time of year | What to do | Things to watch |
|---|---|---|
| January to February | Measure up, choose a design, get quotes | Short days, wet ground for posts |
| March to May | Ideal install window | Book early, spring is busy |
| June to August | Fine for building, add shade | Heat inside roofed sections |
| September to October | Good second window, gardens cut back | Leaves on mesh roofs |
| November to December | Repairs, small kits and window boxes | Frost on fresh concrete, little drying time |
Why spring is the popular choice
Longer days and milder weather mean cats naturally want to be outside more from April onwards. Getting the enclosure built in spring gives an indoor cat several months to get used to it in comfortable weather, which makes the transition easier.
Spring also tends to be the busiest period for garden structures generally, so lead times for bespoke work can stretch. If you want a particular month, start getting quotes a couple of months earlier.
Building in autumn and winter
Autumn is underrated. Borders are cut back, so it is easier to see fence lines, gaps and climbing routes, and there is less disruption to planting. Timber treated and coated in early autumn has time to settle before the worst weather.
Mid-winter builds are possible, especially for window boxes and modular kits that need little ground work. For larger catios, concrete for posts needs protection from frost while it cures, and timber stains need dry weather. A good installer will advise if a week is too wet or cold for a particular stage.
If you are adopting a cat in winter, building a small window box first and adding a larger catio in spring is a practical way to spread the work and the cost.
Keeping a catio cool in summer
- Shade at least part of the enclosure all day, with a solid or shade-cloth roof section
- Avoid clear polycarbonate over the whole roof, as it can trap heat like a greenhouse
- Keep plenty of mesh walls for airflow
- Provide fresh water in a heavy bowl that cannot be tipped
- Give access back into the house at all times on hot days
- Place resting shelves on the shadiest side
South-facing walls get very hot in July and August. If the catio is fixed against one, a partially covered roof and access back indoors are essential rather than optional.
Making it usable in winter
Cats do not need to be outside in a cold downpour, but a covered section means they can still sit out and watch the garden on dry, bright days. A clear or tinted roof panel over one end keeps a shelf dry, and a removable windbreak panel on the most exposed side cuts draughts.
An insulated outdoor cat house with a raised floor and a fleece pad gives a warm spot. Avoid electric heat pads outdoors unless they are designed for outdoor pet use and the cable is protected from chewing and weather.
Seasonal maintenance tie-ins
Whenever you build, plan a quick check at the turn of each season: clear leaves off mesh roofs in autumn, check for frost heave and loose posts after winter, re-tension mesh and re-coat timber in spring, and trim back plants that have grown towards the enclosure in summer.
How to plan backwards from your ideal date
If you want your cat outside by a particular point, such as the start of the summer holidays or before a new kitten is old enough to go out, work backwards. A typical bespoke project has three stages before the cat ever sets foot inside: design and quoting, ordering materials, then installation and finishing.
- Eight to ten weeks before: measure the space, take photos and request quotes
- Six to eight weeks before: agree the design, check any planning, lease or neighbour points
- Four to six weeks before: materials ordered, date booked
- Install week: allow a spare day for rain
- One to two weeks after: let stains and coatings dry and air before use, then introduce the cat
Kits and window boxes move faster, often within a couple of weeks, but popular models can sell out in spring. New kittens should not use any outdoor enclosure until they have finished their vaccinations, are microchipped and are confident around the house, so time the build to suit them.
Frequently asked questions
How long does a catio take to build?
A cat window box or small kit can often be fitted in a few hours. A bespoke walk-in catio is typically one to three days on site, depending on size, ground work and whether it attaches to the house. Allow extra time beforehand for design and ordering materials, which is where most of the waiting happens.
Can I use a catio in a heatwave?
Yes, as long as the cat can choose to go back indoors and there is deep shade and water. On the hottest days cats tend to rest quietly in the coolest spot available. Keep an eye on older, overweight or flat-faced cats, which cope less well with heat, and close the enclosure in the middle of the day if it gets no shade.
Does wet weather damage a new catio?
Not if it is built from properly treated timber and galvanised or coated mesh. Rain during installation can delay staining and concrete work, and very wet ground can make posts harder to set accurately. Once finished and coated, a well-made catio should handle normal UK weather without problems, with an annual check of fixings and timber.
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