The short answer
There is no single right answer — it depends on budget, how often you want to swim and how much upkeep you'll accept. An outdoor pool is the lower-priced route, typically £30,000–£100,000+, simpler to build and cheaper to run seasonally, but limited to warmer months and more prone to leaves and debris. An indoor pool costs far more — often £85,000 to well over £200,000 because it needs a building, ventilation and dehumidification — and more to run year-round (commonly £500–£600 per month), but you can swim in any weather and it stays cleaner. A heated outdoor pool with a cover or a glass enclosure is a middle ground. The right choice balances upfront cost, how much you'll use it, running cost and upkeep.
The indoor-versus-outdoor decision is really a trade-off between upfront price, how often you'll actually swim, and the running cost you're willing to carry. Here is how the two compare on the things that matter.
At a glance
- Outdoor pool~£30k–£100k+, seasonal use
- Indoor pool~£85k–£200k+, all-year use
- Outdoor running costlower, seasonal heating
- Indoor running cost~£500–£600 / month
- Middle groundcovered / enclosed outdoor pool
How they compare
An outdoor pool is the lower-priced and simpler build: no room to construct, and you only heat it during the season, so seasonal running cost is lower. The trade-offs are weather-limited use and more cleaning, since leaves and debris collect. An indoor pool costs considerably more up front — on average around £25,000 more than the equivalent outdoor pool just for the pool, before the building — because you need construction, specialist ventilation and dehumidification to manage moisture. In return you swim year-round in any weather and the water stays cleaner. Running cost is the catch: heating water and room together, all year, commonly lands around £500–£600 per month.
| Factor | Outdoor pool | Indoor pool |
|---|---|---|
| Install cost | ~£30k–£100k+ | ~£85k–£200k+ |
| Use | warmer months | all year, any weather |
| Running cost | lower (seasonal) | higher (~£500–£600/mo) |
| Cleaning | more (leaves, debris) | less (sheltered) |
| Building work | none | room / extension needed |
General comparison for guidance; figures depend on size and spec. Sources: Deep End Pools and Eagle Leisure comparison guides.
How to choose for your home
- Tight budget, occasional summer use? An outdoor pool is the lower-priced and simpler choice.
- Want to swim all year? An indoor pool earns its higher cost through year-round, weather-proof use.
- Want fewer leaves and less cleaning? Indoor — or a covered/enclosed outdoor pool — stays cleaner.
- Like the idea of both? A heated outdoor pool with a good cover or a glass enclosure is a sensible middle ground that extends the season without full indoor running costs.
Want help weighing indoor vs outdoor?
We'll match you with a vetted swimming pool installer who can quote both options for your site, with install cost, running cost and upkeep set out clearly.
Frequently asked questions
Is an indoor or outdoor pool lower in cost?
An outdoor pool is the lower-priced route, typically £30,000–£100,000+, while an indoor pool often runs £85,000 to well over £200,000 because it needs a building, ventilation and dehumidification on top of the pool itself.
Does an indoor pool cost more to run?
Yes. An indoor pool heats both the water and the room and runs ventilation and dehumidification year-round, commonly around £500–£600 per month, whereas an outdoor pool is only heated through the season.
Is there a middle ground between indoor and outdoor?
Yes — a heated outdoor pool with a good cover, or an outdoor pool with a glass enclosure, gives shelter and a longer season without the full cost of an indoor pool building.
Sources & further reading
- Deep End Pools — indoor vs outdoor pool costs
- Eagle Leisure — indoor vs outdoor in-ground swimming pool
Figures on this page are typical UK ranges drawn from published sources and depend on your specific property. They are guidance, not a quotation.