Cave Pool

A private grotto pool, hidden beneath the house.

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This luxury basement swimming pool in Sydenham Hill, South London, was designed as a cave-like retreat. Every surface is clad in glass mosaic tiles, and an integrated spa pool with massage jets and cascading water features sits alongside the main pool. A skylight brings natural daylight down into the space.

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Colour-changing LED pool lighting and a recessed LED ceiling cove transform the mood from calm and serene to dramatic at the touch of a button. Energy-efficient filtration, heating and dehumidification keep the water and air comfortable all year round, and the running costs down.

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Location : Sydenham Hill, London

Project Cost : £100k

Planning a pool like this? See our indoor pool prices guide for 2026 costs.