You may see a large waterfall on many pools and not even realize a grotto is hidden behind it.
A swimming pool grotto or cave is basically a concrete room attached to the pool. The walls and the roof are constructed of gunite or shot-crete. There are special engineering requirements for construction of a swimming pool cave. Grottos may include a bench or loveseat where you can sit and view the water falling in front of you. They can also feature fiber-optic lighting, a sound system, and hydrotherapy jets.
Grottos are becoming more popular because they create a mystery as far as ‘What is behind the waterfall?’
Caves and grottos create a sense of mystery in your pool, hinting at a secluded entryway that’s just begging to be discovered. Surrounded by rock work, waterfalls, slides, colored lights, and more, grottos offer a unique space to relax and cool off in the shade.
Grottos are typically made of faux rock, reinforced with steel, and stained to match the color of the surrounding natural boulders. They can also be made of natural rocks.
A typical “swim-in grotto” costs $10,000, which includes installation of a foundation to support that rock weight. There is a cheaper option: A rock waterfall without a grotto can cost$3,000 to $4,000 since the water can just be cascaded over the rock.
These sensational water features add a sense of timelessness and enchantment while also bringing musical harmony to a setting. Whether created from natural rock or composite materials, they transform an ordinary pool into a mystical hideaway.