Pool with an enclosure

How it is calculated

For an in-ground pool the system counts the excavation with overdig, a gravel and concrete base with mesh, concrete backfill along the sides, the shell, skimmers, inlets, the main drain, piping, a filter with pump, dosing, a heat pump, coping and the walkway. An above-ground pool is calculated without earthworks.

The filter is sized so the water turns over in 3 hours (HN 109 Table 1). The telescopic enclosure is calculated by area with an offset from the edge.

Safety and hygiene

- From 2027-01-01 pools deeper than 20 cm need "special protection" (STR 2.02.12:2026 item 11). The regulation does not say what kind, so the system offers a fence with a self-closing gate or a safety cover.

- HN 109:2016 figures — turnover in 2.5–3 h, suction grate gaps ≤ 8 mm, a "no diving" sign below 1.8 m depth — are used as good practice. Whether the norm applies to a private pool is unconfirmed.

- When draining, active chlorine must be ≤ 0.6 mg/l into the sewer and ≤ 0.1 mg/l into the environment (Waste Water Regulation).

- We have not checked the enclosure snow load or heat pump sizing; the system warns about them.

Permits

- An in-ground pool is usually a group I engineering structure (K = S × H³ with H measured to the bottom, e.g. 6 × 3 × 1.5 m gives K ≈ 88); no building permit. A small above-ground pool (K < 10) is not a structure.

- The enclosure span may not exceed 6 m (STR 1.01.03 item 31), otherwise it is no longer a simple structure.

- An open pool closer than 1 m to the boundary needs the neighbour's consent (STR 1.05.01 Annex 7 item 3). With an enclosure item 4 applies: within 1–3 m it may not be higher than its distance to the boundary.