Counting roof gardens towards required green space

Annex 5 to Hungarian Government Decree 253/1997 (XII. 20.) (OTÉK)

Counting roof gardens and water surfaces towards the green space required on a plot.

1. Counting continuous roof gardens with an area of at least 10 m² towards green space

Depth of topsoil above the built structure	Structure of the vegetation that can be planted, type of green roof	Proportion of the total roof garden area that counts as green space
8–20 cm growing layer or lightweight soil (substrate)	single-layer vegetation, extensive green roof	15%
21–40 cm growing layer	single-layer vegetation, semi-intensive green roof	25%
41–80 cm growing layer	two-layer vegetation, intensive green roof	40%
growing layer over 81 cm	three-layer vegetation, intensive green roof (e.g. above an underground car park, at pedestrian level)	75%

2. Counting water surfaces towards green space

Type of water surface	Proportion of the total water surface area that counts as green space
Natural water surface permanently under water (stream, lake), or artificial water surface permanently under water with an unlined bed and permanent aquatic life	100%
Artificial water surface with a lined bed, permanently under water, with permanent aquatic life	75%