NPPF Annex 2 typology
NPPF Annex 2 categorises open space into parks and gardens, natural and semi-natural, green corridors, amenity greenspace, provision for children and young people, outdoor sports facilities, allotments, and cemeteries[NPPF (Dec 2024)]. SPDs translate each typology into a £/dwelling rate; the estimator rolls these into a single rate per LPA.
On-site versus commuted sum
Schemes above the LPA threshold (typically 50 units) are expected to deliver open space on-site to the LPA's adopted standard (Fields-in-Trust benchmarks are widely cited). Where the scheme cannot meet the standard on-site, the shortfall converts to a commuted sum plus a 20-year maintenance contribution.
20-year maintenance commuted sum
The maintenance commuted sum capitalises 20 years of management cost (mowing, tree work, equipment replacement). The LPA assumes adoption of the open space once the commuted sum is paid; private management company arrangements remain common in larger urban-extension schemes.
Play space and youth provision
Provision for children and young people typically carries a dedicated per-dwelling rate (£200 to £800) reflecting Fields-in-Trust equipped playground capital cost. Sport England capital costs feed the outdoor sport line in similar fashion.