SANG: suitable alternative natural greenspace
A SANG gives new residents somewhere to walk instead of a protected heath or estuary. If your site sits in a zone of influence, a contribution or a bespoke SANG is not optional.
A SANG is a suitable alternative natural greenspace: a piece of accessible countryside created or improved so that people who move into new homes walk their dogs there instead of on a protected heath or wetland. It exists to solve one problem, which is recreational disturbance to birds and habitats on European sites. If your scheme sits inside a designated zone of influence, the council will expect either a contribution towards a strategic SANG or a bespoke SANG of your own, and it will refuse the application without one.
That is the sang planning meaning in practice. The rest of this page explains where the duty comes from, how the zones are drawn and what the numbers usually look like.
The problem a SANG is designed to fix
Lowland heaths and coastal wetlands in southern England support ground-nesting birds. Nightjar, woodlark and Dartford warbler on the heaths, overwintering waders and brent geese on the estuaries. Dog walking, off-path use, cat predation near boundaries and general trampling all reduce breeding and feeding success, and the effect scales with how many households live within easy walking or driving distance.
New housing therefore adds pressure even when it is nowhere near the boundary. A council cannot mitigate that by fencing the designated site, so the accepted approach is to give new residents somewhere better to go: circular walking routes of a decent length, car parking, dogs off lead, no livestock, and a landscape that feels like open countryside rather than a formal park.
The Habitats Regulations duty behind it
The mechanism is regulation 63 of the Conservation of Habitats and Species Regulations 2017. Before granting permission for a project likely to have a significant effect on a Special Area of Conservation or Special Protection Area, either alone or in combination with other projects, the competent authority must carry out an appropriate assessment. Ramsar sites are treated the same way as a matter of national policy.
Recreational disturbance is one of the in-combination effects that has been assessed across whole housing markets rather than scheme by scheme. Where a council has an adopted mitigation strategy, the appropriate assessment for an individual application becomes short: the scheme pays into the strategy, the strategy has capacity, no adverse effect on integrity. Without the strategy, each applicant would need their own ecological case, which is slow and rarely succeeds for a small site.
Zones of influence and how councils apply them
Zones are drawn as distance bands from the designated site boundary, and the distances differ between strategies. The pattern most people meet is the one used around the Thames Basin Heaths Special Protection Area.
| Band | Typical policy position |
|---|---|
| Within 400 metres of the boundary | Net additional dwellings normally resisted outright |
| 400 metres to 5 kilometres | SANG plus access management contribution required |
| Beyond 5 kilometres | Usually outside the zone, though larger schemes may still be assessed |
Other strategies use different geometry. Around some heathland and forest designations the outer band is shorter or longer, and several coastal strategies apply a single catchment covering whole districts rather than a ring. Read the strategy your authority has adopted, because the band boundaries are mapped and a plot can sit on the wrong side of a line by 50 metres.
The trigger is net additional dwellings. A replacement house is usually neutral. An annexe or a subdivision that creates a separate dwelling is not, and neither is a change of use to residential.
Standards, tariffs and capacity
Natural England's delivery framework for the Thames Basin Heaths set a standard of 8 hectares of SANG per 1,000 new occupants, with minimum SANG sizes and a walking-route length that reflects how far a typical dog walk goes. Most later strategies borrowed the same logic even where the numbers differ.
Councils turn that into a per-dwelling tariff by bedroom count, published in a supplementary planning document or an adopted strategy. There are two elements: the SANG contribution itself, which pays for land, capital works and long-term maintenance, and a strategic access management and monitoring contribution, which funds wardens, signage and bird surveys on the protected site. The second is smaller but rarely optional.
Capacity is the part developers underestimate. A strategic SANG has a finite number of dwellings it can serve, and once allocated it is gone. If the nearest SANG is full, you are back to providing your own, which means land of the right size within a sensible distance of your site, a management plan and an endowment lasting the life of the development. Ask the council how much capacity remains before you assume a cheque will do.
These contributions sit outside the levy. Because they mitigate a specific effect of a specific scheme, they are secured as obligations rather than through the Community Infrastructure Levy, and a site can be liable for both.
How the contribution is secured
For a single dwelling or a small scheme, most councils accept a unilateral undertaking under section 106 of the Town and Country Planning Act 1990, using their own template. Larger schemes get a negotiated agreement. Either way the obligation is usually payment before commencement or before occupation, indexed, with a clawback if the permission is not implemented.
Where you are creating a bespoke SANG, expect the agreement to cover the land transfer or long lease, the capital works programme, a management plan with a defined term, the commuted sum for maintenance, and public access rights. Natural England will comment on whether the design meets the standard, and the council will want it open before the first house is occupied.
A bespoke SANG is not the same thing as public open space provided under a policy on amenity land, though the two can overlap on a large site. If you are already preparing an Open Space Assessment or a Green Infrastructure Plan, keep the SANG land separate in the accounting, because double counting is a common reason for a strategy officer to send a scheme back.
Checking whether your site sits in a zone
Do this before you offer on the land, not after.
- Find the designated site nearest your plot on the MAGIC map or the datasets published on planning.data.gov.uk, and note which designation it carries.
- Search the council's website for the mitigation strategy, avoidance strategy or habitats regulations SPD covering that designation.
- Read the map in that document, not a general constraints layer, because the zone boundary is defined by the strategy.
- If you are inside a zone, ask the council which SANG serves the address and whether it has capacity.
- Get the current tariff by bedroom count, and check when it was last indexed.
Illustrative example. A developer buys a former nursery inside the 400 metre to 5 kilometre band and expects to pay a per-dwelling tariff for 12 houses. The nearest strategic SANG has capacity for eight. The scheme either waits for the council's next SANG to come forward, reduces in size, or funds an extension to an existing greenspace, and each option changes the programme by months rather than weeks. This example is illustrative and not based on any particular site.
Where a SANG obligation applies, budget for it in the same breath as the ecology survey programme. Enter your postcode on PlanScope to see which of the 66 report types a site in a designated zone is likely to need.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
What does SANG stand for in planning?
Suitable alternative natural greenspace. It is accessible informal countryside provided or improved to draw recreational pressure away from a European designated site, so that new housing within a zone of influence does not add disturbance to protected birds and habitats on that site.
Which developments have to provide a SANG contribution?
Schemes creating net additional dwellings inside a mapped zone of influence. That includes subdivisions, annexes forming separate dwellings and changes of use to residential. A like for like replacement dwelling is usually treated as neutral, but the council still records the assessment.
How is a SANG contribution different from the levy?
The levy funds general infrastructure and is charged per square metre under a published schedule. A SANG contribution mitigates a specific effect of a specific scheme under the Habitats Regulations, so it is secured through a planning obligation. A site can be liable for both at once.
Can I provide my own SANG rather than pay a tariff?
Yes, and on larger sites it is often necessary because strategic greenspaces have finite capacity. A bespoke SANG needs land of the right size and character, a management plan for the life of the development, an endowment for maintenance and public access secured by agreement.
How do I find out whether my site is in a zone of influence?
Identify the nearest designated site using the MAGIC map or the planning datasets, then find the council's adopted mitigation or avoidance strategy for that designation and read its own map. General constraints layers are not reliable, because the zone boundary is defined by the strategy document.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.