The tilted balance, in plain English

Most of what governs whether land gets permission is decided locally, through the development plan and the specific merits of a scheme in its setting. But sitting above all of it is a national rule that, when it bites, can tilt the whole decision. Planners call it the tilted balance. If you own land that might one day be built on, it is the single most useful piece of policy to understand, because it can be the difference between a refusal and a consent on otherwise similar sites.

This is a plain-English explanation, not legal advice, and the exact wording of national policy is revised from time to time. Treat it as the shape of the thing rather than the last word, and always check the current position for your own council.

Every council has to keep land ready

National policy expects each local planning authority to be able to demonstrate a deliverable supply of housing land, measured against how many homes the area is supposed to deliver. The shorthand is the “five-year housing land supply”, or 5YHLS: enough sites, realistically deliverable, to cover the next five years of need.

This is not a paperwork exercise. It is the mechanism meant to keep homes coming forward. If a council can point to five years of supply, it is broadly in control of where and when development happens, and it can turn down sites it does not favour with confidence. If it cannot, national policy takes some of that control back.

What happens when the supply runs short

When a council cannot demonstrate a five-year supply, the framework’s presumption in favour of sustainable development is engaged in a stronger form. In practice this means the policies in the local plan that would normally be used to resist a housing scheme are treated as out of date, and permission should be granted unless the harm of doing so would clearly and significantly outweigh the benefit of the homes.

That is the tilted balance. The scales, which normally sit level between a scheme’s benefits and its harms, are tipped toward approval. It does not guarantee consent, and it leaves the constraints that survive it firmly in place, such as the Green Belt, flood risk or a designated landscape. But on an unallocated site next to a town, in a district that is short of supply, it can be decisive. It is why the same field can be a refusal under a council with a healthy supply and a consent under a council that has fallen behind.

Why this matters to you as a landowner

Two sites can look identical from the road and be worlds apart in planning terms, because of which council they sit in and how that council’s supply is doing. A landowner who does not know where their authority stands is negotiating in the dark.

Supply positions also move. A council can slip below five years when a large allocated site stalls, or when a raised housing target or an ageing local plan moves the maths against it. When that happens, land that was a firm no for years can suddenly become promotable. The owners who do well are usually the ones who understood the position early and were ready, not the ones who found out when a developer knocked with an option agreement already drafted.

There is a catch worth naming. Unlike national datasets for flood zones or designations, there is no single official live feed of every council’s five-year supply. The figure is calculated authority by authority and dates quickly, and it is frequently contested at appeal. Knowing the real, current position for a specific council is work in its own right, and it is exactly the sort of local knowledge a good promoter should hold rather than guess at.

How to find where your council stands

You can start yourself. Two national indicators are public and give a useful first read:

• The Housing Delivery Test. A yearly government measurement of whether an area has delivered the homes it needed over the past three years. A low score is a strong signal that supply is under pressure, though it is a lagging figure and always carries the year it was measured.
• Whether the local plan is up to date. An old or stalled plan is often a sign that the supply position is fragile.

Beyond that, the current five-year supply figure usually has to be pieced together from the council’s own monitoring, recent appeal decisions and local plan evidence. That is where a promoter earns their place.

Our Land Potential Check does the first part for you automatically. Enter a postcode, or drop a pin, and it reads your land against national planning data, including the Housing Delivery Test result for your council and the constraints that would still apply whatever the supply position. Where we hold a current five-year supply figure for your area, we include it; where we do not, we tell you plainly that we will check it by hand rather than pretend a national feed exists. It is an indication drawn from open data, never a valuation or a planning judgement, and it is the honest place to start.

Either way, knowing which way the balance leans on your own land is worth having, ideally before a developer knows it first.