Call-in before the plan? Developers need to think in three dimensions
Under new proposals, metro mayors will be able to call in schemes of 150+ homes, before spatial development strategies have even been completed. Where does that leave developers? Simon Prescott offers some strategic thinking
Andy Burnham? No. Sir Keir Starmer, in June. That is the clue to the latest planning announcement. Burnham is accelerating a transfer of power he inherited, not inventing one.
Nor is this a nationwide copy of Sadiq Khan’s recent 50-home intervention threshold. London’s three-stage call-in system, operating since 2008, is the precedent. The Starmer Government legislated the principle for mayors elsewhere; Burnham’s is consulting on how it should operate.
Under the proposals, mayors could begin calling in schemes of more than 150 homes, alongside major commercial and tall-building projects, from early 2027 – while spatial development strategies (SDSs) are still being prepared.
That creates an awkward interim period, and the consultation more or less admits it. Applications will still be tested against the adopted development plan and material considerations. At the same time, mayors will be asking whether schemes fit the emerging shape of growth. Developers may have to argue in two policy periods at once.
But the call-in power is the headline. The SDS is the real battleground. By the time an application reaches the mayor, choices about growth geography, infrastructure and political priority may already have been made.
Mayors will not just comment from the sidelines. They will shape the SDS, influence the consent route through call-in and mayoral development orders, and may help decide what gets funded through a mayoral community infrastructure levy.
Why this attempt is different
County structure plans once set the broad distribution of growth, leaving local plans to identify sites. Regional spatial strategies followed, before their abolition left England dependent on voluntary cross-boundary cooperation.
“Strategic planning struggles when local support falls away, or when the spatial case has not been properly made”
The record is mixed. Greater Manchester’s original framework lost Stockport in 2020 before the other nine authorities progressed Places for Everyone. The West of England Joint Spatial Plan collapsed after inspectors found no overarching spatial strategy guiding its 12 growth locations. Both examples show the same weakness: strategic planning struggles when local support falls away, or when the spatial case has not been properly made.
This time, preparing an SDS is a legal duty. Strategies can be agreed by majority vote, with mayors holding a casting vote , so an individual council cannot veto one alone. Local plans must be in general conformity with the SDS.
It has the look of the old structure-plan model, but not the same politics. A directly elected mayor, with an economic growth mandate and development management and funding powers, will sit above the local planning conversation.
Expect frogspawn, not red lines
SDSs cannot allocate individual sites, but can identify broad locations for growth: expect frogspawn on the map, with boundaries resolved through local plans.
The position and size of each blob can leave sites favoured or fighting against the current. Because exact allocations are deferred, politically sensitive choices may also be held until late in the process.
“The SDS may also become an infrastructure investment plan. London’s MCIL helped finance the Elizabeth line”
The SDS may also become an infrastructure investment plan. London’s MCIL helped finance the Elizabeth line . The Government proposes greater flexibility elsewhere to support infrastructure that benefits more than one council area. It is even consulting on whether SDS and MCIL charging schedule examinations should normally take place together. Land use strategy and cumulative viability could therefore be examined side by side.
Three planning moves developers should make now
First, make the spatial case – not just the case for the blob. Test the assumptions that drive growth: transport accessibility, employment geography, infrastructure capacity, housing need and environmental constraints. Build a case that can survive examination. A glossy site promotion will not be enough. Find out which officers, advisers and evidence commissions are shaping the strategy before the geography hardens.
Second, keep the evidence straight across the SDS, local plan and application. A proposal may have to pass through the SDS, the local plan and development management, potentially including mayoral call-in. The arguments need to hold at each scale. Before SDS adoption, mayoral support does not replace the statutory test against the adopted development plan and material considerations. Afterwards, general conformity and call-in change the weight.
Third, be clear about what the scheme delivers – and what it costs. Link homes or employment to strategic transport, infrastructure and investment priorities. Allow for the combined effect of MCIL, local CIL and section 106 contributions, and identify the infrastructure mayoral funding might unlock. The proposition has to work for the mayor and for the host authority. Trying to get the mayor to override the council is not a strategy; it is a risk.
The government wants mayors to push through a system that too often says no. Developers need to plan from SDS to application, or they may arrive at call-in after the real choices have already been made.
Simon Prescott Chairman of tor&co
