London's emergency housing compromise

London’s housing crisis is often described as a problem of ambition. In reality, it is increasingly a problem of deliverability. The capital does not lack sites, need, policy aspiration or political attention. What it lacks, too often, is the ability to convert consented or consentable schemes into homes on the ground.

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That is the context for the Government and Mayor of London’s support package for housebuilding, and for the Greater London Authority’s adopted Support for Housebuilding London Plan Guidance. The measures are deliberately temporary. They are also unusually candid. They recognise that parts of the London planning system, as applied in recent years, have become difficult to reconcile with present market conditions. Rising build costs, expensive finance, weaker sales values, planning complexity and infrastructure obligations have combined to make many schemes marginal or undeliverable. The package is intended to respond to that reality, rather than pretend it is not there.

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The immediate significance lies in three areas: affordable housing, design standards and cycle parking. Each change is technical in form, but strategic in effect.

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The most commercially important measure is the new time-limited planning route for affordable housing. On private land, qualifying schemes providing at least 20 per cent affordable housing can proceed without a full viability assessment, provided the relevant criteria are met. On public land, and certain industrial land where capacity is not re-provided, the threshold is 35 per cent. The route is open to applications submitted and validated before 31 March 2028.

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That matters because viability has become one of the most time-consuming and uncertain parts of major residential planning in London. It is not just the technical exercise itself. It is the negotiation, scrutiny, challenge, reworking and delay that often follows. For marginal schemes, delay is not neutral. It can worsen funding terms, undermine landowner confidence, increase holding costs and push construction further out of reach. A route that replaces prolonged viability debate with a clearer affordable housing threshold is therefore a material intervention.

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The package is not, however, a simple reduction in affordable housing expectations. It is better understood as a trade-off. The planning system is accepting, for a defined period, that a lower but deliverable affordable housing contribution may be preferable to a higher theoretical contribution on a stalled site. That is an uncomfortable but practical proposition. A consent that cannot be built delivers no market housing, no affordable housing, no CIL, no public realm and no regeneration benefit. The question is whether certainty at 20 per cent unlocks more real homes than prolonged negotiation around a higher figure.

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The answer will vary by site. For some schemes, the route will be genuinely helpful. It may allow landowners, funders and registered providers to align around a more predictable planning position. For others, the deeper viability problem may remain. A reduction in negotiation does not remove construction inflation, sales risk, remediation cost or interest-rate pressure. It simply reduces one layer of uncertainty.

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The associated CIL relief is therefore important. The Government’s package proposes temporary partial relief from borough CIL for eligible schemes, with relief linked to the level of social and affordable housing provided. The relief is designed to operate alongside the planning route and is intended to help schemes that remain marginal even with a clearer affordable housing position.

 

This is where the package becomes more than a planning policy adjustment. CIL has often been treated as a fixed cost of development, separate from viability negotiation. In strong markets, that is understandable. In weaker conditions, it can become one more reason why otherwise acceptable schemes do not start. The temporary relief recognises that infrastructure funding and housing delivery are connected. If too many schemes fail to commence, the public sector does not secure either new homes or meaningful infrastructure receipts.

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The second major change is the relaxation of guidance that has constrained density, particularly around dual-aspect homes and the number of units accessed from a single core. The final guidance removes or replaces previous guidance that had encouraged all homes to be dual aspect and limited the number of homes per core per floor. London Plan Policy D6 still applies, so the underlying requirement for high-quality housing has not disappeared. Daylight, outlook, privacy, ventilation, overheating and internal living conditions remain central considerations.

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This distinction is important. The package does not create a licence for poor housing. It creates more room for judgement. A single-aspect home is not automatically unacceptable. A larger number of units around a core is not automatically harmful. The planning question should be whether the homes work in their specific context: their orientation, depth, outlook, ventilation strategy, daylight performance and relationship to neighbours. That is a more nuanced test than applying a rigid numerical expectation.

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There is a planning risk here. Flexibility can be productive when it supports intelligent design. It can be damaging if it becomes a shortcut for overdevelopment. Officers are likely to look closely at whether applicants are using the guidance to solve genuine viability and delivery problems, or simply to push density without sufficient quality. The schemes most likely to benefit will be those that show, with evidence, that the design remains robust despite departing from previous guidance expectations.

 

Cycle parking follows the same pattern. The temporary reduction in minimum requirements is not an abandonment of cycling policy. It is an acknowledgement that excessive basement or podium cycle provision can have real cost and design consequences, particularly on constrained urban sites. The guidance allows more flexibility in how provision is delivered, including shared spaces, hire schemes, on-street solutions and folding-cycle storage, provided the result remains secure, accessible and usable.

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This may sound modest, but it can be significant. Basement excavation, podium structures and complex internal storage arrangements can materially affect build cost and efficiency. In some cases, the difference between a policy-compliant but expensive cycle arrangement and a more proportionate solution may be part of the wider viability equation. The practical test will be whether boroughs accept alternative provision as genuinely functional, rather than viewing it as a dilution of sustainable transport policy.

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The package also has a political dimension. It signals a more interventionist role for City Hall and central government in London housing delivery. The Government’s policy paper refers to expanded Mayoral planning powers, including changes intended to allow the Mayor’s powers to be used more effectively where housing delivery is at stake. It also confirms the allocation of £324 million for a City Hall Developer Investment Fund aimed at stalled sites capable of delivering homes quickly.

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For applicants, the practical implication is clear. The next two years create a window. Schemes that are marginal, stalled or being reconsidered should be reviewed against the new route quickly. That review should not be limited to affordable housing. It should consider CIL, design efficiency, cycle parking, phasing, funding, grant availability, registered provider interest and the likely borough response. Some existing permissions may need a section 73 application and deed of variation. Some emerging schemes may need to be repositioned before submission. Others may be better left outside the route if they can still justify a stronger position under existing policy.

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The main risk is assuming that the package does the work by itself. It does not. It gives applicants a stronger framework, but the planning case still needs to be made carefully. Boroughs will still scrutinise design quality, amenity, transport, heritage, servicing, fire safety, play space, public realm and the wider planning balance. A scheme that is weak on fundamentals will not become acceptable simply because it meets a temporary affordable housing threshold.

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The better reading is that London has entered a period of pragmatic planning. The system is being asked to distinguish between standards that protect quality and standards that, when applied inflexibly, prevent delivery. That is not an easy distinction. It will require judgement from boroughs, discipline from applicants and a willingness to accept that perfect policy compliance is not always the same as good planning.

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For developers and landowners, the opportunity is real but time-limited. The strongest cases will be those that can demonstrate a clear delivery problem, a credible construction route, a defensible design, and a transparent affordable housing offer. The weakest will be those that treat emergency flexibility as a general invitation to reduce obligations.

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The package is ultimately a test of whether London can move from aspiration to delivery without abandoning quality. That is the balance the next two years will need to strike.