The Art of the Deal: How Planning Obligations Have Become the Defining Skill in British Property Development
There is a conversation that happens in the boardrooms of Britain's most successful development companies that rarely surfaces in public discourse. It is not primarily about architecture, construction methodology, or even land pricing. It is about planning obligations—the intricate web of Section 106 agreements, Community Infrastructure Levy contributions, affordable housing requirements, and viability assessments that now determine whether a project lives or dies.
For those who have mastered this terrain, it represents a sustainable competitive advantage. For those who have not, it is increasingly the reason why potentially viable sites remain undeveloped, and why the gap between the development sector's elite tier and its mid-market operators continues to widen.
The Evolution of Planning Obligations
Section 106 of the Town and Country Planning Act 1990 was conceived as a mechanism for ensuring that development contributed proportionately to the infrastructure and services it would generate demand for. In principle, it remains exactly that. In practice, it has become considerably more complex.
The introduction of the Community Infrastructure Levy in 2010, intended to provide a more transparent and standardised alternative to negotiated obligations, did not replace Section 106 so much as sit alongside it—creating a dual-track system that requires developers to understand both regimes simultaneously. Add to this the Affordable Housing requirements that vary significantly between local planning authorities, the emerging requirements around biodiversity net gain, and the increasingly assertive use of planning conditions, and the picture that emerges is one of formidable technical complexity.
What is striking is how unevenly this complexity is distributed across the market. Large housebuilders and specialist developers maintain dedicated planning teams—sometimes numbering dozens of professionals—whose sole function is to navigate, negotiate, and where appropriate challenge these obligations. Smaller operators, by contrast, frequently rely on external planning consultants who may lack the institutional knowledge or negotiating experience to achieve comparable outcomes.
The Viability Assessment: Battleground of the Modern Planning System
At the centre of most significant planning negotiations sits the viability assessment—a financial model that purports to demonstrate whether a proposed scheme can sustain the obligations a local planning authority wishes to impose, whilst still delivering an adequate return to the developer.
In theory, viability assessments are objective technical documents. In practice, they are contested instruments whose outputs depend substantially on the assumptions fed into them: land value benchmarks, build cost estimates, sales value projections, and the all-important developer's profit margin that the model treats as a fixed requirement rather than a variable.
Experienced developers understand that the assumptions underpinning a viability assessment are not merely technical choices—they are negotiating positions. The selection of comparable land transactions to establish benchmark value, the treatment of abnormal costs, and the methodology applied to projected revenues can each shift the headline viability conclusion by millions of pounds. Authorities that lack the in-house expertise to interrogate these models are at a structural disadvantage.
This is not, it should be said, necessarily indicative of bad faith on the part of developers. Viability assessments reflect genuine uncertainty about future market conditions, and developers who accept obligations that genuinely undermine scheme viability do not serve anyone's interests. The problem is that the process is not transparent enough to allow observers—including local communities—to distinguish between legitimate viability concerns and strategic positioning.
The Two-Tier Market
The skills gap in planning negotiation has produced a development market that operates on two distinct levels, with consequences that extend well beyond individual transactions.
At the upper tier, sophisticated operators approach planning obligations not as costs to be minimised but as variables to be structured. They understand which authorities are genuinely constrained by adopted policies and which have flexibility to negotiate. They know when to challenge a CIL liability on the grounds of exceptional circumstances and when to accept it as a cost of doing business. They are adept at structuring phased obligations that align payment triggers with project cashflow, reducing the capital intensity of early-stage development.
Perhaps most significantly, they understand the value of relationships. Planning officers are public servants operating under considerable resource pressure. Developers who engage constructively, provide well-prepared documentation, and demonstrate a track record of delivering on commitments accumulate a form of reputational capital that has tangible commercial value. Pre-application discussions with well-resourced developers frequently result in a clearer path to consent than the formal application process alone would suggest.
At the lower tier, developers without these capabilities frequently encounter a system that feels arbitrary and opaque. Sites that could be viable with skilled negotiation remain undeveloped because the expertise required to unlock them is not accessible at a price that works for smaller operators. This is not a marginal inefficiency—it is a structural constraint on housing supply that receives far less attention than it deserves.
Could Standardisation Change the Calculus?
The case for greater standardisation of planning obligations is not new. Various reviews of the planning system—including the 2020 Planning for the Future White Paper and the subsequent Levelling Up and Regeneration Act—have wrestled with the tension between the flexibility that negotiated obligations provide and the uncertainty they create for developers and communities alike.
A more standardised approach—with published tariffs, transparent viability benchmarks, and reduced scope for case-by-case negotiation—would, in theory, reduce the skills premium that currently advantages well-resourced operators. Smaller developers would be working from the same rulebook as their larger competitors, with fewer opportunities for sophisticated operators to extract advantage through superior negotiating capability.
The counterargument is that standardisation sacrifices the flexibility that makes the current system capable of responding to genuinely complex sites. A Victorian warehouse conversion in a depressed northern market has a fundamentally different viability profile from a greenfield scheme on the fringes of a prosperous commuter town. A system of fixed tariffs that cannot accommodate this variation risks either under-extracting value from profitable schemes or rendering marginal sites undeliverable.
The most credible reform proposals therefore tend to involve a combination of greater transparency—publishing viability assessments as a matter of course, for example—alongside standardised benchmarks for the most common obligation types, whilst preserving negotiated flexibility for genuinely exceptional circumstances.
What This Means for the Serious Developer
For developers operating at the level of sophistication that complex sites demand, the current system—whatever its inefficiencies—rewards expertise. The ability to navigate Section 106 negotiations, structure viable affordable housing proposals, and engage constructively with planning authorities is not a peripheral competence. It is, increasingly, the central competence that separates developers who can unlock difficult sites from those who cannot.
At HMS Developments, our approach to planning obligations reflects this reality. We invest in the expertise, the relationships, and the analytical rigour that complex negotiations require—not because we seek to minimise our contribution to the communities in which we build, but because we understand that a scheme that cannot be viably delivered serves no one's interests.
The planning system is imperfect. But for those who understand it deeply, it remains a mechanism through which genuine development value can be created—and through which the most challenging sites can be brought to life.