Planning Approval Is Not the Same as Commercial Definition.
Planning approval is a legal permission.
It confirms that a scheme, as drawn, is acceptable to the local authority in terms of massing, use class, and policy compliance. It is a significant milestone and the result of considerable time, cost, and professional effort. It is also frequently mistaken for something it is not: proof that the development has been commercially defined.
What Planning Approval Does Not Confirm
A planning approval does not confirm that the apartment mix reflects who is actually buying in that market. It does not confirm that the layouts will perform well enough at viewing to achieve the asking price without negotiation, nor that the specification decisions that follow will be calibrated to the buyer's expectations rather than the procurement team's convenience. And it does not confirm that anyone, at any point in the process, has asked the question that determines commercial performance more than any other: who is this development for, and will they pay a premium for it?
The architect appointed at the planning stage is designing for a specific objective: to secure consent.
The drawings that achieve it are optimised for policy compliance, daylight modelling, and officer negotiation. They are not optimised for the buyer who will stand in the completed flat and decide whether it justifies the price.
Those are different problems, and they require different thinking.
The Gap Between Compliance and Commercial Performance
The consequence of this distinction is visible in the pricing data of most new-build residential schemes. A development approved at planning will have fixed floor areas, fixed room counts, and a fixed relationship between circulation and usable space. What is not fixed, at the point of planning approval, is whether those spatial decisions will support the asking price with confidence. That is determined later, by decisions made in the detailed design phase, and in most development processes those decisions are made reactively rather than strategically.
Savills' research on new-build pricing in competitive urban markets highlights the gap between schemes that achieve asking price at launch and those that require price adjustments or extended incentive packages to clear. The differentiating factor is rarely the specification. It is the coherence of the spatial design and the clarity of who the development is positioned for. Both of those are post-planning decisions. In most cases, they are also under-managed ones.
Where Commercial Definition Sits in the Process
Commercial definition sits between planning approval and detailed design.
It is the point at which the developer should be asking, with discipline and evidence: does this layout, as approved, perform commercially at the price we need to achieve? Is the buyer profile clear enough to make specific decisions about room proportions, storage, finish grade, and communal areas? Are there adjustments available within the approved envelope that would materially improve performance, and if so, are we making them deliberately rather than waiting to see how the market responds?
Knight Frank's buyer research points to the consistent importance of spatial logic in new-build purchasing decisions, with buyers identifying layout quality as the primary determinant of whether a development feels worth the price. That judgment is formed within the first few minutes of a viewing. The decisions that shape it were made, or not made, months earlier during a phase of the development process that most developers pass through without sufficient commercial scrutiny.
The Practical Consequence
A development that reaches practical completion without commercial definition applied after planning approval is, in most cases, a development that will sell at a discount to its potential.
That happens because the spatial decisions that determine buyer confidence were made by the architect for compliance purposes and never revisited through a commercial lens.
Property Week has shown that the developers sustaining margin most effectively in the current market are those who treat the post-planning phase as a commercial design opportunity rather than an administrative one. The planning drawings are the start of the detailed design process, not the conclusion of it. The commercial performance of the development is determined in the gap between the two.
Raquel Aparicio is the founder of Mar Design, where she advises residential developers and boutique hospitality operators on market-aligned design strategy to improve GDV, ADR, pricing confidence, and long-term asset performance.
