The Benefits of the New NPPF for SME Developers: Unlocking Opportunity Through Medium Sites and Flexible Affordable Housing Delivery

The publication of the eagerly awaited new National Planning Policy Framework (NPPF) this summer will represent one of the most significant shifts in England's planning landscape in recent years, and its implications for SME housebuilders look to be particularly energising. For too long, smaller developers have been constrained by a system that can favour large strategic sites, lengthy planning processes, and rigid affordable housing requirements that can render small and medium-scale schemes unviable. The new NPPF seeks to rebalance this by elevating the role of "medium sites" and introducing more pragmatic approaches to affordable housing delivery.

A New Emphasis on Medium Sites

One of the most transformative elements of the revised NPPF is the formal recognition of a new medium sites category - typically understood as developments of between 10 and 49 homes. This scale of development has historically been the backbone of SME activity, yet it has often been overlooked in local plan allocations, which tend to focus on larger, more complex sites that only major developers can realistically deliver.

The new NPPF will explicitly encourage local planning authorities to allocate a greater proportion of medium-sized sites within their housing strategies. This proposed shift could make a difference for several reasons:

• Faster delivery: Medium sites can be brought forward more quickly than large strategic sites, offering short term boosts to housing delivery.
• Lower barriers to entry: SMEs, who lack the capital reserves of volume housebuilders, can more feasibly acquire and develop medium-sized plots.
• Greater geographic spread: Medium sites are more easily integrated into existing settlements, supporting incremental growth rather than large-scale urban extensions.
• Market diversification: Encouraging SME participation reduces reliance on a small number of large developers, increasing resilience and competition in the housing market.

By elevating medium sites, the new NPPF will seek to create a more level playing field where SMEs can compete, innovate, and meaningfully contribute to national housing delivery.

Flexibility Through In-Lieu Affordable Housing Contributions

Another major barrier for SME developers has been the requirement to deliver affordable housing on site, even on relatively small schemes. While well-intentioned, this policy has often undermined viability: smaller sites struggle to absorb the cost of affordable units, and the practicalities of integrating them into small developments can be disproportionately complex.

The revised NPPF will propose a more flexible approach by allowing financial contributions in lieu of on-site affordable housing in appropriate circumstances. This change offers several benefits:

• Improved viability: SMEs can avoid the high per-unit cost of delivering affordable homes on small sites, making more schemes financially deliverable.
• Simplified design and delivery: Removing the need to integrate affordable units can streamline layouts, alleviate negotiations with registered providers, and shorten build times.
• Better strategic outcomes: Local authorities can pool contributions to deliver affordable housing where it is most needed, rather than forcing suboptimal on-site provision.

This flexibility is particularly important for medium sites, where the balance between policy compliance and commercial viability is often tightest.

A More Supportive Environment for SMEs

Taken together, the new emphasis on medium sites and the option for in-lieu affordable housing contributions represent a pragmatic move towards a more SME-friendly planning system. By reducing red tape, improving viability, and recognising the unique strengths of smaller developers, the new NPPF can position SMEs to play a larger role in tackling England's housing shortage.