What the Budget Means for Planning

The Autumn Budget 2026 introduced major policy adjustments aimed at accelerating housebuilding, relieving viability burdens on brownfield developments, and expanding social housing investment…

Chancellor John Healey’s measures in the Autumn Budget carry significant implications for planners, developers and local authorities.

The headline planning reform is a targeted exemption from Biodiversity Net Gain (BNG) requirements for residential brownfield developments on sites up to 1.5 hectares in England. [See point 7.11 Housing]

Introduced via the Environment Act 2021 and implemented in 2024, standard BNG rules require developers to demonstrate a minimum 10% uplift in biodiversity before securing planning approval.

The exemption responds to concerns that off-site BNG requirements place severe financial viability pressures on smaller schemes. This new exemption should reduce development costs and administrative burdens, particularly benefiting SME housebuilders that frequently purchase costly off-site units. However, key details – including the exact definition of qualifying brownfield land and the implementation timeline – are still awaiting full clarification from the government.

The decision has, however, drawn criticism from environmental advocates. Dom Higgins of the Wildlife Trusts warned that removing BNG from urban brownfield developments risks diminishing urban nature access and weakening climate resilience in communities that need it most.

In response to these issues Paul Smith of Apex Planning Consultants comments: “The objectives of BNG are laudable, hugely important and valuable in ‘greening’ the country, whilst tackling climate change too. Nevertheless, many SME housebuilders, particularly, seeking to redevelop urban brownfield sites cannot provide BNG on site and have been forced to purchase often expensive off-site credits. In addition, the small size of such sites means that they rarely make a meaningful contribution to a community’s access to urban nature, and the off-site credits mean BNG is normally provided in rural locations anyway. As such, there is a strong argument to say that the government’s action is a more pragmatic approach, without removing the overall objective of securing BNG.”

Funding for affordable and social housing

To tackle acute housing shortages, the Chancellor announced an additional £1.5 billion for the Social and Affordable Homes Programme, pushing total funding beyond £40 billion over its 10-year lifetime.

To further aid local councils in replacing homes lost through Right to Buy, the Budget introduced two key financial mechanisms:

• VAT Relief: Sales of land to social housing providers are now VAT-free.
• Preferential Borrowing: Councils gain extended access to discounted public borrowing rates to support direct municipal housebuilding.

This investment aligns with existing momentum; Planning Portal data indicates that 103,841 social and affordable homes were applied for in the 12 months up to September 2026.

Paul Smith added: “This is again an admirable approach and includes encouragement to local authorities to ‘develop’ their own housing sites. The problem is that past professional staff and their knowledge, who previously secured sites, planned and built them, have long since left local government. It is hoped therefore that this money might be used to develop their own sites again by recruiting and paying for appropriately skilled staff and/or external consultants. Over reliance on securing affordable housing from other housing developments is fraught with problems, current data shows the cost of a development (including land, infrastructure, BNG, developer contributions etc) means policy requirements for AH are often unaffordable.”

In a move to provide planning certainty, Healey confirmed that no major alterations will be made to building regulations for the remainder of the current Parliament, outside of essential safety updates.

The government also announced £4.7 billion in backed lending for a new equity loan scheme, Your First Home, which will launch in spring 2027. And a new First Time Buyer ISA will replace the Lifetime ISA, eliminating withdrawal penalties for purchasing properties above traditional cap limits.

With the Planning Portal recording 400,000 net additional homes in the pipeline over the past year, the intent to deliver remains clear. For planning professionals, the focus now shifts to navigating incoming guidance on brownfield definitions and leveraging updated financial structures to convert application pipelines into completed developments.

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