The Building Safety Levy came into force in England on 1 October 2026, introducing an additional cost for many residential developments. For property developers, investors and construction businesses, understanding the levy provides useful context when considering development costs, project budgets and investment decisions.
The levy has been introduced to help fund the remediation of building safety defects across England. With development viability influenced by construction costs, financing expenses and planning obligations, it represents another factor in the financial landscape for residential development.
Which developments could be affected?
The levy generally applies to qualifying major residential developments, including:
- Residential developments: schemes involving 10 or more new dwellings.
- Purpose-built student accommodation (PBSA): developments providing 30 or more new bedspaces.
- Certain conversions and changes of use: projects that create new residential accommodation, subject to the relevant charging conditions.
The rules vary depending on the nature of the development and how it is delivered. Developers will need to assess each scheme individually to establish whether the levy applies and what the potential liability could be.
How is the Building Safety levy calculated?
The Building safety levy is calculated by reference to chargeable residential floorspace and the applicable rate for the local authority area. Rates vary across England, meaning the location of a development can influence the overall cost.
A reduced rate, set at half the standard rate, applies to qualifying developments on previously developed land, commonly known as brownfield sites. Eligibility depends on the statutory definition and the proportion of the wider development site that qualifies.
Certain permitted development conversions are also subject to specific provisions.
These factors can influence the overall levy payable, particularly in relation to phased developments, mixed-use buildings and schemes combining residential and non-residential accommodation. The applicable rate, chargeable floorspace and eligibility for any reductions are relevant considerations when assessing the costs associated with a development.
Are any developments exempt?
Certain developments and organisations are exempt from the levy. These include qualifying affordable and social housing, specified supported housing and certain other types of accommodation, such as care homes, hospitals and hotels.
Exemptions are subject to specific conditions, and eligibility can depend on both the nature of the development and the organisation delivering it. For example, a joint venture involving a social housing provider will not automatically qualify for the same exemption as a development delivered entirely by an eligible organisation.
The relevant statutory conditions determine whether an exemption applies, with the circumstances of the development and the parties involved influencing the position.
What about projects already in the pipeline?
The Building Safety Levy applies to qualifying building control applications and notices submitted on or after 1 October 2026. Applications submitted before this date are generally outside the regime, even if subsequently varied, although the relevant transitional provisions should be checked.
An important exception is where an application submitted before 1 October 2026 is rejected and then resubmitted after that date – in these circumstances, the development may become liable for the levy.
The timing and status of a project’s building control application are therefore relevant factors in determining whether the levy applies. This is particularly pertinent to developments that were already progressing through the planning, pre-construction or building control stages when the levy came into force.
What does the Building Safety Levy mean for development costs and viability?
The levy represents an additional development cost that could affect project margins, funding requirements and investment returns. Schemes with limited contingency or tight profit margins may be particularly exposed, while the location of a site, its chargeable floorspace and eligibility for any reductions or exemptions will influence the overall liability.
Payment must be made through the relevant building control process before the applicable completion or occupation milestone and failure to resolve the liability could therefore create practical difficulties towards the end of a project.
The levy may also be relevant to development agreements and joint venture arrangements, particularly where responsibility for project costs is shared between different parties. Its potential impact on development appraisals, contractual arrangements and funding requirements will vary according to the structure and financial circumstances of each scheme.
What does this mean for developers?
The introduction of the Building Safety Levy adds another consideration to the financial planning of qualifying residential developments. Its impact will depend on factors including the type and location of the development, the amount of chargeable floorspace, the applicable rate and whether any exemptions or reductions apply.
For projects already in progress, the relevant application dates and transitional provisions are also important in determining whether the levy falls within the scope of the new regime.
As a result, the financial implications are likely to differ between developments, depending on their individual characteristics and circumstances.
How Cowgills supports the property sector
The introduction of the Building Safety Levy adds another consideration to the financial landscape for residential development, with potential implications for project costs, cash flow, funding requirements and investment returns.
At Cowgills, we work with businesses across the property and construction sectors, providing financial insight to support business planning, funding decisions and an understanding of financial performance. In an environment where costs and regulatory requirements continue to evolve, understanding the wider financial position of a business is increasingly important.
From cash-flow forecasting and funding considerations to financial reporting and wider business planning, having a clear picture of financial performance can support informed commercial decision-making and help businesses navigate an evolving development environment.
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