The Building Safety Levy came into force in England on 1 October 2026. For developers, it is a new project cost. For contractors and their brokers, the less obvious issue is what happens when that cost arrives after project budgets and insurance values have already been set.
The levy is not itself an insured loss. But it can change the cost and financial picture of a residential scheme, and that can leave project information used for insurance out of date. A value declared at the start of a job should not simply be left untouched while costs, scope and delivery plans move on.
What the levy covers
The levy applies to qualifying residential developments that need building control approval: generally, schemes of 10 or more new homes and purpose-built student accommodation developments of 30 or more bedspaces. It is intended to raise £3.4 billion over 10 years to help fund remediation of unsafe buildings.
The charge is calculated per square metre of chargeable floorspace. Rates vary by local authority area, and eligible developments on previously developed land receive a 50% discount. Affordable housing and specified specialist accommodation are among the exemptions, but the detailed rules matter: eligibility depends on the development and the relevant evidence, not just the project’s informal description.
The location-based rates make the impact uneven. On non-previously developed land, 2,000 sq m of chargeable floorspace works out at about £58,000 in Birmingham, around £76,000 in Basingstoke and Deane, and approximately £127,000 in Barnet. At 10,000 sq m, the examples rise to roughly £284,000 in Manchester, £292,000 in Birmingham and £612,000 in Tower Hamlets.
These figures are illustrations, not a substitute for calculating a project’s actual liability. The government guidance on rates and calculations explains chargeable floorspace, local authority rates and the brownfield discount. The introductory guidance sets out the scope, exemptions and application rules.
How an added cost creates an insurance gap
The levy is payable by the developer client where it applies. That does not mean the levy amount should automatically be added to every insurance sum insured. The right treatment depends on the policy wording and the basis on which the value was declared.
The practical concern is that the levy can prompt changes elsewhere. A scheme may be paused, reduced or cancelled. A developer facing tighter margins may seek lower subcontractor prices or longer payment terms. Scope can change, procurement may be revisited, and programmes may stretch. In turn, the original estimate of the work, materials, contract value or project exposure may no longer describe the job that is actually being delivered.
That is why Markel’s UK Head of Construction Underwriting, Greg O’Neill, has warned brokers to check whether the figures underpinning a client’s insurance still reflect the current position. Declared values, he says, should not be a one-off exercise at the start of a project. SME developers can be particularly exposed because they may have less internal capacity to keep cost and insurance information under review.
For contractors, the same discipline matters. A contractor’s project information may have been prepared using an agreed contract sum, planned scope and expected programme. If those assumptions change, the broker needs to know. The levy is a prompt to revisit the numbers, not a reason to assume that every policy value must rise by the levy amount.
Which insurance figures should be reviewed?
Start with the cover that relates directly to the work and the project, then check the policy terms with your broker.
- Contract works and contractors’ all risks (CAR): Confirm what value the policy asks you to declare and what that figure includes. Check whether the contract value, materials, work in progress and any other relevant components have changed. Make sure any adjustments follow the policy’s reporting requirements.
- Reinstatement sums: These are not necessarily the same as a project’s delivery cost or the amount of the levy. Check what the sum insured is intended to cover and whether construction-cost changes, alterations to the building or revised specifications mean it needs a fresh review.
- Professional indemnity: If your business makes design, engineering or specification decisions, assess whether changes to the project or budget affect your professional exposure. The levy itself does not make a design negligent, but decisions made to manage costs should be properly considered, documented and communicated.
- Employers’ liability: The levy does not automatically change the value of this cover. Still, if the project’s scale, workforce, activities or subcontracting arrangements change, make sure your broker has an accurate picture.
- Contractors’ liability: Review the work descriptions, activities and limits shown on your policy, including any assumptions about the types or scale of projects you undertake. General Contractor Liability Insurance needs to reflect the contractor’s actual operations, rather than an outdated description of the business.
This is also a useful moment to revisit common underinsurance mistakes. The central principle is straightforward: the declared figures and risk details should be consistent with the work being carried out and the terms of the policy.
Application dates and project decisions
Applications submitted before 1 October generally sit outside the levy. However, developers should check that a pre-deadline application was properly made: an invalid or rejected application that has to be resubmitted on or after 1 October can still fall within the levy regime. Keep a record of the submission and validation position, and confirm the treatment against the official guidance rather than relying on an informal understanding of the deadline.
The likely commercial effects will vary. Some schemes may be paused, downsized or cancelled, while others may proceed with tighter subcontractor margins or less favourable payment terms. That is not just a developer concern. Contractors should watch for changes to scope, programme, payment milestones and procurement, and tell their broker if those changes alter the risks or values declared.
There may also be opportunities in smaller schemes below the levy threshold and in brownfield development, which benefits from the reduced rate when the criteria are met. Local contractors across Essex, Kent and London may see work shift towards these types of projects. But smaller projects still need suitable cover, and a brownfield discount does not remove the need to verify the site’s status and the project’s insurance basis.
For firms looking for Construction Contractor Insurance, or reviewing Business Insurance Essex and Business Insurance London, the useful step is a practical conversation about the work actually being undertaken. A broker should understand the project, the contract and the business behind it, not just one figure copied forward from an early estimate.
A practical review checklist
When a project is affected by the levy, contractors and developers can use these questions to start a discussion with their broker:
- Is the project in scope, and has the levy been calculated using the correct local authority rate, chargeable floorspace and land status?
- Does an exemption apply, and is the supporting evidence available?
- Was any application submitted before 1 October valid, or might it need to be resubmitted?
- Have the contract sum, scope, materials, programme or subcontracting arrangements changed since insurance values were prepared?
- Do the contract works/CAR declared values and reinstatement sums still match the basis required by the policies?
- Are professional indemnity, employers’ liability and contractors’ liability descriptions still accurate?
- Have the broker and insurer been told about material changes, in line with the policy’s notification requirements?
The levy is a statutory project cost, not a substitute for insurance and not automatically an insured value. Its real insurance significance is the possibility that project assumptions become stale while the job changes around them. Review the figures with your broker, keep the supporting records, and make updates when costs, scope or timing materially move. That is a sensible step for both SME developers and the contractors who deliver their schemes.