A new charge lands on most residential development in England from 1 October 2026. The Building Safety Levy is not corporation tax, VAT or SDLT — it is a standalone charge collected through the building control system, calculated on floorspace rather than profit, and due whether the scheme makes money or not. With the launch date now inside most developers' current pipeline, it is worth understanding exactly how it lands before it does.
What the levy actually is
The Building Safety Levy is a new charge on residential development in England, introduced to help fund the remediation of unsafe cladding and other building safety defects on existing buildings. Government estimates put the target at around £3.4 billion raised from developers over the following decade. It sits alongside, not instead of, the existing Building Safety Act regime and the Residential Property Developer Tax that already applies to larger developers' profits.
Unlike RPDT, which is a tax on profit, the levy is charged on floorspace, which means it is due on a scheme regardless of whether that scheme is profitable, marginal, or loss-making. That is a meaningful shift in how a project's costs need to be modelled.
How the charge is calculated
The levy is charged per square metre of gross internal floorspace on the residential element of a chargeable development, measured under the RICS Code of Measuring Practice (6th edition). The rate per square metre is not a single national figure — it is set separately for each local authority area, weighted by average local house prices, so the levy costs considerably more to build in an expensive area than a cheaper one.
The published range runs from around £12.70 per square metre at the lowest end to over £100 per square metre in the highest-value local authorities. Where a scheme sits in that range depends entirely on which local authority it falls in, so the first practical step for any developer is checking the specific rate set for the site's location in the government's published schedule, rather than assuming a North West average. Rates are not indexed annually; they are reviewed every three years through new regulations, so once you know the applicable rate it should hold for a while.
A 50% discount applies where the development is on previously developed (brownfield) land, which will be relevant to a large share of infill and regeneration schemes across Merseyside and Greater Manchester.
Who is exempt
Two categories fall outside the charge entirely:
- Small sites. Developments of 10 residential units or fewer are exempt, as is purpose-built student accommodation with fewer than 30 bedspaces. This is intended to protect the viability of smaller infill and self-build schemes.
- Qualifying affordable housing. A narrower exemption than the National Planning Policy Framework definition — broadly, social rented, affordable rented and intermediate housing secured by a planning obligation to be let for no more than 80% of market rent, or sold for no more than 70% of market value. Starter homes, discounted market sale and other affordable routes to ownership outside that definition do not qualify.
Everything else in scope — market sale, build to rent, and mixed-tenure schemes above the small sites threshold — pays the levy on the chargeable floorspace, net of any exempt affordable element.
When it is charged, and why the date matters now
The levy is collected through the building control gateway process, not at planning permission or at practical completion. Broadly, it attaches to a development at the point a full plans application, an initial notice, or a Gateway 2 application is submitted to building control.
Crucially, developments that have already made one of those applications before the levy launches on 1 October 2026 are not caught by the charge, even if the build itself continues well past that date. For a developer with a scheme approaching the building control stage over the next few months, the practical question is timing: bringing a building control application forward to land before launch removes the levy from that scheme's cost base entirely. For schemes that will inevitably apply after October, the levy needs to go into the appraisal now, not once the invoice arrives.
What this means for appraisal and viability
Because the levy is charged on floorspace rather than profit, it behaves more like a fixed development cost than a tax — closer to a Section 106 contribution or CIL than to corporation tax. On a tight-margin scheme, particularly one already carrying a CIL liability and Section 106 obligations, an additional floorspace-based charge in the tens of thousands of pounds can be the difference between a viable and a marginal appraisal. Developers running live feasibility studies for schemes likely to reach building control after October 2026 should be building the applicable local authority rate into the numbers now, alongside the brownfield discount where it applies, rather than treating it as a late addition once the building control application goes in.
Common questions
When does the Building Safety Levy start?
The Building Safety Levy comes into operation on 1 October 2026 in England. Developments that submitted a full plans application, an initial notice, or a Gateway 2 application to building control before that date are not subject to the levy, even if construction itself continues after launch.
How is the Building Safety Levy calculated?
The levy is charged per square metre of gross internal floorspace on the residential element of a chargeable development, measured under the RICS Code of Measuring Practice. The rate per square metre is set by the government for each local authority area, weighted by average local house prices, and ranges from around £12.70 to over £100 depending on location. A 50% discount applies where the development is on previously developed (brownfield) land.
Is my development exempt from the Building Safety Levy?
Developments of 10 residential units or fewer are exempt, as is purpose-built student accommodation with fewer than 30 bedspaces. A narrower affordable housing exemption also applies to social rented, affordable rented and qualifying intermediate housing let at no more than 80% of market rent or sold at no more than 70% of market value. Starter homes and other discounted market sale products do not qualify for the affordable housing exemption.
Can I avoid the Building Safety Levy by applying before October 2026?
Yes, in principle. Because the levy is triggered by the building control gateway (a full plans application, an initial notice, or a Gateway 2 application), a scheme that has that application in before the levy launches on 1 October 2026 falls outside the charge entirely, even though the levy itself is not paid until later in the build process. Developers with schemes close to the building control stage may want to bring that application forward rather than let it fall after launch.
Kieran Holsgrove is a Director and Co-Founder of Grafene Accounting, the property tax specialist firm based in Liverpool. He advises property developers, investors and landlords across Merseyside, Greater Manchester, Lancashire and Cheshire on tax structuring, developer VAT, SDLT and the long-view decisions that compound over the life of a portfolio.
This article is general information, not personal tax advice, and tax and levy rules change. Your own position depends on facts we cannot see from here — please take advice before acting on anything above.