From 1 October 2026, a new charge comes into force for residential developers: the Building Safety Levy (BSL). It’s a UK Government measure to help fund the remediation of unsafe residential buildings, and it will affect how projects are costed and programmed from the outset.
Here’s what’s changing, and what you need to have in place.
Who the levy applies to
The BSL applies to:
New residential developments of 10 or more dwellings
Purpose-Built Student Accommodation (PBSA) schemes with more than 30 bedspaces
Some developments are exempt, including affordable housing, NHS hospitals and a small number of other specified categories.
How it’s calculated
The levy is based on the Gross Internal Area (GIA) of qualifying residential floor space, including communal areas, and is charged per square metre.
Rates are set by individual local authorities to reflect local property values, so there’s no single national figure. As a guide, the average undiscounted rate is around £33 per m², rising to roughly £100 per m² in the highest-value London boroughs.
A 50% discount is available for developments on brownfield land, provided at least 75% of the site within the red line boundary is previously developed.
How it’s collected
Liability is tied to the Building Control process rather than sitting separately. Developers submit floor area and other relevant information at the commencement of works, and the local authority calculates the amount due within five weeks. This is confirmed in a Levy Liability Notice.
The levy must be paid in full before the first Completion Certificate is released for any dwelling (or the Final Certificate, for buildings over 18m). In practice, this means occupation can’t proceed until the levy is settled — so it needs to be factored into your programme, not left as a late-stage administrative step.
Timing and transitional arrangements
The key date is 1 October 2026. Any Building Control Initial Notice submitted on or after that date will be subject to the levy.
If your Initial Notice is submitted before 1 October 2026, you’ll benefit from a three-year transitional exemption, provided construction commences within that period.
What this means for your project
For anything approaching the 10-dwelling or 30-bedspace threshold, the BSL is now a cost line that needs to sit in your feasibility and budgeting from the start — not something to work out once works are underway. Timing your Initial Notice, understanding your local authority’s rate, and checking whether the brownfield discount applies could all have a meaningful effect on the final figure.
If you’d like to talk through how the levy applies to a specific project, get in touch — we’re happy to help you work through it.
The Building Safety Levy:
What developers need to know before October 2026
From 1 October 2026, a new charge comes into force for residential developers: the Building Safety Levy (BSL). It’s a UK Government measure to help fund the remediation of unsafe residential buildings, and it will affect how projects are costed and programmed from the outset.
Here’s what’s changing, and what you need to have in place.
Who the levy applies to
The BSL applies to:
Some developments are exempt, including affordable housing, NHS hospitals and a small number of other specified categories.
How it’s calculated
The levy is based on the Gross Internal Area (GIA) of qualifying residential floor space, including communal areas, and is charged per square metre.
Rates are set by individual local authorities to reflect local property values, so there’s no single national figure. As a guide, the average undiscounted rate is around £33 per m², rising to roughly £100 per m² in the highest-value London boroughs.
A 50% discount is available for developments on brownfield land, provided at least 75% of the site within the red line boundary is previously developed.
How it’s collected
Liability is tied to the Building Control process rather than sitting separately. Developers submit floor area and other relevant information at the commencement of works, and the local authority calculates the amount due within five weeks. This is confirmed in a Levy Liability Notice.
The levy must be paid in full before the first Completion Certificate is released for any dwelling (or the Final Certificate, for buildings over 18m). In practice, this means occupation can’t proceed until the levy is settled — so it needs to be factored into your programme, not left as a late-stage administrative step.
Timing and transitional arrangements
The key date is 1 October 2026. Any Building Control Initial Notice submitted on or after that date will be subject to the levy.
If your Initial Notice is submitted before 1 October 2026, you’ll benefit from a three-year transitional exemption, provided construction commences within that period.
What this means for your project
For anything approaching the 10-dwelling or 30-bedspace threshold, the BSL is now a cost line that needs to sit in your feasibility and budgeting from the start — not something to work out once works are underway. Timing your Initial Notice, understanding your local authority’s rate, and checking whether the brownfield discount applies could all have a meaningful effect on the final figure.
If you’d like to talk through how the levy applies to a specific project, get in touch — we’re happy to help you work through it.
Full guidance from the government is available here: gov.uk/guidance/building-safety-levy-guidance
Recent Posts