The Building Safety Levy: What Developers Need to Know

At Advantage we work closely with developers, self-builders, and housing providers across the UK to arrange structural warranty insurance. As a new tax on residential development approaches, we’ve put together this guide to help you understand what’s changing and what it means for your projects.

What is the Building Safety Levy?

The Building Safety Levy is a new tax on new residential buildings, due to come into force in October 2026. It was originally legislated for under the 2022 Building Safety Act, following two rounds of public consultation, and its introduction has been delayed by 12 months from the original timeline.

The Levy is designed to raise £3.4 billion from UK home builders to fund building safety-related work. It will be charged before a building is completed and occupied, and it will be collected by local authorities rather than central government.

Levy rates vary by location and are published for each local authority in England, reflecting local house prices. Each area has two rates:

· A brownfield development rate, charged in £ per square metre of gross internal floor area

· A greenfield rate, which is set at twice the brownfield rate per square metre

Because the charge is based on total gross internal area, developments with significant communal space such as apartment blocks with shared lobbies, corridors, or amenity areas will see the Levy applied to that unsaleable space as well as the saleable units.

Who has to pay it?

The Levy is payable by developers of new residential schemes. There are exemptions for:

· Affordable Housing

· Certain other development types, including care homes

How and when is it paid?

Levy liability is tied to the building control process, rather than being a separate administrative step:

1. The local authority issues a Levy Liability Notice once a Building Control Initial Notice has been lodged.

2. If the scheme changes in a way that affects the Levy amount for example, a change in the proportion of Affordable Housing the authority can issue an Update Notice to revise the liability.

3. Payment must be made before the first building control completion certificate is issued for any dwelling on the development.

Timing for schemes already underway

· Building Control Initial Notices lodged from October 2026 onwards will be liable for the Levy.

· Initial Notices submitted before October 2026 get a grace period: they won’t be liable for the Levy for an initial three years, or until construction commences under building control within that three-year window, whichever comes first.

· If a development hasn’t commenced within that three-year period, or if the Initial Notice needs to be re-registered, the Levy charge is triggered.

What this means for your project

For developers, the Levy adds a new fixed cost that needs to be factored into scheme viability and cash flow planning from the outset, particularly since payment falls due at the point of the first completion certificate, which is often a cash-flow-sensitive stage of a project.

If you’re planning a residential development with a completion date on or after October 2026, it’s worth speaking to your finance and planning teams early to understand:

· Which local authority rate applies to your site (and whether it’s brownfield or greenfield)

· How communal areas in your scheme design affect your total chargeable floor area

· Whether any part of your scheme qualifies for an exemption

· How the Levy interacts with other costs already built into your project — including structural warranty cover, which remains a separate requirement from lenders and, in many cases, from building control routes

Where to find official guidance

· MHCLG’s Building Safety Levy Guidance (see Section 3 for advice specifically aimed at developers)

· The Building Safety Levy Regulations 2025

How AHCI can help

Getting the right structural warranty in place is one of the fixed requirements for any residential development, regardless of how the Levy affects your scheme’s viability.

Talk to us 0800 0987 934

This guide is for general information only and does not constitute financial, tax, or legal advice. Levy rates, exemptions, and regulations may be updated by government always check the latest official guidance before making decisions based on this information.