Development lender LendInvest and construction monitoring consultancy MDA Consulting have published a joint whitepaper on the Building Safety Levy, which becomes mandatory in England on 1 October 2026.
Titled Building Safety Levy: Implications for Lenders & Monitoring Surveyors, the paper covers regional rate structures, gross internal area calculations, brownfield discount criteria and transitional exemption windows for developers, lenders and monitoring surveyors.
The levy comes into force under Section 58 of the Building Safety Act 2022 and the Building Safety Levy (England) Regulations 2025, and the government designed it to raise about £3.4bn over ten years to remediate legacy building safety defects. LendInvest describes it as one of the biggest shifts in UK development finance and site appraisal mechanics in recent years.
Building Safety Levy scope reaches low- and mid-rise schemes
The levy applies to all major residential developments in England with 10 or more dwellings, or 30 or more purpose-built student accommodation bedspaces. The whitepaper addresses a widespread misconception here, because the charge applies regardless of building height and catches low- and mid-rise schemes alongside high-rise developments.
Charges vary by local authority
Local authority charges follow regional property valuations, from £12.70/m² in County Durham to £100.35/m² in the Royal Borough of Kensington & Chelsea. Schemes built on previously developed land can qualify for a 50% rate reduction, provided at least 75% of the consented site meets the statutory definition. The paper highlights the verification and evidence gathering needed to secure that discount safely at underwriting.
Payment timing and transitional rules
Developers pay the levy as a single upfront cost before the first completion or occupation certificate is issued. If a scheme fails to budget or fund it accurately, building control authorities will withhold completion certificates, which blocks unit sales, refinancing and loan redemptions. Applications submitted to building control before 1 October 2026 are exempt, provided works substantively begin on site within three years of the initial application.
"As property development lenders, our role extends beyond providing capital; it's about offering certainty as developers navigate major regulatory shifts like the Building Safety Levy," said Dan Lohn, relationship manager at LendInvest (pictured).
"With the Levy directly impacting scheme viability, cash flow timing and completion sign-offs, proactive partnerships are essential. By joining forces with MDA Consulting, LendInvest is delivering practical clarity on complex calculations, brownfield exemptions and adapted funding structures to help SME developers manage these obligations and keep projects moving forward securely."
"Where much of the post-Grenfell reform agenda is procedural, the Building Safety Levy is a direct cash cost sitting on every qualifying scheme's balance sheet," said Chris Chadwick, director at MDA Consulting.
"Calculated on measured floorspace and varying by local authority, its mechanics demand disciplined, stage-by-stage verification so costs are not overlooked.
"In collaboration with LendInvest, MDA is sharing practical guidance to help lenders, developers, and surveyors successfully manage this shared financial risk from initial appraisal right through to final completion certification."
