Part 5 leaseholder protections and remediation

What Part 5 covers

Part 5 of the Building Safety Act addresses remediation and leaseholder protections for relevant buildings. The height and storey thresholds used for Part 5 protection can differ from the higher-risk building definition that drives Part 4 occupied duties — do not assume the regimes are identical.

Landlords and managing agents need accurate qualifying-lease data, contribution calculations under Schedule 8 where they apply, and auditable remediation records for residents, lenders, and the courts.

Caps, defects and remediation orders

• Qualifying-lease registers with named ownership and evidence
• Schedule 8 contribution tracking where caps apply
• Relevant defect and remediation-order workflows with audit trails
• Certificate and landlord documentation packs retained for challenge

Common Part 5 traps

• Applying HRB Part 4 processes to Part 5 buildings without checking thresholds
• Spreadsheet qualifying-lease lists without evidential ownership trails
• Schedule 8 caps calculated inconsistently across a portfolio
• Remediation orders and landlord certificates scattered across email and shared drives
• Residents and lenders unable to obtain a coherent remediation narrative

See also the BSA guides hub for Part 4 occupied pillars.

Keep Part 5 distinct from Part 4

Many portfolios mix Part 4 HRB duties with Part 5 remediation. Use separate processes and evidence trees. Occupied Part 4 pillars include KBI, safety case, and BAC.

Developments to watch (not yet law)

Two further remediation measures are moving through Parliament but are not yet in force. The Leaseholder Remediation (Building Safety) Bill [HL] — a House of Lords private member’s bill — passed second reading on 11 September 2026 and is currently at Committee stage; as a backbench bill it has no guaranteed further parliamentary time. Separately, the Government’s own Building Safety (Remediation of Unsafe Cladding etc) Bill was introduced to the House of Commons on 14 October 2026, proposing a legal duty on building owners to remediate unsafe cladding, First-tier Tribunal enforcement powers (fines of up to £500,000), and step-in powers for third parties where owners fail to act.

Neither Bill currently changes Part 5 duties. Treat both as monitor-only until Royal Assent, and do not rely on either as a basis for current remediation decisions.

How Threadsovereign covers Part 5

Qualifying-lease and remediation tracking sits alongside occupied AP workflows for portfolios that carry both regimes. Soft product path: Accountable Person software · Full platform capabilities.