What Building Safety Act gateways are
Gateways are staged building-control approval points for higher-risk buildings in England. They force fire and structural safety evidence into the project at planning, before construction starts, and before occupation — so design intent and as-built reality can be challenged before residents move in.
The procedural rules live primarily in SI 2023/909. Operational GOV.UK guidance on building-control approval for higher-risk buildings explains how applications are made to the Building Safety Regulator. Gateways are not optional milestones or soft design reviews.
Gateways 1, 2 and 3
Gateway 1 — Planning
At the planning application stage for higher-risk buildings, fire-safety information must be considered early. Gateway 1 aligns planning with building-safety expectations before design is locked in.
Typical duty-holders: Client, designers, planning authority interface
Gateway 2 — Pre-construction (hard stop)
Before construction begins, a building-control approval application must be made to the Building Safety Regulator. Construction must not start until Gateway 2 is approved. Evidence, competence, management plans, and golden-thread structure are scrutinised here.
Typical duty-holders: Client, Principal Designer, Principal Contractor
Gateway 3 — Completion (hard stop)
Before occupation, completion evidence must satisfy the regulator. Golden thread handover to the Accountable Person / PAP is part of demonstrating the building is safe to occupy.
Typical duty-holders: Client, Principal Contractor, Principal Designer, incoming AP/PAP
Why Gateways 2 and 3 are hard stops
Gateway 2 is a pre-construction hard stop: building work must not start until the Building Safety Regulator has approved the application. Gateway 3 is a completion hard stop: occupation must not proceed until completion requirements are met. Treating either as a paperwork catch-up creates programme, cost, and enforcement risk.
Clients, Principal Designers, and Principal Contractors need a shared evidence plan months before the submission date — competence records, change control, golden-thread structure, and management arrangements — not a last-week document dump.
Evidence the regulator expects
- Clear design intent for fire and structural safety, with named competence behind decisions
- Controlled documents and change history that survive BSR scrutiny
- Construction and design management arrangements (including CDM interfaces where relevant)
- A golden-thread information structure ready to transfer into occupation
- A portal-day pack: checklist status, correspondence, attestation, and HSE reference capture after filing
Threadsovereign prepares and evidences gateway packs for official BSR / GOV.UK filing. It does not replace HSE portals and never auto-files gateway applications. See also formal handover (s.76) and the golden thread requirements.
Common gateway failures
Regulators and experienced duty-holders repeatedly see the same patterns. Treat these as programme risks, not surprises:
- Starting construction before Gateway 2 approval — a hard-stop breach, not a paperwork lag
- Competence claims without named individuals, review dates, or evidence against PAS frameworks
- Change control sitting in email while the golden thread stays frozen at an old revision
- Gateway 3 packs that omit outstanding risks or AP transfer records for occupation day one
- Assuming a CDE folder dump equals a controlled, auditable submission
Pair this guide with duty-holder competence (PAS 8671–8673) and the BSA guides hub.
From Gateway 3 into occupation
Completion approval is not the end of the story. The Accountable Person / Principal Accountable Person inherits registration, Key Building Information, safety case, occurrence reporting, and resident duties from day one of occupation. Gaps at Gateway 3 become occupied- phase compliance risk immediately.
Continue with Key Building Information, safety case report, and Building Assessment Certificates.
How Threadsovereign covers gateways
Design-phase projects track Gateway 1–3 readiness, controlled documents, risks, tasks, CDM interfaces, competence evidence, and portal-day packs. Soft product path: Gateway 2 submission software · Principal Designer software.
Primary sources
FAQ
Cochise Derrick
Founder & Director
Cochise Derrick is the founder and director of Threadsovereign Ltd and the sole architect and developer of the Threadsovereign platform. With a background as a lead developer on central government digital services and current SC clearance, he brings the technical depth and regulatory understanding required to build compliance infrastructure that duty-holders can genuinely rely on. Threadsovereign is the result of over a year of focused development against the Building Safety Act 2022 and its statutory instruments.
Areas of focus
Implement this in Threadsovereign
Statutory workflows sit on every paid plan. Prepare and evidence in-platform; file on the official BSR portal.