Gateway 2 Explained: What Architects and Principal Contractors Need to Know Before Submission
Gateway 2 is one of the most significant changes introduced under the Building Safety Act, fundamentally changing how higher-risk buildings progress from design into construction.
Unlike previous approval processes, Gateway 2 is not simply another stage in planning. It is a mandatory approval process managed by the Building Safety Regulator (BSR), and construction cannot begin until approval has been granted.
For architects, principal designers, principal contractors and developers, understanding what the Building Safety Regulator expects is essential to keeping projects on programme and avoiding costly delays.
In this guide, we explain what Gateway 2 involves, what information the BSR is looking for, and how early preparation can help your project progress more efficiently.
What Is Gateway 2?
Gateway 2 is the pre-construction approval stage for Higher-Risk Buildings (HRBs) under the Building Safety Act 2022.
It applies to buildings that fall within the Higher-Risk Building regime and requires developers to obtain approval from the Building Safety Regulator before construction work begins.
Unlike the previous Building Control approval process, Gateway 2 places greater emphasis on demonstrating that building safety has been fully considered throughout the design.
The Building Safety Regulator will assess whether the proposed design complies with the Building Regulations and whether sufficient evidence has been provided to demonstrate that safety risks have been identified and managed appropriately.
Until approval is granted, construction work on the higher-risk building cannot legally commence.
Why Was Gateway 2 Introduced?
Gateway 2 forms part of wider reforms introduced following the Grenfell Tower Inquiry to improve building safety standards across England.
The objective is to ensure that higher-risk buildings are designed and constructed using robust safety processes, supported by accurate documentation and clear accountability.
Rather than identifying issues during construction, the Gateway 2 process encourages project teams to resolve potential problems before work starts on site.
This helps improve design quality, reduce future risks and create a stronger record of decisions throughout the project.
What Is the Building Safety Regulator Looking For?
When reviewing a Gateway 2 submission, the Building Safety Regulator is looking for clear evidence that the proposed building has been designed safely and that appropriate processes have been followed.
While every project is different, submissions generally need to demonstrate:
- Compliance with Building Regulations
- Evidence that safety-critical elements have been properly assessed
- Coordination between the design team and duty holders
- A robust approach to managing building safety risks
- Accurate, current and traceable design information
- A well-maintained Golden Thread of information
The emphasis is not simply on providing documents, but on demonstrating that the project team understands how building safety has influenced design decisions throughout the development.
What Information Is Typically Required?
Gateway 2 submissions can involve a significant amount of technical information.
Although the exact requirements will vary depending on the project, documentation often includes:
Design Reviews – Evidence that the design has been reviewed in line with the responsibilities of the Principal Designer and other duty holders.
Fire and Building Safety Information – Supporting information explaining how fire safety and other building safety risks have been considered throughout the design.
Work at Height Compliance Information – Where rooftop access or maintenance activities form part of the building’s lifecycle, suitable work at height strategies should be included.
This may cover:
- Roof access arrangements
- Fall protection systems
- Maintenance access routes
- Façade access provisions
- Safe inspection procedures
Providing this information early helps demonstrate that future maintenance has been considered as part of the building’s design.
Up-to-Date Drawings – Drawings should accurately reflect the current design and include any revisions made during the design process.
Outdated drawings remain one of the most common causes of Gateway 2 queries.
Golden Thread Information – The Golden Thread is a digital record containing key information about the building throughout its lifecycle.
The Building Safety Regulator expects this information to be:
- Accurate
- Current
- Easily accessible
- Properly organised
- Traceable throughout the project
Maintaining the Golden Thread throughout design significantly reduces the likelihood of delays later in the approval process.
Where Gateway 2 Submissions Often Encounter Problems
Many Gateway 2 delays are not caused by poor design.
Instead, they are usually the result of incomplete or inconsistent information submitted alongside the application.
Some of the most common issues include:
Incomplete Documentation – Missing reports, calculations or supporting information can result in requests for further information from the Building Safety Regulator.
Design Information That Doesn’t Match – If drawings, specifications and supporting documents do not align, the regulator may require clarification before approval can be granted.
Even relatively small discrepancies can generate additional queries.
Generic Method Statements – Project documentation should reflect the specific building rather than relying on standard or generic templates.
Tailored information provides greater confidence that the risks have been properly assessed.
Poorly Managed Golden Thread Information – Where documentation is incomplete or difficult to navigate, reviewing the submission becomes more challenging.
Maintaining organised project information from the outset can significantly improve the efficiency of the approval process.
The Impact of Building Safety Regulator Queries
When the Building Safety Regulator raises comments during the Gateway 2 process, project teams often have limited time to respond.
Queries may require:
- Additional technical information
- Updated drawings
- Clarification of design decisions
- Revised documentation
Depending on the nature of the comment, responses are often expected within short timescales.
If significant issues are identified, the submission may need to be revised before being resubmitted, potentially affecting construction programmes and project costs.
Preparing thoroughly before submission is therefore one of the most effective ways to reduce unnecessary delays.
Why Independent Design Reviews Add Value
One of the most effective ways to improve the quality of a Gateway 2 submission is to carry out an independent review before it is submitted.
An experienced external team can often identify:
- Missing information
- Design coordination issues
- Inconsistencies between drawings
- Gaps in safety documentation
- Areas likely to generate Building Safety Regulator queries
Addressing these issues early is typically far more efficient than responding to regulator comments later in the approval process.
How Heightsafe Supports Gateway 2 Projects
At Heightsafe, we work alongside architects, principal contractors, developers and design teams to help ensure rooftop safety and work at height considerations are fully integrated into Gateway 2 submissions.
Our support can include:
- Reviewing roof access strategies
- Assessing work at height compliance
- Developing safe maintenance access solutions
- Designing fall protection and façade access systems
- Supporting Golden Thread documentation relating to rooftop safety
- Attending coordination meetings where required
- Assisting with Building Safety Regulator queries relating to work at height systems
By becoming involved early in the design process, we help project teams identify potential issues before submission, reducing the risk of avoidable delays.
Preparing for a Successful Gateway 2 Submission
Gateway 2 represents a significant change in how higher-risk buildings are approved before construction begins.
Success depends on more than technical compliance alone. It requires clear coordination, accurate documentation and a well-managed design process supported by robust evidence.
Projects that prepare thoroughly, maintain accurate information and address potential issues early are generally better positioned to progress smoothly through the Building Safety Regulator’s review process.
Speak to Heightsafe About Your Gateway 2 Project
If you’re preparing a Gateway 2 submission and need support with roof access, façade access or work at height compliance, Heightsafe can help.
Our experienced team works with architects, principal contractors and developers to provide practical advice, design support and specialist expertise throughout the Gateway 2 process.
Contact Heightsafe today to discuss your project and find out how we can support your Gateway 2 submission.