Tea Trade Wharf: Refurbishing a Historic Higher-Risk Building
Why Historic Higher-Risk Building Refurbishment Requires Integrated Design and Compliance
Tea Trade Wharf demonstrates why refurbishment within a historic Higher-Risk Building (HRB) cannot be treated as a conventional internal fit-out. Existing construction, heritage significance, occupied residential use and modern fire-safety obligations must be understood together. Even contained alterations can affect compartmentation, protected routes, structure or building services, making early investigation and a clearly defined regulatory route essential.
For clients and established project teams, the first task is to confirm the extent of building work, the approvals required and the information needed to justify the design. Our Higher-Risk Building consultancy supports this assessment, while the High-Risk Building Hub explains the wider Building Safety Act, Gateway and dutyholder framework.
At Tea Trade Wharf, Folly Architects provided targeted HRB consultancy within an existing project team. The work focused on regulatory triggers, fire-strategy alignment, the implications of design change and the quality of the evidence supporting the proposals. This is closely connected to our Building Regulations service , where coordinated drawings, technical narratives and consultant information are developed as one compliance package rather than separate workstreams.
A Historic Building with Contemporary Safety Obligations
Tea Trade Wharf forms part of the historic warehouse landscape around Shad Thames and Butler’s Wharf. Its character comes from robust masonry, repetitive openings and the retained fabric of an earlier industrial building, subsequently adapted for residential occupation. That history gives the building architectural value, but it also creates uncertainty: original construction may have been altered repeatedly, concealed junctions may differ from record drawings, and later services may pass through compartment lines.
Heritage significance does not remove the requirement to comply with Building Regulations. Equally, a technically compliant proposal should not cause avoidable harm to significant fabric. The design task is therefore to understand what exists, identify where intervention is genuinely necessary and develop details that achieve the required safety outcome with the least damaging alteration. Listed building consent, freeholder approval and building control approval are separate matters and may all influence the programme.
Existing-Building Evidence Comes Before Design Assumptions
Existing HRBs rarely arrive with a complete and perfectly coordinated record. Fire strategies, lease plans, structural information and services drawings may have been produced at different times and to different standards. An architect must distinguish verified information from assumptions, then establish how gaps will be tested through surveys, opening-up or construction-stage inspection.
This is particularly important where work approaches compartment walls or floors, fire doors, protected corridors, risers and service penetrations. A small change to a kitchen, bathroom or ventilation route can create a disproportionate compliance issue if it breaches fire-resisting construction or conflicts with the building-wide fire strategy. The architectural package should show the relationship between proposed work and the existing safety system, not merely the appearance of the finished interior.
Coordinating Fire Safety, Heritage and Buildability
In a historic HRB, the strongest solution is rarely produced by one discipline working alone. The architect, fire engineer, structural engineer, services designers, heritage adviser and contractor need a shared understanding of the existing building and the proposed intervention. Drawings must align with the fire strategy, specifications must identify tested systems and interfaces, and sequencing must allow critical work to be inspected before it is concealed.
Buildability matters because sensitive details can fail if they cannot be installed, accessed or recorded on site. Fire stopping around irregular historic fabric, for example, may require surveyed openings, compatible proprietary systems and clear responsibilities for installation and inspection. Our Design Management service is structured around resolving these interfaces before they become programme or compliance problems.
Gateway 2 and the Existing Higher-Risk Building Route
Where proposed work to an existing HRB is building work and is not solely exempt, competent-person-scheme work or an emergency repair, Building Safety Regulator approval is generally required before work starts. The application must explain how the effect on the existing building has been assessed, present evidence for the design decisions and demonstrate compliance with the functional requirements of the Building Regulations.
The submission route and information requirement must be established accurately for the particular scope. A strong package coordinates architectural, fire, structural and services information with the construction control plan, change control arrangements and dutyholder declarations. Our Gateway 2 application service focuses on making that evidence coherent, traceable and suitable for regulatory review.
For an example of full architectural and Principal Designer leadership in another sensitive central London setting, see Navigating Gateway 2 in Knightsbridge . Tea Trade Wharf illustrates a different but equally valuable model: targeted specialist support that strengthens an established team without confusing formal dutyholder responsibility.
Managing Change and the Golden Thread During Construction
Approval is not the end of the compliance process. Historic fabric often reveals unforeseen conditions once work begins, so the team needs an agreed method for recording discoveries, assessing design consequences and controlling changes before they are implemented. In HRB work, an apparently practical site adjustment may be notifiable or major if it affects the approved compliance strategy.
The Golden Thread should therefore develop throughout design and construction. Updated drawings, product information, inspection records, photographs and decisions need to form a reliable account of what was approved and what was built. This protects the client at completion and provides the building’s accountable parties with usable safety information, rather than an unstructured archive assembled retrospectively.
Frequently asked questions
The following questions and answers summarise common queries relating to this topic.
The RIBA Plan of Work organises a project into eight stages, from Strategic Definition and Preparation and Brief through Concept Design, Spatial Coordination, Technical Design, Manufacturing and Construction, Handover and finally Use. Smaller projects may combine activities, but the underlying sequence remains useful for organising decisions and information.
Planning applications are commonly prepared once the concept has been developed sufficiently to explain the proposed scale, appearance, layout and relationship to the site. The precise timing depends on the project, and planning strategy should be considered from the outset rather than added after the design has been fixed.
Usually not. Planning drawings are primarily prepared to explain the proposal for planning purposes and generally do not contain the level of technical detail needed for Building Regulations, accurate pricing and construction. A coordinated technical design package is normally required before work starts.
Consultants should be appointed early enough for their input to influence the design before key decisions are fixed. A structural engineer is often involved during concept or spatial coordination, while fire, MEP, heritage, energy or other specialists may be required depending on the building and project complexity.
It can, depending on the agreed appointment. Construction-stage services may include technical queries, design changes, site inspections, contractor information reviews and contract administration. Retaining architectural involvement can help maintain coordination between the approved design, technical requirements and what is actually built.
Practical Advice Before Altering a Historic HRB
Clients should avoid fixing the layout, appointing a contractor or committing to a construction date before the building’s status and approval route have been reviewed. Obtain the lease and landlord requirements, available fire and structural information, heritage designation details and records of previous alterations. Define what is known, what requires investigation and which party is responsible for each technical input.
Tea Trade Wharf shows that historic character and contemporary building safety are not competing ambitions when the project is properly led. A measured strategy—grounded in investigation, coordinated design, proportionate intervention and disciplined information management—can protect significant fabric while giving regulators, building managers and residents clear evidence that the work has been designed and delivered responsibly.
Contact us
If you would like to discuss a project, clarify regulatory requirements, or understand how our experience may be relevant to your work, you are welcome to get in touch.
