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External Wall System (EWS1) process

The EWS1 process, and resulting form, is a standardised way for a building owner to confirm that an external wall system (cladding/balconies) on multi-occupied residential buildings has been assessed for fire safety by a suitable expert.

Valuers will request the form if there are specific concerns with the materials used, in line with the latest RICS guidance. 

An EWS1 form must be signed by an appropriately qualified individual following a full fire safety review. 

EWS1 Form: Option A

TSB will accept full members (not a graduate or affiliate) of one of the following professional bodies completing Option A of the form:

  • Architects Registration Board (ARB)
  • Association of Consultant Approved Inspectors (ACAI)
  • Chartered Association of Building Engineers (CABE)
  • Chartered Institute of Architectural Technologists (CIAT)
  • Chartered Institute of Building (CIOB)
  • Chartered Institution of Building Services Engineers (CIBSE)
  • Construction Industry Council Approved Inspectors Register (CICAIR)
  • Institute of Clerks of Works and Construction Inspectorate (ICWCI)
  • Institution of Civil Engineers (ICE)
  • Institution of Fire Engineers (IFE)
  • Institute of Fire Safety Managers (IFSM)
  • Institution of Structural Engineers (IStructE)
  • Local Authority Building Control (LABC)
  • Royal Institute of British Architects (RIBA)
  • Royal Institution of Chartered Surveyors (RICS)
  • Society of Façade Engineers (SFE)

EWS1 Form: Option B

TSB will accept the form with Option B completed by an individual that is a Chartered or Incorporated Engineer (CEng or IEng) with full membership with the IFE (MIFireE or FIFireE).

For buildings where the finished floor level of the top floor of the building (excluding stories consisting exclusively of plant rooms) is less than 18m above the lowest adjacent ground level, if not an IFE member as noted above, TSB can accept an Option B completed EWS1 signed by a qualified member of an eligible professional body who has successfully completed the RICS EWS Assessment Training Programme.

New build blocks

If an EWS1 form is requested for a flat/apartment in a new build block we can issue a mortgage offer, on the understanding an acceptable EWS1 form confirming an acceptable outcome is sent to us prior to completion.

Acceptable outcomes

Following validation checks, TSB will accept EWS1 forms with the following outcomes:

  • A1
  • A2
  • B1

Imminent remediation works

If the remedial works to make a block safe have been planned, funded and are due to commence within the next 6 months we may be able to proceed to offer, provided written commitment can be provided.

For us to proceed under these circumstances we require a letter from the developer/building manager which confirms:

  • The block/building details & address
  • That remediation has been costed and the necessary funding is in place
  • The start date of repairs 
  • The end date of repairs