London Borough of Barnet

Building regulations guidelines

Building regulation guidelines

You will find helpful guidance and information on topics such as conservatories and making a Building Regulations application on the Local Authority Building Control (LABC) website.

Barnet guidance on chimney breast removal

Gallows brackets to support chimney breasts are generally acceptable provided that appropriate details are submitted and the site conditions are suitable.

Where we have any concerns about the proposals, we will require calculations to justify or amended details to be provided. For instance:

  • the party wall should be at least 215mm thick
  • the brickwork in the party wall must be in good condition
  • the brickwork of the chimney must be bonded to the party wall
  • if the chimney is in a flank wall then the implications for lateral stability must be taken into account.

In most cases, in a house a chimney breast projects approximately 340mm from the face of the party wall and standard gallows brackets are designed to accommodate this. If a chimney breast extended further than this we would require calculations to justify the proposals and in this case we would expect a beam to be provided. With regard to the maximum dimension of an unsupported corbel, please see BS 5628: Part 3 cl.27.8 which indicates the maximum dimension to be 1/3 the thickness of the wall.

If a chimney breast has been removed in the property that shares the party wall, the use of gallows bracket may not always be suitable and would be subject to an assessment of the party wall by a qualified structural engineer acting for the applicant.

Where works are proposed to be undertaken on the party wall you should have been informed by your neighbour at least 2 months before works are planned to commence.

Adjoining owners can agree with these proposals or reach agreement with the building owner on changes in the way the works are to be carried out, and in their timing.  Where there is no agreement, this Act provides a framework for preventing and resolving disputes in relation to party walls by the appointment of an 'Agreed Surveyor or Surveyors' as defined in The Party Wall etc Act 1996.

Building Control

North London Business Park (NLBP), Oakleigh Road South, London N11 1NP

Tel: 020 8359 4500