How to get it right: working on or around a party wall

It’s now 20 years since the Party Wall etc. Act came into force on 1 July 1997. It applies throughout England and Wales and provides a framework for preventing or resolving disputes in relation to party walls, party structures, boundary walls and excavations near neighbouring buildings.

Anyone intending to carry out work (anywhere in England and Wales) of the kinds described in the Act must give adjoining owners notice of their intentions.

So after 20 years are we now getting party wall works right?

It’s often helpful in understanding the principles of the Act if owners think of themselves as joint owners of the whole of a party wall rather than the sole owner of half or part of it. Some works may be too minor to need a notice under the Act, such as:

  • drilling into a party wall to fix plugs and screws for ordinary wall units or shelving
  • cutting into a party wall to add or replace recessed electric wiring and sockets
  • removing old plaster and replastering

However, the following works all fall under sections 2 and 6 of the Act:

  • Repair of a party wall
  • Inserting a damp proof course
  • Underpinning the whole thickness of a party wall (e.g. to prevent settlement)
  • Cutting into a party wall to take the bearing of a beam (e.g. for a loft conversion)
  • Raising the height of a party wall (e.g. adding another storey)
  • Extending a party wall downwards (e.g. to form a basement)
  • Demolishing and rebuilding a party wall (e.g. if it is structurally defective)
  • Underpinning the whole thickness of a party wall (e.g. to form a basement)
  • Cutting off projections from a party wall (or from an adjoining owner’s boundary or external wall) and if necessary building a new wall adjacent (e.g. removing a chimney breast)
  • Building up against or astride across the boundary line with a new building
  • Excavating, or excavating for and constructing foundations for a new building or structure, within three metres of any part of a neighbouring owner's building or structure, where any part of that work will go deeper than the neighbour's foundations
  • Excavating, or excavating for and constructing foundations for a new building or structure within six metres of any part of a neighbouring owner's building or structure, where any part of that work will meet a line drawn downwards at 45° in the direction of the excavation from the bottom of the neighbour's foundations

Party wall works timeline

A notice of intended works should be served on adjoining owners at least two months before the planned start date for work to an existing party wall or one month for a new party wall. The owner in the adjoining property may agree to allow works to start earlier but is not obliged to, even when agreement on the works is reached.

NB, the notice is only valid for a year, so don’t serve it too long before you want to start.

Adjoining owners can agree with the building owner's proposals or reach agreement with the building owner on changes in the way the works are to be carried out. This can cover things like safety or structural concerns, working times, right of access and replacement of surfaces and finishes.

Party wall disputes

Where a dispute arises in relation to...

  • a new party wall
  • party fence wall
  • where there is no written consent by the adjoining owner within fourteen days to a notice served in relation to an existing structure or an excavation

...the Act provides for the matter to be resolved by a surveyor, or surveyors, in a procedure for the resolution of disputes. This can be both costly and time consuming so it’s always best to have everything resolved well in advance of commencing work. This will often include talking to neighbours to ensure they understand what work is involved and provide reassurance around anything of concern to agree a method of work.

To coincide with the 20th anniversary, Pyramus and This) have published a third edition of their guidebook “The Party Wall Act Explained”.  

This professional surveyor organisation was set up in 1974 and played a pivotal role in the framing of the present Party Wall etc. Act 1996.

Further information

The DCLG Party Wall Explanatory Booklet

The Party Wall etc Act 1996 Explained - Pyramus and Thisbe Club

For more building control and building regulations information go to


Please Note: Every care was taken to ensure the information in this article was correct at the time of publication. Any written guidance provided does not replace the reader’s professional judgement and any construction project should comply with the relevant Building Regulations or applicable technical standards. However, for the most up to date LABC Warranty technical guidance please refer to your Risk Management Surveyor and the latest version of the LABC Warranty technical manual.


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