Party wall agreement is what most people call the outcome of the notice procedure, whether that outcome is written consent or a surveyors' award. The distinction matters because one is free and immediate and the other takes weeks and costs money. Everything in the process is aimed at reaching the first, and the Act exists so that failing to reach it does not stop the work.
When one is needed
Whenever notifiable work is proposed and an adjoining owner does not consent in writing. If they consent, there is no award and nothing further to do beyond keeping the consent safe. If they dissent or stay silent, surveyors are appointed and an award follows.
How long the process takes
Allow the notice period first, then time for appointments, an inspection of the adjoining property, and the drafting and service of the award. In an uncomplicated case that is a matter of weeks after the notice period; a contested case with three surveyors takes longer, and a basement usually takes longest.
How long the agreement lasts
An award authorises the works it describes, and the Act contemplates that the works begin within twelve months of the notice. Work that has not started by then generally needs the notice serving again, and work that changes materially needs an addendum award.
What the award contains
The works authorised, the way they are to be carried out, the hours, the access arrangements, the schedule of condition, the surveyors' fees and the mechanism for dealing with damage. It binds both owners and their successors, and it is appealable to the county court within fourteen days.
Questions people ask about party wall agreements
Do I need a party wall agreement for an extension?
Only if the extension involves notifiable work: cutting into or building off the party wall, building at the boundary, or excavating within the section 6 distances. Many single storey extensions do all three.
Can I start work while waiting for the agreement?
Not on the notifiable elements. Work that has nothing to do with the party structure or the excavation can proceed, but starting the notified works before an award is in place exposes the building owner to an injunction.
What if my neighbour just agrees verbally?
The Act asks for consent in writing. A verbal agreement leaves you with no record if the neighbour changes their mind or sells, and the next owner is not bound by a conversation.