In article , Dg
wrote:
And the PWA is not legally enforceable, with no penalties if
you choose not to follow it.

If you have already started then you may as well carry on
without it. If you send out the notices, then you will have to
stop work and wait for the replies, and if a dispute arises
then you will be paying all the surveyors fees.

But AIUI if you are start work without the requisite notice the
adjoining owner can apply for an injunction and costs will be
awarded against you. IANAL

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