The two main types of party walls are:
Smiley building and construction Ltd. are able to offer all of their clients advice on the most straightforward way to obtain a party wall agreement. If you need help liaising with your neighbours our party wall surveyors will be able to negotiate on your behalf and usually obtain the party wall agreement within two weeks or less.
https://www.realhomesmagazine.co.uk/advice/party-wall-agreements-know-the-rules/
https://www.gov.uk/guidance/party-wall-etc-act-1996-guidance
http://hoa.org.uk/advice/guides-for-homeowners/i-am-improving/party-wall-agreement/
http://www.mypropertyguide.co.uk/articles/display/10084/do-i-need-a-party-wall-award.htmhttp://www.mypropertyguide.co.uk/articles/display/10084/do-i-need-a-party-wall-award.htm