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
                

Smiley Building Services are endorsed by “Trustmark”, who are the only UK Government
                            Endorsed Quality building Scheme for work carried out around your home.
                            
                            Several motivations fuel TrustMark's mission, chiefly to assist homeowners with
                            implementing energy-saving upgrades in their dwellings and to bolster the level of
                            confidence they possess while engaging in such undertakings. It is imperative to possess a
                            well-defined vision of your intended home improvements, acquaint yourself with the
                            potential expenses and expected duration of projects. Bear in mind that proficient
                            professionals are typically sought after, hence there could be a necessity to be patient in
                            order to secure the services of the ideal tradesperson for your task.