I'm reading this as a question about the wording of the agenda item and process to be followed if the majority of councillors do not agree with the recommendations of the working party which was set up to review the plans for the extension. If I've understood the question correctly, whilst the motion refers to approving the recommendations, there is still an option to table an amendment (see your standing orders for the process to follow). So, for example, you could table an amendment for approving the recommendations "subject to the following amendments ...........". Or, you could resolve to defer a decision and refer the working party back for further discussions.
Clearly the devil here is in the detail of what the working party has been asked to do and why.