How do I bathroom / kitchen / extension? etc.

Now:

• reroof
  
• rewire
  
• replumb (is this definitely needed?)
  
• new windows (depending on cost, and how many will remain)
  
  

Later:

• garage extension
  
  

Even later:

• internal rearrangement
  
• new heating system
  
• new kitchen
  
  

Even later still:

• bathrooms
  
• new windows (or do these at the beginning if replacing existing ones that will be kept is relatively low cost)