Owning your own home

For me, I would

• ignore the conservatory bit
  
• do a cost per square foot on the rest of the house
  
• compare cost square foot against other similar properties, see if I'm paying a premium for the glass
  
• plan to remove the glass, rear wall and do a proper extension with BC and PP and all that stuff like next door
  
• expect to find other horrors and try to price that in
  
• offer based on the costs / hassle of the above
  
• plan for short term: re-instate the doors for security / efficiency