Value add question: A office addition or a new kitchen/floors

[Matthew W.]

Resale in mind 5-6 years out realistically.

We have a limited budget on our primary new "fixer upper" home. The house needs work in many areas from the top down. But I will focus on the main "want to dos":

1) Interior first? the floors and kitchen is currently a 6/10, as to say it is livable and functional. But OMG is it lacking in many areas. The advantage of doing this repair first is a better kitchen to live in day to day and of course future resale value. Cost: $80K.

2) Exterior first? Bedroom office situation: 2/10. The home has 2 bedrooms (1 is upstairs), but lacks an office. We can do an addition which adds 90 sq feet. This would greatly increase space and value as well, but at expense of the kitchen and of course more upfront cost. This is likely $120K. (Also included here is a fix to the exterior I might as well do simultaneously that also fixes a bizarre issue in the master bath). The advantage of this repair first is well, a formal office, more space, and a better master bath.

IN your opinions, what adds more value or makes the most sense?  I paid $600 sq foot for the house, but homes in teh area easily fetch $1000+ in some cases.  So maybe its possible to recoup all the cost back on the addition.   Need opinions on which adds more value and makes more sense.