You mentioned stone benchtops - simple does not equal cheap.
Is it brick? P/B & Timber stud? Wattle & Daub? Mud Brick? Gold plated titanium? What is above it? How much is being cut out? Does the roof require resupporting? What about the floor?
How deep are your pockets?
Do you plan to diy or engage a builder?
Over what time frame?
Kitchen - $5k-$50k
Bathroom: $8k - $25k
Flooring: $35-$150/m2
Verandah: $5k - $35k
All depending upon the scope and inversely proportional to depth of your pockets/ length of your arms ^2
