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Please let me know your thought on this,

I have the option of fitting Window grill either on the outside or inside of windows as I am planning to go for sliding window (grill will be fixed to the wall and then wall will be plastered)
Most of the houses I have seen have grill fixed on the inside, very few of them have grill fixed on the outside

I am thinking of placing grill outside for following reason
1) I can have the grill fixed now, complete the wall plastering, later Window vendor can fix the window from inside without the need getting him scaffolding arrangement (which will cost me)
2) repair and maintenance (like replacing broken glass) can be done easily from inside in future
3) easy to operate the window

Disadvantage is that,
Looks
Grill will be exposed to elements and would require bit more maintenance
Each time new guest visit to home will have question on this setup

check out the UPVC windows thread and you will see a lot of discussion on the grill side.
My thoughts are that - grill on inside is more advantageous (will gather less dust, will be easy to clean it from inside, also leakage etc. are lower if you use the premade windows).

thanks @blrsiteseeker