Are there any add-on to my existing single graze sliding Windows to reduce noises e.g from our creative concert at the void deck.

And whatbe te usual estimated cost to upgrade single graze sliding window to double graze windows for a 5I HDB with 4 bedroom?

Are there any add-on to my existing single graze sliding Windows to reduce noises e.g from our creative concert at the void deck.

And whatbe te usual estimated cost to upgrade single graze sliding window to double graze windows for a 5I HDB with 4 bedroom?

think add in another set of sliding window is cheeper and has better effect than double graze

You sure its gonna be cheaper?

Yes, fully agree. Double glazing dun work unless the framing is also airtight, which is not possible for sliding window.

Alternatively.. can build those japanese design wooden sliding partition, that acts like a curtain.

think add in another set of sliding window is cheeper and has better effect than double graze