I never understand why you would have big expensive windows only to cover them up during the day with sheers. But my daughter does in her bedroom as she never looks out window so doesn’t appreciate the big window
A bedroom should have blockout for sleeping. Use of shutters will depend on how the windows operate. Best to get an interior designer to advise on your situation

Which direction do the windows face. If west then you will need blockout curtains during the day to keep the rooms from heating up. If facing south, you will need blockout to keep the cold from the window. If north then Plantation shutters, or sheers with curtains. If east then plantation shutters, or sheers with curtains.

I drive past a lovely modern house today with black windows and white plantation shutters. Both lovely items but together they looked like a lack of planning as from the outside it was a total mismatch.

Bigreader, you are correct. Looking at this facade, sheers with blockout curtains would suit the style of home. Not plantation shutters.

I would do sheers with matching block out blinds, which will keep the windows looking tidy from the exterior, how many houses do you see with the curtains roughly drawn, not a good look for your lovely large windows. If you are wanting to control heat you need exterior treatments.

Is block out blinds , blockout curtains and blockout roller referred to the same thing?
If not, can someone share difference?

The block out blind that I suggest is like a simple roller blind with special fabric, Curtains are similar and can have an extra layer of block out fabric plus the fabric of your choice.

Having curtains would mean a sheer fabric curtain pulled across during daylight hours for privacy and then another curtain with block out fabric for night time privacy and light

Examples of roller/blockout blinds with sheers, and sheer curtains with blockout curtains. The sheers can be at the back or front of the blockout curtains. I have mine with blockout curtain the same colour as sheers, with the sheers at the front. Gives a softer look in my opinion…

I love this look also.

Yes Julie Herbert, that would definitely suit the homes style.

Where are you?

Which way does it face?

That makes a difference to functionality and comfort.

Of course hopefully you considered that when choosing the windows in the first place, but window furnishings can go some way to compensating.

Thank you everyone for these details :)

Internal plantation shutters are def better suited to more traditional styles...

However external venetian blinds (as per Julie's image) are always a great option to add facade dimension & texture (but pricey $$$) and arguably provide maximised control over light/solar gain. Internally you can't go wrong with sheer window furnishings and they always look most effective when done to the full ceiling height

Budget is blowing up for curtain-blinds, so need to see if we should go for wall-to-wall Sheer curtain OR just standard size (which is window width) to match with roller blind's width. Here are our specs. Any further recommendations appreciated.

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BTW, we are only considering sheers for front facade windows and back living area big window.

Def wall to wall.

Bedrooms with theatre scrim will entertain the neighbours.

Window coverings are an important part of keeping your home cool and heated in summer and winter. The cost should of been part of the budget originally. So areas like an oversized pantry, or an oversized walk in robe, could be reduced to allow for more important details that impact the long term comfort of the home. I suggest you do all window coverings correctly according to their orientation and use. Even if you have a temporary window treatment until you can afford the correct coverings for long term benefit.

You could use roller blinds and sheers, or venetians and sheets, both would suit your modern home.

Sheers lol .

Or when the budget allows, I absolutely love these.

Thanks for your inputs so far guys.

One more question ...for big window (3.6m wide)/wall(4.2m) : would you split the sheer in half to open on each sides or keep one piece to open on one side? We have roller blinds behind it which is split as well.

The curtain split I recommend to be in the middle. So you have a small amount of curtains gathered together each side. With a side pull curtain, you will have a large amount of curtain gathered on one side, and that will block your outlook. And personally I would always keep the sheer closed.

If you have an openable window or door need to be able to drawer curtains aside from the opening. So plan accordingly. Splitting long width makes install/removal and cleaning easier