When Requesting An Extension At Work messages in a Professional tone

I’m asking for a short extension to make sure this lands well.

I’m trying to make sure this is done right.

I’m a bit behind and want to reset expectations early.

I’m aiming for a clean, well-thought-out result.

I need to adjust timing to deliver something solid.

Let me know how you'd like to proceed.

I need a bit more time to do this properly—can we extend?

Let me know how you'd like to proceed.

I’d target [new date] as the new delivery date.

I can complete this by [new date] if we adjust.