1. Double Glazing
Double glazing offers the best insulation but the main concern is with the cost involved.
2. Build a Window Plug
Window plugs are easy to build, are made from inexpensive materials, and are highly effective.
3. Soundproof Curtains
Soundproof curtains are cheap and fairly easy to install
4. Seal the Air Gaps
Fill in any cracks, holes or gaps with a quality acoustic sealant.
5. Install Storm Windows
You can block noise by installing storm windows.