These simple sound proofing ideas will be ideal for most properties and in some cases even for historic listed buildings if you don’t wish to go through the planning permission process.
Acoustic blinds or curtains
If your building is poorly insulated against noise from outside, then acoustic blinds or curtains can go some way to reducing the amount of noise entering rooms. It is important to remember however that insulating your room this way will be good at reducing echoes in a room but only when they are closed which is ok at night but you will need other sound proofing measures for daytime.
Fake synthetic grass is popular with gardeners that like the low maintenance aspect of it but it is also being put to use as a form of insulation. Whether it is laid on floors or walls it has proven to be a good soundproofing material if you like your spaces green and natural looking.
The beauty of acoustic panels is they are effective at insulating sound coming through walls and they can be decorative. But if your property is listed you may still need planning permission to install them.