I want to change the light switch in the living room to a dual control How to wiring

There are only two wires in the bedroom single open and single control, and you need to add one more wire, and three wires can be made into a single open and double control switch, can you add another line? If there is no way to add a wire, it cannot be made into a dual-control switch.

Find a professional to fix it.

The budget aspect is to look at the size of your own living room, and then add the material cost, manual cost, decoration company's management fee, etc., which does not include your audio, speaker, song ordering system, etc. For the sound insulation materials you are talking about, they are divided into three categories1 Slag wool decorative board has excellent heat insulation, heat preservation, sound absorption, earthquake resistance, non-combustible and other properties; And light weight, sound absorption, noise reduction, heat insulation and other characteristics 2The performance of rock wool decorative sound-absorbing board is slightly better than that of slag decorative sound-absorbing board 3Glass wool decorative sound-absorbing board has the characteristics of light weight, sound absorption, heat preservation, fire prevention, flame retardant and so on

You can consider using light steel keel to make a double row, such a structure is more secure!

If the living room is changed into a bedroom as a whole, there is no need for any partition, and the terrace is changed into a living room, but it is necessary to do engineering, and the most important thing is the problem of waterproof and thermal insulation.