How to determine the position of the noise source in an apartment building?

Question

Do it yourself

The new building has several entrances and 20 ± floors. Half of the apartments have not yet been sold, half live. Constantly someone new appears, begins to make repairs. There are strict rules about the times when noisy work is allowed.
Often we are faced with the fact that someone starts ditching / drilling at “illegal” times.
Several times a day in house chats we try to determine whose builders in which apartment this time made a mistake in the time zone.
I would like to automate this search for the source of noise. And maybe keep noise level logs, like in museums. At the same time, the budget is not for an elite LCD for a professional industrial system, but for wire cutters, electrical tape and arduino (I exaggerate slightly).
The sound from the perforator along the walls in a monolithic house spreads, alas, very well, but still fades away with distance.
They thought to install on each floor a sensor on the wall, in each entrance, in order to determine the entrance / floor at least by the relative maximum level.
Have you seen successful implementations or descriptions of such monitoring?
What sensors are best to use? Probably piezo.
How to collect signals from about 120 sensors?

Answer 1

I think 5 sensors are enough to localize the source within 1 wing of the house. Naturally, they must be adjusted after installation using known noise sources.

Answer 2

If you have an HOA, then the manager should know where repairs are currently being carried out. And in general, noise sensors on each elevator platform will quite help to determine the entrance and +/- floor.
Greater accuracy = higher cost.

Answer 3

There are tons of applications on the phone that measure the noise level and its frequency. When I had something at 50Hz at night, it was barely perceptible, but very annoyingly noisy, it helped to find the source
https://play.google.com/store/search?q=spectrometer...