envelope an alexa skill working on amazon echo that detect sound in your house and send an sms/whatsapp and enable mic to listen to the noise coming from your house. This item has the following option 1)comunication by mail or sms or whatsapp 2) minimim level of decibel to detect in order to send alert
As I read your project description what I understood is you need a plugin or extension for Amazon Alexa home kit. If there is any unwanted noise is in the house when there is no one it got alert and start to record that voice. And it should send a notification to the user about it. It should be more like a security purpose. That is a very useful thing I say and I am interested to develop it. All through the budget is a way to less. So if you like to discuss it then just inbox me and we get it started.