Given that LoRa stands for "long range" then adding a few extra metres (size of a house) shouldn't really pose a problem. This website (radio-electronics.com) states: -
There are several key elements of the LoRa wireless system. Some of its key features include the following:
- Long range: 15 - 20 km.
- Millions of nodes
- Long battery life: in excess of ten years
So it does appear to be ideal but the devil is in the detail and you would have to research what size battery would give you the "ten years" and under what environmental conditions. This is crucial I suspect and you may find that the 3 sensors you require will give far more life if they transmit their data (say) once per hour to a LoRa modem/interface that collects that data and sends it on to wherever.
The reason why I suggest this is that LoRa requires has a receiver that consumes several mA and this may need to be activated quite a lot and this will be the main flattener of your battery.
Dumb transmit-only-devices that blindly "send" a few times a day can certainly last for years on very moderate battery sizes.