Recently moved into new house and had the
broadband company installed the cable today. But they only to manage connect to the closest room from the entrance... and the Wi-Fi lost halfway through the house as it is a relative long place 25m from entrance to the shed in the garden for home office...
... Just wondering what will be the best solution of this?
I have the google Wi-Fi from my old place but it does not seems to work when I put them at the entrance/ half way of the 25m and the shed. Would connect more point solve the problem?
Getting coverage in a long house can be challenging, doubly so when the internet service is at one end. If you have a Google WiFi system, I would strongly consider running Ethernet to connect the secondary mesh points back to the primary via Ethernet, which would let you place them throughout the home without having to worry about how far apart they are. If you can only manage to run one Ethernet cable, I would use that to get the primary placed close to the center of the home, and then place the wireless mesh secondaries one or two rooms away from there so they can cover more distant clients.
If you decide to pursue a wired Google WiFi system, here's a help article with more details: https://support.google.com/googlenest/answer/7215624?hl=en
No, adding more points will not help here. If you have brick interior walls, you are going to have significant problems with WiFi coverage. The 5GHz signal the points use to talk to each other will have real problems getting through brick (or concrete, or plaster, etc.)
I would run an Ethernet cable from Bedroom 1 to Bedroom 2 and use that to connect a wired secondary Google WiFi point there. Hopefully, that will provide coverage to the kitchen/dining/reception room (but if there are more brick walls, it may not, in which case you'll need another point in that area, again connected back to bedroom 1 via Ethernet). Basically, you want to build a modest wired network here that's rooted in the LAN port of the primary Google WiFi unit in bedroom 1. You can make this a (small) tree structure with one or more inexpensive, unmanaged Ethernet switches.
Getting coverage to an outbuilding is always challenging, and with your primary in the front of a long house like this, with brick walls, it's going to require something more serious. Preferably, an Ethernet cable from your wired network in the house out to the shed. Out there, you can connect another Google WiFi unit to the Ethernet network. This will let it talk all the way back to the primary so it can join the whole WiFi network and provide coverage in the shed and the garden areas. There are some other possibilities (basically, buying some more expensive point-to-point wireless gear that creates a virtual Ethernet cable without having to run a physical wire). But, the point is, even though a mesh network can expand the usable coverage area, it isn't perfect.