WiFi to an outside building

[Ches0405]

I have Wifi to my house and a landline.

I need to get WiFi to an outside building where there will be no landline and its @ 10m from the house. Can I just have another router installed as the easiest way to get WiFi in the building?

[GD1]

@Ches0405  Another router won't help as having 2 routers on the same connection would be a nightmare, have you thought about ethernet from the house to to outbuilding?   You can install a network switch and access point in the outside building

[Ches0405]

To run an ethernet, it would require @ 30m run around the front of my house, down the side, along a fence line to the new building.

[TimmyBGood]

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@Ches0405 wrote:
Can I just have another router installed as the easiest way to get WiFi in the building?

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No: as @GD1 indicates having two routers on the same domestic network is almost never appropriate.

Ethernet works up to 100 metres.  Without that you're looking at Powerline adaptors or point-to-point wireless hardware, either of which is considerable less reliable.