Two landlines support

flaneurs_lobster

Have you got power in the outbuilding? Try powerline extenders, not ideal but by far the easiest fix (if they work). 

If you are installing power then get network cable installed at same time.

Frozen_up_north

Outdoor grade network cable is commonly available and as others mentioned is a more robust solution to extending your network to the garden office. It will give the best speed and not be subject to interference from neighbours or in the case of networking over power line adapters, interference from household electrical appliances, power line adapters may also cause radio interference too.

Windows 10 and 11 include a WiFi extender/repeater function, you might try a laptop in a window facing the garden office to see if an extender would reach. Obviously a proper repeater will have better antennas than a laptop and can use the same SSID/password, but if the laptop works then an extender certainly would. This page describes the setup: https://windowsreport.com/use-pc-as-wifi-extender/

Boohoo

Emmia said:

Boohoo said:

Emmia said:

rustyboy said:

Keep_pedalling said:

Do you have power running to the outbuilding from the house? If you do then you maybe able to extend your network with power adapters. 

If not and running Ethernet cables to the outbuilding is not practical then a mesh network with an external node on the wall nearest the outbuilding might fit the bill.

So I tried this when we first moved in. Ethernet through the window of the sunroom and over the path and through the window of the outbuilding. But not practical. 

Did you have any good suggestions for mesh network? 

That sounds like a bodge to test it out, personally I'd dig a trench and run the appropriate cables properly.

You could get some Ethernet cable and push it through a length of hosepipe and drill a small hole in the outbuilding and the same in the house and crimp the connectors on each end connect to  router but this is only doable if you can place the pipe out of the way.

It's similar to Virgin media green pipe used for their installations.

I think running the cable "in the air" between two buildings will be a bit irritating if you're moving things along the path (?) between them and will look terrible.
If you're doing improvements to the outbuilding to allow it to be used for a home office, I'd just do this as well.

Not in the air.

Running along the ground out of the way of foot traffic but that's if it's possible and safe to do.

As mentioned Virgin media do it for their installations but it may be an option for OP depending on the distance required.

J_B

Newcad said:

Activating the second line will mean a new phone number, with a new VOIP phone, new router, and a new broadband account - with all the associated setup and ongoing monthly costs.

Not very MSE

Newcad said:

If what you actually want is to use your existing phone (number), broadband, etc. then you need to extend those to the outbuilding rather than connecting to a different phoneline.

Much more MSE.

😁

john1

I have Voipfone Flex Business plan which uses my original 30 year old BT number plus a 056 (non geographical voip) number.

Each line can be either "fixed" desktop phones via wifi  or on my mobile handset  using "softphone" VOIP app. or both 

Total monthly cost  £3.60 + calls  Voiphone staff very knowledgeable and helpful https://www.voipfone.co.uk/Support.php

matelodave

We've been using one of these to extend the wifi from the church across the road to our men's shed and we get around 12mbit/s which seems to be adequate for most of our needs. - https://www.amazon.co.uk/WAVLINK-Outdoor-Wireless-Weatherproof-300Mbps/dp/B0CRYXSY33?

as an alternative something with a directional antenna might give you a bit more range and speed  - https://www.amazon.co.uk/TP-Link-CPE710-Long-Distance-Transmission-Weatherproof/dp/B08C5KY25X?

Other brand are available and its a one off cost rather than an ongoing charge for an additional broadband/phone connection.

Another alternative worth considering is a 4g/5g router using a sim card. We've successfully used one in our caravan and where we live (out in the Cambridgeshire fens) manage to get around 25mbit/s however in other locations we've achieved over 80mbit/s

rustyboy

Newcad said:

Activating the second line will mean a new phone number, with a new VOIP phone, new router, and a new broadband account - with all the associated setup and ongoing monthly costs.

Is that what you are looking for here?

If so then treat as as moving into any office anywhere that isn't currently connected, and get the provider of your choice to quote for a broadband with phone package and re-connection to the existing line.

If what you actually want is to use your existing phone (number), broadband, etc. then you need to extend those to the outbuilding rather than connecting to a different phoneline.

This seems to be the best option.
Wifi is patchy as we live in the countryside in a stone cottage so wouldn't be able to extend that from the house.
Not able to dig anything up - the previous owners set stone slabs between the property at the outbuilding so no sure I want to be digging everything up for broadband.

A reconnection would probably be the best bet here.

Thanks all for posting

Admins - feel free to shut down now if you want to