As long at you are under 100metres , just run cables. Run the outdoor Cat6a variety, or lay regualr in conduit, Dont run just one, run two (One for now and one for later/if something breaks.)

You can buy other point to point wireless netwoking devices as suggested below, but these will all add more power use and complexity as they are a little specialised to get working well.

Cat6a will allow you many years of cheap and reliable service and will be cheper in the long run unless you’ve got some really difficult terrain to work with.

You could also run Multi Mode fibre optic cable up to 550m with 2 cheap swiches that have an SPF port at either end. This will cost a little more, but willgive you near unlimited expansion

the ISP provided hubs are fine, if you need more ports buy another little switch.

depends on how far the other place is… best is to dig another trench and run some SM fiber cables out there.

or if there is a clear line of sight to install a p2p wireless bridge eg from tp-link, or ubiquities

Point to point WiFi is low cost and works great as long as you have line of sight.

Two options that come to mind are:

1. outdoor wireless mesh, or
2. wireless bridging.

In either case, these will need power.

Dish beam across to another AP

If it’s just for CCTV, then look at using POE (power over ethernet) which will allow you to run just a single cable to each camera as it will do data and power. You will probably need a switch or router that provides POE, assuming your current one doesn’t (extremely unlikely if it’s a residential one, particularly from BT). Just check the distance you need to cover for compatibility.

I like Ubiquiti’s stuff, and they have specific setups for POE switches, cameras, and recorders for CCTV and are pretty well regarded. You can continue to use your BT hub, just plug it in to the Ubiquiti setup, no issues with capacity or anything else. If you can’t run a cable, they also have long range wireless bridges that might work for you, although you will need power at both ends (not needing power is why POE is so compelling if you can make it work).

Check out some Ubiquiti wireless gear. I would start there and see if anything will fit your needs.

It depends on distance. you won’t overload anything with more ethernet connections, with an appropriate network switch you can effectively scale the number of ethernet connections forever.

ethernet distance however is an issue, your maximum is around 100 meters before things get complicated. If it’s within 100 meters i’d reccomend a cable every time.

If it’s further away. you’ll want to set up a point to point wifi bridge something like this. Pretty straight forward and relatively inexpensive, point them at eachother. depending on distance and budget you can go up to and beyond 10KM with this method.

another alternative is a 4g router. that way you only need one sim card, connect all your cameras to that.

few different ways to skin this cat.

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openreach are unlikely to help you with this if you already have a line in place.

We plan on running ethernet/fiber (depending on the length of run and whatnot) to our shop/barn/etc from our house.

Ubiquity also has some awesome wireless options, but personally, I’d rather do wired.

In the field, we use cellular data (for RTK corrections and whatnot). It’s really the only option.

The deciding factor on what to use is really just the distance. How far away are these buildings?

You can run lots of ethernet cables without a problem it doesn’t dilute the existing outputs you can even add something called an ethernet switch to add more. They do external wifi access points you can stick on a pole outside to cover an area. It’s best for speed to run those off an ethernet cable. You can power them through the same ethernet cable as well to simplify installation cabling. Its only when you want to run very long cables +300mtrs you might need alternatives.

What distances are you talking about? A map with what you want to do would be helpful.

Additionally, what are you trying to accomplish with the cameras? Live monitoring and capture all the time?

One option is to run a cable between the locations, either Cat6 or Multimode Fiber if the location is further than 100m.

Another option is using a Wireless link. There are fixed wireless devices that have directed beams to reach out up to 10km distance between nodes.

Ubiquiti has a product called Nanobean that is quite popular and that you can use in this scenario.

In the Fiber or Wireless link option, it is assumed there are power outlets on both ends of the link. If power is only available on one end, then you could double down on Cat6, use PoE extenders to be able to run a Cat6 cable over 100m, and then have an PoE powered access point given enough power is left at the end of the cable run.

Get wifi antennas. My buddy was beaming internet to his parents place 5km away with 300mbps speed. As long as there is straight shot sight line you can beam fast wifi across your property easily.