Fibre run to Garden Office

Hey all - slightly outside of my comfort zone but.. Adding a garden office in the next couple of weeks and want to run some fibre..

Background - 10Gb backbone across the house internally, mix of DAC and copper and generally using Unifi kit. Adding a garden office to finally get off the dining room table (since covid) and want to make sure that I have a decent connection as *MAY* move my vmWare /ProxMox and NAS out from the current network closet (cough, cupboard under the stairs) which is where everything terminates.

New office building will be only about a metre from the house, already have a 32A socket on the outside of the house so hopefully won't need to run any internal->external power.

Run from the current PON / aggregation switch is going to be in the order of 25-30m (by eyeball - need to measure) and would have to punch out through a wall (breeze block/insulation/brick) with probably only a metre or so between the house and the garden room.

Was thinking of trying to get some multi-strand OS1/0S2 pre-termed with breakouts to give some redundancy and running some trusty Cat6A or higher as backup.

Planning on putting an external box on both old and new building and running conduit to sit the cable inside which has made me thing that I could _maybe_ get away without externally rated cables..

Thoughts? Just trying to shape mine and throwing open to the wisdom of the crowd

First thought is if you use internal cable to bridge the gap, how long would it take to replace the cable? If you could do it in under an hour, then may be. But otherwise go straight to external.

Not sure why you care calling your internal network as a pon but anyhoo.... keep to the os2 with condiult and forget the cat6a. even at a few metres you are creating a lightning risk

Stick a duct in and put some external grade Cat6 in, then in 60 years when it finally breaks down someone can pull a new one through the duct.

There is zero point in putting fibre in unless you want the novelty of it. Copper is good for 10Gb at those distances.