how many play1's can I connect to my playbar...?

You can only have two Play 1's or two Play 3's as surround sound with a playbar. You can add more but they wouldn't be bonded and you would have to group them.

The software right now will only allow you to connect 2 Play 1s or 2 Play 3s for surround sound mode.
If you are just grouping for Stereo then you can do as many as you like, including play 5s... but that's a bit pointless if you ask me.

If you are investing in a playbar + play 1s/3s for Surround sound then please do your homework first and make sure your TV is capable of Dolby 5.1 Audio pass through or that you have Bluray player that will do DTS to DD5.1 conversion - otherwise you may not be happy with the end result and it is quite a lot of money to invest.

personally I would be buying a sub to go with your playbar / play 1's. As far as I inow you can only connect 2x play's ( 1/3/5's ) to the playbar, however, if you seriously wanted more speakers in the same room you could just create a different zone and group them. However I believe this may have some delay involved due to the latency of certain play modules, but I'm sure someone more tech savvy can answer that question.

personally I would be buying a sub to go with your playbar / play 1's. As far as I inow you can only connect 2x play's ( 1/3/5's ) to the playbar, however, if you seriously wanted more speakers in the same room you could just create a different zone and group them. However I believe this may have some delay involved due to the latency of certain play modules, but I'm sure someone more tech savvy can answer that question.
You can only have Play 1's or Play 3's bonded to the Playbar for surround sound. Yes you can stereo pair any of the Play 1,3,5 and then group them to the Playbar but there might be a delay with voice when watching TV.

personally I would be buying a sub to go with your playbar / play 1's. As far as I inow you can only connect 2x play's ( 1/3/5's ) to the playbar, however, if you seriously wanted more speakers in the same room you could just create a different zone and group them. However I believe this may have some delay involved due to the latency of certain play modules, but I'm sure someone more tech savvy can answer that question.
You can also use the connect:amp with ceiling speakers to achieve the surround sound, a lot more expensive but can be done that way to.

Thanks for the comments/advice TV is compatible so no worries there.

End goal is 5.1 was just wondering how many you could add to the playbar however i do only intend to have 2 P1's and eventually the sub, that said given the output of the play1 im not actually sure i would want the Sub but i'll no doubt get it to complete the setup. 

Do I need to get a bridge to connect a Playbar with extra speakers or can i do it over my own wifi network. I have a time machine which is dual band and have my sonos on a separate band to my everyday devices. 

When connecting Play:1s or Sub you need to be in SonosNet mode.  Which means you need 1 Sonos device (any device - can be bridge) hooked to your router.

When connecting Play:1s or Sub you need to be in SonosNet mode. 
My router isn't in the same room as my TV where my playbar and P1's will be, any solutions? 

When connecting Play:1s or Sub you need to be in SonosNet mode. 
Just get yourself a Bridge and hook that to your router. SonosNet will build itself from there.

Go find somewhere you can properly listen. You will not believe the difference the sub makes 😉