Powering multi effects

[MmmPedals]

If want to put a bunch of circuits in one box (i have in mind to 4) am i likely to get noise by wiring them all in parallel to one jack. This is very important because i am not going any battery option (no room).

[GibsonGM]

No; I do it all the time.  Just run each + and - from the jack to each board in sort of a 'star ground' pattern.  To the input jack if you are using it as a switch, of course.  As long as you're not daisy-chaining (series wiring) the boards, and each board ground goes back to the jack with a short, dedicated run, you should be ok. 
 
If you DID get noise, putting a large filter cap (47uF?) from + to ground with/without a 100 ohm series resistor before it would help out by acting as a reservior.  But try it straight first.  As long as your power supply can handle the draw of the 4 boards, you should be in good standing.
I do a few effects this way - 2 Marshall Guv'nors in 1 box, 2 TS-808's.  Then I can set volume/gain on each and switch in/out for leads!   

[T1bbles]

Surely this would be much like using a DC daisy chain to power your pedals? But in a more permanent form obviously.

I've been using daisy chains since I bought my second pedal, and as long as you've got a well regulated power supply (I'd highly recommend a Boss PSA-240) the pedals won't affect one-another at all. It can happen though, I've found that when using cheaper power supplies (like a cheapo Korg one for example) daisy chaining pedals will cause them to interract with one another by making each other buzz at certain settings or dropping the volume of other pedals when engaged. This doesn't happen with the PSA-240 I'm happy to report

[petemoore]

If want to put a bunch of circuits in one box (i have in mind to 4) am i likely to get noise by wiring them all in parallel to one jack.
  What are the circuits ?
  Any of them have LFO 'spikes' running through power wires?
  Super high gain inducting along the same plane as sensative wires [input runs parallel to output?]?
  What is on the other side of the jack ?
  Any other large current adjustments [rise / fall] you're planning on having ''the workers'' to do ?
  Probably won't work as an outside antenna if the box is shielded or unshielded, depending on the wire runs, how sensative the input might feel about such matters.
  Doesn't sound usual, ''four in a box'', she quite often notices these things, and may tell ask ''four what?'', she's good for how and why tell/asks also, if you hear funny noises and they bother you, you'll be re-thinking about them.
  May be it's nothing a BFC or some other containment or isolation can't handle.