Hose is only about $0.10/LF, so I would say just to connect up to your existing system, set the timer, and lay out hose is something you can do easily yourself - or probably about $100-200 range depending on if handyman or landscape/irrigation contractor does it - add about $100 probably if needs to be buried a few inches down for plant irrigation.
Unless this is a drip system to prevent expansive soil from drying out I do not recommend any irrigation other than hand watering within 5 feet of foundation, so be very careful - because too much water, especially within 3 feet or so of foundation, can cause foundation problems as well as wet basement. And remember, essentially all expansive soils turn to mud and lose bearing capacity when very wet, so excessive water can be as bad as not enough - and be SURE to turn system off if rain or snowmelt has provided enough water.
Watering to control expansive soils can be a VERY risky operation - personally, though sometimes necessary as a retrofit, I recommend against it - I prefer vapor barrier under entire foundation, and them border of non-expansive soil all around the house to prevent expansion/contraction damage. Failing to do that is just sloppy workmanship by the builder.