Boosting home water pressure
If everything else is fine (no line clogs, etc.), then the only way I know to boost water pressure is through mechanical means, i.e. booster pump. By the way, you shouldn't have to boost the pressure to the whole house if that is not desired. You can find the main line for the sprinkler system, tap in there, and only boost the outgoing pressure to the sprinkler lines. You will most likely also want to install a relay so that the pump only turns on when your sprinklers are on. Lastly, installing a booster pump is not overly difficult for an experienced DIY'er. It does, though, involve extensive plumbing and electrical knowledge. Additionally, your personal situation may require you to do some carpentry as well, if you have to house the pump outside. This could turn out to be quiet a project. For the most part, if you don't feel comfortable adding a new circuit to power your pump, wiring in a relay, and doing some plumbing work (probably pvc), then I would call a reputable electrician and plumber to help you out. Good luck.