Re: alarm system
Piece of cake if a bungalow. No point in messing about with wireless, go for hard wired, far more stable and easy to add/upgrade if required.
P.I.R’s are the best bet, and you can buy additional ones easily. You will need a reed switch for your main exit door, assume front door and if there is onother in the kit use that for the back door. Get a dummy alarm box for the back, and one with a strobe for the front. The only bit of wiring that would then be visible is for the doors, and that will be inside and if dropped down in the corner will hardly show.
Will take less than a morning to do the lot.
Alex