hello,
this looks good, though i think i mislead you on the relay when i did the chematic, i was at work and i used what i found most similar so sorry for that...
My relay is a latching relay, and the configuration is different.
Relay (RT314F05): RT314F05 Tyco Electronics, RT314F05 Datasheet
diode (1N4004): http://www.diodes.com/datasheets/ds28002.pdf
transistor (BC548B): Philips BC546, 547, 3 datasheet pdf
3 way terminal: http://www.123dapp.com/123D-3D-Model/3way-Terminal-Block/597576
decoder (HT12D): https://courses.cit.cornell.edu/ee476/FinalProjects/s2008/cl457_yft2/cl457_yft2/datasheets/HT12D.pdf
rf receiver : http://www.ebay.co.uk/itm/433Mhz-RF-transmitter-and-receiver-kit-Arduino-ARM-MCU-/230781136559?pt=UK_Sound_Vision_Other&hash=item35bba0aeaf#ht_1271wt_905
Im sorry and thank you