we didn't subdivide but it cost us...

200k house (4 bedroom)
25k extras (the things we wanted like evap, carpets, tiling, etc)
20k extras (the things we didn't know about like upgrade slab, council fees, temp fencing, connections, etc...)

167k land
5k stamp duty

now that we are in our house we spent
2.5k fences
3k driveway
3.4k security doors

we are now saving for more concreting, slate tiles, grass and general landscaping