Goes without saying but make sure yu keep the camera smasher and any preggers mates away from the area treated with roundup just in case as it says on wikipedia some reports say its totally safe other reports say a slight risk.Always best to err on the side of caution.
From watching my granddad who was a groundsman, reseed the turf in a newbulid house he moved into. Its worth doing what the others say raking the ground and digging over as many lawns are an afterthought by the developer. very important if you have young uns who will want to play on the grass getting rid of any rocks or buliding waste.
Also you never know what you might find my Granddad and I found a 1930's toy car which i played with as really well made and then found out once one of the wheels broken it was worth a small fortune (well to a kid anyway)
Also if you do it say starting tomorrow dont forget for the next month or two we have frosts in the UK and if we get a bad one it might kill all your seeds. But at least it will have the whole of spring and summer to get settled in
If you wanna be sad
http://www.stewartsturf.co.uk/grass-seed.aspx
