First of all when it comes to incentives, it used to be possible for sales advisor to offer about 3%. This could be either cash discount, "free" carpets, rear garden turf of a combination. Now, with Help to Buy, most house builders don't have to offer anything. There are more buyers than they can (or want) to build houses for.
A £9,000 discount is quite good but as Anthyboy suggested, check that the price hasn't been ramped up before the discount is applied. Have any other homes gone for "full price" or is every home "discounted"?
The more worrying concern is the proximity of social housing.
Quite frankly you should
avoid buying any home anywhere near social housing.You can choose your house, but your cannot choose (or do anything about your neighbours)
Even on a Private estate, all it takes is one bad family to destroy a nice neighbourhood.
Buying adjacent to social housing all but guarantees you will have several bad neighbours.
As you already realise, when it is time to sell and move, the social housing will be bedded in, the old fridges washing machines and scrap cars will be everywhere, gardens unkempt and the single mother's babies will have grown up into swearing rude young children!
It will take more than a few thousand off the price to sell and your only buyer will be a 'buy to let' landlord who will demand a low price!
It is good that you "stumbled" on my
website. There is a lot of great information there for you.
It is also good that the house builder is Miller, one of a minority that I rarely hear anything bad about, that wins a lot of NHBC Quality Awards and are rated five stars by their customers.
But try and buy well away from any anti social housing!