Sliding glass doors... question

[longpricklygrass]

what would you expect the price to be?
I will be having sliding glass doors put in across the extension which is the width of a standard victorian house.
Architect has given me three choices between 7500-12000 pounds.
Is this the right sort of price range (we're in London).

I am assuming good quality glass nice surround. The price of the doors and the frame, not the extension or putting in doors.

We are having sliding doors across the back of our Victorian House- about 2.8m high- costing around £10,700. London as well. Your quotes don't sound unreasonable but God knows. I'm losing all sense of perspective 3 months into a 7 months project ...

£5000 in London-fitted-by is systems based in Norwich. That includes the cost for them to travel to measure up. 2x2.5m wide doors. I love them.

Id systems

Thanks. Helpful.
Is that installation costs as well?