Owning your own home

I had my place done a couple of years ago:

10 x Replacement casement windows, 2 x single doors with side panels & 1 x French doors – 28mm Double
Glazed, white inside & out, PVCU “A+” rated energy saving frames and glass.
White handles to all windows.
1 x Replacement Porch front door, side panels and return window with top above.
Solidor – Ludlow composite door, Anthracite Grey door, white inside & white frames. Brushed furniture,
lever/lever handle, letter box. Ultion cylinder Thumbturn lock.
Building works
Dining room - remove lower brick work, turn half bricks for a clean edge and install new French door.
Client to make good internal plaster work, exterior will be completed by us.
Waste removed from site.
All materials required will be supplied and fitted – 4-day installation.
Net Total £8,570 + VAT Total £10,284

We ended up getting guttering, fascias, soffits and cladding done too, and needed scaffolding, so we ended up getting a deal on the lot as it was all one company.
Assuming you don't want walls removed and multiple doors changing, less than £10k

Issues we had were the roof joists were fucked under the dormer, no way of knowing until they too the old soffits off and sent me a pic of rot holding our roof up!
Added a day on to the job and they fixed it for absolute peanuts (£300 iirc)

This was Double Glazing Essex, based in Benfleet, I live in Laindon, Essex.
http://www.doubleglazingessex.com

Not sure how far into London they go, but i recommend them heartily.
I smashed a window on the patio door when doing to gardening, stone got flicked up by the strimmer.
Ended up fixing it for the call out fee only (£70)
(possible because we had a blown pane in the front room from instillation, that they forgot to come fix, we didn't chase because it was a low priority for us and was waiting for the summer)