Owning your own home

We took out sash windows and put in 'normal' hinged UPVC (In southeast for reference). From memory it was ~£800 per window (lounge bay windows) and ~£600 for a rear door. Smaller windows about 60 * 100cm were ~£400.

Our sills & casings were in good shape so it would have been more if they had needed to replace those as well, but they checked when they came to give the quote.

Might vary from different installers, but they were a bit rough and left a few dings in the casings so we had to sand it down, make good with polyfiller and paint. All doable but would have been much easier to sand flat an empty casing instead of around the window so I'd happily have paid a bit more for a company who would also make good the painting/after work.

What are you replacing and with what do you want to replace them?

Are they wooden sash windows or uPVC double glazed?

I got the rear of our house and a door done a few years ago for about 3k installed (Crystal Windows) - that was five windows of various sizes and openings.

I was happy with the work - they did it in two days - and had no issue with the windows since, it also included plain wooden internal sills where required at no cost, but the windows are not especially pretty and am currently having the ground floor totally redone anyway so got rid of a couple of windows and the door.

We got them to come back and quote for uPVC sash windows for the front of the house years later. It was the same salesman, even though it seemed like he'd forgotten us, and he took his chances big time. Wild quote for ten grand or something. Told him to do one, and I do think they dropped it to eight, but I eventually decided to keep the original Victorian sash windows in the front of the house and have them renovated and am happy to have plain but reliable and secure double glazing at the back of the house.

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)