家里要换窗户（sash window)，大约要换5个，邻居有个朋友在做窗户的工厂上班，他自己也会安装， 给我们的价钱很便宜，比我们从这个工厂买和用他们的人安装能便宜1000镑。现在犹豫不定，想让邻居的朋友弄，但是又怕以后窗户有什么毛病，没有保修，请问大家装sash window 以后出现毛病的多吗？有没有懂的，给点建议，先谢谢了！
如果是我，信任这个邻居的话，就会相信他推荐的人。这边这种活儿找人推荐的比自己找的靠谱的多
就算以后修，也可以找他，付工钱也不用1000吧
用着靠谱也介绍给我呗。。。我也想装sash，好漂亮的。
找timberwindows，材料加人工，平均1800，保修
不明白为啥要装sash window， 除了好看，保暖隔音都比不上新式的。老房子里那种里面都配上 shutters 一起用才保暖隔音。
木框double glazed的sash Windows换一个得2，3千，楼主这个要上一个省1千那还是很合算的。
如果是老房子，那还是keep original style比较好，特别是豪宅。
我是准备装一套的在后面，所以稍微关注了一下，感觉如果不做木制框架的，其实upvc和普通的窗子区别不大，各种保温保暖系数也是符合building reg的要求。双层三层的玻璃也可以做。但是从来没用过，所以等我装好了再实际反馈一下吧。
下面这个表格是个指导价格，我也不知道trade price和私人买有什么区别，到时候装完一并反馈吧。LZ装好了也交流一下。
Guides to average sash windows prices in the UK
Prices shown are for guidance only. Always get a quotation from a reputable supplier, as prices are subject availability and to the specific requirements of your installation.
We have excluded fitting prices as there is so much variation in the work required to install sash windows across the UK
How much do double glazed sash windows cost?
Sash Window Size (width x height)
Description of window
Average supply only timber sash window prices
Double Hung : 500mm x 1200mm
engineered timber box sash
from £390 +
Double Hung : 800mm x 1200mm
engineered timber box sash
from £450 +
Double Hung : 1000mm x 1200mm
engineered timber box sash
from £465 +
Double Hung : 1200mm x 1200mm
engineered timber box sash
from £565 +
How much do uPVC sash windows cost?
Sash window size & energy rating
Windows material
Average supply only sash window prices
Single hung: 600mm x 1000mm – B rated
single colour white uPVC
from £192 – supply only
Single hung: 900mm x 1000mm – B rated
single colour brown uPVC
from £260 – supply only
Single hung: 1200mm x 1000mm – B rated
single colour white uPVC
from £250 – supply only
Single hung: 1500mm x 1000mm – B rated
single colour white uPVC
from £282 – supply only
Because the way sash window works, (up and down) it can never close as tightly as modern day windows, therefore, it is not as energy efficient as modern day windows (comparing same profile, i.e. double/triple glazing)
Our old flat is a 189x built tenament flat, with single glaze sash window. It was a listed building so had a bit more restrictions on what can be done, and what cannot be done.
We had specialists looking into replacing the original wooden sash windows with UPVC sash windows in the past when we refurbished it, the conclusion was, if you have (a lot of) money (we are talking about at least £2500 per window), then go for it, otherwise, don’t bother - even secondary glazing would be better.
We had 5 windows and didn’t have £10k plus for replacing them at the time, so we went for repairing/draught proofing the existing ones. That still costed us over £4500 at the time, for 5 windows only. 
Also, i notice the price you quoted, are for quite small, modern day flats/houses’ windows. Old flats’/houses windows are much bigger, so it will easily cost over £2000 per window.
You can have windows look like sash, but with different opening. 
能换别的换别的，别样这样的
not allowed on listed buildings 