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Do your research
Research windows and styles, certainly, but also check into companies that you choose to do business with. Ask around to friends who've replaced windows about their experience with particular suppliers and contractors.
Invite three to four companies to your home to get an estimate
Don't make a choice based on one double glazing price quote. After you've checked around, choose three or four companies that have a good reputation and have been in business for some time and make an appointment for them to come to your home. They'll need to see scope of job to give you a reasonable estimate of price to do it.
Always have your windows measured by a professional
Don't order based on your own measurements, no matter how reliable you think they are. Choose a company that will take measurements themselves, if for no other reason that it then becomes THEIR responsibility if any of windows ordered don't fit space for them.
Finally, don't assume that you're stuck with same look you've got. Replacement windows can make a spectacular difference in your home's appearance and value. Barring prohibition for historical or council reasons, you can have that picture or bay window you've always wanted. It's all a matter of finding it.
Matthew Anthony writes for many home improvement sites including double glazing and window treatments and blinds.