A typical retrofit window installation for 8 standard size windows can run you $5,000 to over $15,000.00 with Installation, depending on what company you choose.  A standard 6 foot sliding patio door can range from $2,500.00 to upwards of $5,000.00.  If you are looking for a Bay or Garden window those can cost anywhere from $2,500 to $5,000.00 as well.  There are other factors to take into consideration that could have an effect on the total project price, for example if your home exterior is stucco and you are putting in new construction windows or doors that is way more labor intensive and would add about 40 to 50% more to your total costs.
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