When I renovated the interior of my house 9 years ago, I only replaced the two parlor windows with replicas of the original design. The previous owners had kept the original single pane windows because they didn’t want to replace them with aluminum windows as they did in the rest of the house. The original windows were too drafty and not in good shape so we replaced them with custom Marvin windows that had insulated glass. You can see the portion of the window sill that fell off in the picture below.
2nd floor windows:
I kept the 3 aluminum windows on the 2nd floor during the previous renovation, but decided that I should take this opportunity to replace them with replicas of the original design for the upper windows. My next door neighbor still has their original windows, so I was able to copy them. The best to install new windows is during the time when the scratch coat is curing and before the finish coat of brownstone is applied. The lead time for custom Marvin windows is about 8 weeks, so I need to order these as soon as possible so that the windows don’t delay the brownstone timeline. The window vendor measured the existing openings and prepared shop drawings shown below.
I double checked the dimension of the parlor windows to make sure that the details of the 2nd floor windows would match the details of the parlor windows.
Garden floor windows:
The garden windows are single pane originals and have been painted shut, so I have never been able to open them. In order to replace these windows, the window installer said that the bars would have to be removed. The bars are going to be cut out anyway for the brownstone renovation, so it makes sense to take this opportunity to replace windows too. We will replace them with Marvin aluminum clad windows. The exterior aluminum cladding is good for durability and the inside wood frame will be painted and the glass will be insulated. After the windows are installed, the bars will be re-installed. These windows will not have divided lites like in the upper windows.