Measuring Replacement Windows For quotation purposes, windows are measured from inside the house and this section explains how it's done. This diagram shows a single flat window with two opening lights, both hinged from the top of the frame. For quotation purposes, the frame is measured from inside the plasterwork reveals. The width is straightforward - just measure from edge to edge and as most companies are now metric, it's best to measure in millimetres. The height is calculated as being from the top of the window (inside the plaster again) to the bottom of the internal cill. For manufacturing purposes, measurements need to be taken from outside of the building and they must be brickwork to brickwork. Depending on your existing windows, you may have to remove some of the architrave or chisel back render, roiughcast or even part of the window the frame to see the actual brickwork. If in doubt, ask your supplier to measure for you. ALL supply and fit contracts will include a professional survey to ensure your measurements are correct. This probably WON'T be the case for supply only - and any mistakes will be your own responsibility. A bay window is measured as a series of flat windows. If you have a five sided bay, it is classed as 5 windows for quotation purposes. In this case, you measure five individual widths, which in most cases will all be the same. The height will be the same on all. This diagram shows a 5 sided bay with two side-opening lights. Diagrams should always be represented as being seen from the outside of the house and should show what design is required, not necessarily what is there now! A bow window can be installed in most properties to replace a conventional flat window. Measure the width of the required window and the height and specify the number of the number of facets. Only the overall width is required for a bow window, as the facets will be sized equally. A bow window requires a replacement inner cill board as well a roof and so will be more expensive than a flat window. The price of your windows will be affected by a number of things, but the most important thing to remember is that the more openings you have in a window, the more expensive it will be. Generally speaking, each opener will add approximately £55 to the cost of the frame. NOTE: When measuring for manufacturing purposes, measure and view from outside from each side of the frame and from top to bottom.

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