What is a Window Schedule?
In this article we will explore window schedules in some detail, what they are and how to create one.
Want to get a window schedule template? All Detail Library Members can download the sample window schedule excel spreadsheet and sample window schedule drawings to use as a starting point in their own projects. (Details at the end of this post)
A window schedule can be key in communicating window specification between the architect, manufacturer and contractor and should be read along with other contract documentation such as specification information and general arrangement drawings.
Window schedules are a convenient way of presenting complex information about the different window sizes and types that are specified. This ensures full and useful information to the manufactures for pricing and fabrication, as well as accurate installation information.
Although the name implies that the schedule is for windows, it refers to any external doors and windows that contain large amounts of glazing such as those manufactured by a window supplier. Some examples include sliding, bi-fold and glazed patio doors or solid doors which are part of the window frame system. Solid doors such as front doors will usually be scheduled separately or with the internal door schedule.
When do I need a window schedule?
A full window schedule may not be required for small residential renovations where old windows are being replaced for new matching windows. In this case, the contractor, manufacturer or window supplier will normally come to the property, measure up the windows and provide a manufacturers quote and/or manufacturer’s drawings to confirm price and design prior to fabrication.
For more complicated designs, when new windows which do not match the existing are to be installed or a new residential building is designed, a written or graphic schedule can be used.
What needs to be included?
A graphic schedule can be a great way of communicating a number of things without having to transpose information into a spreadsheet. This can be done by simply using the proposed building elevations, adding some extra annotation and turning off all the irrelevant layers such as the facade. Some of this extra information can include glazing specification, opening of windows and heights from the FFL (finished floor level).
Where there are multiple of the same windows in your building, an extra drawing might also be useful such as a window type drawing. This allows you to add further detail of structural opening dimensions (s/o), frame dimensions and specification. It can also include window specific building regulation notes.
Whether you decide on a graphic schedule or a written one, below is some of the information to include:
Window reference – Windows in construction layout drawings should contain a reference code which should match up to that in the schedule.
Name – This could be as simple as the location of the window to differentiate it from other similar windows.
Style – Such as casement, sash, sliding, etc.
Opening type or direction – Such as inward, outward, etc.
Manufacturer – This can also include the product series or manufacturers reference.
Structural opening – This lets the builder know the dimensions to create the opening for the window. Each window frame will require an installation tolerance between the structure and frame, this information is usually provided by the manufacturer and is dependent on the structural material, the window frame material, size and design.
Size of window (width, height, thickness) – These are usually the structural opening dimensions minus the installation tolerance.
Material – Window frames will normally be made from timber, aluminium or PVC. Many modern windows can also be mixed timber and aluminium.
Colour and finish – Such as painted RAL colour 9003 for timber or powder coated RAL colour 7016 for aluminium windows.
Style of hardware – Locks, handles, etc.
Glazing specification – This is especially important if there are critical areas of glazing.
Weight – This may be a requirement if there are large panels of glazing which are too heavy to be installed by hand and require craning.
Acoustic rating – In urban areas or for houses near busy roads, a planning requirement may require windows to have an acoustic rating. However, this may also be a nice addition for acoustic comfort.
Most modern windows are specified as double or triple glazing. This means each window will have two or three window panes and can be specified the same or different depending on location.
S – Standard float glass in accordance with Building Regulations part K and all current British Standards
This is the most common type of glazing.
L – Laminated glass in accordance with Building Regulations part K and all current British Standards
Laminated glass is a safety glass which is created with an internal film between two layers of tempered glass. When struck, the glass will remain adhered to the film, preventing the glass from falling through the frame.
This glass is typically used on the external pane of ground floor windows to increase security and prevent someone entering the building through the window.
It is also used internally, for glazing which falls below the 800mm guarding height to avoid the risk of falling if broken or where the risk of glazing being struck is high, just as full height doors leading to a terrace.
T – Toughened / safety glass in accordance with Building Regulations part K and all current British Standards
Toughened glass is a type of safety glass which when broken crumbles into small granular chunks instead of splintering into jagged shards.
This type of glazing is used in areas which may be liable to knocks from users such as doors onto a terrace area, but where there is no risk of falling. Other applications include small areas of glazing on timber doors and shower doors.
P- Privacy film / frosted glazing
When designing windows on a boundary where privacy is a planning requirement or bathrooms to private rooms such as bathrooms, different types of glazing can be used.
Frosted glazing has one of the panels of glazing which is permanently frosted, usually kept internal to the air barrier so the glass on both external sides is flat to the touch and easy to clean.
Privacy film can be applied after the window manufacture to create a non-permanent frosting which can be removed by the user. This option may not be possible in areas where a planning requirement requires frosted glazing.
O – Obscured / back painted glazing with insulated panel behind
Obscured or back painted glazing is usually used in window panel systems in areas where visibility is not wanted, such as window panels in front of kitchen counters or bathrooms. This is used more commonly in large facades with repetitive windows rather than on single family homes.
Useful things to remember
When producing a drawn window schedule, in the UK, windows should be drawn as on the external elevations with the arrow pointing to the location of the handle. In the US the arrow points to the side that is hinged.
Below is a series of drawings showing some of the most common types of window openings, and how to show them in elevation.
Download the Window Schedule Template
We have put together a handy selection of Window Schedule resources for all our members to download.
The Window Schedule Template pack includes:
- Window Schedule Excel Template
- Window Schedule Drawing Example PDF
- Window Schedule Drawing Example CAD file
- Typical Window Symbols UK PDF
- Typical Window Symbols UK CAD file
To download the schedule, log in to your account and follow the link below, or head to the Resources Section on the Details page.
Not a member? Sign up now to get access to this schedule, plus lots of other really useful resources!
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Written by Aida Rodriguez-Vega, architect and researcher. At the Detail Library, Aida keeps busy by carrying out technical research and drawing new details for the ever-growing library.