Construction Window Schedule Preparation Checklist

Write down a reference for every window shown on the drawings, then check that the same reference appears on the plan, the elevation and any section that opening is drawn on.

Openings are often numbered on one sheet and left unmarked on another, which is where two people start describing different windows using the same words.

Note any opening that appears on one drawing but not on another, or that looks a different shape between sheets, and raise it as a question instead of deciding which sheet is right.

Differences between sheets usually mean one drawing was revised and another was not, and only the person who drew them can say which is current.

Ask your designer which drawing revision governs, and record the answer, rather than resolving a conflict between sheets yourself.

Record which openings are new, which are existing and staying exactly as they are, and which are existing openings being widened, narrowed or closed up.

Retained openings are frequently left off schedules altogether, then arrive on site as a surprise when finishes or ironmongery are meant to match.

Write down the room or space each reference belongs to using the names people on site will actually say, not only the room numbers printed on the drawing.

Site conversations happen in ordinary language, and a schedule that cannot be followed verbally tends to be ignored when something needs checking quickly.

Note any two openings that look identical on the drawings but sit in different rooms or on different elevations, because they often end up needing different handing or finishes.

Copying one entry across to another opening is a common shortcut, and it is how a window arrives hinged on the wrong side.

Keep the whole list in one place and note which drawing revision it was built from, so anything that changes later can be traced back to a starting point.

Without a recorded starting point it becomes impossible to tell whether an entry was changed deliberately or simply mistyped at some stage.

For each reference, write down whether you expect that window to open at all, and if it does, which part of it is meant to move.

Fixed panes and opening lights look similar on an elevation, so an owner assumption about fresh air can survive right through to delivery unchallenged.

Record which way you want an opening light to swing or slide when you are standing inside the room facing the window, and say so in those words.

Handing described from outside and handing described from inside are opposites, and the schedule should state which viewpoint the entry uses.

Note every window you would have to reach across furniture, a worktop, a bath or a radiator to operate, and flag those references for discussion about opening type.

Reaching distance is easy to establish now from a furniture sketch and awkward to solve once the frames are made.

Write down where you would like handles to sit given how each room is used, and ask what the opening type you have chosen actually allows.

Handle position is usually a consequence of the opening type rather than a free choice, so the two decisions need to be made together.

Record which windows you imagine leaving open when nobody is in the room, and ask what options exist for those references.

Anything involving security devices, restrictors or escape openings should be put to a qualified professional and confirmed against local requirements, not settled from a schedule.

Note which windows you expect to clean from inside the building, and ask the supplier what the opening type you are considering allows for that.

Upper-floor cleaning expectations often drive the choice of opening action, and finding that out after ordering leaves no easy alternative.

Look at each elevation and write down which windows are drawn with their heads in line with each other and which are not, then ask whether that is deliberate.

Misaligned heads on the same wall are usually a consequence of something inside the building, and it is worth knowing which constraint caused it.

Note where a cill lands relative to things that will sit under it, such as a worktop, a radiator, a bath rim, a headboard or a desk.

The relationship between cill and furniture is one of the few window issues an owner can spot on a plan long before anyone else does.

Where a window and a door share the same wall, record whether you expect their heads to align, and raise it if the drawings show otherwise.

Head alignment reads strongly in a finished room, and changing it late usually affects the structure over the opening rather than the window itself.

Any change to the height of an opening needs to go to your designer and, where structure is involved, to an engineer before it is treated as possible.

Write down which windows you expect to see out of while seated, and which rooms you are happy to have a higher outlook in.

Seated sight lines are a normal owner preference, but they rarely appear anywhere in a drawing package unless someone writes them down.

Note how much wall is left between each opening and the nearest corner, and whether you expect a curtain or blind to stack in that space.

Curtain stacking space is a dimension owners care about and designers cannot guess, and it is easier to raise before the opening is set out.

Where existing windows are staying, record whether new openings are meant to look like them or to read as clearly different, and say which you prefer.

Almost matching tends to look like a mistake, so the intention needs to be stated rather than left to whoever compiles the schedule.

For each opening, record whether you expect the reveal to be plastered up to the frame or lined with a board or timber, and note where that preference changes room to room.

Reveal treatment changes what the frame edge looks like and what has to be ordered with the window, so it belongs in the schedule rather than in a later conversation.

Write down whether you want an internal cill board you could stand something on, or a plain plastered return, and ask what the chosen construction allows.

Owners often assume a shelf-like cill comes as standard, and in many constructions it is an addition that has to be asked for.

Note what you expect to see around each opening on the outside, such as a brick reveal, a render edge or a surrounding board, and ask whether the drawings show that.

External edge treatment is what the opening will actually look like from the street, and it is frequently decided by default on site.

Record where you expect to fix a blind, a curtain track or a pole above or inside each opening, and raise it before the walls and ceilings are boarded.

Fixings above openings depend on something solid being there, and once boarding is finished the options narrow considerably.

Ask the contractor or installer what backing is needed for the fixings you have in mind, and confirm who is responsible for putting it in.

Where you want a blind to sit inside the reveal rather than in front of it, ask your designer to confirm on the drawings whether the depth allows it.

Reveal depth is a drawing question rather than something to measure off a printed sheet, and it is easily answered while the design is still open.

Ask what ventilation provision the windows are expected to carry, who decides that, and whether it affects how the frames look.

Ventilation requirements are set locally and belong with a qualified professional, so record what you are told and confirm it applies to your property.

Record whether the inside and outside of the frames are meant to be finished differently, and note any opening where you want an exception.

Different inside and outside finishes are common but are not universal across systems, so the intention has to be stated and then checked with the supplier.

Write down what else the window colour has to sit alongside, such as external doors, rainwater goods, a garage door or existing frames that are staying.

Windows are usually chosen first and everything else is then matched to them, which only works if the other elements were considered at the same moment.

Decide and record whether handle and hinge finishes are being chosen once for the whole project or varied by room, and note any room where you want a different feel.

Mixed ironmongery finishes are a legitimate choice but they need to be deliberate, because they are touched and seen constantly in every room.

Note which openings will be seen in a single view from inside or outside, and check that their entries in the schedule are consistent with each other.

Inconsistencies between adjacent openings are far more noticeable than inconsistencies between rooms at opposite ends of a building.

Record where you are content with whatever the supplier offers as their usual option and where you are not, then ask what the difference means for ordering.

Being clear about where you do not care is as useful as being clear about where you do, and it keeps the conversation focused on the openings that matter.

Note which openings you would like obscured or patterned glazing in for privacy, and treat where it is needed as a question rather than a decision you make alone.

Whether obscured or otherwise particular glazing applies to an opening should be confirmed with a qualified professional against local requirements.

Ask who is producing the final schedule, whether that is your designer, the contractor or the window supplier, and write the answer down.

Ownership of the schedule is often assumed rather than agreed, and a schedule nobody owns is the one that quietly stops being current.

Ask what carries the structure over each opening and record what you are told, rather than reading anything into the way the opening is drawn.

Support over an opening is an engineering question, and nothing an owner records in a schedule should be treated as settling it.

Ask whether any openings in your project are subject to particular safety-related requirements, and confirm locally what applies to your property.

Requirements of this kind vary by location and by building, so route the question to a qualified professional and to the relevant authority.

Ask what will be measured on site rather than taken from the drawings, and at what point in the sequence of works that measurement happens.

Knowing which numbers are provisional until someone measures on site tells you which entries you can still change without disruption.

Check what information the supplier needs from you before anything is made, and in what form they expect to receive it.

Suppliers usually have a fixed set of questions, and answering them in one go avoids a chain of small clarifications later.

Ask who compares what arrives on site against the schedule, and how you would be told if something does not match.

Checking on delivery is far easier than checking after installation, so it helps to know in advance whose job it is.

Ask that every reissued schedule carries a revision marker, and keep the superseded versions rather than replacing them.

Superseded versions are what let you show when an entry changed, which matters when two people remember an opening differently.

Agree in writing who is allowed to change an entry once an opening has been ordered, and how you would find out that it happened.

Late changes are sometimes unavoidable, but an owner discovering one after installation has very few options left.

Photograph each opening from inside and outside before anything is boarded or rendered over, and file the images against the reference.

Photographs taken before closing up are the simplest record you will ever have of what actually sits behind a finish.

Keep a short list of entries that are still undecided and what has to happen before each one can be closed out.

An undecided entry that nobody is tracking tends to be resolved by whoever is on site that morning.

After any conversation on site about an opening, write down what you understood was agreed and send it to the other party to confirm.

Verbal agreements about windows are common and are exactly the kind of detail that is remembered differently by each party later on.

Note any opening that has been built differently from the schedule, and ask what follows from that before finishes go on around it.

Differences between what was scheduled and what was built should be put to your designer and contractor, since the consequences may not be limited to the window.