How to determine window and door handing correctly
Planning guide for windows and doors
When ordering windows and doors, “left” or “right” is not a complete specification. The same opening can be described in opposite ways depending on whether somebody stands inside or outside. On projects with several rooms, terrace connections and external doors, such uncertainty quickly adds up: a sash may hit a radiator, block the route to the terrace or open on the wrong side of furniture. A reliable specification separates three questions: From which side is the view described, where are the hinges, and which way does the sash move? This guide provides a practical method for window and door schedules, explains special cases and helps coordinate handing room by room before order confirmation.
A handing specification has three separate pieces of information
A clear order starts not with the side but with the viewpoint. Write “viewed from inside” or “viewed from outside” on every sketch. Only then state the hinge side: if the visible hinges are on the left in that view, the sash is left-handed from that viewpoint; if they are on the right, it is right-handed. Finally, add whether the sash opens inwards or outwards. These three details prevent two people from assessing the same component from different viewpoints while meaning different things.
Handing, hinge side and opening direction are often mixed up in everyday conversation. Separating them is worthwhile when planning: handing describes the side of the pivot axis, while opening direction describes the area into which the sash swings. An inward-opening window uses space inside the room; an outward-opening element uses space in front of the façade. Do not rely on a rule of thumb without a stated viewpoint. Instead, use the same wording throughout your schedule: “room, element number, view, hinge side, opening direction”. It remains clear even when surveying, installation and ordering are handled by different people. If the supplier drawing uses other symbols or terms, ask for the mapping to be explained before approval.
Use the hinge side, not intuition
Stand directly in front of the installed or planned element and use the view expressly named in your documents. Find the hinges or pivot side of the moving sash. Hinges visible on the left mean left handing in that view; hinges visible on the right mean right handing. A sketch helps with concealed hardware: draw the frame as a rectangle, add the sash and mark its fixed pivot edge with two small circles. The swing arc also shows where the sash travels. Label the handle edge too, so that the pivot and operating sides are not confused.
For a single inward-opening window the check is particularly easy to visualise: first decide whether the drawing shows the internal view. Mark the pivot edge there and draw the sash in its open position. This reveals whether it would stand in front of shelving, a worktop or a radiator. The product description identifies inward opening, but not automatically the hinge side wanted for your project. Choose that separately and check it in the order confirmation. A photo of the shell does not replace a sketch, though it can support one if the camera position and viewing direction are clearly labelled. With several similar openings, also check that the photo and element number really belong together.
Derive inside and outside from actual use
Opening direction fundamentally changes the space needed. An inward-opening sash needs room indoors, whereas an outward-opening element requires a carefully considered outdoor area. Check more than the fully open sash. Everyday ventilation position, access to the handle, curtains, shutters and other shading solutions also belong on the sketch. For windows, it should also be clear from which position in the room they are operated. Think through the sequence of movement: someone approaches the element, reaches for the handle, possibly steps back and guides the sash past an obstacle. A solution that looks symmetrical on the elevation can therefore be impractical in the room.
For a front door, an outward-opening external door may be suitable if space inside the entrance must remain clear. The product name alone is not decisive; consider movement in the actual entrance area: where does someone stand while unlocking, and where are the step, landing, letterbox or bicycle? Record whether the door is described from outside or inside, and mark the opening area on the plan. Also check whether waiting people or stored items could stand in the swing area. Changing the opening direction later normally changes several related features, including hinge, lock and handle sides. Therefore, mark such a change not only on one plan but throughout the whole element schedule.
Read plan, elevation and swing arc together
The floor plan answers whether a sash can move without conflict indoors or outside. Draw in the wall, opening, furniture and circulation routes to scale or at least in proportion. A quarter-circle from the pivot point shows the swing area. This simple drawing reveals conflicts hidden in an elevation: a coat rack behind the front door, a bed beside a window or two sashes blocking one another in a corner. Write “inside” or “outside” beside the arc so the movement direction is not reinterpreted later. Near a room corner, the drawing should also show whether the handle and hand can be reached adequately beside the adjacent wall.
The elevation complements the floor plan because it shows the division and position of individual sashes. Two adjacent windows may call for a symmetrical appearance, while operation in the room suggests opposite hinge sides. Even for panelled internal doors the desired design must therefore be checked against the actual route of movement; the product type alone does not define project-specific handing. Keep the same element number in every document, for example GF-01 for the kitchen and FF-03 for the bedroom. Elevations should clearly show wall side, viewing direction and opening arrow. Ask the supplier which view its drawing uses and how it indicates handing. This clear assignment is more dependable than a verbal statement such as “the door opens to the left”.
Plan terrace doors from furniture layout and outdoor space
Terrace doors connect two areas of use, so their handing must be checked from both sides. Inside, a dining table, sofa, curtain or radiator can restrict the swing area. Outside, seating, planters, a step or the route along the façade may be affected. Draw the open sash on both sides and check on which side the handle is sensibly accessible when entering and leaving. Consider whether a regularly used passage must remain fully clear or whether the sash will usually be opened only for ventilation. Test two typical situations: a quick trip outside carrying a tray and opening the door when garden furniture is already in place. This assesses everyday usability better than an empty floor-plan area.
A single inward-opening terrace door needs a different room assessment from an outward-opening version. Where the sash sits indoors beside fixed furniture, the hinge side may determine whether the handle remains accessible. If a narrow outdoor area is planned, its use is still a separate planning matter. Do not state only “left terrace door” in an enquiry; write, for example, “internal view, hinges left, inward opening”. Add a short functional note such as “main route to the garden remains clear on the handle side”. Also record whether furniture is fixed in the plan or shown only as an example. Otherwise, a later room change may quietly alter the basis of the handing decision. The note shows why the configuration is intended and makes a fresh check easier after plan changes.
Two sashes need an additional functional decision
For double-leaf windows and doors, asking left or right is insufficient. First establish which sash opens first in daily use and which serves as the second sash. Then describe hinge sides, handles and the opening movement of both sashes from one consistent view. A drawing should include both swing arcs. Otherwise, it remains unclear whether the sashes open towards the centre or away from it, and whether one restricts access to the other. The desired clear-passage side should also follow from the intended use. Name the leaves unambiguously in the schedule, for example “sash A, used first” and “sash B, opened second”, rather than referring merely to left and right halves.
For a double inward-opening window do not silently assume that both sides are operated equally. Ask specifically: which sash is used most often, how is the second one released, and where is the handle positioned in the internal view? These questions matter especially if the window is behind a table, beside kitchen units or next to a tall cabinet. Also check the situation with only one sash open: is operation still convenient, or must furniture first be moved? The answer may affect the decision on division or a different opening type. Have the opening sequence and handing confirmed together in writing, rather than discovering during installation that both leaves open but the frequently used one is on the inconvenient side.
Describe sliding and folding doors differently from hinged sashes
Sliding doors do not have a conventional side handing for a turning sash. What matters is which element moves, which way it travels and on which side it stands when open. Describe the viewpoint as clearly as for hinged sashes: “internal view, moving sash slides right” is clearer than “opens right”. Add which passage side is mainly used and whether moving parts should run in front of or behind fixed fields. Draw the closed and open positions side by side. This makes clear which field releases the passage and where the sash rests when open. For this construction type, the product drawing remains the essential reference.
For Patio Life lift-and-slide doors the order should expressly state the travel direction and position of the moving element; the name alone does not establish project-specific side configuration. Also check the position of handles, furniture and curtains along the entire travel path, not only at the opening. Folding doors, in turn, are described through the sequence and folding arrangement of their elements. Mark where the stack stands when open, which direction each leaf moves and which side becomes clear for passage first. A simplified plan view with several pivot points is more informative than a single left-right arrow. Anyone combining different opening types on one façade should create a shared external elevation. It will expose inconsistent descriptions, untidy handle arrangements or overlapping movement zones at an early stage.
Special forms: check top-hung, pivot and roof windows separately
A top-hung opening window has its pivot axis at the top; the usual left-right question becomes secondary to opening direction, operating side and projecting movement. State whether the sash tilts outward or inward and where the handle or opener is located. For top-hung windows opening outwards “hinges at top, opening outwards” is therefore the useful basic description. Also check whether an outward-opening sash projects into an area in use or could meet another building component. The position from which the window will be operated also belongs in the plan. Agree the precise design and usability against the product documentation rather than transferring the scheme for a side-hung window.
Pivot and reversible windows do not turn around an ordinary side hinge axis. Instead, the position of the pivot and the movement space on both sides matter. For a roof pivot window include the operating position, sash position when opened and use of the area below in room planning. A handle shown on the left or right is no substitute for stating the actual axis. Draw in section which part of the sash swings inwards and which outwards. Fixed glazing has no opening handing, but it can still influence the intended composition beside moving elements in the elevation. Clearly distinguish fixed and moving fields, and do not accidentally include fixed fields in the schedule with a handing specification.
Build a handing schedule for the entire project
Create one handing schedule instead of scattered messages, photographs and floor plans. Useful columns are element number, room or façade side, element type, internal or external view, opening direction, hinge or travel direction, sash sequence, special use notes and drawing revision. Add dimensions from the governing plan, but do not mix dimension checking with the handing decision. One line per element makes changes traceable. Use the same element number on plan, elevation and order so that a door is not confused with a similarly named window. Add a status such as “to check”, “agreed” or “released for ordering”. This stops an unresolved direction being passed on as a final choice.
Coordinate the schedule with the whole process: structural openings, finished floor build-up, electrical planning, heating surfaces, kitchen design and furniture can all affect operation. Consider typical routes from the entrance to the coat area, from the kitchen to the terrace and from the bed to the window. In refurbishment projects, a site visit with a taped swing radius or a cardboard strip the width of the sash can help. It makes spatial conflicts tangible without assuming technical properties. After each relevant plan change, recheck only the affected lines, but mark the new revision of the entire schedule. If designers or installers use their own plans, provide your list as the decision basis and compare it with their drawings afterwards. A qualified professional should assess suitability for the specific building where needed.
Compare drawing and order confirmation before release
The most important checkpoint comes before the binding order. Check every position against the latest drawing: do the element number, view, opening direction, hinge side, number of sashes and movement direction all agree? Do not mentally turn the drawing around. Read the labelled view and inspect the hinges or movement path exactly there. Then compare the swing arc with the current furniture and outdoor-space plan. After a plan change, a previously sensible hinge side may suddenly obstruct the passage. For the final check, use a printout or an unalterable version with a clear date. Mark each checked position individually instead of confirming the list merely as “seen”. Keep questions in writing and ask for an unambiguous graphical response.
Also check that everyone uses the same terms. If a document contains a short label such as “left” or “right”, clarify before release which viewing side it is based on. Do not adopt a designation whose perspective cannot be followed from hinges, arrows or the movement path. Compare attachments with the main document too: a correct sketch helps little if the order-confirmation line gives a different direction. Windows and doors from Bloomcabin carry a 5-year manufacturer guarantee. Delivery takes 4–6 weeks, subject to order confirmation. These details do not replace checking the final configuration. A fully reconciled handing schedule before ordering is the most reliable way to avoid misunderstanding about the required opening.
Frequently asked questions
Is left handing always left when viewed from inside?
No. “Left” is clear only together with a defined view. Documents can use different viewpoints. Always state from which side you are looking, then mark the pivot edge and hinges there. Compare this representation with the symbols in the product drawing rather than deriving the viewpoint from a short label.
How do I determine door handing in a new build without installed hinges?
Draw the doorway on the floor plan and decide where the sash should swing. Mark the pivot edge as the hinge side, then add the internal or external view and opening direction. Check the swing radius against furniture, routes and the outdoor area. The clearly labelled sketch should form part of your order documents.
What else must I specify for a double terrace door?
Along with the view and opening direction, record which sash opens first, which follows second and where the main passage should be. Draw both swing arcs and label each sash individually. This keeps the opening sequence, handle side and movement process understandable even for people who were not involved in early planning.
Do sliding doors have left or right handing?
For a sliding door, travel direction is more meaningful than handing as used for a hinged sash. From a clearly named view, describe which sash moves, which way it slides and which field it covers. Always check the specification against the product drawing and the intended passage side.
When should I confirm the handing finally?
Confirm it once the floor plan, furniture positions, floor build-up and key outdoor areas have been agreed, but before binding order confirmation. Compare every element number with the drawing and order line. Where anything is unclear, the supplier should explain the configuration in writing and on a drawing. Recheck affected elements after later plan changes.
Next step
Correct handing is not guesswork but a traceable planning decision. For every hinged element, name the view first, then the hinge side and opening direction. For sliding, folding and special windows, describe the axis, travel direction, moving field or folding stack instead. A floor plan with swing arcs shows whether the choice works in everyday use, while an elevation secures the division and sash arrangement. Bring all details together in an element-based schedule and compare it with drawings and order lines before order confirmation. This creates an unambiguous, project-wide basis for ordering and installation.
