When to order windows and doors for a renovation
Planning a renovation
During a renovation, windows and doors are often ordered only once work on the building is visibly under way. That is usually too late: façade insulation, new floor build-ups, waterproofing, electrical planning or intended patio use may already dictate key decisions. The right order date is not a fixed calendar date, but follows completion of interface planning and precedes work that depends on frame position and opening sizes. Once existing openings, finished wall and floor levels, opening directions and installation details are clarified, the order can be released with confidence. Allow 4 to 6 weeks for delivery after order confirmation. Also allow time for measuring, queries, coordination and a possible installation date.
Set the order date from the construction programme
Do not begin with the question, “How many weeks in advance?” Start with an installation programme and work backwards. Before fitting, openings must be accessible, structural or damaged areas resolved, and junctions to walls, waterproofing and, where relevant, insulation planned. Internal reveals, window boards, plastering, façade work and floor junctions often follow installation. Each task can affect the required frame position. For every element, note which work must be complete beforehand and what work depends on it afterwards. This turns a general delivery period into a specific ordering window for your project.
A full renovation often needs a different rhythm from replacing individual windows. If the roof, façade and interior are tackled in sequence, one combined order can simplify coordination but may mean longer on-site storage. A phased renovation may justify separate orders, provided dimensions, appearance and the junction concept remain consistent through every phase. Check whether the home will be occupied during work, which rooms need to be closed first and whether temporary weather protection is planned. The right time has arrived when later decisions can no longer affect the frames already ordered.
Release final measurements only after decisive structural work
An order size is more than the width and height of an old window opening. Uneven surfaces, existing rebates, lintels, sills, reveal depths and any removal or addition of masonry also matter. During renovation, exposed damage, new levelling layers or changed façade finishes can alter the situation. Decide who measures, which finished or firmly defined surfaces are used as references, and who approves the dimensions. Photos with a tape measure, room and façade views, and a clear element number help link later questions to the correct item. Measure critical openings in several places and record variations rather than noting only an average. For out-of-square openings, diagonals and visible skew may also be relevant to professional assessment. The responsible person should then derive the order size from the existing data and intended installation concept. This keeps clear whether a figure was measured directly, set in planning or confirmed as a manufacturing dimension.
Do not wait for every cosmetic finishing task. What matters is that the structural opening, intended wall build-up and reference levels are fixed. If a new internal floor build-up is planned, the future finished floor level must be known for patio and external doors. Where external insulation is added, the team needs a shared understanding of where the frame sits relative to the insulation layer and how the reveal is formed. Uncontrolled measuring before these decisions shifts risk not to the manufacturer, but onto the site. Ask directly at the measuring appointment: which dimensions are existing, which are planned, and which can no longer change?
View the whole opening
Decide frame position and wall build-up together
The frame position determines how a window or door sits between the interior, structural wall and outer face. It is not merely an installation detail, because it affects reveal depths, window boards, shading, waterproofing and façade junctions. With new external insulation, looking only at today’s outer edge is not enough. Draw the full build-up in a simple section: existing wall, possible levelling layers, insulation, internal plaster, external finish, and the intended position of frame and sash. The sketch need not be a construction drawing, but it reveals unresolved choices early. Add internal and external window boards, existing shutter boxes or planned shading where they touch the element. Mark layers that remain and those being added. One section for a typical opening is sufficient only where the other openings genuinely have the same build-up. Plinths, bay windows, extensions or later-added wall sections can need different details. Record those exceptions in the element schedule before applying one sizing scheme across the building without checking.
Coordination at interfaces between trades is particularly important. The window installer needs information on the opening and installation plane; façade and waterproofing work needs the frame geometry and junction approach; interior work must know how reveals and window boards finish. A deep reveal can affect operation, cleaning and shading differently from a more flush position. Have the final junction details designed by the professionals responsible for the project. Before ordering, you should be able to answer: where is the finished internal edge, where is the finished external edge, which layer meets the frame, and who is responsible for each transition?
Test opening types in the room before ordering
A window can fit dimensionally yet still be inconvenient in daily use. Check opening direction and sash movement against the actual room plan: will there be furniture, kitchen units, a radiator, basin or curtains? Can the handle and hardware be reached easily? For inward-opening elements, the clear swing area inside matters; for outward-opening versions, the area in front does. A single-sash inward-opening window can be suitable where the planned room leaves enough movement space. The product name describes its opening direction; it does not automatically solve every installation situation. Record clearly from which viewing direction left and right are defined. A small cardboard model or a sash arc marked on the floor makes conflicts clearer than an isolated measurement. Also check whether an open sash will strike a deep reveal, the handle of a neighbouring element or planned internal lining. Where several windows are in one room, their operating logic should be consistent and make sense for later use.
For living spaces, consider ventilation habits. Will the window be opened only briefly for ventilation, or regularly opened wide for cleaning or access? In a bathroom or utility room, privacy, the position of services and operating height can also influence the decision. For a small high-level opening, a top-hung outward-opening awning window may be considered if its operation suits the design. Draw sash arcs on the plan and mark conflicts with furnishings. Carry out this simple check before approving the quotation, not only at installation.
Coordinate doors with floor level, use and furnishings
External and patio doors connect several levels: internal floor, threshold, external finish, drainage and the daily route through the space. If a new screed, floor finish or patio build-up is planned, the door must not be ordered solely from today’s levels. Show all heights on one drawing and name the future top of finished floor level. Also establish which way the door opens and whether an open leaf restricts paths, furniture, planters or access to the patio. A later change to the external finish is not a minor adjustment when it affects the door junction.
For a connection between the living area and patio, a single-sash inward-opening patio door can be an option if the swing area inside remains clear. If the outdoor area should be easier to use with leaves open, another opening direction or a sliding solution may suit the layout better. Do not decide from a façade elevation alone. Test the passage in everyday situations: carrying a tray, moving garden furniture, parking a pram or entering in rain. When ordering, ask which dimensions refer to the frame, opening and clear passage, so the design does not rely on different measurement terms.
Treat large glazed openings as a separate planning package
Wide openings to a garden or balcony need earlier decisions than a standard window because they more often affect structure, façade layout, shading and floor junctions. First check what opening width is actually available and whether construction above or alongside it will change. Then consider use: is the main aim daylight, a passage, or a wide opening? A Patio Life lift-and-slide door describes a lift-and-slide door configuration; whether it suits your wall build-up and use depends on dimensions, junctions and planning. Do not choose large glazed areas only after structural decisions have been completed.
The installation route also deserves its own place in the programme. Large elements must be able to reach their intended fitting location. Property access, routes through the building, working space and the sequence of other trades can all affect the installation date. Agree with the installation team when the opening must be ready, how the area will be protected and which work should pause during fitting. Shading is another important point: its fixing and guides should be considered with the façade, not only after windows have been ordered. Confirm large elements only once structure, opening size, frame position, floor levels and operating concept have been reviewed together.
View the whole opening
Decide unusual shapes and heritage-style elevations early
Precise measuring is especially important for round, triangular or angled openings because shapes, radii, angles and reference points must be defined unambiguously. A fixed triangular and angled window is intended for matching non-rectangular openings, but the name does not replace checking the actual geometry. For these elements, record not only overall width and height but every relevant corner point and orientation on the elevation. Provide drawings with an element number, internal and external sides, and a clearly identified top edge. This helps avoid two parties interpreting the same shape as a mirror image.
Glazing bars, sash divisions and profile views also affect when approval can be given. In planning, distinguish between applied glazing bars and bars that divide the glass: the appearance may be similar, but the construction is described differently. In existing buildings, discuss the intended façade effect using photos, elevations and comparison elements. A heritage-style outward-opening “Kombi” casement window can form part of a design brief where the stated opening direction and historic character are wanted. Record design requirements in writing before manufacturing documents are approved; later changes to divisions or special shapes can materially affect the programme.
Choose fixed, opening and combined panels deliberately
Not every glazed area needs to open. Fixed glazing can make sense where the view and daylight matter most and ventilation is provided by other openings. A fixed window is therefore an alternative to an opening window, not an equivalent substitute. Consider separately for each room how it will be ventilated, cleaned and reached when necessary. For a combination of fixed and opening panels, establish early which panel performs which role. This affects sash divisions, handle position, façade appearance and daily use. Look at the internal and external sides separately: a balanced division from outside may put a mullion exactly where an uninterrupted internal view is wanted. Conversely, a division designed only from inside may look unsettled on the façade. On an elevation, mark not only structural openings but also fixed panels, sash lines and opening directions. Then check from which safe, practical location the outer faces can be cleaned. If no clear method is evident, reconsider the panel layout before ordering.
This decision belongs before order approval because it rarely has no effect on dimensions and elevations. A wide fixed panel can create a calmer glazed appearance; an opening sash offers operation, but needs room to open and changes the division. Ask the question through a normal day: where will you ventilate in the morning, where do you want to go outside, which point must be cleaned, and which area remains permanently obstructed? Coordinate the selection with planned shading too. Choosing an opening element only for appearance when it has no useful purpose often creates complexity without a clear benefit.
Prepare the order as a complete approval document
A reliable order is more than a list of widths and heights. Prepare an element schedule with identification, room, elevation, opening direction, number of sashes, required division and particular notes on junctions. Add photos of the existing opening and a façade elevation where the external appearance matters. For doors, include hinge side, direction of movement and the planned finished floor level in the same document. For the entrance, an outward-opening front door with a panel may be considered where the defined opening direction suits the access and approach area. Do not confirm details that are only assumed.
Before approval, a short review by every project participant with an interface is worthwhile. The designer can compare dimensions and wall build-up, the installation team can assess the fitting situation, and you can check use and appearance. Ask for an explanation of unclear quotation terms: are dimensions frame or opening sizes? Which side is internal? Which position is called the hinge side? Which hardware, handles or divisions are included? Keep the final confirmed version with the measuring records. This documentation makes later queries easier, especially where further building work takes place between ordering and installation.
Build in time for decisions and installation, not uncertainty
The stated delivery period of 4 to 6 weeks begins after order confirmation and does not replace project contingency. Between the first discussion and confirmation, measuring, quotation review, technical queries and coordination with other trades may be needed. Afterwards, a date must be found when openings are ready, the site is accessible and junction work is organised. Allow a buffer before the desired installation day. It should not be used to somehow absorb unresolved dimensions later, but to protect real dependencies. A properly settled decision is more valuable than a very early order followed by change requests. Set separate milestones for readiness to measure, technical approval, order confirmation, expected delivery window and installation readiness. This shows whether a missing façade section prevents the order or affects only later work. Agree firm finishing and installation dates only from the confirmed order status. Working back solely from a desired move-in date can overlook that decisions before the delivery period also take time and need confirmation from several parties.
A final site check shortly before fitting is practical: are openings clear of scaffold parts and stored materials? Have floor levels, façade build-up or reveals changed since measuring? Is it clear who may make decisions during installation? After fitting, follow-on work such as internal finishing and external junctions should follow promptly, so transitions are not left exposed or unresolved for long. Bloomcabin provides a 5-year warranty for windows and doors. This warranty does not remove the need to coordinate selection, measuring and project-specific junctions carefully beforehand. Where anything is unclear, a short professional discussion before ordering is usually the better next step than premature approval.
Frequently asked questions
How early should I order renovation windows?
Order once openings have been measured, wall and floor build-ups set, and opening directions and junctions agreed. Delivery takes 4 to 6 weeks after order confirmation. Allow additional time for measuring, quotation review, questions and coordinating the installation date.
Can I request a quote before final measurements?
Yes. An early enquiry can clarify options and the process. For a binding order, however, distinguish clearly between provisional planning sizes and confirmed measurement data. Finalise only once the structural opening, future façade plane, interior finishes and floor levels should no longer change.
Why must new floor finishes be known before ordering a door?
For external and patio doors, finished internal and external levels affect the transition at the frame. Screed, floor finish, patio and drainage must therefore be considered together. If these heights are decided only after ordering, they may conflict with the intended installation arrangement.
Should I order windows and doors in one or several deliveries?
That depends on the construction programme. One combined order can simplify design coordination. In a phased renovation, splitting deliveries may make sense where openings are completed later. The essentials are secure dimensions, protected storage and a firm plan for each installation date.
What should I check immediately before approving an order?
Check the element number, dimensions, internal and external sides, opening direction, sash count, division, room allocation and relationship to finished floor and wall levels. Also confirm that shading, window boards, façade work and internal reveals allow for the selected frame position. Explain unclear terms before approval.
Next step
Windows and doors should not be ordered as early as possible during a renovation, but at the right planning stage: after binding measurements and once wall build-up, floor levels, frame position, opening types and junctions have been coordinated. From order confirmation, allow 4 to 6 weeks for delivery and add a realistic coordination buffer. Treat large openings, patio doors and special shapes as separate planning topics. A clear element schedule, checked drawings and a shared review of interfaces by the professionals involved make the order easier to follow and help avoid unnecessary changes during the build.
