A replacement window order can hold up an entire refurbishment if the information is unclear at the start. This guide to trade window ordering sets out what homeowners, builders and project managers need to provide before a made-to-measure sash window can be quoted, produced and delivered with confidence.
Trade ordering is not a standard retail purchase. Every opening, glazing choice, finish and fitting arrangement affects the final specification. Getting these decisions right before production protects your programme, avoids costly revisions and gives you a like-for-like basis when comparing quotes.
Start with the project route: supply-only or supply and fit
The first decision is who is responsible for installation. A supply-only order is often the right route for builders, contractors and experienced property owners who already have a trusted installer. It gives you control of the fitting programme while allowing the windows to be manufactured to the required specification.
Supply and fit is usually more straightforward where the property owner wants one team to manage the process. It can also reduce uncertainty on access, removal of existing windows and the condition of the reveals once work begins. The best route depends on who is managing the site, not simply on the purchase price.
Be clear about this at quotation stage. A window supply quote and an installed price are not directly comparable unless they include the same scope of works. Check whether the price allows for removal, disposal, making good, access equipment and any internal or external finishing required after fitting.
Measure the openings before you request a quote
Made-to-measure sash windows need accurate opening dimensions. For each window, provide the width and height in millimetres, measured in more than one place. Older London and Essex properties regularly have openings that are not perfectly square, particularly where previous repairs, settlement or altered plasterwork are involved.
Record the smallest width and smallest height of the structural opening unless your installer has confirmed a different measuring method. It is also useful to note the depth of the reveal, the internal cill arrangement and whether the existing frame will be fully removed or retained. These details influence frame size, installation allowances and the final sightlines.
Photographs are just as valuable as figures. Take a clear external image of each elevation, an internal image of each opening and close-ups of any unusual features. Bay windows, curved heads, stone surrounds, shutters, internal panelling and restricted access can all affect the recommended solution.
For larger schemes, create a simple window schedule. Give every opening a reference such as W01, W02 and W03, then match that reference to its dimensions, photographs and requirements. This prevents the common problem of having correct measurements but no clear way to identify which window they belong to.
Specify the window, not just the size
Two sash windows with the same opening size can be priced very differently. The specification should reflect the property, the performance required and the budget available.
Start with the style. Confirm whether you need a traditional sliding sash appearance, a timber-style sash solution or a replacement designed to match existing windows as closely as possible. Then consider the proportion of the sashes, glazing bar layout, horn detail, frame profile and furniture. These are particularly relevant on period homes where inconsistent replacements can affect the look of an entire elevation.
Glazing needs equal attention. Double glazing is a common choice for improving comfort and reducing outside noise, but the glass specification should suit the location. A busy road, a cold north-facing room or a property with privacy concerns may each call for a different approach. If safety glazing is needed near doors, low-level glazing or other vulnerable areas, flag this before the quote is prepared.
Finish choices should be confirmed early too. State the required colour, whether it is needed internally and externally, and whether different finishes are required on each face. Do not assume a colour name means the same thing across every supplier or material. Ask for the finish to be written into the quotation.
Use a like-for-like specification when comparing prices
A low headline figure is only useful if the product and service genuinely match. When comparing trade window quotations, look beyond the number of units and overall total. Check dimensions, opening configuration, glazing, finishes, hardware, delivery arrangement and whether VAT is included.
You should also check the frame material or system, sash detail and whether quoted measurements refer to the overall frame size or the visible opening. A smaller frame, simpler glazing or omitted installation item can make a quote appear cheaper while leaving a gap in the scope.
If you have received an equivalent written specification from another supplier, provide it with your enquiry. This gives the quoting team a proper basis for reviewing the details and, where possible, matching the comparable quote rather than making assumptions from a headline price.
Plan delivery around the site, not the production date
A fast manufacturing turnaround is valuable only when the site is ready to receive the order. Before confirming production, make sure there is dry, secure storage available and that the fitting team knows the expected delivery week. Windows should not be left exposed, stacked carelessly or delivered before access arrangements are in place.
For urban projects, delivery planning can be as important as the order itself. Consider parking restrictions, loading access, narrow streets, gated developments and whether a lorry can reach the property. If the windows need to be carried through a house, up several floors or into a rear extension, explain this in advance.
On phased projects, it may be better to schedule delivery in stages rather than receive every window at once. That depends on storage space, site security and the installer’s capacity. The right approach keeps work moving without creating avoidable handling risks.
Confirm details before the order goes into production
The order confirmation is the point to check every line. Read the schedule against your measurements and drawings. Confirm handing or opening arrangements, quantities, glazing type, finish, hardware, trickle ventilation requirements where applicable, and delivery address.
Do not rely on a verbal conversation for a detail that matters. If a particular sightline, colour, glazing bar pattern or access requirement has been agreed, make sure it appears in the documented specification. Changes after manufacture begins can affect both cost and lead time.
For trade customers, nominate one person to approve the final schedule. Multiple people sending changes through different channels is a reliable way to create confusion. A single approved version helps the supplier, installer and site team work from the same information.
Inspect the order before fitting begins
When the windows arrive, check the number of units against the delivery paperwork and inspect them before installation starts. Confirm the window references, overall dimensions, glass, finish and visible hardware. Report any concern promptly rather than waiting until the installer is on site with an opening exposed.
A quick check also helps protect the fitting programme. If one item needs clarification, it is far easier to resolve before removal work starts than after the existing window has been taken out.
A clearer order keeps the programme moving
Trade window ordering works best when the enquiry contains the practical information from the outset: accurate measurements, photographs, quantities, specification priorities, location and a clear decision on supply-only or fitting. Bespoke Glaze can then review the project properly and provide a tailored quotation rather than a vague allowance.
If a detail is uncertain, raise it early. A short conversation before production is usually the quickest way to protect the budget, the appearance of the finished property and the date your installers need to be on site.