Compare window and door quotes item by item
Buying guide to windows and doors
Two quotes can appear to describe the same refurbishment yet refer to different projects. One may say “complete windows”, while another lists windows, connections, disposal and internal work separately – or not at all. The total in EUR is therefore the outcome, not the basis for comparison. Set both quotes beside your own opening schedule and check every line: which component belongs to which room, which sizes and opening direction apply, what is included in the unit, and which work begins only on site? This approach is especially useful where windows, patio doors and entrance doors are combined, as low-priced items can otherwise hide missing services. The aim is not the longest quote, but a clearly defined scope you can follow before ordering and installation.
01 / Gather documents
Start with one shared checking sheet
A reliable comparison starts before the first price. Take an identifier for every opening from the plan or survey, such as GF-W01 for the kitchen window or FF-D02 for the balcony door. Add the room, quantity, width and height, intended use, and details such as reveals, shutters, window boards or nearby furniture. Then assign every quoted line to that identifier. Grouped items such as “ground-floor windows” are comparable only if an appendix clearly breaks down every opening. If it does not, request an item-by-item addition. This reveals whether one supplier has allowed for three units and another for four, or whether fixed glazing has mistakenly been read as an opening window.
Use the same columns for both quotes: item number, quantity, dimensions, construction, opening type, glass, finish, fittings, accessories, removal, installation and pricing basis. Also note whether a statement is confirmed, assumed or entirely open. A single-leaf inward-opening window is not equivalent to a line described simply as a “casement window” while its direction remains unknown. This is true even when similar dimensions are stated. The checking sheet is not technical design; it turns quotes into decisions that can be checked. Let suppliers retain their own item numbers and enter your identifier beside them. This makes queries, changes and later order confirmations easier to track without confusion.
Read dimensions correctly: opening, unit and reference plane
With dimensions, not only the number matters but what it describes. Ask specifically whether width and height mean the structural opening, external frame size, order size, clear passage size or another reference dimension. A quote stating “1000 × 1200 mm” is incomplete without that reference. Also check the notation: width by height, millimetres or metres, and dimensions before or after allowing for joints. Where several windows are identical, the quantity should appear directly with the dimension line. If dimensions are given as “approximate”, clarify whether a binding survey will still be carried out and which items may change afterwards.
Consider dimensional special cases separately. A triangular or sloping fixed-glazed window needs, in addition to external dimensions, a clear shape sketch or unambiguous drawing reference. For doors, the external frame size, available clear width and threshold area should not be merged into one vague description. Check the building elevation too: a dimension may be correct but assigned to the wrong room. Do not measure for ordering yourself as a substitute for professional planning. Instead, establish who is responsible for the final survey, when it will take place and which completed work – such as plaster, floor build-up or waterproofing – it assumes.
02 / Match the items
Compare unit type and opening direction without shortcuts
The term “window” says little about use and construction. Record for each item whether it is fixed glazed, single-leaf or double-leaf, and how it opens. Inward- and outward-opening are not interchangeable descriptions: the space needed in the room, on the terrace or balcony, and the operation all differ. A quote may show an opening direction in a drawing while the text says nothing. Ask for a written allocation in that case. Also check left or right handing from the agreed viewing direction. A bare “left-hand” label without an explanatory view can be unnecessarily unclear when checking a quote.
For large openings, the use question is often more important than the price of one line. A Patio Life lift-and-slide door represents a different operating concept from a hinged door, so do not compare only area and glass proportion. Ask which leaves move, how everyday access is intended to work, and whether the drawing suits furniture, circulation routes and the outdoor area. With a double-leaf door, also establish which leaf will be used most often. If a supplier offers an alternative, it should appear as an alternative with its own item, not quietly replace a different construction. Only then can you see whether a lower amount is a real saving or a different use concept.
Assess glazing and visual appearance separately
Glazing should not disappear behind a generic term in the quote. Have each item state the intended glass type, the desired visible characteristics, and whether planning or use creates special requirements. Where performance values are offered, comparison quotes must use the same reference basis: a value for glazing alone is not automatically comparable with one for the complete window or door. Also ask whether every unit receives the same glazing, or whether the bathroom, stairwell, ground floor and roof use different versions. An open glazing description is not a minor detail, because it changes appearance, daylight, privacy and pricing.
Glazing bars need a second look. Note whether bars are surface-applied or intended to divide the glass; these terms do not describe the same construction. “Without bars” should also be stated where an existing elevation or visualisation creates expectations. A fixed-glazed window can create a calm, large glass area, but it does not replace ventilation. Do not judge a quote by the number of large glass fields alone; consider the opening units in the same room as well. Where elevation drawings are available, have them labelled with item numbers. You can then check whether divisions, leaves and glazing bars in the quote suit the façade being discussed.
03 / Check the specification
Specify fittings, operation and visible features
Many disputes arise not at the frame, but with items touched every day. List handles, their colour and position, opening restrictors, lockable versions, ventilation positions and other requested operating features for each item. A blanket phrase such as “standard fittings” is too vague for direct comparison because it does not say what is actually included. For windows, ask whether all leaves are operable and which operating arrangements are planned. For high-level openings, also establish how they will be used day to day. The solution must suit the room, not merely the product name or a showroom sample.
An outward-opening top-hung fanlight may, for example, have different ventilation and operating logic from a side-hung unit. Check that this choice is clearly described in the quote and correctly shown in the elevation. For doors, lever handles, pull bars, lock side, closers and other visible equipment should likewise appear in the line or in a clearly referenced appendix. Do not compare the price of a quote with detailed equipment against a lump sum without these details. Ask who will choose if fittings are decided later. Without a documented selection basis, it is impossible to know whether both totals cover the same visible and functional specification.
Check doors beyond the door leaf
For external and patio doors, the item consists of more than the moving leaf. Check the frame, threshold area, sidelights, fanlights, opening direction, handle side and, where relevant, links to adjacent windows. An outward-opening panelled entrance door should be listed in the comparison as exactly that configuration; the title alone does not imply further properties. The interface with the floor build-up is especially important: ask which height assumptions were included in the calculation and who confirms them before ordering. If a sidelight is shown but not named as a separate or clearly included item, its inclusion remains open. Also decide which drawing has priority if documents conflict. If external elevation, internal elevation and quote text do not agree, the intended specification must not be guessed from the cheapest or most detailed document. Have the affected item drawing corrected and confirmed again.
Patio doors also require a look at the route outside. An single-leaf inward-opening patio door can take up room inside, while an outward-opening version needs clear swing space outdoors. Compare the door handing with furnishings, curtains, railings and paving, without drawing more from a sketch than it shows. Where several units are linked, the quote should make the coupling and layout clear. Do not write open points merely as “clarify door details”; ask specifically: “Is the sidelight included?”, “Which elevation applies?”, “Is the threshold included in this item?” Precise questions lead to more reliable additions than a general request for a complete specification.
04 / Define installation scope
Break installation down into work stages
A unit price and an installed unit are different comparison objects. Separate delivery, removal of existing units, opening preparation, placing, fixing, connection to the structure, sealing, trims, and internal and external work. A quote may mention installation but mean only placing the new unit. Another may list further stages. Neither is automatically better; what matters is whether the scope fits your construction sequence. For lump-sum items, ask for a short description of services. You do not need a standards manual, but you do need a clear boundary between what the installation team does on site and what must be prepared by others.
Check interfaces with other trades early. Who removes old window boards? Who repairs damaged reveals? Who coordinates connection details with insulation, plaster or façade work? And who ensures subsequent work suits the installed unit? A low installation amount can be reasonable when preparatory or finishing work is deliberately assigned elsewhere. It is not directly comparable with a more comprehensive quote. Record access conditions too: floor level, transport route, floor protection and necessary clear space can affect the process. Clarify these points in writing before placing the order rather than treating them as assumed when delivery arrives.
Make ancillary work and exclusions visible
The difference between two totals often lies in ancillary services. Look specifically for packaging, transport, unloading, site protection, disposal, scaffolding, lifting equipment, coverings and cleaning. Do not only check whether a word appears; check whether scope and responsibility are clear. “Disposal included”, for example, may mean old units only, without covering work to reveals or other building materials. Conversely, a lump sum may include incidental tasks that another supplier prices separately. Add a dedicated column to your checking sheet: “included, excluded, unclear”. This turns scattered footnotes into an objective decision list. For every unclear point, add a consequence: extra order, own work, programme coordination or an unknown cost. This gives an apparently small exclusion the right weight. Missing cleaning differs from unallocated lifting equipment that can affect the installation sequence.
Special constructions should not disappear within a general window item. A roof pivot window involves a different installation situation from a vertical façade window; compare associated work only when it is genuinely described in the same way. The same applies to unusual formats, difficult-to-access openings or alterations to an existing building. For exclusions, always ask about the practical consequence: must another company be appointed, does the work remain the client’s responsibility, or will it be charged at cost? Do not demand an invented lump sum where the condition becomes visible only after removal. A clearer approach is a rule for documenting, agreeing and commissioning open findings only after approval. This protects both sides from unclear expectations.
05 / Check the confirmation
Compare discounts, options and pricing fairly
A price comparison becomes unusable when options and fixed services are mixed. Mark every item as included, alternative, optional or not offered. A line that can later be deducted does not belong in the same comparison total as a firmly ordered service. First calculate a cleaned base total: only items included by both suppliers in the same specification. Then add the desired options separately. Quantity discounts, promotional notes or early-payment discounts change the amount payable, but do not answer whether the scopes are identical. Also check whether prices are stated net or gross and whether VAT is treated consistently throughout.
Check the calculation structure and validity. Do unit prices multiplied by quantities match subtotals and the final total? Is a discount assigned to individual products or deducted only at the end? Can it disappear if an item changes? Ask which assumptions about the survey, selections or site conditions have not yet been priced. A quote with transparent qualifications is not worse than one without them; it at least shows which decision is still outstanding. Bloomcabin provides a five-year manufacturer guarantee for windows and doors. Expected delivery is four to six weeks, subject to order confirmation. Neither statement replaces checking which dates, services and conditions apply to your own quote and order confirmation.
Manage changes, surveys and order confirmation
The best quote review loses value if changes are later passed on only verbally. Keep a change list with date, item identifier, reason, previous description, new description and approval status. This helps when a dimension is corrected at survey, a handing is reversed or glazing is adjusted. Before ordering, ask which documents form part of the order confirmation: quote, drawings, survey sheet, colour specification and accessory list should refer to one another. Compare the confirmation again with your checking sheet. With several nearly identical units, an item assignment can otherwise shift unnoticed. Do not check altered amounts only. A change to one unit can affect adjacent items, such as a coupling, sidelight or installation scope. Ask for the complete new version rather than assembling individual corrections from several emails. Clearly archive superseded versions as not approved.
For example, an outward-opening folding-door system should not be confirmed only as a “large door set”. Record leaf arrangement, opening side, drawing version and the corresponding building opening. The same principle applies to every standard window. Agree who will answer open points by when, and from which point changes may affect price or programme. If an issue is undecided, “still open” is better than an assumption in conversation. Approve only when the product description and site assumptions fit together. This makes the order confirmation a controlled continuation of the quote rather than a document first revisited on delivery.
Frequently asked questions
Is it enough if both quotes list the same number of windows?
No. The number is only a check figure. Compare, for every opening, dimensions and their reference basis, unit type, opening direction, glazing, fittings and installation. Two quotes with ten windows can include different leaf arrangements, fixed glazing or removal work. An item-by-item list shows whether the same ten openings have actually been allowed for.
What should I do with a lump-sum installation item?
Ask for a written breakdown of the scope. In particular, clarify removal, fixing, connection work, sealing, trims, protective measures and disposal. The aim is not to price every site uncertainty, but to understand included services, exclusions and the process for additional findings clearly.
Are different product names automatically not comparable?
Not automatically, but they are a reason to investigate. Compare the configuration and use actually described, not just the heading. Where names differ, ask for details of opening type, number of leaves, glazing, equipment and drawing. An alternative should appear separately so that the price difference remains understandable.
Should I clarify open points before or after the survey?
Clarify in advance every decision affecting construction, use or pricing basis. The final dimension can be confirmed only at the agreed survey. Document what may still change as a result, who will be informed and when you approve the adjusted item. This keeps survey changes traceable.
How do I compare quotes with different overall scope?
First create a shared base total from identical, clearly described items. Then list additional work, options and exclusions separately. Next decide whether you deliberately want to split services or prefer a more comprehensive package. A lower total is not a saving if required work is missing.
Next step
A good window or door quote answers the same questions for every item: what is delivered, where is it installed, how does it operate, what belongs to installation, and what remains open? Compare identifier by identifier rather than heading against heading. Prioritise completeness and correct allocation first, then usability and connection work, and only then the cleaned total in EUR. Open points are not a flaw as long as they remain visible and are resolved before approval. Take your checking sheet to the order-confirmation and survey appointments too. This turns a price comparison into a coordinated procurement process for the entire project.
