Compare window and door quotes, item by item
Window and door purchasing advice
At a glance, two quotations can seem to cover one renovation while pricing materially different jobs. One supplier may write “complete windows”; another may separate units, junction work, disposal and interior finishing, while a third may leave some of these out. Treat the EUR total as the result of the specification, not the starting point. Set each quotation against a schedule of openings. For every entry, identify the room, dimensions, opening action, contents of the unit price and work reserved for the site. This matters particularly when a project combines windows with patio and entrance doors, because an attractive line price can mask an omission. You do not need the most elaborate document. You need boundaries clear enough to verify exactly what will be ordered, delivered and fitted.
01 / Gather documents
Start with one shared checking sheet
Begin by assigning a reference to each opening from the plans or site survey—for example, GF-W01 for the kitchen window and FF-D02 for the balcony door. Add its room, unit count, width, height, intended function and relevant features, including reveals, shutters, cills and nearby furniture. Match every supplier entry to this reference. A grouped allowance such as “ground-floor windows” is useful only when an accompanying schedule identifies every opening. Otherwise, request a revised breakdown. This exercise exposes differences such as three units being allowed by one supplier and four by another, or fixed glass being mistaken for an operable window.
Give both suppliers an identical column set: your reference, their item number, quantity, dimensions, construction, opening method, glass, finish, ironmongery, accessories, removal, fitting and price basis. Label every detail confirmed, assumed or unresolved. A window with one inward-opening leaf cannot be matched safely with an entry saying only “casement” until its action and direction are settled, even if the dimensions look similar. This worksheet does not replace design work; its purpose is to turn vague descriptions into points that can be verified. Keep each supplier’s reference and place your opening code beside it. Queries, revisions and the eventual order confirmation can then be traced to the correct component.
Reading dimensions correctly: opening, unit and reference plane
Numbers are meaningful only when their reference is stated. Ask whether the quoted width and height describe the masonry opening, outside of the frame, manufacturing size, clear passage or another plane. “1000 × 1200 mm” does not settle that question. Confirm which dimension comes first, whether millimetres or metres are used, and whether joint allowances have already been deducted. Put the quantity beside the dimensions whenever identical windows recur. If a size is described as “approximate”, establish who will complete the binding survey and which entries may then be revised.
Consider unusual dimensional cases separately. A fixed-glazed triangular or sloping window also requires a clear shape sketch or an unmistakable drawing reference alongside its external dimensions. Door information should distinguish outside frame dimensions, usable passage width and the threshold zone instead of combining them loosely. Cross-check the elevation because an accurate size may still be attached to the wrong room. Your own measurement should not replace professional responsibility for an order. Confirm instead who owns the final survey, when it will occur and whether preceding work such as plastering, floor construction or sealing must be finished first.
02 / Match the items
Compare unit types and opening directions without shortcuts
“Window” alone reveals little about construction or operation. For each opening, specify fixed glazing, one leaf or two leaves and the intended action. An inward swing and an outward swing demand different clear space and affect use inside the room or outside on a patio or balcony. Where an elevation indicates the action but the written entry does not, obtain written confirmation linking both documents. Handing must also be checked from an agreed viewpoint. A notation such as “DIN left” can remain ambiguous unless the supplier provides a view showing exactly what left means.
With a broad opening, practical movement and access may outweigh the cost shown on an individual entry. A Patio Life lift-and-slide patio door does not work like a conventional hinged door, so glass area and overall area are insufficient comparison points. Identify every moving leaf, the route people will normally use and whether the current drawing works with furniture, circulation and the exterior space. For two-leaf doors, record the principal operating leaf. A proposed substitute belongs on a separate alternative entry rather than silently taking the place of another construction. This shows whether the reduced figure represents a genuine saving or simply prices a different way of using the opening.
Assess glazing and appearance separately
Do not let the glazing specification disappear into a generic description. Each opening should identify the glass proposed, the visible result required and any special need arising from the design or use. Performance figures can be compared only when their reference is identical: a glass-only figure and a whole-unit figure describe different things. Establish whether one specification applies throughout or whether the bathroom, stairs, ground floor and roof openings differ. Unresolved glass choices can alter daylight, privacy, appearance and cost, so they should remain visible rather than being treated as a minor finishing decision.
Glazing bars need precise treatment too. Distinguish decorative bars fitted to the surface from bars that physically separate panes. State “no glazing bars” where photographs or visualisations might otherwise create a different expectation. A fixed-glazed window provides an uninterrupted expanse of glass but cannot perform the ventilation role of an opening sash. Consider large fixed panes together with the operable windows serving that room, rather than rewarding a proposal simply for showing more glass. Add item references to elevations wherever possible. You can then reconcile the proposed subdivisions, opening leaves and bar layout with the façade that was discussed.
03 / Check the specification
Define fittings, operation and visible features
Disputes often concern the parts handled every day rather than the frame itself. For each entry, record the handle style, colour and position, restrictors, locking choices, ventilation settings and any other operating requirement. “Standard hardware” does not provide enough information for a fair test because its contents remain undefined. Confirm which window leaves operate and how each control is intended to be used. High openings also need a practical operating method. The selected arrangement should work in the actual room, not merely resemble a display model or carry a familiar product name.
A window hinged at the top and opening outwards can suit a different ventilation pattern and method of use from one hinged at the side. Make sure both the wording and elevation record that decision consistently. Door entries should similarly cover lever or pull handles, the locking side, closers and any other visible equipment, either directly or through a specific attachment reference. A fully detailed allowance cannot be assessed fairly against an undefined package. If hardware will be chosen later, establish who decides and how the allowance is set. Without that record, there is no reliable way to tell whether the competing totals represent an equal functional and visual result.
Check doors beyond the door leaf
An external or patio-door entry covers considerably more than its operable panel. Account for the frame, threshold, sidelights, fanlights, action, handle location and any junction with adjacent glazing. A panelled entrance door that opens outwards must be entered with that full configuration; its short name does not imply any additional feature. Pay close attention to where the door meets the floor construction. Ask which levels were assumed in the price and who must verify them before manufacture. A sidelight shown only on a sketch remains unresolved unless the pricing schedule expressly includes it. Establish which document governs if drawings conflict. When the internal view, external view and written quotation differ, do not choose whichever interpretation looks cheapest or most detailed. Require a corrected drawing for the affected entry and obtain confirmation of the revised version.
Patio doors also require a look at the route outside. A one-leaf patio door opening into the room uses indoor floor area, while a door swinging out requires an unobstructed arc externally. Test the handing against furniture, curtains, guarding and paving, but do not infer details that the sketch does not contain. For linked components, the schedule should show both their connection and division. Replace a vague note such as “confirm door details” with direct questions: “Does the price include the sidelight?”, “Which view governs?” and “Does this entry cover the threshold?” Focused questions produce dependable revisions and are more useful than asking generally for everything to be included.
04 / Define installation
Break installation down into individual tasks
A supply-only unit and a completed installation are not like-for-like purchases. Identify delivery, removal of existing components, preparation of the opening, placement, mechanical fixing, junction treatment, sealing, trims and finishing on both sides. “Installation” may mean no more than placing and securing the replacement, whereas another supplier may price several surrounding tasks. The broader entry is not necessarily preferable; it must suit the planned sequence of work. For every lump sum, request a concise scope. A lengthy standards essay is unnecessary, but the document must separate the fitting crew’s duties from work that the customer or another trade must complete.
Resolve trade boundaries at an early stage. Identify who removes old cills, repairs damaged reveals, coordinates junctions with insulation, plaster or façade works, and leaves the opening ready for following trades. A lower fitting allowance may be reasonable when preparation or making-good is intentionally placed elsewhere, but it cannot be assessed as though it covered the fuller package. Access also belongs in the record: floor level, carrying route, protection for finishes and working clearance can all affect the programme. Put these matters in writing before commitment instead of waiting until the delivery crew arrives and discovering that each party made a different assumption.
Make ancillary services and exclusions visible
Ancillary work often explains the gap between headline figures. Search each proposal for packing, transport, unloading, protection of the site, waste removal, scaffolding, lifting plant, coverings and final cleaning. A word appearing once is not enough; its extent and the responsible party must be identifiable. For instance, “waste removal” might cover the old units but exclude broken plaster or other material from the reveals. Another supplier’s package might absorb small site tasks that are priced individually elsewhere. Add three statuses to the worksheet: included, excluded and unresolved. Beside every unresolved matter, note its consequence—another contract, work by the customer, programme coordination or uncertain expenditure. This prevents a minor cleaning omission from receiving the same importance as lifting equipment whose absence could stop the installation.
Unusual building forms need their own entries rather than being absorbed into a general window line. A centre-pivot roof window presents different site work from an upright façade unit, so their fitting allowances should be aligned only where the described operations genuinely coincide. Apply the same care to non-standard shapes, inaccessible openings and alterations to existing fabric. For every exclusion, establish what happens next: is another contractor needed, must the customer provide the work, or will the supplier charge according to time and materials? Avoid demanding a fictional fixed price for conditions hidden until removal. Instead, agree how unexpected findings will be recorded, discussed and authorised before extra work proceeds. That procedure gives both parties a clearer basis than leaving responsibility undefined.
05 / Check the confirmation
Compare discounts, options and pricing basis fairly
Options and committed work must not be allowed to blur together. Classify each entry as part of the offer, a substitute, an optional addition or absent. A removable allowance cannot sit in the same comparison figure as work already selected. Start with an adjusted core total covering only equally specified items offered by both suppliers; list desired options afterwards. Volume reductions, campaign pricing and prompt-payment deductions affect the payable amount but do not prove that the underlying scopes match. Confirm as well whether each figure includes or excludes VAT and that the treatment remains consistent across subtotals and totals.
Audit the arithmetic and the conditions behind it. Multiply each unit rate by its quantity and reconcile that result with the subtotal and final figure. Determine whether a reduction attaches to particular products or is taken from the closing total, and whether a later revision could remove it. Ask which survey details, selections or site assumptions remain outside the calculation. Clear qualifications are useful because they expose decisions still required. Bloomcabin’s commercial guarantee for windows and doors lasts five years. Indicative delivery is four to six weeks and remains subject to the confirmed order. Always verify the project-specific dates, scope and conditions in the quotation and subsequent confirmation.
Manage changes, surveys and order confirmation
A careful review is undermined when subsequent revisions exist only in conversations. Maintain a dated register showing the opening reference, reason, previous wording, replacement wording and approval status. Use it whenever a survey alters a dimension, reverses handing or changes the glass. Before purchase, identify every document incorporated into the confirmation. The quotation, drawings, survey record, colour decision and accessories schedule should cross-reference one another. Recheck the confirmation against your worksheet, since similar-looking units make a displaced reference easy to miss. Review more than price changes: one revision may also alter a neighbouring coupling, sidelight or fitting allowance. Request a complete updated set instead of constructing the current specification from scattered emails, and mark superseded versions clearly as unapproved.
An outward-swinging folding system, for instance, needs more precise confirmation than “large door arrangement”. Record the leaf pattern, side of operation, drawing revision and corresponding building opening. Use the same discipline for ordinary windows. Assign responsibility and a deadline for every unanswered question, and identify the stage after which a revision may alter cost or programme. Where no decision exists, label the matter unresolved rather than recording a conversational guess. Authorise the order only when the component description agrees with the assumptions about the site. The confirmation then becomes a verified next stage in procurement, not paperwork ignored until the goods arrive.
Common questions
Is it enough if both quotes list the same number of windows?
No. The count is only an initial cross-check. For every opening, reconcile the dimensional reference, construction, action, glass, hardware and fitting allowance. Two proposals can each mention ten windows while allowing different leaf arrangements, fixed panes or removal tasks. A referenced schedule confirms whether both suppliers have priced the same ten locations.
How should a single installation sum be checked?
Request a written description of everything covered. It should address removal, fixing, junction treatment, sealing, trims, protective measures and waste disposal. The aim is not to predict every concealed site condition, but to distinguish included duties, exclusions and the agreed method for handling new findings.
Do different product names automatically mean quotes are not comparable?
No, although the difference deserves investigation. Examine the stated construction and intended operation rather than relying on its heading. Ask for the action, leaf arrangement, glass, hardware and drawing where names diverge. Put any substitute on its own entry so its effect on price can be understood.
When should unresolved matters be settled in relation to the survey?
Settle choices governing design, operation or the charging basis beforehand. The agreed site survey may still be needed to confirm manufacturing dimensions. Record which information may consequently change, who receives the revision and when the amended entry requires approval. This creates a traceable route from surveyed dimensions to the final order.
What is the fairest way to assess quotations with unequal scopes?
Construct a common core figure using only equivalent, fully defined entries. Show extra tasks, selectable additions and omissions outside that figure. You can then decide whether separate contracts are intentional or whether the broader package offers better coordination. A smaller headline total brings no benefit if necessary work must still be purchased elsewhere.
Next step
A reliable proposal resolves five matters for each opening: the supplied component, its location, its operation, the fitting duties and any unresolved qualification. Work through opening references instead of comparing broad headings. First establish complete and accurate allocation; then consider usability and junction work before examining the adjusted EUR figure. A visible query is manageable when it is answered before authorisation. Bring the worksheet to the survey and use it again when reviewing the order confirmation. The exercise then becomes a coordinated procurement plan for the full project rather than a contest between two bottom-line prices.
