Glaziers: preparing a replacement glazing quote, 2026 guide

1. Identify the defect before proposing replacement

Ask what the customer has noticed: a crack, chip, misting, suspected leakage, discomfort or difficulty closing the window. Record when the problem occurs and where it appears. A photograph of condensation does not establish whether it is on the inner surface, outer surface or between the panes of an insulating glass unit. Keep observations separate from your conclusion and identify what needs further checking. A sales visit should not lead to improvised removal simply to resolve uncertainty.

Pilkington distinguishes these situations in its installer guidance. External condensation can relate to thermal conditions and the glazing’s efficiency, while misting between panes generally suggests a failure of the insulating unit’s seal. Internal condensation requires consideration of conditions including moisture and ventilation. These distinctions help direct the diagnosis; they do not justify promising that new glazing will resolve every moisture issue in the building.

Pilkington — Top tips for installers on window condensation

2. Separate the glazing, frame and surrounding work

Identify the assembly: an opening window, fixed light, glazed door, façade or another system. Record accessible glass and frame references, readable markings, retained parts and visibly damaged components. Examine seals, beads and finishes without assuming the condition of concealed areas. Replacing a glass unit in a retained frame has a different scope from replacing the whole window or repairing its connection to the wall.

Ask the supplier or technical lead to confirm that the retained system can accept the proposed solution. A change in thickness, specification or weight can affect the project’s requirements. Viracon’s documentation highlights component compatibility and drainage in its systems. Its instructions concern the products and configurations described: a setting-block example or technical value found there is not a universal rule for every window.

Viracon — Glazing guidelines

3. Record traceable measurements without inventing order sizes

Give each glazing unit a reference and use it on the sketch and photographs. Use consistent units, identify the viewing direction and distinguish the visible size, opening size and size of the component to be manufactured. Retain the measurements that were actually accessible, any differences found and areas not checked. A width measured between two visible parts must not automatically become the width of glass ordered, even if that approximation appeared to work on another job.

Confirm the final surveying method for the selected system and name the person who approves manufacturing dimensions. If a measurement requires preparatory work, plan that stage using suitable professional resources and explain its effect on the offer. The file must distinguish an estimate, a confirmation survey and an approved order. Avoid standard deductions or clearances selected from memory: the required characteristics and tolerances depend on the assembly and the applicable documentation.

4. Agree a specification that can be checked with the supplier

Describe the intended use and send the supplier the project constraints: location, dimensions, retained assembly, required performance and available information about the existing glazing. Have the full specification, thicknesses, any treatments, coatings and their orientation, and order references confirmed. A description such as high-performance double glazing is insufficient to distinguish solutions with different characteristics and integration requirements.

Safety, acoustic, solar-control and insulation functions are not interchangeable. A customer preference should become an explicit requirement to verify, not a promise inferred from how the glass looks. Keep the technical confirmation and the version of the supplier quotation used. Local requirements and those associated with the building’s use must still be checked by a competent person. This guide does not prescribe one mandatory glass type for every country.

5. Price access and handling before fixing the installation

Trace the route from delivery to installation: parking, entrance, corridors, stairs, usable lift, thresholds, corners and working area. Photograph constraints with their references, then confirm the dimensions and weight of the chosen product. Being able to enter a room does not prove that the glazing or handling equipment can pass through. Work on an upper floor and an installation directly accessible from ground level require different organisation.

Plan for trained professionals, suitable equipment and protection appropriate to the actual operation. Decisions about lifting, working at height and handling damaged glass belong to the company’s technical preparation. Do not turn the quotation into a removal tutorial. Also identify who clears access, protects belongings, arranges any temporary occupation and coordinates other trades. While an essential condition remains unresolved, retain a precise qualification rather than presenting a falsely final price.

6. Separate removal, protection, disposal and finishes

Describe what will be removed, what will remain and the finish expected. The quote can distinguish protection of the premises, work on existing components, handling, packaging, removal from site and cleaning. Verify the material-treatment arrangements for the particular job without claiming an unconfirmed disposal route or free service. A single replacement line can easily hide seal repairs, a bead needing replacement or paintwork the customer assumed was included.

Concealed areas require an agreed way to manage discoveries. Record visible defects and the limits of the initial inspection, then establish how additional repairs will be described and submitted to the customer before work begins. A qualification is not general permission to charge more. If another tradesperson repairs a support or finish, specify the expected result and sequence. Settle that coordination before promising when the assembly will be back in service.

7. Build the price using person-hours and comparable items

Separate glazing, accessories, transport, preparation, removal, installation, finishes and handover. Check what the supplier quotation actually includes: delivery, packaging or accessories may be included in one offer and absent from another. Use your own business costs and conditions. Do not apply a square-metre price found online to a job whose specification, handling requirements and interfaces have not yet been agreed.

Calculate labour using the number of people actually involved. Three hours on site for two professionals represents six person-hours. Add the survey, order preparation and other planned tasks separately, avoiding double counting. This unit helps establish workload; it is neither a standard replacement time nor a recommended labour rate. Present options on the same basis, clearly separating included work, alternatives and decisions still outstanding.

8. Check the order and delivery before the work

Bring the glass reference, approved dimensions, specification, treatments, required orientation, accessories and supplier reference together in a final record. Compare it with the accepted quotation and latest technical confirmation. Name who checks it and who sends the order. A customer change after approval should create an identified revision and a fresh check of its consequences, rather than an oral correction that becomes difficult to trace.

Arrange receipt and storage under the supplier’s instructions. Plan checks of references, quantities, documented dimensions and visible defects, together with a procedure for reporting discrepancies. Delivered glazing is not automatically glazing accepted for installation. Coordinate the actual availability of products, equipment and access before removing the existing unit. If a product is disputed, document the issue and have the appropriate contact confirm the next action.

9. Plan the handover and a useful follow-up

Plan the final professional checks and the explanations the customer needs. Identify retained references, applicable care documents, completed finishes and any outstanding reservations. For a condensation-related request, explain the phenomenon actually addressed and the limits of the original diagnosis. A new insulating glass unit does not justify a blanket guarantee about indoor humidity or every component of the frame.

When following up the quotation, ask for the missing decision: specification, option, finish, access or timing. Keep the survey, photographs, supplier confirmation and quotation revisions together. Want to reduce the time spent retyping observations and commercial documents? Discover Vocalys to prepare quotes and invoices by voice from your smartphone, then review references, quantities and conditions before sharing. Assisted drafting supports the glazier’s work; it does not approve the technical solution.

Reusable job sheet

• Observed defect and condensation location distinguished.
• Glazing, retained frame and interfaces identified.
• Sketches, photographs, references and accessible measurements recorded.
• Specification, orientation and order dimensions confirmed.
• Access, weight, handling and professional equipment checked.
• Removal, protection, disposal and finishes described separately.
• Person-hours, options and approval conditions made explicit.
• Delivery inspection, document handover and explanations planned.

Quotation outline: assembly and reference; observed defect; reference survey; approved specification; product and accessories; transport; access and handling; protection and removal; installation; interfaces and finishes; disposal; checking and handover; options; exclusions; points to confirm before ordering.

A reliable glazing quotation links the observed defect to a confirmed solution, then to clear resources and responsibilities. Approve the survey and specification before ordering, and keep the same reference in the offer, receiving record and completion file.