What should businesses check in a curtain walling repair proposal?

A sound curtain walling repair proposal should give the business enough information to understand what is being repaired, why that method has been selected, what is excluded and how the work will be managed. The document should be specific to the building rather than relying on a generic description such as “make good glazing” or “replace damaged panels”.

Check that the proposal is based on a defined inspection. It should identify the affected elevation, bay, floor or grid reference, together with the visible symptoms and any relevant site observations. Useful supporting information may include photographs, marked-up elevation drawings or a concise survey summary. The proposal should distinguish between confirmed defects and matters that can only be established once components are opened up or removed.

This distinction is important because curtain walling problems are not always limited to the most visible damage. A failed sealed unit, for example, may be associated with damaged setting blocks, gaskets, pressure plates, cover caps, seals or adjacent framing. The proposal should state whether these associated items have been inspected and whether they are included in the recommended works.

Review the proposed method and its limitations. The document should explain whether the work involves glass replacement, removal and refitting of framing components, renewal of seals, adjustment of pressure plates, or another defined intervention. It should make clear why the selected method is considered suitable for the observed defect and whether it is intended as a local repair or part of a wider remedial scheme.

Where the cause of the defect is uncertain, the proposal should say so rather than presenting an assumption as a conclusion. It may identify further investigation as a separate stage, particularly where water ingress, movement or concealed deterioration could affect the final repair. A business should also check whether the proposal explains what happens if the initial findings differ from those available when it was prepared.

Check the specification of replacement components. A proposal should describe the replacement glass or other materials sufficiently for the business to confirm that they are appropriate for the existing curtain walling. Depending on the application, this may include the glass build-up, thickness, appearance, safety characteristics, thermal or solar performance, spacer arrangement and edge details. The document should also address compatibility with the existing frame, gaskets, sealants and drainage arrangements.

Appearance deserves particular attention on visible elevations. The proposal should indicate how the replacement is to be matched to the surrounding façade and whether differences in colour, reflection, coating or weathering may remain visible. If an exact visual match cannot be confirmed before manufacture, that qualification should be recorded clearly.

Look for clear boundaries of responsibility. Curtain walling repairs can involve interfaces with internal finishes, blinds, signage, electrical equipment, flooring, suspended ceilings and neighbouring façade elements. The proposal should identify which items are included, which must be removed or protected by others, and who will make good any disturbed finishes. It should also state whether the contractor is responsible for design development, technical checks or only for carrying out a defined repair method.

Exclusions should be as clear as the included works. Common points to clarify include concealed damage, asbestos-related procedures, specialist access equipment, out-of-hours working, internal decoration, replacement of unaffected panels and repairs to unrelated water-ingress paths. Vague exclusions can make two apparently similar quotations difficult to compare.

Examine the commercial terms in detail. The price should be linked to a stated scope and should identify whether it is fixed, estimated or subject to remeasurement. Any provisional sums, allowances, survey charges, disposal costs, specialist equipment charges and taxes should be shown separately where applicable. The business should also check the validity period of the quotation, payment stages, cancellation terms and the process for approving additional work.

A proposal should not make it necessary to infer the cost of an obvious element from a broad lump sum. It is reasonable to ask whether the price includes manufacture, delivery, removal of damaged materials, installation, sealing, protection and completion documentation. If several repair options are available, they should be described separately with their respective implications rather than combined into an unclear alternative.

Check that the programme is realistic and properly qualified. The proposal should set out the expected sequence, such as survey confirmation, ordering, manufacture, site preparation, installation and close-out. It should identify dependencies that could affect the programme, including material availability, approvals, access restrictions, tenant arrangements, weather-sensitive operations and the discovery of concealed defects.

For an occupied commercial property, the business should confirm how the proposed sequence fits around the building’s normal use. The proposal may need to address segregated work areas, protection of contents, delivery routes, noise or disruption, temporary loss of a window or façade panel, and coordination with the building manager. These operational details should be treated as part of the proposal rather than left entirely to site discussions.

Confirm how the repair will be accepted at completion. The proposal should state what checks will be undertaken once the work is finished and what information will be supplied to the client. Depending on the repair, this may include visual inspection, confirmation that components are secure and correctly seated, review of seals and drainage paths, photographs, product information and a record of any limitations or outstanding items.

It is also worth checking the terms covering workmanship and supplied components, including the duration and scope of any warranty or guarantee offered. The wording should explain what is covered, what could invalidate it and how a concern would be reported. A warranty should support a clearly defined scope; it should not be used to compensate for missing technical information.

GlassPlus UK recommends comparing proposals on completeness as well as headline price. A lower figure may reflect a narrower scope, less investigation or the exclusion of access and associated works. A well-prepared proposal enables the property owner, facilities manager and contractor to work from the same understanding, reducing uncertainty before a curtain walling repair is authorised.