Replacing windows in an older London property can involve more than removing the frame and fitting a new unit. Contractors may disturb internal or external window panels, soffits, textured coatings, packers, sealants, boards and other materials around the opening. If those materials could contain asbestos, the asbestos information should be suitable for the exact work before removal begins.
That does not mean every window replacement automatically requires a completely new asbestos survey. The key question is whether reliable existing information already covers the window surrounds and any other building materials that will be drilled, cut, removed or opened up.
Can asbestos be found around windows?
Yes. HSE’s guidance on where asbestos can occur in buildings identifies asbestos insulating board (AIB) or asbestos cement panels around windows as potential locations. It also identifies soffits, fascias, textured coatings and other nearby building materials that may be relevant during replacement work.
HSE advises that asbestos can still be present in buildings built or refurbished before 2000. Visual appearance alone is not enough to confirm whether a material contains asbestos, because many asbestos and non-asbestos products can look similar.
Which materials may be disturbed during window replacement?
| Material or area | Why it may matter |
|---|---|
| Interior window panels | Older panels may be AIB or asbestos cement and can be disturbed during frame removal |
| Exterior window panels | Older external infill or cladding panels may contain asbestos |
| Soffits and fascias | Can be asbestos cement or AIB and may be affected by associated external works |
| Textured coatings | Window replacement can damage adjacent wall or ceiling finishes |
| Boards and packers | Concealed boards or packing pieces may only become visible when frames are removed |
| Adjacent service areas | Cable routes, ducts or boxing near openings may also contain ACMs |
For a broader overview, see our guide to asbestos-containing materials in UK buildings.
Is an existing management survey enough?
Sometimes it may be. A management survey can provide useful asbestos information for normal occupation and routine maintenance, but it is generally less intrusive than a refurbishment asbestos survey designed around planned intrusive work.
If window replacement will expose concealed panels, remove surrounding boards, open wall cavities or disturb parts of the building fabric that were not previously inspected, the existing management survey may not provide enough information for the planned work. In that situation, review the scope of a refurbishment asbestos survey in London before work starts.
HSE’s HSG264 survey guide explains that refurbishment surveys are intended to locate asbestos in the parts of a building that will be disturbed during planned work. The survey scope should therefore match the actual project rather than simply the property as a whole.
See our management survey vs refurbishment and demolition survey guide for the practical difference.
When might a refurbishment survey be needed?
A suitably scoped refurbishment survey may be appropriate where window replacement will disturb materials that have not already been adequately identified. The survey does not necessarily need to cover unrelated parts of the property; it should be designed around the areas affected by the work.
- Older internal or external window panels will be removed.
- Frames are being taken out back to the structural opening.
- Surrounding boards, cladding, soffits or fascias will be disturbed.
- Wall finishes or textured coatings need cutting or removal.
- Previous survey reports list the window areas as inaccessible or outside scope.
- The window project is part of a wider refurbishment programme.
If the window work forms part of a larger renovation, our asbestos survey before renovating a house in London guide provides a wider project checklist.
What should be checked before window contractors start?
- Any existing asbestos survey and asbestos register
- The exact windows, panels and surrounding finishes included in the project
- Whether the earlier survey inspected both internal and external window areas
- Any inaccessible or excluded areas recorded in the report
- Whether soffits, fascias, cladding or infill panels will also be removed
- Whether representative sampling is required
- Whether the contractor’s method will cut, drill or break suspect materials
Can targeted asbestos sampling be enough?
Where the concern relates to one clearly defined and safely accessible material, targeted sampling may sometimes answer a specific question. For example, a suspect panel beside a window may be sampled for laboratory analysis.
However, sampling one visible material is not a substitute for a properly scoped refurbishment survey if the project will expose several concealed areas or disturb a wider section of the building fabric.
Our asbestos testing guidance explains when targeted testing may be appropriate.
What if asbestos is found around the window?
Finding asbestos does not automatically mean the whole project must stop permanently or every asbestos-containing material must be removed. The next action depends on the type and condition of the material and whether the proposed work will disturb it.
Possible options can include altering the installation method, leaving an undisturbed ACM in place, arranging controlled removal before the window work starts, or using another appropriate method. Some higher-risk asbestos work requires an HSE-licensed contractor.
See our practical guide on what to do after asbestos is found in a survey.
Window replacement asbestos checklist
- Define exactly which windows and surrounding materials will be disturbed.
- Review existing asbestos information before the contractor starts.
- Check whether internal and external panels were included in the earlier survey.
- Do not treat inaccessible or uninspected areas as asbestos-free.
- Arrange targeted sampling or a refurbishment survey where appropriate.
- Provide relevant asbestos information to the window contractor.
- Stop work and reassess if an unexpected suspect material is uncovered.
- Update the asbestos register where relevant after removal or new findings.
Authoritative HSE guidance
HSE’s where asbestos can occur in buildings guidance identifies AIB or asbestos cement window panels, soffits, fascias and other materials that may be encountered during property work. HSE’s HSG264: Asbestos – The survey guide explains how surveys should be planned and how refurbishment surveys should be targeted to the parts of a building that will be disturbed.
This article provides general information rather than legal advice. The correct survey scope depends on the age and construction of the property, existing asbestos information and the exact work proposed.
Planning window replacement in London?
If you are replacing windows in an older London property and need to establish whether the existing asbestos information is suitable for the work, send us the property details and proposed scope. We can review the enquiry and provide a property-specific quotation.