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Exterior Plas has provided reactive window maintenance in London since 2007, an extension of manufacturing and installation work that began in 1988. What started as a small operation producing fascia and soffits has grown into a full window and door manufacturer with a dedicated maintenance division, working across London and the South East for councils, housing associations, the education sector and private clients alike.
Widely trusted as double glazing maintenance specialists in London, our engineers are trained to handle a range of window and door systems, so a single call can cover most faults without needing to bring in a specialist elsewhere. We provide both residential and commercial window and door maintenance in London, with flexible solutions for occasional repairs for immediate needs or portfolio-wide framework upkeep.
Not every repair fits a fixed schedule, and our work around reactive window maintenance in London includes ad hoc or void contracts with varying work quotas. We handle single call-outs and void repairs alongside larger contracts covering an entire borough or housing association’s stock. Whether you need to fix a single broken handle or a failed seal, or manage multi-property repair work, our team will provide the best solutions at the right time.
Appointments can be pre-booked according to your schedule or logged as they arise. Our window repair services can be scaled up or down as needed at any time.
Every job is logged through our AGS software, which allows our repairs team to allocate an engineer quickly and gives clients real-time visibility of progress with photographic evidence once work is complete. This structure allows us to maintain a first-time fix rate of over 70%, which, for a facilities team managing multiple properties, means fewer follow-up visits and less disruption to occupiers.
For clients who want to get ahead of repairs early on with a solid preventive approach, our cyclical programme for window and door maintenance in London involves yearly checks across all windows and doors, including adjustment, alignment and lubrication of moving parts.
This kind of scheduled attention catches minor issues before they become expensive ones and can extend the working life of uPVC windows by up to 20 years. For any client managing a maintenance budget, that shift from unpredictable reactive spending to a planned annual programme is often a more useful outcome than the repair itself.
We also take on private repairs directly, without a managing agent or framework in between. If a window is letting in draughts, a double-glazed unit has misted over, or a door has become difficult to lock or open, our team can usually resolve it in a single visit. We also offer glass upgrades at this stage, including options for reduced noise transfer, reduced heat gain, or easier cleaning, when a client wants to improve on what is already there rather than simply repair it.
Every repair we carry out is backed by decades of door and window manufacturing and installation experience, which means our engineers understand how a window or door is built, not just how to patch a fault. That background shapes how we assess and resolve a problem: looking for the underlying cause rather than a temporary workaround.
Exterior Plas holds accreditation through FENSA, CHAS, Constructionline, and Safe Contractor, alongside Cyber Essentials certification, which allows us to work as double glazing maintenance specialists in London, directly within the procurement requirements of councils and housing associations. Whether a client needs a single repair or an ongoing framework, the process stays the same: a fast response, clear reporting, and a fix that holds.
Our engineers are trained across all major window and door systems, with expertise in double glazing maintenance specialists in London. So if a call-out reveals something beyond the original scope, such as a fault affecting the surrounding frame, it can usually be assessed and addressed on the same visit rather than requiring a separate appointment.
Yes. Where a client wants to improve on what’s already there, we offer glass upgrade options at the point of repair, including reduced noise transfer, less heat gain or easier cleaning, rather than defaulting to a straight replacement of the original unit.