Our Vision: Building Social Value through Double Glazing
At Cosyseal, we believe that every piece of work we do should contribute to the betterment of local communities and society as a whole. This conviction forms the very core of our company philosophy. We have set ambitious goals and actively measure and assess our impact on the communities we serve.
Our Expertise: Delivering Quality & Value
For over three decades, Cosyseal has provided unmatched double glazing installation and repair services to Housing Association clients across London and the Home Counties. We specialize in reactive and planned window and door projects for social housing clients throughout the region.
Our Services
- Window Replacement: Upgrade your property with high-quality uPVC, aluminium or timber windows.
- Window Repair: Restore drafty or faulty windows to their former glory.
- Secondary Glazing: Enhance the energy efficiency of your existing windows without replacing them entirely.
- Double Glazing Repair: Fix leaks, drafts, and misting issues in your double glazed windows.
- Window Maintenance Contracts: Regular inspections and maintenance to keep your windows in optimal condition.
Our Values
Our work is guided by core values that underpin our commitment to delivering exceptional service and creating lasting value for our clients and the community. These values are:
- Partnership: We work in close collaboration with our clients, understanding their unique needs and goals.
- Commitment: We nurture and maintain strong working relationships with our clients, fostering trust and open communication.
- Respect: We conduct our business with integrity and honesty, treating our clients and partners with fairness and professionalism.
- Investment: We invest in our people, providing them with continuous training and development opportunities.
- Social Responsibility: We take environmental sustainability seriously, prioritizing local sourcing, recycling, and energy efficiency.
Join Us in Building a Better Future
Cosyseal is committed to building social value through its work. We actively engage in community initiatives and work with local organizations to create positive change. Join us on this journey by partnering with us for your window and door needs.
Overall Experience
The majority of customers had an excellent experience with Cosyseal, praising their professional and polite workforce, efficient service, and high-quality workmanship.
Praises for the Workforce
Many reviewers appreciated the friendliness, professionalism, and proficiency of the Cosyseal team, including the fitters, engineers, and customer service team. They were praised for their punctuality, tidiness, and attention to detail.
Efficient Service
Several reviewers commended Cosyseal's efficient service, with many commenting on the speed and quality of the work carried out. Some mentioned that the team completed the work quickly, despite the challenges posed by the weather.
Quality of Work
The quality of the work carried out by Cosyseal was highly praised, with many reviewers expressing their satisfaction with the finished product. The new windows and doors installed by Cosyseal were described as "amazing" and of "high quality".
Communication
Cosyseal's communication was also praised, with many reviewers appreciating the regular updates provided throughout the installation process.
Negative Experiences
A few reviewers, however, had a poor experience with Cosyseal, citing issues with customer service, unprofessional behavior from some staff members, and delays in completing the work.

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