
Define Your Home’s Character with Premium Windows & Doors
Windows and doors are more than openings — they shape light, security, and curb appeal. At Gosai Construction, we supply and install high-quality windows and doors that combine aesthetic with performance across London and Greater London.
Designed Around You
Choose from sash windows, double or triple glazing, skylights, dormer windows, or custom doors. We guide you through material, style, thermal performance, security, and finish options to suit both heritage and modern homes.
Why Choose Windows & Doors with Gosai?
- Wide range of styles: traditional, modern, heritage, custom
- High performance glazing for insulation, sound reduction, and security
- Energy-efficient doors & windows with strong weather sealing
- Full installation including frames, fittings, locks, and finishing details
- Fully certified, compliant with building regulations
Built to Last
We use premium materials, seasoned joinery, quality hardware, and expert fitting to prevent issues such as drafts, leaks, or warping. With every install, we focus on precision and durability to ensure long-term satisfaction.
Frequently asked questions
How long does it take to replace windows or doors?
Usually a few days to a week depending on the number, style, and whether frames need adjusting or structural work.
Do I need planning permission for windows & doors?
Generally not for like-for-like replacements. In conservation or listed areas, or when changing window types, approvals may be required — we help manage that.
What is the difference between double and triple glazing?
Triple glazing gives better insulation and sound reduction but can be more expensive. We advise on the best match for your location and budget.
How do I ensure weather tightness and security?
Proper installation, quality seals, hardware, and frames matter. We source high-grade components and inspect thoroughly.
Can replacement match heritage or period styles?
Yes — we can replicate sash windows or traditional doors with modern performance that respect heritage design.
Explore our portfolio of Windows & Doors
Each project was crafted with precision, creativity, and a commitment to exceptional quality. From the design to the hand over phase.