Contemporary Glass Extensions UK
Frameless Glass Extensions: Sleek, Minimalist Modern Design
Ultra-slim structural glazing creates a seamless link between your home and garden, featuring floor-to-ceiling glass and striking contemporary design
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Price From
£40,000
Build Time
12-16 Weeks
Thermal Rating
A++ Rated
Guarantee
10 Years
From £40,000
What is a Glass Box Extension?
A glass box extension exemplifies contemporary architectural design. Using structural glazing technology, these minimalist extensions create an almost seamless boundary between your living space and garden.
At Clc Home, we specialise in bespoke glass box extensions with floor-to-ceiling glass panels, flat structural glass roofs, and large-format sliding or pivot doors. Each installation is precision-engineered to deliver a seamless indoor-outdoor living experience.
Key Benefits
- Maximum natural light
- Seamless indoor-outdoor living
- Seamless indoor-outdoor living
- Structural engineering included
- Contemporary aesthetic
- Large-format sliding doors
- Full planning support included
Premium Features
Glass Box Extension Features
Every glass box extension is precision-engineered using premium structural glazing and cutting-edge thermal technology.
Frameless Structural Glazing
Built with structural safety glass and supported by structural glass purlins, sealed using specialist structural silicone bonding techniques.
Floor-to-Ceiling Glass
Full-height glazing maximises views and floods your space with natural light.
Sliding & Pivot Doors
Choose from large-format sliding, pivot or bi-fold doors for dramatic openings.
Walk-On Glass Roofs
Optional glass roofs create stunning visual connections between floors.
Door Options
Door & Opening Options
Choose from a range of premium door systems to complete your glass box extension.
Sliding Glass Doors
- Up to 6m opening width
- Ultra-slim profiles
- Flush floor tracks
Pivot Doors
- Up to 3m height
- Hidden pivot mechanism
- Dramatic entrance
Bi-Fold Doors
- Multiple panel options
- Full corner opening
- Low threshold
Expert Answers
Glass Box Extension FAQs UK
Common questions about glass box extension costs, planning and installation in the UK.
A glass box extension is a minimalist architectural addition using structural glazing. It creates an almost invisible boundary between your living space and garden, maximising natural light and views.
A frameless glass box extension typically ranges from £40,000 to £100,000+, depending on size, glass specification, and complexity. Clc Home offers premium glass extensions from £40,000, fully installed with building control approval and a 10-year guarantee.
Many glass extensions fall under Permitted Development Rights, though restrictions apply in conservation areas and on listed buildings. Clc Home provides full planning guidance with every project.
Yes. Our glass box extensions feature New Generation Glass technology with advanced thermal breaks and low‑e coatings, achieving A++ energy ratings. They keep you warm in winter and cool in summer.
A typical glass box extension takes 12‑16 weeks from initial consultation to completion, including design, structural engineering, foundations, installation and finishing.