20
Make an Enquiry

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

Get Your Glass Extension Quote
Download Brochure

Call us anytime on +447738237830

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
Request Free Quote

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.
 

Get Your Free Glass Extension Quote

Book a free home design consultation with our specialist team. We’ll discuss your vision, assess structural requirements and provide a detailed quotation.

Talk to a Service Specialist
Request Free Brochure

Call us anytime on +447738237830