Slender Steel & Infinity Glass Extension, Cotswolds

Closeup view of frameless ‘infinity’ glass panels at the corner of the extension to create an ‘outdoors in’ sensation.

Harmonising Heritage and Horizon

Located in the Cotswolds, this project represents a sophisticated structural "back-knock" and extension designed to bring the outside in. By replacing a traditional rear elevation with a slender timber, glass, and steel structure, we realised a vision that prioritises light, reflection, and a profound connection to the south-facing gardens.

The Brief: A Seamless Connection

The initial brief provided by Matthew Clay Architects was to create a contemporary space that dissolved the boundaries between the home and the landscape. This was achieved through high-specification engineering and meticulous craftsmanship.

  • Infinity Glazing: Frameless ‘infinity’ glass panels were installed at the corners to blend reflection and light, ensuring the view remains unimpeded even in the winter months.
  • Slender Engineering: The use of a minimalist steel and timber framework allowed for over 8m of clear opening via floor-to-ceiling sliding doors.
  • Thermal Innovation: Despite the expansive double glazing, the extension remains thermally efficient thanks to airtight construction and an extensive sedum green roof.

The Sage Quality Constant: Built on Trust

This project was uniquely rooted in professional trust. Sage Developments was selected by a long-term architectural partner to execute this substantial transformation for a family member. Despite the site being 70 miles from our base, the Sage Quality Constant ensured a smooth journey through:

  • Remote Management: Executing complex structural works and extensive patio landscaping with total autonomy and professional foresight.
  • Complex Groundworks: Managing the demolition of the original rear structure and the grading for a wide-span flat roof and modern kitchen installation.
  • Internal Precision: Creating four distinct zones – kitchen, dining, garden room, and music space – within a single, unified open-plan footprint.

Technical Specification

  • Location: Cotswolds
  • Architect: Matthew Clay Architects
  • Glazing: 8m Sliding doors and frameless ‘infinity’ glass corners
  • Roofing: Substantial flat roof with integrated sedum green roof system
  • Specialist Features: Steel-frame construction and extensive porcelain patio works

The Result

A decade after completion, the Bagley Wood Road extension remains a landmark of contemporary residential design. It proves that when the project triangle of Client, Architect, and Contractor is built on a foundation of trust, the result is a legacy that remains unimpeachable.

"We were blown away by how this dream was realised through the quality of design and craftsmanship alike."

Wide exterior view of a slender timber, glass, and steel extension with over 8m of sliding doors opening to the garden.
Close-up of the contemporary kitchen extension featuring floor-to-ceiling glazing and a substantial flat roof.
Perspective view from the lawn showing how the open-plan extension integrates with the original property and its landscape.
Side profile of the Oxford extension highlighting the integrated sedum green roof for thermal efficiency.
Interior-to-exterior view from the kitchen, showcasing the seamless flow onto the external patio works.
Detail view of frameless ‘infinity’ glass panels at the corner of the extension to create an ‘outdoors in’ sensation.