A high-spec glazed apex with a steel frame clad with Accoya and Cotswold stone side extension in Broadway — praised by the building-control inspector as "the highest-spec and most well-built extension I have ever seen".
Broadway — May 2026 Project in Broadway is one of the most accomplished extension projects P&R Mueller has completed — a combination of a dramatic glazed apex extension with a steel frame clad with Accoya and a beautifully crafted Cotswold stone side extension, delivered to a standard that drew exceptional praise from building control. The project demonstrates what is achievable when outstanding materials, meticulous detailing, and experienced craftsmanship come together on a single site.
A Steel-Framed, Accoya-Clad Extension of Exceptional Quality
The centrepiece of the Broadway — May 2026 Project project is a glazed extension with a dramatic apex gable — a full-height triangle of glazing set within a steel frame clad with Accoya, flanked by full-height French doors. From the garden, the warm tone of the Accoya against the existing Cotswold stone creates a composition that is at once contemporary and completely in keeping with the character of the house and its Broadway setting.
Accoya was chosen because it is more dimensionally stable than oak and less subject to cracking and twisting, which is particularly important where the frame interfaces with glass. The result is an extension that reads as a single architectural statement rather than an addition.
A Cotswold Stone Side Extension to Match
Running alongside the main structure, a Cotswold stone side extension provides additional accommodation while maintaining the traditional character of the house. The stonework was carefully specified and laid to match the colour, coursing, and texture of the original building — a level of attention to detail that is essential in Broadway, one of the Cotswolds' most architecturally sensitive villages.
Traditional leaded-light windows and a natural stone roof tile complete the exterior, ensuring the extension sits seamlessly within the existing fabric of the property and the wider conservation area setting.
A Dramatic Vaulted Interior
Inside the glazed extension, the full drama of the structure becomes clear. The vaulted ceiling rises to the apex of the frame, with the triangular glazed gable flooding the space with natural light. An exposed Cotswold stone wall — retained and finished from the original external elevation — forms one side of the room, giving the interior a raw, textural warmth that works beautifully alongside the precision of the glazing and the wide-plank oak flooring.
The French doors open directly to the garden terrace, connecting the new living space to the landscaped grounds and creating a seamless indoor-outdoor flow throughout the warmer months.
“The highest-spec and most well-built extension I have ever seen.”— Building Control Inspector
Beautifully Finished Throughout
The interior living spaces were fitted out to the same exceptional standard as the structure itself. A substantial fireplace with a natural stone surround — detailed in travertine — anchors the main living area, balanced by wide-plank oak flooring and crisp, neutral plastered walls that allow the architectural elements to speak for themselves. The vaulted ceiling, visible throughout the space, reinforces the sense of volume and light that makes the extension so successful as a living environment.
Every room in the extension — from the main living area to the sitting room — was finished to a level that reflects the ambition of the project from the outset. This is the standard P&R Mueller brings to every extension it undertakes: not just building, but building exceptionally well. If you are planning an extension in Worcestershire, Warwickshire, or Gloucestershire and want the same level of craftsmanship, we would be delighted to hear from you.
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Frequently Asked Questions
What is a steel-framed, Accoya-clad extension and how does it differ from a standard extension?
At Broadway — May 2026 Project, the glazed apex uses a steel frame clad with Accoya. Accoya was chosen because it is more dimensionally stable than oak and less subject to cracking and twisting, which is particularly important where the frame interfaces with glass.
Can a steel-framed, Accoya-clad extension be built on a Cotswold stone house in a conservation area?
At Broadway — May 2026 Project in Broadway, the glazed apex uses a steel frame clad with Accoya alongside the Cotswold stone of the main house.
How long does an extension of this type and standard take to complete?
A project of the scale and specification of Broadway — May 2026 Project — combining a glazed apex with a steel frame clad with Accoya, a Cotswold stone side extension and a high-quality interior fit-out — will typically take 6 to 12 months from start of works on site. The programme includes the structural works, the frame and cladding, the masonry, the glazing installation, services, plastering, and the full interior fit-out including oak flooring, joinery, and decoration.
What made the building-control inspector call the Broadway — May 2026 Project extension "the highest-spec and most well-built extension I have ever seen"?
Building-control inspectors assess compliance with Building Regulations across hundreds of projects. When the inspector described Broadway — May 2026 Project as 'the highest-spec and most well-built extension I have ever seen', it reflected not just compliance but the overall standard of workmanship — the quality of the structural connections, insulation detailing, precision of the joinery, and care taken at every stage of the build. That standard is what P&R Mueller sets out to achieve on every project.
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