Slim Sliding Doors to Marylebone Rooftop | Wimpole Street Case Study | minimal windows®

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Projects
Roof Extensions
Wimpole Street, Marylebone

Wimpole Street is one of Marylebone’s most distinctive architecturally rich avenues, lined with elegant Georgian terraces that rise five storeys and culminate in a traditional mansard profile. Within one such Grade II listed townhouse, the upper three storeys were transformed into a refined London residence through a sensitive yet ambitious reconfiguration by Robert Dye Architects. A new rooftop level was introduced, forming a private external terrace and creating a serene urban escape at the top of the home.

The introduction of slim sliding doors to the Marylebone rooftop was central to achieving this transformation. The chosen minimal windows® system opens the new mansard level to the outdoors, allowing daylight to reach the interior while maintaining complete visual discretion from street level. This contemporary intervention brings clarity, calmness and modernity to a historically layered structure.

Products Used

Project Partners

Architect: Robert Dye Architects

Installer: IQ Glass

Contractor: ShipShape Construction Ltd

Structural Engineer: Greig Ling

Quantity Surveyor: Nigel Ray Associates

Location

Wimpole Street, Marylebone, London

luxury private residential roof garden with a walk on glass floorlight and sliding glass balcony doors

Reimagining a Historic London Maisonette With Rooftop Living

The architectural intent for Wimpole Street was to modernise the existing maisonette while respecting its heritage context. The clients envisioned a home that combined the elegance of Georgian architecture with the openness, brightness and spatial flow typical of contemporary living. Robert Dye Architects’ response was to reorganise the property vertically, introducing a new circulation void that connects the upper floors and opening the plan to increase legibility and natural light.

The new mansard level became the cornerstone of this vision. Research into the property’s past revealed that a floor had once been added during the 1980s but did not align with the building’s spatial logic. The remodelling effort corrected this by creating an upper level conceived as a single living floor, complete with kitchenette and direct access to the rooftop space. The slim framed sliding doors were chosen to define this connection, ensuring the terrace felt seamlessly tied to the internal living areas.

Designing for Heritage Constraints, Structural Reorganisation and Light

Working within a Grade II listed home demanded a careful balance between architectural ambition and heritage sensitivity. The street-facing façade needed to remain unchanged, meaning the new rooftop could not break the established silhouette along Wimpole Street. The architects retained the front mansard slope to preserve the traditional roofline while opening the flat roof behind it to reveal a sheltered terrace. This approach allowed the home to gain valuable outdoor space without altering its historic presence.

The existing internal arrangement also presented challenges. The staircase had been awkwardly configured during a previous intervention, creating disconnection between floors and blocking daylight. Reorganising this circulation was essential to establish a cohesive vertical flow, culminating in the new rooftop level as the natural destination of the home. The glazed doors played a key role in drawing light downward through the stair void, helping unify the sequence of interior spaces.

How minimal windows® Delivered Slim Sliding Doors for the Marylebone Rooftop Renovation

The minimal windows® sliding door system provided the clarity, refinement and performance required for this sensitive heritage project. The rooftop terrace is accessed via a four track, four panel sliding system, measuring 5.8m wide and 2.6m high, with all panels sliding for maximum flexibility. This configuration allows the opening to be tailored to changing weather and privacy needs, while the slim aluminium framing maintains a clean and understated appearance.

The slim sightlines ensure the doors visually recede, allowing the architecture, views and daylight to take precedence. The double-glazed units incorporate a low e coating and solar control layer, critical for moderating heat gain in a south facing London rooftop environment. The flush threshold supports unrestricted movement between indoor and outdoor spaces and helps to strengthen the calm, contemporary atmosphere of the rooftop living area.

The rooftop glazing forms part of a wider bespoke package from IQ Glass, which also included eaves glazing and two walk on rooflights. One rooflight features switchable privacy glass, providing adaptable privacy without compromising the design intent.

A Marylebone Home Elevated by Slim Sliding Doors and a Sculpted Rooftop Space

The completed renovation at Wimpole Street showcases how contemporary glazing can enhance the character and functionality of a historic London property. The use of slim sliding doors to Marylebone rooftop enabled the clients to gain a rare private outdoor space in a dense urban context while fostering light, openness and architectural clarity across the home.

The project has been celebrated for its spatial intelligence and its ability to blend heritage sensitivity with modern living. For architects, developers or UHNW clients looking to incorporate high specification glazing into constrained or historically significant London sites, Wimpole Street demonstrates the precision and design synergy that minimal windows® systems can offer.

To explore how minimal windows® can elevate rooftop extensions or heritage renovations, our technical team is available to support with specification, detailing and performance advice.

Technical Details

System: Four track, four panel slim sliding door system

Size: 5.8m wide x 2.6m high

Operation: All panels sliding

Glass: Double glazed with low e coating and solar control coating

Finish: Aluminium framing to project specification

Locking: Type 2 thrust lever handles at each end

Threshold: Standard minimal windows® flush threshold

Additional glazing: Eaves window and two walk on rooflights, including one with switchable privacy glass

To discuss slim sliding doors for rooftop extensions or heritage renovations, contact the IQ Glass technical team for early-stage design, specification and detailing support.

Associated Products

Switchable Privacy Glass

Switchable privacy glass, also known as smart glass, can be used in various applications such as windows, doors, partitions, skylights, mirrors, and electronic displays, providing privacy, energy efficiency, and aesthetic benefits.