CASE STUDY
Swakleys Road
Products used
Replacement Aluminium Bay Windows, minimal windows® Sliding Doors, Solar Control Glass
Location
Swakleys Road
Completion date
Project Overview
Replacement bay windows and sliding doors were specified at Swakleys Road to address two distinct parts of a period home renovation. At the front, new aluminium bay windows recreate the character of the original openings and preserve the traditional appearance of the facade. At the rear, two large minimal sliding door systems open the living spaces to the garden and introduce significantly more natural light.
Sieger Systems coordinated the window and door package to provide contemporary performance without applying the same design treatment to every elevation. The result is a heritage-led frontage combined with a more open, modern garden elevation.
Project Challenges
Replacement bay windows and sliding doors for contrasting elevations
The principal challenge was to improve the functionality and performance of the home without weakening its established architectural character. The front elevation includes traditional bay windows, leaded glass detailing and exposed timber elements, so the replacement glazing needed to follow the proportions and appearance of the original windows rather than introduce an overtly contemporary system.
The rear elevation required a different response. The homeowners wanted larger openings, improved garden access and more daylight within the living areas. These requirements called for wide sliding glass assemblies with minimal framing, but the doors also needed to provide solar control, security and controlled ventilation.
The project therefore required two separate glazing approaches to be resolved within one renovation: heritage-sensitive replacement windows at the front and large-format sliding doors at the rear.
Project Solutions
Heritage bay windows and multi-track garden openings
New aluminium bay windows were designed for the front facade using leaded glass detailing and proportions that reflect the original openings. The aluminium construction improves durability and thermal performance while allowing the bay windows to retain the architectural rhythm of the period residence.
At the rear, Sieger Systems supplied two minimal sliding glass door assemblies. A three-track system measures 3780mm wide by 2590mm high and comprises a fixed pane on the left with two sliding panes. A larger four-track system measures 5485mm wide by 2590mm high, with a fixed pane on the right and three sliding panes. The multi-track arrangements allow the moving leaves to stack across the fixed glass, creating wide openings to the garden.
Both sliding systems were finished in RAL 9011 Matt and specified with SN70 solar control glass. Internal key locking provides security without adding external hardware, while slot aeration allows the doors to be secured in a partially open position for controlled ventilation. Detailed technical drawings, coordinated manufacture and planned delivery sequencing supported accurate installation of both the heritage windows and the larger rear glazing.
Project Highlight
The project uses two contrasting glazing strategies without compromising the architectural identity of the house. Replacement aluminium bay windows retain the traditional character of the front facade, while three-track and four-track sliding doors create a substantially more open relationship between the rear living spaces and garden.
End Result
Performance considerations
The replacement bay windows provide a more durable and thermally efficient alternative to the previous units while retaining the leaded glass character and established proportions of the front elevation.
At the rear, the minimal sliding systems combine slim 21mm junctions with tested air, water and wind performance. SN70 solar control glass helps reduce heat gain across the large glazed areas, while internal key locking maintains security without introducing visible external handles.
Slot aeration provides two secure ventilation positions, allowing background airflow without fully opening the doors. The RAL 9011 Matt finish coordinates the two rear assemblies and gives the garden elevation a consistent contemporary appearance.
Sieger’s conclusion
Swakleys Road demonstrates how replacement bay windows and sliding doors can respond independently to the heritage and contemporary requirements of the same property. The front windows preserve the architectural character of the period facade, while the rear sliding systems improve daylight, garden access and ventilation.
This approach is suited to architects, designers and homeowners renovating traditional properties where heritage-sensitive replacement glazing must be coordinated with larger contemporary openings.
To discuss a similar renovation, contact Sieger Systems for technical advice on replacement bay windows, multi-track sliding doors, solar control glass and heritage glazing coordination.
Original bay-window character retained
Wider openings created to the garden
Solar gain and ventilation controlled
Consistent RAL 9011 rear glazing finish
Technical specifications
| Replacement Aluminium Bay Windows | Aluminium replacement windows designed to reproduce the original bay-window proportions and leaded glass appearance while improving durability and thermal performance. |
| Three-Track Sliding Door | 3780mm wide × 2590mm high, configured with one fixed pane on the left and two sliding panes. The typical three-track system depth is 185mm. |
| Four-Track Sliding Door | 5485mm wide × 2590mm high, configured with one fixed pane on the right and three sliding panes. The typical four-track system depth is 250mm. |
| minimal windows® Sliding System | 21mm sightline, 26mm to 32mm glass thickness and tested sliding panes up to 8.5m², 4m high and 500kg. Typical Uw value greater than 1.1 W/m²K, calculated per project. |
| Sliding Door Performance | Air permeability Class 4, driving rain Class 7A, wind load Class C4/B5 and PAS 24 security. |
| Glass, Locking and Ventilation | SN70 solar control glass, internal key locking and slot aeration positions of 7mm and 27mm. Aluminium framing finished in RAL 9011 Matt. |
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