PVC-u Vertical Sliding Sash Window - PVC-U Window
Verified by manufacturer today
BSI Kitemark
Certificate type
PAS 24
Certificate type
A traditional-style PVC-U vertical sliding sash window system offering authentic detailing, modern thermal performance, and secure, low-maintenance operation for heritage and new-build projects.
Application
The Vertical Sliding Sash Window is suitable for a wide range of architectural applications where traditional aesthetics, thermal performance, and secure operation are essential. Its authentic sash styling, robust PVC-U construction, and flexible configuration options make it a versatile solution for both new-build and refurbishment projects.
Heritage and Conservation Projects
Ideal for listed buildings, conservation areas, and heritage-sensitive developments, the Vertical Sliding Sash Window replicates the appearance of traditional timber sash windows while meeting modern performance standards. It is suitable for use in planning-restricted areas (subject to approval).
New-Build Residential Developments
For traditional-style homes, townhouses, and period-inspired developments, the system offers a high-specification solution that enhances façades with authentic detailing. Its thermal efficiency supports compliance with Part L of the Building Regulations.
Social Housing and Local Authority Projects
In high-volume housing schemes, the Vertical Sliding Sash Window provides a cost-effective, low-maintenance alternative to timber. Its PAS 24 and Secured by Design compliance ensures occupant safety, while its durable construction supports long-term performance.
Urban and Mixed-Use Buildings
For city-centre developments and regeneration schemes, this window system offers a traditional aesthetic that complements brick façades and classical detailing. Its wide colour range and compatibility with modern construction methods make it adaptable to a variety of design requirements.
Refurbishment and Retrofit Projects
Thanks to its traditional styling, flexible sizing, and wide colour palette, the system is an excellent choice for upgrading existing buildings. It can replace outdated timber sash windows while significantly improving thermal performance, security, and ease of maintenance.
Description
A Traditional PVC-U Sash Window System for Heritage and Period-Style Applications
The Vertical Sliding Sash Window is a high-performance PVC-U system designed to replicate the appearance of traditional timber box sash windows. Combining authentic period detailing with modern performance, it is ideal for use in heritage-sensitive areas, conservation zones, and traditional-style new-build developments.
Manufactured by Epwin Window Systems, this window system delivers excellent thermal efficiency, security, and ease of maintenance—making it a reliable solution for both refurbishment and new construction projects.
Design & Aesthetic Excellence
The Vertical Sliding Sash Window has been developed to closely mirror the proportions and features of classic timber sash windows. It includes a range of authentic design options to meet planning requirements and aesthetic expectations.
- Traditional ovolo detailing and deep bottom rail
- Optional run-through sash horns and Georgian or astragal bars
- Mechanically jointed or welded frame options
- Slim sightlines for enhanced visual appeal
- Available in over 30 colour options including woodgrain finishes
- Dual-colour options for internal/external contrast
- Tilt-in facility for safe internal cleaning
This attention to detail ensures suitability for conservation areas and heritage projects, while also enhancing the character of new-build homes.
Thermal Performance & Energy Efficiency
The system is designed to meet modern energy efficiency standards while maintaining traditional aesthetics. Its multi-chambered PVC-U profiles and advanced glazing options help reduce heat loss and improve occupant comfort.
- U-values as low as 1.3 W/m²K
- Multi-chambered profiles for improved insulation
- Glazing options: 24 mm double glazing or 36 mm triple glazing
- Optional recycled composite thermal inserts
- Co-extruded gaskets for airtightness
- Supports compliance with Approved Document L
These features contribute to reduced energy consumption and long-term sustainability.
Security & Compliance
The Vertical Sliding Sash Window is engineered to meet modern security standards while maintaining traditional styling. It is suitable for use in residential and public sector buildings where safety is a priority.
- PAS 24:2016 certified
- Secured by Design compliant
- Internally glazed for added security
- Optional restrictors for safe operation
- Compliant with Approved Documents Q (Security), L (Thermal), and M (Access)
This ensures the system meets the demands of current UK Building Regulations.
Durability & Low Maintenance
Manufactured from high-quality, lead-free PVC-U, the Vertical Sliding Sash Window offers long-term durability with minimal maintenance. Unlike timber, it does not require painting or regular upkeep.
- Weather-resistant and UV-stable
- Easy to clean and maintain
- Long service life with minimal upkeep
- Backed by manufacturer warranties
This makes it ideal for social housing, rental properties, and heritage buildings where ongoing maintenance must be minimised.
Construction & Configuration
- PVC-U vertical sliding sash window system
- 128 mm outer frame depth
- Welded or mechanically jointed options
- Tilt-in facility for safe internal cleaning
- Optional run-through horns and deep bottom rails
- Compatible with astragal bars and Georgian bar layouts
- Internally glazed as standard
This flexible construction allows the system to be tailored to a wide range of project requirements.
Sustainability
The Vertical Sliding Sash Window supports sustainable construction through responsible sourcing, recyclability, and energy-efficient performance.
- Recycled composite thermal inserts available
- Fully recyclable PVC-U profiles
- Manufactured in the UK to ISO 14001 environmental standards
- Supports BREEAM and other sustainability targets
Its long lifespan and low environmental impact make it a responsible choice for traditional and modern developments alike.
Applications
The Vertical Sliding Sash Window is suitable for:
- Heritage and conservation area developments (subject to planning approval)
- Traditional-style new-build housing
- Social housing and local authority projects
- Urban apartments and mixed-use buildings
- Refurbishment and retrofit schemes
- Public sector buildings such as schools and civic offices
Digital Specification Support
To support digital workflows and specification platforms, the Vertical Sliding Sash Window is available with:
- NBS Chorus-compatible specification data
- BIM object availability (Revit, IFC, DWG)
- COBie-compliant data
- Full technical documentation including datasheets, test reports, and installation guides
Why Specify the Vertical Sliding Sash Window?
- Traditional sash styling with ovolo detailing and deep bottom rails
- U-values as low as 1.3 W/m²K
- PAS 24 and Secured by Design compliant
- Tilt-in facility for safe internal cleaning
- Wide range of colours and finishes
- Durable, low-maintenance PVC-U construction
- Suitable for conservation areas and heritage projects
- Backed by Epwin’s technical support and warranties
General information
Color | Black Brown Cream Grey Blue Manufacturer guidanceColour swatch booklets are available upon request. |
Finish | Woodgrain Smooth |
Material | PVC-U |
Shape | Rectangle |
Width | 1200 mm |
Height | 1600 mm |
Warranty description | Ten year |
Uniclass | |
CAWS | L10/3 PVC-U windows L10/350 PVC-U windows |
Product range |
Specification data - Unplasticized polyvinyl chloride (PVC-U) window units
Classification data | |
Standard | To BS 6375-1 and BS 7412. |
Third-party certification | Kitemark™ Certificate to BS EN 12608. |
Dimensions and configurations | Manufacturer guidanceFully featured ovolo detail frames and sashes. |
Product performance | |
Fire performance | |
Fire resistance | None. |
Fire egress | None. |
Weather performance | |
UK exposure category | To BS 6375-1, 1600 Pa. |
Air permeability | To BS 6375-1, Class 3, 600 Pa. |
Watertightness | To BS 6375-1, Class 5A, 200 Pa. |
Resistance to wind load | To BS 6375-1, Class A4, 1600 Pa. |
Safety | |
Security level | To PAS 24. |
Thermal | |
Whole window U-value | 1.4 W/m^2 K. |
British Fenestration Rating Council Window Energy Rating | A+. A. B. C. |
Frame | |
Profile | 128 mm PVC-U extrusion rigid multi-chamber profile to BS EN 12608. |
Reinforcement | Galvanized steel. Aluminium. Manufacturer guidanceDefined in the technical manual. |
Colour and texture | Cream RAL 9001. Guidance for specification option: Cream base. Claystone. Guidance for specification option: Cream base. Pebble Grey RAL 7032. Guidance for specification option: Cream base. Windsor. Guidance for specification option: Cream base. Sage Smooth. Guidance for specification option: Cream base. Agate Grey RAL 7038. Guidance for specification option: Cream base. Chartwell Green BS14C35. Guidance for specification option: Cream base. Irish Oak. Guidance for specification option: Tan base. Light Oak RAL 8001. Guidance for specification option: Tan base. Honey Oak Super Matt. Guidance for specification option: Tan base. Pyrite. Guidance for specification option: Tan base. AnTeak. Guidance for specification option: Brown base. Swamp Oak ST-F. Guidance for specification option: Brown base. Rosewood RAL 8017. Guidance for specification option: Brown base. Black Brown RAL 8022. Guidance for specification option: Brown base. Flemish Gold Smooth. Guidance for specification option: Brown base. White RAL 9010. Guidance for specification option: White base. Dark Red RAL 3011. Guidance for specification option: White base. Steel Blue RAL 5011. Guidance for specification option: White base. Dark Green RAL 6009. Guidance for specification option: White base. Black Ulti-Matt. Guidance for specification option: Grey base. Silver D Smooth. Guidance for specification option: Grey base. Hazy Grey Finesse RAL 7001. Guidance for specification option: Grey base. Kensington Grey RAL 7037. Guidance for specification option: Grey base. Buckingham Grey RAL 7005. Guidance for specification option: Grey base. Basalt Grey (Smooth) RAL 7012. Guidance for specification option: Grey base. Slate Grey (Finesse) RAL 7015. Guidance for specification option: Grey base. Slate Grey RAL 7015. Guidance for specification option: Grey base. Anthracite Grey RAL 7016. Guidance for specification option: Grey base. Anthracite Grey (Smooth) RAL 7016. Guidance for specification option: Grey base. Manufacturer guidanceConsult manufacturer for further details and lead times. Note that the RAL colours listed are not exact matches; the manufacturer recommends that the colour match is checked prior to use to ensure suitability. Colour swatch booklets are available upon request. |
Glazing or infill | |
Requirements | 24 mm insulated glazed unit to BS 6262. |
Hardware | Controllable ventilators. |
Fixing features | Bubble and brush seals ensure performance meets the requirements of BS 6375-1. |
Sustainability data
Country of material origin | United Kingdom |
Country of product manufacture | United Kingdom |
Manufacturing plant location | |
Material | PVC-U |
Recyclability | Manufacturer guidanceThe Building Research Establishment (BRE) reports PVC-U offers a service life of 35 years expanding the life span of 350 years which makes PVC-U a sustainable building material. |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 0 % Manufacturer guidanceThe lifecycle is extended with Epwin Recycle offering a true cradle-to-cradle solution. The post-consumer PVC-U is collected, broken into small pieces, processed and reintegrated in the manufacturing process, turning old windows to a new, with minimal harm to the planet. |
Expected Life | 35 year Manufacturer guidanceThe Building Research Establishment (BRE) reports PVC-U offers a service life of 35 years expanding the life span of 350 years which makes PVC-U a sustainable building material. |
BIM objects
| Platform | Compatible | Version |
|---|---|---|
 Revit | - | 1 |
Product certifications
BSI Kitemark
BS EN 12608-1 - PVC-U Profiles for the fabrication of windows and doors Certificate no. KM 12895
PAS 24
BS EN 12608-1 / PAS24 - PVCU Profile Enhanced Secured Window Systems Suppliers Certificate no. KM 33523
Literature
Literature type
Epwin Window Systems Vertical Sliding Sash Brochure
PVC_U window and door Colour guide_Epwin Window Systems
Case studies
Westcliffe Court, Southport vertical sliders apartment building
Westcliffe Court, Southport Vertical Sliders - Private developement
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