uPVC Sash Windows Installation

Homeowners in Hampstead wanted to retain the period character of their Victorian terraced house while improving energy efficiency. The original timber sash windows were draughty, single-glazed, and required constant maintenance. The goal was to install uPVC sash windows that replicated the traditional look but offered modern thermal performance, security, and noise reduction.

Our Solution

We supplied and installed heritage-style white uPVC sash windows throughout the front and rear elevations. The solution included:

• Traditional sliding sash design with mechanical joints for authentic appearance

• A-rated double glazing with acoustic performance for Hampstead’s busy streets

• Tilt-in functionality for easy cleaning of upper sashes

• Spiral balances for smooth, weight-free sliding operation

• Multi-point locking system and security restrictors

• Timber-effect foil finish on internal faces to match original period detailing

• Trickle vents concealed within the head rail for compliant ventilation

Installation Process

• Conducted detailed pre-installation survey and measured each window opening

• Removed original timber sash windows carefully to preserve surrounding brickwork and internal architraves

• Disposed of old frames and glass responsibly

• Inspected and repaired box frames where necessary

• Installed new uPVC sash window frames using galvanised fixings and expanding foam

• Fitted double-glazed sealed units into both upper and lower sashes

• Attached spiral balances and tested smooth sliding operation

• Applied internal and external silicone seals for weatherproofing

• Adjusted all locking mechanisms, restrictors, and tilt-in functions

• Completed thorough clean of glass, frames, and surrounding areas