Trade uPVC sliding sash windows in Hertfordshire

Ordering uPVC sliding sash windows for jobs in Hertfordshire

Sliding sash windows are made around the balances, so we size each window individually and choose the balance to suit the sash weight, including any acoustic or toughened glass you specify.

Sashes tilt in for cleaning, which matters on upper floors of flats and terraces where the outside of the glass cannot be reached from a ladder.

Specification at a glance

• Run-through horns or plain sashes
• Georgian and astragal bar patterns
• Tilt-in sashes for cleaning from inside
• Spiral or constant-force balances sized to sash weight
• Double glazed sealed units, with heritage spacer colours

Delivery across Hertfordshire

We deliver to sites and yards in Hertfordshire as part of our mainland delivery service. Delivery is priced on the quote, so you know the full cost before you place the order.

Building regulations in England

Replacement windows in England should meet Approved Document L: a U-value of 1.4 W/m²K or a Window Energy Rating of band B. Approved Document F expects background ventilation to be no worse than before, which usually means trickle vents. Glazing in critical locations must break safely, be robust or in small panes, or be permanently protected under Approved Document K, which in practice usually means toughened or laminated safety glass. Rooms that need an escape route may need an escape window under Approved Document B. Replacing windows is notifiable building work: the installer self-certifies through a competent person scheme such as FENSA or Certass, or the work goes through building control.

Before anything goes into production you get a written order acknowledgement with sizes, finishes and handing for every item. Check it carefully, because made-to-measure items cannot be returned if the sizes were wrong.