Timber Box Sash Windows

Traditional craftsmanship, modern performance

Timber box sash windows offer the perfect blend of classic period styling and advanced engineering. Designed to replicate the elegance of traditional sash windows, they deliver smooth operation, excellent thermal performance, and long‑lasting durability — ideal for heritage homes, cottages, conservation areas, and anyone who wants a timeless look with modern comfort.

Key Features

Authentic Box Sash Design

• True heritage appearance with traditional cords & weights

• Smooth, balanced sliding action

• Ideal for period properties and listed‑style aesthetics

• Available in three sash box thicknesses:

  • 165/56

  • 150/50

  • 145/44 (as listed in the brochure)

Premium Timber Construction

• High‑quality timber for strength, stability, and longevity

• Excellent insulation and natural warmth

• Can be factory‑finished in a wide range of colours and stains

Modern Performance

• Improved thermal efficiency

• Smooth, reliable operation

• Optional spiral balance system for slimmer frames or heavier sashes

Hardware Options 

Sash Lifts & Handles

• Ring sash eye

• D‑handle

• Hook lifts All available in: Polished Chrome, Satin Chrome, Polished Brass, Antique Brass, White

Sash Locks

Choose from classic or contemporary styles:

• Mini Brighton fastener (locking or non‑locking)

• Fitch / Heritage fastener

• Modern fastener

• Hook fasteners (narrow keep, reeded knob, ceramic knob) All available in the same premium finishes.

Restrictors & Ventlocks

• Angel Ventlock

• Migstop

• Vent lock locking

• Push ventlock

• Mini locks All with matching finishes.

Sash Pulleys & Springs

• Traditional pulleys

• Spiral balance systems (Ultralift, Torso II, Spirex, Spiralift)

• Available in white, brown, grey, cream depending on model (From the Caldwell hardware section)

Why Choose Timber Box Sash Windows?

• Perfect for heritage and conservation‑style homes

• Beautiful, authentic appearance

• Smooth, reliable operation

• Excellent insulation and acoustic performance

• Wide choice of hardware, horns, and finishes

• Traditional cords & weights or modern spiral balance options