This Georgian sash window on hidden springs pairs the traditional multi-pane astragal grid with a modern spiral balance mechanism. Because the springs are concealed within the frame rather than housed in a weight box, the window sits in a slimmer profile — ideal where wall depth is limited or where you want more glass and less timber. Prices start from £699+VAT.

Hidden spiral balances instead of a weight box

Each sash runs on concealed spring balances that take the place of cast weights and cords. The result is the same smooth vertical sliding action, but without the deep box frame a weighted sash needs. That makes spring balance sash windows easier to fit into shallower reveals, newer brickwork and extensions, while servicing is straightforward because the balances are accessible from inside the frame.

A true Georgian look in a slimmer frame

The astragal bars divide both sashes into the small, even panes that define Georgian windows, so from the street the window reads as a genuine period sash. Compare the full range of sash windows on hidden springs, choose engineered pine, meranti or oak, and specify energy-efficient glazing rated at a U-value of 1.4 W/m²K.

• Concealed spiral balances — smooth sliding sash action without a weight box.
• Slimmer frame profile that maximises glass area in shallower reveals.
• Full Georgian astragal bar grid for an authentic multi-pane appearance.
• Energy-saving glass with a U-value of 1.4 W/m²K, certified to Building Regulations.
• Warm Edge Spacer Technology to improve insulation and reduce condensation.
• Choice of engineered pine, meranti or oak timber.
• Finished in any RAL or Farrow & Ball colour with a 7-step painting process.
• Fully draught-sealed with a complete set of standard ironmongery.

Frequently asked questions

What is a sash window on hidden springs?

It is a vertical sliding sash window where concealed spiral balances counterbalance the sashes instead of traditional cast weights. The springs are hidden inside the frame, so the window keeps the classic sliding action while needing far less frame depth than a weighted box sash.

What is the difference between springs and weights?

Weights need a deep box frame and are the historically authentic option; springs need no box, giving a slimmer frame and easier installation. If you prefer the original mechanism, see our Georgian sash window on weights with the same astragal grid.

Do spring balance sash windows last?

Yes. Quality spiral balances are rated for many years of daily use and can be replaced individually without disturbing the frame, which keeps long-term maintenance simple and inexpensive compared with re-cording a weighted sash.

How much does a Georgian sash on springs cost?

This window starts from £699+VAT, with the final price depending on size, timber, glazing and colour. Request a quote and we will price your exact specification.