Ashgate · S40
Sash window glazing in Ashgate, Chesterfield
If your Ashgate property has two vertically sliding sashes running in a boxed frame, usually with a horn detail on the upper sash, this page is the specification we would quote. The local brief in S40 is usually cold bays and rattling metal casements, and the draught through the weight pockets is sealed and the original sash keeps operating normally. Ashgate is not a conservation area, so the decision is purely technical rather than a consent question. Many of these calls come shortly after purchase, when the first winter has made the window problem obvious. Coverage runs across Chesterfield and the surrounding S40, S41, S42 districts, with Ashgate (S40) among the areas we survey most often.
Aluminium systems are powder-coated to any RAL colour at no extra lead time.
Listed-building drawings and specifications are prepared free with the quote where consent is needed.
Thermal figures quoted are whole-window, not centre-pane, which is the honest way to state them.
Cavity depth does more for acoustic performance than glass thickness, and we design for it first.
The specification we recommend
| Window type | two vertically sliding sashes running in a boxed frame, usually with a horn detail on the upper sash (Georgian, Victorian and Edwardian, roughly 1750–1910) |
|---|---|
| Underlying problem | the sash box is hollow and the counterweight pockets leak air, so the loss is around the window as much as through it |
| System we fit | vertical sliding secondary units that mirror the original movement |
| Glass specification | 4 mm Low-E for thermal-led jobs, 6.4 mm laminated where noise is the driver |
| Measurement | we measure the reveal at three heights because sash openings are rarely square after a century of settlement |
| Heritage position | nothing is fixed into the sash box itself — the frame is fixed to the reveal lining, so historic joinery is untouched and the work is reversible |
Local detail that changes the job
We avoid any fixing into the pulley stile or staff bead, so the install is fully reversible for a future owner or a conservation officer.
A sash box is a ventilated void by design; most of the perceived draught comes through the pulley stiles rather than through the glass.
Ashgate stock is 1930s semis and modern detached and the prevailing glazing is casement bays, which is why sash window glazing comes up here so often.
We measure the reveal at three heights because sash openings are rarely square after a century of settlement.
Ashgate carries no conservation designation, so the specification is decided on performance alone.
Recent installs nearby
A61 corridor 1930s semi
Front-facing Crittall casements enclosed with hinged secondary units. Traffic noise reduced from disruptive to background.
Nether Edge Grade II sash retrofit
Six original box sashes fitted with balanced vertical secondary sliders — full listed-building consent secured in six weeks.
Ecclesall Road bay-window sound retrofit
Three-panel horizontal sliders across a 3.2 m Edwardian bay — Rw measured at 47 dB post-install.
Local reference points
- Area
- Ashgate (S40)
- Town
- Chesterfield, Derbyshire
- Housing era
- 1930s semis and modern detached
- Typical windows
- casement bays
- Landmark
- Ashgate Hospicecare
- Conservation area
- No
- Window style
- Sash Windows
- Period
- Georgian, Victorian and Edwardian, roughly 1750–1910
Common questions
Will secondary glazing stop my sash windows rattling?
Yes, and it does it without touching the sash. The rattle is wind pressure moving a loose sash in its box, and a sealed room-side pane removes the pressure differential driving it.
Can I still open the sash behind it?
Yes. Vertical sliding secondary units move on the same axis, so both sashes stay operable.
Does it damage original joinery?
No. The fixing is into the reveal lining, not the sash box, and the whole system can be removed later without trace.
Which windows should we do first?
Whichever room you sleep or work in that faces the noise or the prevailing weather. We will say so honestly at survey rather than quoting the whole house by default.
Is it worth it if we might replace the windows later?
If replacement is likely within two years, usually not — we will tell you. If the frames are staying, secondary glazing is the cheaper route to the same comfort.
From enquiry to install
- Step 1
Send a photo of the window — with two vertically sliding sashes running in a boxed frame we can usually tell you the likely system before we visit.
- Step 2
Survey in Ashgate: we measure the reveal at three heights because sash openings are rarely square after a century of settlement.
- Step 3
Manufacture to the templated sizes with your chosen finish.
- Step 4
Room-side install with no external access and no alteration to the original frame.
Sash window glazing in nearby areas
Sash window glazing in Ashgate — the short version
The sash box is hollow and the counterweight pockets leak air, so the loss is around the window as much as through it. We fit vertical sliding secondary units that mirror the original movement with 4 mm Low-E for thermal-led jobs, 6.4 mm laminated where noise is the driver, templated to your opening. The draught through the weight pockets is sealed and the original sash keeps operating normally.
Just moved in?
We will tell you which windows are worth treating first and which can wait — no pressure to do the lot. Send a photo of the sash window glazing — with two vertically sliding sashes running in a boxed frame in a 1930s semis and modern detached Ashgate property we can usually spec it before we visit.