Sliding Sash Windows
Sliding Sash
Windows
Period-correct sash windows for Victorian and Edwardian properties. Authentic proportions, run-through horns, modern performance. Fitted across Surrey and London.
The Sash Window
Done Properly
A poorly specified sash window sticks out. Profiles that are too chunky, proportions that do not match the opening, or a white that is too bright against the brickwork — these mistakes undermine the appearance of the whole property.
We know what a Victorian or Edwardian sash should look like. We know which profiles carry the correct run-through horn, which meeting rail depths match the originals, and how to set the balance so both sashes move cleanly and hold their position. The result is a window that belongs on the property — not one that looks like a replacement.
Survey of existing windows for proportions and period details
Correct profile specified for the property — no generic substitution
Both sashes fitted, balanced and tested before sign-off
All draught seals correctly compressed on all four sides
Full building regulations compliance — certificate provided
What We Get Right
The Details That
Make the Difference
Authentic Proportions — the Details That Matter
A sash window that looks right on a Victorian terrace requires more than just the right frame colour. The proportions — sash height, rail depth, glazing bar width — must match the original architectural style. We specify sash windows with the correct details for the property period: run-through horns, authentic meeting rail profiles, and period-appropriate glazing bar options.
- Run-through horns for Victorian authenticity
- Correct sash height and meeting rail proportions
- Optional Georgian bar or astragal bar configurations
- Available in White and Woodgrain foils
- Matching external sub-sill and staff bead finish
Spiral Balance — Smooth Operation for Life
Modern sash windows use a spiral balance mechanism concealed within the frame — replacing the traditional sash cords and lead weights. When correctly specified for the weight of the glass unit, spiral balances give smooth, effortless sliding in both directions. When incorrectly specified, they are heavy to operate or fail to hold position. We get this right.
- Spiral balance specified to the actual glazing unit weight
- Both sashes slide and hold in any position
- No sash cords to fray or break
- Maintenance-free mechanism for the lifetime of the window
- Tilt-in function on both sashes for safe outside-face cleaning
Modern Performance in a Period Frame
The look is traditional; the performance is modern. All our sash windows are double glazed with A-rated sealed units, draught-sealed at the meeting rail and sill, and fitted with multi-point shoot-bolt locking. The result is a window that keeps the period character of the property while meeting current energy and security standards.
- A-rated double glazed sealed units as standard
- Draught sealing on all four sides of each sash
- Shoot-bolt locking at top and bottom of each sash
- Full building regulations compliance on every installation
- 10-year manufacturer guarantee on frames and glazing
FAQs
Sash Window Questions
What properties are sash windows suitable for?
Sash windows are designed for Victorian (1837–1901) and Edwardian (1901–1910) properties where the original windows were traditional sash style. They can also be specified for later 1920s–1930s properties that had sash-style openings, or as a period-appropriate upgrade to any older property. They are not typically appropriate for modern homes built after 1950.
Do UPVC sash windows look like the originals?
A well-specified UPVC sash window, installed correctly, is very convincing. The key details that matter are the run-through horns, the proportions of the sash, the meeting rail profile, and the colour. A sash window that is too white and too chunky will not look right. We specify and fit sash windows to match the character of the property.
Do I need planning permission to replace sash windows?
For most properties, replacing like-for-like with UPVC or aluminium sash windows is permitted development. Listed buildings and properties in conservation areas may have restrictions requiring conservation-grade timber or aluminium sash windows instead of UPVC — we advise on this during the survey.
What is the tilt-in function?
Both the top and bottom sashes can be tilted inward by releasing a latch at the top of the inner sash. This allows you to clean the outside face of the glass from inside the room — important for upper floors where external access would otherwise require ladders.
Can I have Georgian bars or decorative glazing?
Yes. Traditional Georgian bar configurations (dividing the glass into smaller panes) can be specified, either as true glazing bars between separate panes or as decorative astragal bars applied to the glass surface. We advise on which approach suits your property and planning requirements.
Free Quote
Sash Windows That
Belong on Your Home
Will or Sam will assess your existing windows and advise on the correct specification for your property. Free, written, no-obligation quote. Surrey and London covered.