What affects the cost of sash horn windows?

The main cost drivers are opening size, horn style, bar layout, glass, colour, trickle vents, access, and how many windows are being replaced. We confirm those details during survey before quoting.

Are sash horn windows the same as sliding sash windows?

No. Sash horn windows are usually casement-style windows with period horn detailing. Sliding sash windows move vertically and use a different frame system.

When should I choose sash horn windows instead of flush sash?

Sash horns are useful when you want a more traditional decorative cue. Flush sash is usually chosen when the flatter timber-like frame line is the main priority.

How much do sash horn windows cost in Romford?

Sash horn window cost is quote-led because opening size, horn style, bar layout, glass, colour, trickle vents, access, and the number of windows all affect the final specification. We confirm those details during survey before giving a fixed written quote.

What is a sash horn and why does it matter?

A sash horn is the curved extension at the lower corners of the upper sash. On original timber box sash windows, horns were a structural necessity of the joinery. On a replacement window, retaining this detail makes the new window period-accurate and far more sympathetic to the property's character than a plain sash.

Are sash horn windows suitable for conservation areas?

Yes, sash horn windows are generally considered a sympathetic replacement in conservation areas and for listed buildings where the original windows had this detailing. We recommend confirming with your local planning authority before ordering, as permitted development rights vary.

How do modern sash horn windows compare to original timber box sash windows?

Modern uPVC or timber-effect sash horn windows replicate the external appearance very closely while delivering double glazing, draught-free operation, and significantly lower maintenance. There is no need to repaint, repair sash cords, or deal with draughts from ageing putty.

Windows

Sash Horn Windows

Sash horn windows supplied and fitted in Romford and Essex for period-style fronts, bays, and upper floors.

Romford and Essex supply and fit
70mm multi-chamber frame
Up to A+14 rated
U-value 1.3 W/m²K (double) or 0.9 W/m²K (triple)
Run-through integrated sash horns

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020 8500 9100

Overview

What is a sash horn window?

Sash horn windows are a useful route when a Romford or Essex home needs period detail on the front elevation but does not necessarily need a true vertical sliding sash. The horn detail, bar layout, frame colour, handle style, trickle vents, and reveal position all affect whether the finished window looks deliberate from the road. We compare sash horn casements against sliding sash, flush sash, and standard casement options during survey so Victorian, Edwardian, bay-fronted, and older-looking homes get the right level of traditional detail before manufacture.

10-year profile guarantee. No warping, splitting, or discolouration

10-year mechanical guarantee on Shootbolt locking

Fully integrated run-through sash horns

Continuous rebate gasket seal for weather-tightness

Double rebated, welded joints, hand-finished

100% lead-free, recyclable uPVC. BSI Kitemark certified

Personalise Your Window

Colours & Finishes

Frame colour: Smooth White

Standard colours

Extended lead time colours

Dual colour may be available, with different interior and exterior frame finishes depending on the range.

Period hardware finish

A sash horn window opens on a casement handle rather than a sliding-sash catch. Shown here in five finishes, matched to the frame colour and the period look so the hardware suits the run-through horns and any bar layout.

Made to measure. We confirm the colour, glazing, handle finish, and opening layout during your survey.

Period hardware finish

Made to measure. We confirm the colour, glazing, handle finish, and opening layout during your survey.

Configure Your Sash Horn Window

Plan a sash horn window that reads as a true period sash

These are the decisions that shape a sash horn window: how faithfully it replicates an original box sash from the street, and how each opening is used, worked through before a survey.

Made to measure

How a sash horn window reads from the street

The horns and the box-sash proportions are the whole point. Get them right and a uPVC window passes for an original timber sash; get them wrong and it reads as a plain casement with bars.

Run-through sash horns

The horn is the curved extension at the lower corners of the upper sash. On an original timber box sash it was a structural part of the joinery; here it is run through as a continuous part of the frame, not a stuck-on cosmetic piece. It is the single detail that makes a replacement read as a genuine period sash.

Continuous run-through horns, not a bolt-on
The detail that reads as a real period sash
Horn profiles matched to the windows either side

Box-sash proportions

A horizontal meeting rail and balanced two-over-two sashes recreate the proportions of a Victorian or Edwardian box sash. From the pavement the window reads as a traditional sliding sash, while behind the look it opens as a practical casement, easier to clean and with no cords or weights to fail.

Meeting rail and balanced two-over-two sashes
Reads as a traditional box sash from the street
Opens as a practical casement, not a slider

Astragal and Georgian bars

Slim astragal bars, or internal Georgian bars within the sealed unit, recreate the individual-pane detailing of an original sash where the elevation or a conservation street calls for it. A six-over-six or two-over-two layout is matched to the age of the house, or each sash is left as a clean single pane.

Astragal or internal Georgian bar layouts
Six-over-six or two-over-two, matched to the period
Or left clean for a simpler frontage

70mm multi-chamber construction

Behind the period look, a sash horn window is built on the same 70mm multi-chamber profile as our casements, with welded corners, a continuous gasket seal, and A+ rated glazing. That gives the box-sash appearance the warmth, security, and draught-free operation an original timber sash cannot, with no cords, weights, or repainting.

70mm multi-chamber profile with welded corners
Continuous gasket seal, no draughts or rattles
No sash cords, weights, or repainting

How each window opens and glazes, room by room

Behind the traditional sash face, the window works like a quality casement. Opener layout, glass, and ventilation are planned around how each room is used.

Side-hung and top-hung openers on friction stays that hold at any angle

Fixed sashes where you want maximum glass and a settled period look

Egress and easy-clean hinges for bedrooms and habitable rooms that need a safe means of escape

A+ rated double glazing as standard, with triple glazing down to 0.9 W/m2K for exposed or north-facing rooms

Obscure and toughened safety glass for bathrooms and overlooked ground-floor rooms

Trickle vents set discreetly into the frame for background ventilation where they are required

Opener direction, fire-escape sashes, and trickle vents for background ventilation (Building Regulations Part F) are confirmed room by room at survey.

Period detailing that finishes the sash look

Colour, hardware, and bead detailing separate a convincing sash horn from a plain white window. These are chosen to match the age and character of the house and are previewed in the personalise section above.

The full 18-colour palette, including Chartwell Green, cream, Golden Oak, and Anthracite

Dual colour, with a heritage finish outside and white inside

Handle finishes in white, black, chrome, gold, and satin silver, previewed above

Run-through horn profiles matched to the windows either side on a terrace or conservation street

Staff-bead and putty-line bead profiles instead of bulky modern beading

SAC multipoint locking concealed behind the period look, backed by the £7,500 break-in guarantee

Colour and hardware are previewed in the personalise section above. Final finishes are confirmed against the elevation at survey.

Guide pricing

What affects the price of a sash horn window

Sash horn windows are quoted from a survey rather than one fixed price, because the cost follows the openings and the period detail. As a guide, a sash horn window starts from £899 per window, with the rate improving across a larger order. These are the main things we price around.

From £899 per window

Number of windows

The guide figure is per window. A single sash, a full elevation, or a whole-house upgrade all change the total, and a larger order usually improves the per-window rate.

Window size and bays

Larger openings, bay frames, and combination layouts use more material and labour than a standard single opening.

Horn profile and bar layout

Run-through horns, and astragal or Georgian bars matched to a period elevation, are priced on top of a plain glazed sash. A clean two-over-two costs less than a six-over-six.

Glass and ventilation

Double glazing is standard. Triple, acoustic, obscure, or solar-control glass, and any trickle vents for Part F, change the sealed-unit price.

Colour and finish

Smooth white is standard. Woodgrain foils, dual colour inside and out, and extended-lead colours add cost.

Hardware upgrades

Handle finish, restrictors, and any egress or security hardware beyond the standard multi-point locking.

Removal and making good

Taking out the old timber or uPVC frames and tidying the brick or plaster reveal where the opening needs it.

Because size, glass, colour, horn profile, and the number of windows vary house to house, the final price is confirmed at a free survey with a fixed written quote. The guide figure is per window and is subject to survey and specification.

Product fit

Period detail without always choosing a vertical slider

Sash horn windows suit Romford and Essex homes that need traditional detailing but do not always need a true sliding sash mechanism. The horn detail, glazing bars, handle choice, trickle vents, reveal position, and frame colour all affect whether the finished elevation looks considered or simply decorative.

Best fit for

Victorian and Edwardian-style front elevations
Homes where standard casements look too plain from the road
Projects that need period cues with simpler casement operation

Consider another option when

The house really needs true vertical sliding sash proportions
The elevation is modern and would look cleaner with simpler casements
The horn detail would only be decorative on a hidden or low-priority opening

What we check on survey

We check whether the house needs sash horn casements, true sliding sash, flush sash, or simpler casements.
We review glazing bar layout, horn detail, and trickle vents against the rest of the front elevation.
We confirm colour, hardware, reveal position, and access together so the window does not look mismatched.

Compare window styles

Which window style is right for the opening?

Sash horn earns its place where a period frontage wants traditional box-sash character, the horns and bar detailing, without the cost of a full sliding sash. Here is how it compares with the other styles we supply, so you can see where each one fits.

Casement: Most replacements and full-house upgrades. The practical default: secure, cost-effective, and available in every colour, glazing, and bar option.
French casement: Wide clear openings and uninterrupted views. Two sashes open from the centre with no central bar, for the widest clear opening and the most light.
Flush sash: Period homes and visible elevations. The sash sits flush with the frame for a flatter, timber-look finish that suits conservation areas.
Sliding sash: Victorian, Edwardian, and bay-fronted homes. Vertical sliding sashes that keep the authentic look of an original period frontage.
Sash hornYou are here: Period character without a full sliding sash. Casement convenience with traditional run-through horn detailing for character streets.
Tilt and turn: Cleaning access and secure ventilation. Tilts inward for airflow and turns fully inward for easy cleaning, ideal for upper floors and flats.
Aluminium casement: Slim sightlines and modern elevations. Slimmer powder-coated frames for larger openings and contemporary or dark-framed looks.

Optional Upgrade

Selective privacy for sash horn window rooms

Sash horn windows are usually chosen for traditional detailing, so integral blinds should be used with care. They can still be useful on overlooked bedrooms, upper floors, and less formal rear elevations where privacy matters more than a classic curtain or shutter look.

Window with integral blinds inside the glazed units for privacy control

Traditional detail, modern control

Best used selectively where the room needs privacy without losing the sash-style frame detail.

Useful on sash horn windows when

The room is overlooked but the sash horn detail should stay visible
The opening is on a rear or side elevation with a more modern interior
Surface-mounted blinds would make the frame look busier than intended

Blind types we can discuss

Magnetic integral blinds

A slim magnetic slider raises, lowers, and tilts the blind inside the sealed glass unit.

Electric integral blinds

Remote operation suits larger panes, harder-to-reach glass, and cleaner contemporary rooms.

What we check

Glass unit size and cavity depth
Handle position, reveal depth, and room layout
Whether magnetic or electric operation is worth pricing

We compare integral blinds with curtains, shutters, obscure glass, and standard clear glass so the period-style look stays balanced.

Ask about sash horn blind upgrades

How It Works

From Survey to Sign-off

Step 1

Survey & streetscape match

We measure every opening and, because a sash horn window has to sit convincingly among period frontages, we read the elevation and the windows either side: the horn profile and proportions, the meeting-rail height, the bar layout, and the colour, so the new windows match the character of the terrace or conservation street. We confirm opener direction, any fire-escape egress sashes, and any planning points before quoting.

Step 2

Made to measure

Each sash horn window is built to the measured size on the 70mm multi-chamber profile, with the run-through horns, the astragal or Georgian bar layout, A+ double or triple glazing, the colour foil inside and out, and the casement gearing and shootbolt locking all locked together before manufacture.

Step 3

Install & sign-off

Our Cii team fits and seals each frame so the horns and meeting rail line up cleanly across the elevation, adjusts every opener and the locking so each sash closes and locks cleanly, fits trickle vents where Building Regulations require them, and hands over with the Cii 10-year guarantee and Assure certification.

After installation

Looking after your sash horn windows

A sash horn window gives the look of a painted timber sash with none of the upkeep: no cords to replace, no repainting, no draughts. A little routine care keeps the finish and the action like new.

Every opener and the locking is adjusted at handover so each sash closes and locks cleanly
Frames never need painting or sealing, just a wipe down with warm soapy water
An occasional wipe of the seals and a drop of oil on the hinges keeps the action smooth
Drainage slots along the bottom of the frame stay clear with the same routine clean
Backed by the Cii 10-year guarantee with Assure certification where applicable

White uPVC sash horn windows on a Victorian red-brick terrace, by Cii Double Glazing

Free Survey

Ready to price up your sash horn windows?

Once you have settled on the horn profile, bar layout, colour, and glazing, we survey each opening, match the proportions to the windows either side, check any conservation points, and give you a fixed written quote with no obligation.

Free surveyFixed quoteDirect Cii installation team

Get a free quote 020 8500 9100

Checkatrade

“Had sliding sash windows fitted throughout. The quality is brilliant, they look period-authentic, and the tilt-clean feature is a godsend. Thoroughly recommend Cii.”

Google

“Outstanding from start to finish. The casement windows are a perfect fit and the energy difference is already noticeable. The lads were tidy, efficient, and clearly knew their trade.”

Google

“Replaced all 12 windows across our Victorian terrace. Every window fits perfectly, the sightlines are great, and the house is noticeably warmer. Superb job.”

Google Reviews