Sliding sash windows,
the period look, without the upkeep.
ECOSlide uPVC vertical sliders styled on Georgian and Victorian timber box sashes, from arched heads to bays, with horns, deep bottom rails and timber-look joints if you want them, but sealed, warm and never needing a coat of paint. Made to measure and fitted across Suffolk and Essex by Admiral’s own team. Take a written price away, and decide in your own time.
- The look of timber sashes
- Often approved in conservation areas
- Showroom in Ipswich
Our windows brochure, free and ready straight away.
“They couldn’t get closer to an original sash window if they tried. (We have PVC sash.)”
The sash windows we fit
- ECOSlide, by Victorian Sliders
Sliding sashes, in ECOSlide’s own photos.
Our sliding sashes are ECOSlide, made by Victorian Sliders, and ECOSlide lists Admiral on its installer finder.
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A Georgian townhouse
- Shown
- White sashes with glazing bars on a stone house
- Photo
- ECOSlide
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A Victorian terrace
- Shown
- White sashes in a bay and upstairs
- Photo
- ECOSlide
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Easy to clean
- Shown
- The lower sash tilted in for cleaning
- Photo
- ECOSlide
Product photos from the makers’ own brochures and websites: ECOSlide. Our own recent jobs are under Recently fitted.
What is a sliding sash? Two sashes, up and down.
A vertical sliding sash has two glazed sashes that slide past each other in the frame: the top one down, the bottom one up. Open both a little and warm air leaves at the top while fresh air comes in at the bottom, the way Georgian and Victorian windows were meant to work.
- Optional deep bottom rails, run-through horns and timber-look joints, as on a timber box sash
- Astragal or Georgian bars for the look of separate panes
- Balanced to slide smoothly and stay where you leave them, and both sashes tilt in so you can clean the outside from indoors
- Sealed against draughts and rattles, and A+ rated as standard, says ECOSlide
The full ECOSlide range, made to measure.
We fit every style, feature and option ECOSlide makes, so your windows can match the house. Every standard ECOSlide sash is A+ rated, with a U-value of 1.3 W/m²K and toughened glass in both sashes, and tilts in so you can clean the outside from indoors.
- Shapes
- Straight-topped sashes, or arched heads: swept, true arch and Gothic. On an arched window the top sash is usually fixed and the bottom one slides.
- Bays
- Splayed (canted) bays and square box bays, with sashes that slide or stay fixed.
- Panes
- Plain glass, or the look of separate panes: astragal bars on the glass, or Georgian bars inside the double glazing.
- Details
- Run-through horns or none, a deep bottom rail, timber-look joints, and a seamless midrail as standard.
- Air
- Trickle vents hidden in the head of the frame, to meet Part F without spoiling the look.
- Colours
- White as standard. Foils in crystal white, cream, golden oak, Irish oak, rosewood, agate grey, anthracite grey, black brown, Chartwell green, and matt grey, white or black. A colour outside with white inside. Or sprayed to almost any RAL colour, or matched to Farrow & Ball.
- Hardware
- Key-locking camlocks, sash lifts, pole eyes, tilt knobs and travel restrictors, with D handles or inset finger pulls if you prefer, in eight finishes, from white and chrome to black nickel, rose gold and antique gold.
- Glass
- Toughened, A+ rated double glazing as standard, down to 1.2 W/m²K. Acoustic, laminated or solar glass if you need it, and obscure patterns for privacy.
- Security
- An anti-jemmy bar in the cill and key-operated locks as standard, tested to PAS 24. Secured by Design and Document Q versions, and a fire escape design, on request.
From ECOSlide’s website and consumer brochure, October 2026.
Recently fitted by our own crews.
Two recent window jobs from our Facebook page, one of them with ECOSlide vertical sliders, and what went in. ECOSlide lists Admiral on its installer finder.
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Flush casements and vertical sliders
- Fitted
- Halo System 10 mitre-jointed flush casements and ECOSlide vertical sliders
- Finish
- Smooth white, with 18 mm internal Georgian bars
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Bay and casement windows
- Fitted
- White uPVC windows, in bay and casement styles
- Glass
- Energy-efficient double glazing
Photos and product lists from Admiral’s Facebook posts, 2025 and 2026.
Period homes and conservation areas.
Sash windows are the window of Georgian and Victorian houses, and the details are what make a replacement look right. We match them to the house, then leave the decision with you, and your council if it has a say.
The details we match
- The pattern of panes: two-over-two, six-over-six or plain glass, with astragal or Georgian bars
- The shape: straight-topped, arched or in a bay, as the house has them
- Horns or none, a deep bottom rail and timber-look joints
- A colour to suit, from white, cream and woodgrains to a sprayed RAL or Farrow & Ball colour
- Sash locks and lifts in a finish that suits the house
Planning and listed buildings
- In a conservation area, your council decides what’s allowed. uPVC sashes with the right details are often approved, and we can help with what the council asks for
- In a listed building the original windows usually have to stay. Secondary glazing adds warmth and quiet from the inside
- Outside both, replacing like for like is usually permitted development
Is a sash right for you? Our honest advice.
Sashes look best where they belong. On a modern house, another style is often simpler and costs less.
A sliding sash suits
- Georgian, Regency, Victorian and Edwardian houses
- Openings onto a path, as nothing swings out
- Bays on period houses, as part of a canted bay
- Replacing worn timber sashes that rattle and let in draughts
Look at another style if
- You want the timber look on a cottage or a newer house: flush casement windows
- You want the whole window to open wide: tilt and turn windows
- Your house had steel windows: Crittall-style windows
225 reviews. Not one below four stars.
Three window reviews, as they were written. Admiral invites every customer to review on Trustpilot, good or bad.
4.9/5
Also rated 4.9 from 35 reviews on Google. Figures checked 24 October 2026.
- uPVC sash
“…Jordan and the team were great, no hard selling, just clear communication with no pressure. When it came to fitting Ash & Jake were wonderful, their work was to a high standard…”
Lara Rodwell - Conservation area
“As we are in a conservation area they helped us with window selection and were very knowledgeable about what windows were required. The fitters were excellent and we were surprised how little disruption there was to each room.”
Mrs Hall - Victorian cottage
“…they really do look like wood when viewed from the outside - but without all the hassle of having to paint them.”
Lesley Hickman
From first call to final clean-up.
Clear advice, a price in writing and our own team for the fitting. Four steps, at your pace.
Tell us what you need
Send the quote form, call us, or come and see every window style on display in our Ipswich showroom.
Free survey
One of our own surveyors measures every opening and talks you through frames, glass and styles. It costs nothing.
Your written quote
Take it away and decide in your own time. No pressure, and finance if you’d like to spread the cost.
Fitted by our crew
Made to measure and fitted by Admiral’s long-serving fitters, who clear up and take the old windows away.
Spread the cost. Over 1 to 10 years.
Finance through Novuna at 12.9% APR representative, on amounts from £500 to £25,000, with a 10% to 50% deposit.
There’s also a buy now, pay later plan at 14.9% APR, with your first payment put back 6 or 12 months. Finance is subject to status.
Your figure, not our price.
£100.54a month for 5 years
After a £500 deposit. Total payable £6,532.40, including £1,532.40 interest. An illustration only, not an offer of credit.
Representative example: cash price £8,000, deposit £3,000, amount of credit £5,000, 12 monthly payments of £444.70, total charge for credit £336.40, total amount payable £8,336.40. 12.9% APR representative.
Finance is subject to status. Admiral Home Improvements Ltd (FRN 1053043) is an Appointed Representative of Ipswich Trade Frames Ltd (FRN 794166), a credit broker, not a lender, which is authorised and regulated by the Financial Conduct Authority. Finance is provided by Novuna.
See every style before you choose.
Full-size, working displays of windows and doors in uPVC, aluminium and composite, with parking at the door. Book ahead and we’ll make sure an adviser is free.
Visit our Ipswich showroom
Monday to Friday, 7.30am to 4.30pm
- Monday to Friday
- 7.30am to 4.30pm
- Saturday and Sunday
- Closed
Hampstead House, Felixstowe Road, Nacton, Ipswich IP10 0DE. Parking right outside the door.
Questions about sash windows.
Anything else? Request a quick callback or call 01473 659062 and ask us straight.
How much do sash windows cost?
Every sash is made to measure, so the price depends on the size, the pattern of panes, the colour and the glass. One of our own surveyors measures every opening for free, and you get a written quote to take away. Finance is available at 12.9% APR representative.
Do uPVC sash windows look like timber?
Close enough that customers say so: astragal bars, run-through horns, a deep bottom rail and timber-look joints give the proportions of a timber box sash, in white, cream, greys, woodgrains or a sprayed colour. Talk them through in our Ipswich showroom before you choose.
Will the council allow uPVC sashes in a conservation area?
Your council decides, and rules differ from area to area. uPVC sashes with the right details are often approved. Ask your council first if your house is covered by an Article 4 direction, and in a listed building expect the original windows to stay, with secondary glazing inside for warmth.
Are sash windows draughty?
Old timber ones often are. Ours are sealed all round, and ECOSlide rates them A+ as standard, with a U-value of 1.3 W/m²K, and acoustic, laminated or solar glass if you want them. In England, replacement windows must reach a U-value of 1.4 W/m²K or better, or energy rating Band B, and we confirm the rating of your windows, with the glass you choose, in your written quote.
Are sash windows secure?
Yes. Key-locking camlocks hold the two sashes together where they meet, an anti-jemmy bar runs along the cill, both sashes have toughened glass, and restrictors let you leave a window open a little for air without it opening further. ECOSlide’s sashes are tested to PAS 24, and Secured by Design versions are available.
Can sash windows go in a bay?
Yes. ECOSlide makes splayed (canted) bays and square box bays, as on many Victorian and Edwardian houses, with sashes that slide or stay fixed. More about bay windows.
Can you make arched sash windows?
Yes. ECOSlide makes three arched heads: a gentle swept head, a true arch (a full half circle) and a pointed Gothic arch, each made to measure. On an arched window the top sash is usually fixed and the bottom one slides; ask us if you’d like both to open.
uPVC or timber sashes?
Our sliding sashes are uPVC, made to look like timber without the upkeep: nothing to rot, and no repainting. For a slim, metal look on a 1930s or Art Deco house, Crittall-style aluminium windows are the usual choice.
Which areas do you cover?
We fit sash windows across Suffolk and Essex from our showroom in Ipswich, including Felixstowe, Woodbridge, Kesgrave, Stowmarket, Hadleigh, Manningtree and Colchester. Put your postcode in the quote form and we’ll confirm.