From £1,650 per window*
Based on a 1200 x 1200mm window, fitted, inc VAT, based on 4 windows fitted
Aluminium Flush Casement Windows
Clean, chamfered lines that go the distance. A flat, flush sash in a slim, low-maintenance aluminium frame, built to cope with whatever the Surrey weather throws at it.
Designed, supplied and fitted by our own team across Surrey, Berkshire, North Hampshire, Middlesex and West Sussex. Showroom in Guildford.
Flush casement windows sit flush within the frame rather than protruding from it, giving a smart, contemporary look that suits a period home just as well as a modern one. Aluminium is our most popular choice for anyone after a slim, low-maintenance frame that’s built to last.
From £1,650 per window, supplied and fitted, including VAT.*
Won't warp, rot or corrode
Aluminium doesn’t absorb moisture
Low maintenance
A quick wipe down is usually all it takes
Chamfered outside, sculpted inside
The flush casement’s signature finish
8 to 10 weeks
Order to installation, then 1 to 2 days on site
10 year guarantee
Insurance backed as standard, plus your FENSA certificate
What aluminium flush casement windows cost
From £1,650 per window, supplied and fitted, including VAT.*
Most window companies will not put a number on a page. We will, because you need one before you invite anyone into your house.
Prices are indicative. Access, the condition of the existing frames and the fitting itself all move the final figure. Your quotation is the accurate number, and it is free.
Spread the cost
Your payment can be spread monthly over a term of up to 10 years.** Finance is provided by Dopple and you apply through our finance portal. A small deposit is due on order, the balance on completion.
How long it takes
| Stage | How long |
|---|---|
| Enquiry to home visit | As little as 2 working days |
| Home visit to quotation | 2 working days, up to 5 for specialist items |
| Order to technical survey | Up to 10 working days |
| Order to installation | Generally 8 to 10 weeks |
| Time on site | Typically 1 to 2 days for a full house |
| Do you need to move out? | No. You stay in the house throughout |
Why quotes are valid for 14 days
Glass manufacturing is heavily energy dependent, so our costs move with energy prices. Rather than pad every quotation against a rise that may not happen, we quote the real number on the day. If it lapses, come back whenever you are ready and we will requote free of charge.
Why homeowners choose aluminium flush casement
You want a slim, contemporary look that still suits a period home. Clean, chamfered lines and a flat surface that sits neatly within the frame.
You want a frame that looks after itself. No repainting or resealing, a quick wipe down keeps it looking as good as day one.
You want it to cope with anything the weather throws at it. Aluminium doesn’t absorb moisture, so it won’t warp, rot or corrode.
You want a colour to match your house exactly. White Gloss, Anthracite Grey Matt, Black Matt, or any RAL colour.
Slimline window security
Every aluminium flush casement window can be specified to PAS 24, the enhanced security standard that Building Regulations require on new homes.
- Can be specified to PAS 24, the enhanced security standard used by Building Regulations
- Multipoint locking system
- Hinge protectors available
Tell your surveyor if security is a priority and we will specify accordingly.
Expertise You Can Trust
Proudly serving Surrey since 1972, we’re a family-run glazing company offering quality windows, doors, conservatories, and bespoke glass solutions. Whether you’re upgrading your home’s look with double glazing, choosing a new front door, or planning a unique orangery, our team is here to bring your vision to life.
Flush casement or standard casement?
Both share the same performance. The difference is how the sash sits in the frame.
| Flush casement | Standard casement | |
|---|---|---|
| How the sash sits | Flush within the frame | Protrudes from the frame |
| Look | Streamlined, chamfered lines, period or contemporary | Traditional, defined sash lines |
| Maintenance | Low, won’t warp, rot or corrode | Low, won’t warp, rot or corrode |
| Best suited to | Period properties and modern homes wanting a slimmer look | Most properties |
Not sure which suits your house? Bring a photo of your elevation to the Guildford showroom.
Planning your next project? Check if we cover your area.
Sheerwater Glass proudly provides window and door installations, repairs, and glazing services throughout Surrey and the surrounding areas from our showrooms in Guildford and Woking.
To find out whether we cover your area, simply click the button below and check your postcode.
Styles and configurations
Clean, chamfered lines on the outside and a detailed finish with gently sculpted curves on the inside. Available in a variety of configurations to suit your property’s shape. Georgian bars and weather bars are available to complete the period look. Traditional peg stays and monkey-tail handles come in a range of finishes.
Colour Options
-
White
-
Tan
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Cream
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Brown
-
Agate Grey
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Windsor
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Grey
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Slate Grey
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Slate Grey Finesse
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Buckingham Grey
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Pebble Grey
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Basalt Grey Smooth
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Anthracite Grey Smooth
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Hazy Grey Finesse
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Anthracite Grey
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Steel Blue
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Swamp Oak
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Silver D Smooth
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Sage Smooth
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Rosewood
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Pyrite
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Honey Oak Super Matt
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Irish Oak
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Flemish Gold Smooth
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Dark Red
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Dark Green
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Cream White
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Black Ulti Matt
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Black Brown
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Claystone
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Chartwell Green
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AnTEAK
Aluminium flush casement specification
| System | To be confirmed |
|---|---|
| U-value | To be confirmed |
| Security | Can be specified to PAS 24, to be confirmed |
| Colours and finishes | White Gloss, Anthracite Grey Matt, Black Matt, any RAL colour |
| Guarantee | 10 years on frames, glass units and workmanship. 5 years on moving parts and hardware |
Hear from our customers
“Nick from Sheerwater Glass just finished fitting my windows – Great service, quick, efficient and very friendly. Definitely recommend.”
Deborah Proudfoot
Sheerwater Glass Customer
Your Glass Options
| Option | What it does | Standard or upgrade |
|---|---|---|
| Argon fill | Better insulation than air | Standard |
| Low emissivity coating | Reflects heat back into the room | Standard |
| Warm edge spacer bar | Cuts heat loss and condensation at the edge of the glass | Standard |
| Toughened safety glass | Required by Building Regulations in some positions. We will tell you where | Where required |
| Acoustic glass | Worth it on a main road, but only ever as good as the fabric of the building around it. Ask your adviser | Upgrade |
| Laminated security glass | Holds together if broken | Upgrade |
| Obscure and patterned | Bathrooms and overlooked windows | Upgrade |
| Leaded and Georgian bar | Period elevations and conservation areas | Upgrade |
| Upgraded thermal unit | Improves the U-value of the whole window | Upgrade |
| Triple glazing | Best performance, heaviest units. Available on selected frames | Upgrade |
Your guarantee
| Frames, glass units and workmanship | 10 years |
|---|---|
| Moving parts and hardware | 5 years |
| Insurance backed guarantee | QANW, as standard |
| FENSA certificate | Issued automatically on qualifying installations |
The insurance backed part matters: your cover survives even if we are not here to honour it, and we provide it even on installations that do not qualify for FENSA. Most local companies do not.
Aluminium flush casement windows: your questions answered
What is the difference between flush casement and standard casement?
A flush casement sash sits level within the frame when closed, rather than protruding from it, giving a smarter, more streamlined look.
Does aluminium flush casement need much maintenance?
No. Aluminium doesn’t absorb moisture, so it won’t warp, rot or corrode. A quick wipe down is usually all it takes to keep it looking as good as the day it was fitted.
Do I need planning permission?
Usually not, but you might if your house is listed or sits in a conservation area, and there are around 200 of those in Surrey. Flush casement is often chosen precisely because it suits these areas. We will flag it at survey if we think you are affected.
Will I get a FENSA certificate?
Yes, automatically, on every installation that qualifies. You will need it when you sell the house.
Can I buy the windows without installation?
Yes. We supply only if you are arranging your own fitting.
Ready to get a quote?
You’ll speak to a real person, not a call centre. We’ll talk you through options, no pressure.
Pricing, finance and page notes
* Prices are indicative starting prices, reviewed regularly. They are based on a 1200 x 1200mm window in white with one side hung opener, a fanlight and a fixed pane below, supplied and fitted including VAT, and an order of four windows to the same property. Colours and woodgrain finishes cost more.
** Finance is provided by Dopple, not by Sheerwater Glass. Sheerwater Glass Ltd is an Introducer Appointed Representative of Social Money Ltd, trading as Dopple, which is authorised and regulated by the Financial Conduct Authority, firm reference number 675283. We introduce you to Dopple and we do not lend or give credit advice. Applications are made through our finance portal and all lending is subject to status and affordability. Dopple provides the rate, the term options and a representative example before you apply.
Specifications vary by window style, so a figure given here for an aluminium flush casement window may not apply to another style, size or material. What governs your installation is the specification in your written quotation and signed contract. If a particular figure matters to your decision, ask your surveyor and we will put it in writing.
