From £900 per window
Based on a 1200 x 1200mm window in white, fitted, inc VAT, based on 4 windows fitted
uPVC Casement Windows
A rated, the same price as Slimline, and available with larger openers and as a flush casement.
Designed, supplied and fitted by our own team across Surrey, Berkshire, North Hampshire, Middlesex and West Sussex. Showroom in Guildford.
Not every homeowner needs the thinnest frame on the market. Our standard uPVC casement gives you the same starting price as Slimline, a wider range of opening sizes, and the option of a flush casement finish where Slimline does not go.
From £900 per window, supplied and fitted, including VAT*.
A rated
1.2 whole window U-value, same as Slimline
PAS 24 available
Enhanced security, specified on any window
Quote in 4 working days
Home visit in 2, written quote 2 after that
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 uPVC casement windows cost
From £900 per window, supplied and fitted, including VAT.* Four windows on that basis are £4,996. That is the same starting price as our Slimline window.
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.
Colours and woodgrain finishes cost more.
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 standard uPVC
You want the widest range of sizes. Larger openers than Slimline can take, so it is the right choice for bigger windows and unusual openings. Ask your surveyor for the maximum size for your opening.
You want a flush casement option. If you want a sash that sits flush within the frame rather than protruding, this range does it. Slimline does not.
You do not want to pay more than you need to. It costs the same as Slimline, starting at £900 per window, and needs the same almost non existent upkeep.
You want the whole house to match. This range is designed alongside the rest of ours, so a new front door will match your new windows.
uPVC casement window security
A well specified frame does not mean a compromise on security. Every window can be specified to PAS 24, the enhanced standard Building Regulations require on new homes, which means it has been physically attacked under test conditions and held.
- Trojan multi point shootbolt locking, tested to BS7950
- Security glazing as standard, so the unit cannot be removed from outside
- Hinge protection against jemmying
- Reinforced frames and internal beading
- Laminated security glass 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.
Slimline, standard uPVC or aluminium?
Three things usually decide it: how slim you want the frame, how much you want to spend, and how much upkeep you are willing to do.
| Slimline uPVC | Standard uPVC | Aluminium | |
|---|---|---|---|
| From, per window | £900 | £900 | £1,580/td> |
| Energy rating | A+ | A | A |
| U-value | 1.2 | 1.2 | 1.3 to 1.4 |
| Frame depth | 63mm | 70mm | From 64mm |
| Glass area | 12% more | Baseline | Most |
| Largest openers | 700 x 1500mm | Larger | Largest |
| Flush casement | No | Yes | Yes |
Standard uPVC wins on larger openers and flush sashes, at the same price as Slimline. Slimline wins on glass area and rating. Aluminium takes the biggest spans, though it is not the warmer option.
Not sure? 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
Side hung, top hung and fixed lights in any combination. Bay and bow windows. Arched and shaped heads. Georgian and leaded designs. A cat flap fitted into the glass. Trickle vents where Building Regulations require them.
This range is also available as a flush casement, sitting flush within the frame rather than protruding when open. See our flush casement range for that option in more detail.
Colour Options
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White
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Tan
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Cream
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Brown
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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
Slimline specification
| Window Energy Rating | A+ |
|---|---|
| U-value | 1.2 W/(m2K) whole window, as standard |
| Sealed unit | 28mm minimum, argon filled, low emissivity coated, warm edge spacer bar |
| Frame depth | 70mm, six chamber |
| Maximum sash, side hung | Maximum size for side hung: 800mm wide x 1500mm high. |
| Maximum sash, top hung | Maximum size for top hung: 1200mm wide x 1200mm high. |
| Opening angle | 90 degrees |
| Flush casement option | Available. See our flush casement range |
| Security | Can be specified to PAS 24. Trojan shootbolt locking to BS7950 |
| Reinforcement | Reinforced frames as standard/td> |
| Colours and finishes | 34, including 8 woodgrains |
| 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.
Questions we get asked
How much do uPVC casement windows cost?
From £900 per window, supplied and fitted, including VAT, on the basis set out above. That is the same starting price as our Slimline window. Prices are indicative and your quotation is the accurate figure.
Is standard uPVC cheaper than Slimline?
No, they start at the same price. Slimline gives you around 12% more glass and an A+ rating rather than A. Standard uPVC gives you a wider range of sizes and the option of a flush casement.
Can you match my existing windows and doors?
Usually. This range is designed alongside the rest of ours, so a new front door will match. Bring a photo to the showroom and we will tell you honestly whether we can match what you have.
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. 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.
What happens if something goes wrong in a few years?
Your guarantee covers you: 10 years on frames, glass units and workmanship, 5 years on moving parts and hardware, backed by insurance that survives even if we are not here to honour it.
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 a standard uPVC casement 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.
