From £1,249 per window*
Based on a 1800 x 1200mm window in white, fitted, inc VAT, based on 4 windows fitted.
Slimline uPVC Windows
The thinnest uPVC windows in the UK. 12% more glass, A+ rated, and the same price as a standard uPVC window.
Designed, supplied and fitted by our own team across Surrey, Berkshire, North Hampshire, Middlesex and West Sussex. Showroom in Guildford.
Slim frames used to mean aluminium, and an aluminium price. We designed Slimline to change that.
The frame is thinner than any other uPVC window on the market, so you get 12% more glass in the same opening, and it is the only window in our range rated A+.
From £1,249 per window, supplied and fitted, including VAT.*
A+ rated
The only A+ window in our range, with a 1.2 whole window U-value
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 Slimline windows cost
From £1,249 per window, supplied and fitted, including VAT.* Four windows on that basis are £4,996.
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 |
You get a fitting date when you order, not a window of weeks. If a delivery slips, we call you before you have to call us.
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 Slimline
You want more light. A thinner frame means a bigger pane in the same opening. Across a run of windows on the front of a house, the difference is easy to see.
You want the aluminium look without the aluminium price. Slim sightlines used to be an aluminium only feature.
You do not want to trade performance for looks. The outer wall is 3mm against a 2.8mm industry standard. The frame is thinner and stronger, not thinner and weaker.
You want the whole house to match. Slimline is designed alongside the rest of our range, so a new front door will match your new windows.
Slimline window security
A slim frame does not mean a compromise on security. Every Slimline 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 | £1,249 | £1,249 | £2,099 |
| Energy rating | A+ | A | A |
| U-value | 1.2 | Ask your surveyor | 1.3 to 1.4 |
| Frame depth | 63mm | 70mm | Ask your surveyor |
| Glass area | 12% more | Baseline | Most |
| Largest openers | 700 x 1500mm | Larger | Largest |
| Flush casement | No | Yes | Yes |
Slimline wins on glass area and rating at the same price as standard uPVC. Standard uPVC wins on larger openers and flush sashes. 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.
Slimline is not available as a flush casement. If you want a sash that sits flush within the frame, our flush casement range does that in uPVC, timber and aluminium.
Colour Options
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Brown
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Cream
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Grey
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Tan
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White
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Slate Grey
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Steel Blue
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Swamp Oak
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White
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Windsor
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Slate Grey Finesse
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Silver Smooth
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Sage
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Rosewood
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Pyrite
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Kensington Grey
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Honey Oak Super Matt
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Hazy Grey Finesse
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Irish Oak
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Pebble Grey
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Golden 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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Buckingham Grey
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Claystone
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Chartwell Green
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Anthracite Grey
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Basalt Grey Smooth
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Anthracite Grey Smooth
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Anteak
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Agate Grey
Slimline specification
| Window Energy Rating | A+ |
|---|---|
| U-value | 1.2 W/(m2K) whole window. Upgradable to 1.0 |
| Sealed unit | 28mm minimum, argon filled, low emissivity coated, warm edge spacer bar |
| Frame depth | 63mm minimum |
| Sightline | 128mm |
| Outer wall thickness | 3mm, against a 2.8mm Class A industry standard |
| Maximum sash, side hung | 700 x 1500mm |
| Maximum sash, top hung | 1200 x 1200mm |
| Opening angle | 90 degrees |
| Security | Can be specified to PAS 24. Trojan shootbolt locking to BS7950 |
| Reinforcement | Reinforced frames as standard |
| Colours and finishes | 34, including 8 woodgrains |
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
Choosing your glass
Every Slimline window comes with a 28mm argon filled, low emissivity unit and a warm edge spacer bar as standard. You are not paying extra to reach a decent starting point.
| 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 | Takes the whole window to a 1.0 U-value | Upgrade |
| Triple glazing | Best performance, heaviest units | 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 Slimline uPVC windows cost?
From £1,249 per window, supplied and fitted, including VAT, on the basis set out above. Prices are indicative and your quotation is the accurate figure.
Can you match my existing windows and doors?
Usually. Slimline is designed alongside the rest of our range, so a new front door will match. If you are replacing in phases we record your finish so the second phase matches the first. 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. 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, and we hold a copy in your customer portal.
What happens if something goes wrong in a few years?
Call us. Your workmanship, frames and glass are covered for 10 years and moving parts for 5, backed by a QANW insurance backed guarantee. The Glass and Repairs Surgery at the Guildford showroom is open Tuesday and Thursday afternoons and Saturday mornings.
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 an 1800 x 1200mm window in white with two side hung openers, 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 Slimline 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.
