Timber Alternative Casement Windows

The look of timber, the proven performance of our standard uPVC casement. A rated, PAS 24 available, and none of the upkeep solid timber demands.

Designed, supplied and fitted by our own team across Surrey, Berkshire, North Hampshire, Middlesex and West Sussex. Showroom in Guildford.

Timber alternative gives you the character of a traditional timber window, built on the same 70mm, six chamber profile as our standard uPVC casement. No sealing, painting or sanding, and it costs less than solid timber.

From £1,449 per window, supplied and fitted, including VAT.*

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upvc timber alternative casement windows

From £1,449 per window*

Based on a 1200 x 1200mm window, fitted, inc VAT, based on 4 windows fitted

A rated

1.2 whole window U-value, same as our standard uPVC casement

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

Timber double glazed Windows Timber Silk Grey Flush Casement

What timber alternative windows cost

From £1,449 per window, supplied and fitted, including VAT.* Four windows on that basis are £5,796.

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. Every opening is different, and your quotation is the accurate number, free of charge.

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.

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Timber double glazed Windows

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 timber alternative

You want the look of timber without the upkeep. It won’t rot, warp, or need regular sanding and repainting. Occasional cleaning is all it asks for.

You want proven performance, not a new material. It’s built on the same 70mm, six chamber profile as our standard uPVC casement, with the same A rating and 1.2 U-value.

You want the character of timber at a more accessible price. It costs less than solid timber, and still adds real value to your home.

You want security that does not look like security. Every window can be specified to PAS 24, with reinforced frames and multipoint locking as standard.

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Timber alternative 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.

  • Can be specified to PAS 24, the enhanced security standard used by Building Regulations
  • Trojan multi point shootbolt locking, tested to BS7950
  • Reinforced frames and internal beading
  • Hinge protection against jemmying
  • Lockable handles

Tell your surveyor if security is a priority and we will specify accordingly.

Timber Silk Grey Flush Casement

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.

Read our Story Tour our Showroom

Timber or timber alternative?

Both give you the same traditional character and the same A energy rating. The difference is upkeep and price.

Timber Timber alternative uPVC
From, per window £2,800 £1,449
Energy rating A A
Maintenance Regular sealing or painting Occasional cleaning only
Won’t rot or war Depends on care and finish Yes, by design
Adds property value Yes Yes
Look Solid timber Built to replicate timber’s character

Timber alternative gives you the same look for less money and less upkeep, built on the same proven profile as our standard uPVC casement. Solid timber is the choice if you want the real material itself.

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.

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.

See our flush casement windows

Farrow & Ball

Farrow & Ball Colour Chart

Timber alternative specification

Window Energy Rating A
U-value 1.2 W/(m2K) whole window, as standard
Material and construction uPVC profile with a woodgrain foil finish, the same core system as our standard uPVC casement
Sealed unit 28mm minimum, argon filled, low emissivity coated, warm edge spacer bar
Frame depth 70mm, six chamber
Maximum sash, side hung 3mm, against a 2.8mm Class A industry standard
Maximum sash, side hung 800mm wide x 1500mm high
Maximum sash, 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, tested to BS7950
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

Choosing your glass

Every timber alternative window comes with a 28mm argon filled, low emissivity unit and a warm edge spacer bar as standard, the same as our standard uPVC casement.

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

Is timber alternative the same as your standard uPVC casement?

Essentially, yes. It shares the same 70mm, six chamber profile, 1.2 U-value and A energy rating, finished with a woodgrain foil that gives the look and texture of timber.

How is timber alternative different from solid timber?

Timber alternative gives you the same traditional look at a lower price, from £1,449 per window against £2,800 for solid timber, and needs far less upkeep. It won’t rot or warp, and only needs occasional cleaning rather than the regular sealing or painting solid timber requires.

Are timber alternative windows secure?

Yes. Every window can be specified to PAS 24, the enhanced security standard Building Regulations require on new homes, with Trojan multi point shootbolt locking tested to BS7950.

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.

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.

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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 timber alternative 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.