Timber Flush Casement Windows

A flat, flush sash that sits within the frame rather than on top of it, in genuine timber. Traditional character with a smart, streamlined finish.

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, streamlined look that suits period and modern properties alike. In timber, that gives you the genuine period material with a genuinely modern finish.

From £2,900 per window, supplied and fitted, including VAT.*

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flush casement

From £2,900 per window*

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

A rated

U-values typically around 1.2 W/m²K, varying with size, glazing and configuration.

PAS 24 available

Enhanced security, specified on any window

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

flush casement flush casement timber windows

What timber flush casement windows cost

From £2,900 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. 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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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 flush casement

You want a smarter, slimmer look, in a genuine period material. Clean, chamfered lines outside and sculpted curves inside, rather than a sash sitting proud of the frame.

You want authentic hardware. Traditional peg stays and monkey-tail handles are available, in a choice of finishes.

You want it to suit a historic or contemporary property equally well. Flush casement keeps the traditional lines a period property expects.

You want proven performance behind the style. Reinforced frames, internal beading and multipoint locking as standard.

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Timber flush casement window security

A flush finish does not mean a compromise on security. Every timber 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
  • Reinforced frames as standard
  • Internal beading, so the glazing cannot be accessed from outside
  • Multipoint locking systems
  • Lockable handles

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.

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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
Hardware Peg stays and monkey-tail handles available Standard casement handles
Energy rating A A
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.

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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.

Farrow & Ball

Farrow & Ball Colour Chart

Slimline specification

Window Energy Rating A
U-value Typically around 1.2 W/m²K, varying with size, glazing and configuration.
Species and construction To be confirmed
Finish To be confirmed
Frame depth To be confirmed
Sightline To be confirmed
Maximum sash size 800mm wide x 1500mm high
Security Can be specified to PAS 24. Reinforced frames, internal beading,
multipoint locking, lockable handles.
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.

Timber 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. Both offer the same energy rating and security options.

Are timber flush casement windows secure?

Yes. Every window can be specified to PAS 24, the enhanced security standard Building Regulations require on new homes.

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?

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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 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.