Trade uPVC flush sash windows
Flush sash windows close into the frame so the sash face sits level with it, the way traditional timber casements do. They suit older houses, conservation-sensitive streets and any job where the client wants the look of timber without the upkeep.
- Product code
- TG-W02
- Guide trade price
- £240 to £520 per window, ex VAT, supply only
- Lead time
- uPVC windows are typically made in 3 to 4 weeks from a confirmed order.
- Delivery
- UK-wide to site, yard or unit, priced on your quote
- Category
- Windows
Typical layout. W and H are the frame or glass sizes you give us.
What is in the specification?
- Flush-fitting sashes in a deep uPVC frame
- Mechanically jointed or welded corners depending on the system
- Double glazed as standard, triple glazing available
- Butt hinges or friction hinges
- Multi-point locking with heritage-style handle options
- Woodgrain foils in cream, white and colours
- Matching run-through sashes for a balanced sightline
- Trickle vents concealed in the frame where specified
Options you can add
- Heritage butt hinges
- Monkey-tail or pear-drop handles
- Astragal bars
- Run-through sashes
- Colour both sides
- Acoustic or obscure glass
Who orders trade uPVC flush sash windows?
Mostly window and door installers, builders and main contractors and landlords and property managers. Typical uses include victorian and edwardian houses; cottages and character properties; upgrades where a timber look is wanted.
A flush sash window is usually chosen for how it looks, so the details matter: hinge type, handle style, glazing bars and the woodgrain finish are all listed separately on your quote so nothing is left to assumption.
Because the sash sits inside the frame rather than over it, flush sash windows need slightly different frame depths and fixing positions. We confirm the frame depth on the quote so you can plan the fixing before the windows arrive.
Woodgrain foils come in several shades of cream, white and colours. If you are matching existing windows on the same property, send a photo with your schedule and we will tell you which finish is closest.
Many period houses are in conservation areas or are listed. Planning rules for windows are set by the local council, so check with the planning department before ordering for those properties.
How should you measure?
Flush sash frames are deeper than standard casements, so check the reveal depth and any existing timber sub-frame before you finalise sizes, and note it on your schedule.
Which building regulations apply?
Replacement windows in England should meet Approved Document L: a U-value of 1.4 W/m²K or a Window Energy Rating of band B. Approved Document F expects background ventilation to be no worse than before, which usually means trickle vents. Glazing in critical locations must break safely, be robust or in small panes, or be permanently protected under Approved Document K, which in practice usually means toughened or laminated safety glass. Rooms that need an escape route may need an escape window under Approved Document B. Replacing windows is notifiable building work: the installer self-certifies through a competent person scheme such as FENSA or Certass, or the work goes through building control.
Wales
In Wales the Welsh Government's own Approved Documents apply. Replacement windows must meet the thermal values in Approved Document L (Wales), which differ from England in places, and safety glazing in critical locations is covered by Approved Document N in Wales. Replacing windows is notifiable building work, normally self-certified by an installer registered with a competent person scheme or approved by building control.
Scotland
In Scotland the Building (Scotland) Regulations and the Technical Handbooks apply. Replacing windows in a house does not normally need a building warrant, but the new windows must still meet the building standards, including the energy standards in Section 6 and the safety glazing standard in Section 4. Listed buildings and conservation areas have their own controls, so check with the local authority.
Northern Ireland
In Northern Ireland the Building Regulations (Northern Ireland) apply, with guidance in the Technical Booklets: Booklet F1 covers energy in dwellings and Booklet V covers glazing safety. Contact your council's building control service before replacing windows to confirm what application is needed.
More detail: Approved Document L guide safety glazing guide. Your installer or designer remains responsible for compliance and any notification.
How ordering works
List what you need
One line per window, door or unit, with width, height and finish.
Check your quote
We price each item and flag anything that needs clarifying.
Confirm the order
Production starts only after you approve the written order.
Receive your goods
We aim to deliver on the confirmed date; check the goods against the delivery note.
Questions trade customers ask
What is the difference between flush sash and standard casement windows?
On a standard casement the sash sits proud of the frame. On a flush sash it closes into the frame so both faces are level, which gives the look of a traditional timber casement.
Can flush sash windows be used in a conservation area?
Sometimes. Whether uPVC is acceptable is a planning decision for the local council, so check with them before you order for a property in a conservation area or a listed building.
Are flush sash windows more expensive?
Yes, they generally cost more than standard casements because of the deeper profile, the hardware and the foils. Our guide price range reflects that, and your quote shows the price per window.
Can you supply matching doors?
We can quote flush-style doors and French doors on the same order so the finishes match. Ask when you send your schedule.
Trade uPVC flush sash windows by area
Area pages cover delivery and the regulations that apply where the job is.