Window styles
Triple glazed flush casement windows
Flush sashes give a neater, more traditional face than standard casements, which is why they suit cottages, Edwardian homes and conservation areas. They come in uPVC with woodgrain finishes, in timber, and in aluminium.
Summary
A flush casement window has sashes that close flush with the outer frame instead of overlapping it, copying the look of traditional timber windows. Triple glazed flush casements combine that period look with a three-pane sealed unit.
What you get
| Look | Sash closes flush with the frame |
|---|---|
| Frames | uPVC (woodgrain), timber or aluminium |
| Glass | Triple unit, argon filled, two low-e panes |
| Hardware | Monkey-tail, butt hinges, or modern handles |
| Colours | Heritage greens, creams, greys, woodgrains |
| Typical lead time | 5 to 8 weeks |
Guide prices
Guide prices per window, supply and fit, including removal of the old window.
Small window
about 600 x 1000 mm (bathroom, landing)
£845 – £1,095inc VAT · £705 – £910 ex VAT
- uPVC frame, triple glazed, warm-edge spacers
- Removal and disposal of the old window
- Fitted, sealed and made good inside and out
Medium window
about 1200 x 1200 mm (bedroom)
£1,195 – £1,495inc VAT · £995 – £1,245 ex VAT
- uPVC frame, triple glazed, warm-edge spacers
- Removal and disposal of the old window
- Fitted, sealed and made good inside and out
Large window
about 1800 x 1200 mm (lounge)
£1,795 – £2,195inc VAT · £1,495 – £1,830 ex VAT
- uPVC frame, triple glazed, warm-edge spacers
- Removal and disposal of the old window
- Fitted, sealed and made good inside and out
Guide prices, supply and fit. The written quote after your survey fixes the price for the specification shown; anything extra is agreed with you first.
Is it right for your home?
A good fit for
- Cottages and period homes
- Conservation areas that ask for a traditional look
- Homeowners who want a softer, neater face
Think twice if
- Very large sashes, where weight needs checking
- Tight budgets, as flush costs more than standard casements
Options
- Woodgrain uPVC or painted timber
- Astragal bars on the glass
- Monkey-tail or Ironbridge-style handles
- Butt hinges for a timber look
- Matching flush doors
Why flush sashes suit older homes
Before uPVC, most timber casements were flush. Standard uPVC casements overlap the frame, which looks bulkier. A flush sash removes that step, so the window looks closer to the original. In conservation areas, that can make the difference between a straightforward approval and a refusal.
Weight and hardware
The flush design hides the hinge line, so hardware has to be chosen for the triple glass weight. We use systems rated for the unit, and fit restrictors and escape hinges where needed.
Building Regulations by nation
| Nation | Replacement windows | Sign-off |
|---|---|---|
| England | 1.4 W/m²K, or a Window Energy Rating of band B or better | Competent person scheme or building control |
| Wales | 1.4 W/m²K, or a Window Energy Rating of band B or better | Competent person scheme or building control |
| Scotland | 1.6 W/m²K | No building warrant for a straight replacement; must meet the standards |
| Northern Ireland | 1.6 W/m²K, or a Window Energy Rating of band C or better | No building notice for a straight replacement; must comply |
Full regulations guide, with sources →
Questions about flush casement windows
Are flush casements more expensive?
Yes. Our guide puts them about 30% above a standard uPVC casement of the same size.
Can flush casements be triple glazed?
Yes. The frame depth and hardware are chosen for the unit weight; we confirm the exact unit on your quote.
Will they be accepted in a conservation area?
Flush designs are often the closest match to original timber windows, but each council decides. See our conservation guide and check any Article 4 direction.
What colours are available?
Woodgrain foils and heritage colours in uPVC, and any paint colour in timber or RAL colour in aluminium.
Related products
Period homes and conservation areas
From £1,295Heritage-style frames, and straight advice on what your council will accept.
Learn more →
Timber windows
From £1,295Engineered timber frames, factory finished, for period homes and natural looks.
Learn more →
Casement windows
From £695The standard side- or top-hung UK window, with a three-pane unit.
Learn more →
Sash windows
From £1,295Vertical sliding sashes for Victorian and Georgian homes, where the design allows.
Learn more →Flush casement windows by area
England
- Bedfordshire
- Berkshire
- Bristol
- Buckinghamshire
- Cambridgeshire
- Cheshire
- Cornwall
- County Durham
- Cumbria
- Derbyshire
- Devon
- Dorset
- East Riding of Yorkshire
- East Sussex
- Essex
- Gloucestershire
- Greater London
- Greater Manchester
- Hampshire
- Herefordshire
- Hertfordshire
- Isle of Wight
- Kent
- Lancashire
- Leicestershire
- Lincolnshire
- Merseyside
- Norfolk
- North Yorkshire
- Northamptonshire
- Northumberland
- Nottinghamshire
- Oxfordshire
- Rutland
- Shropshire
- Somerset
- South Yorkshire
- Staffordshire
- Suffolk
- Surrey
- Tyne and Wear
- Warwickshire
- West Midlands
- West Sussex
- West Yorkshire
- Wiltshire
- Worcestershire
Scotland
Flush casement windows: get your guide price
Use the guide-price tool, or book a free survey for a written quote that fixes the price.