Sash window companies

We track down the nation’s finest sash window makers and restorers

white wall with and wooden floor and large window
(Image credit: TBC)

Osmond Flatts, Lartington, Barnard Castle, County Durham DL12 9DG,
Based in Teesdale but willing to travel anywhere in the UK, Alan Heavisides has a large, fully equipped workshop that makes and renovates traditional box sash windows that are double-glazed to meet modern building regulations. By retaining a 22mm-wide glazing bar, the company ensures its windows always look proportional and traditional. All windows are made to order within four to six weeks, if possible, and the company employs an in-house fitting team.

406/408 Merton Road, London SW18 5AD,
As well as offering a wide range of bespoke sashes within London and the home counties, this company will design and construct one-off sash windows. Georgian bars, double or single glazing and curved or arched designs are all catered for. Once approved, windows are delivered in eight to ten weeks. Glass options include obscure, toughened, cool glass and acoustic. FENSA-registered installation is available. (FENSA, the Fenestration Self-Assessment Scheme, means companies can certify their windows comply with building regulations.)

Unit 30, Yew Tree Courtyard, Earl Soham, Woodbridge, Suffolk IP13 7SG,
This company was recently established by carpenters Marcus Church and Stuart Gooderham, who combine more than 30 years’ experience in traditional bespoke joinery. Specialising particularly in sash windows, they reproduce the mouldings and detailed characteristics of timber windows using traditional woodworking methods, to recreate authentic replacement sash windows. They also offer a renovation service and will travel nationwide.


Unit 4c, Cockshades Farm, Stock Lane, Nantwich, Cheshire CW5 7HA,
Specialising in the refurbishment of sash windows on-site, this company has a team of craftspeople on the road, as well as a window workshop for major renovation projects and bespoke reproductions. It can also supply and fit faithful single-glazed reproduction sash windows. Operating in Cheshire, North Staffordshire, Shropshire and surrounding areas, it has recently opened a branch in Llandudno to cover North Wales.

Tower Business Park, Kelvedon Road, Tiptree, Essex CO5 0LX,
Mumford & Wood produces single- and double-glazed wooden spring and box sash windows that conform to modern building and environmental standards. The sash windows are made from sustainably sourced laminated larch, giving an almost knot-free surface and superior stability. Installation is included.

29/30 The Arches, Alma Road, Windsor, Berkshire SL4 1QZ,
This company has patented designs for creating new sash windows that meet modern regulations, including its unique sealed glass units, which, coupled with slim timber glazing bars, reduce the visual impact of double-glazed glass in a period home. The company offers installation throughout the South-east.


Queens Joinery, Queens Road, Twickenham, Middlesex TW1 4LJ,
This FENSA-registered company hand-builds traditional cord- and weight-operated sash windows. Specialising in conservation projects, it has 15 years’ experience of working on heritage properties. It also has sound eco-credentials and recently won the Green Guardian Award for helping to reduce the Royal Borough of Richmond’s carbon footprint.

Unit 4, Kiln Lane, Bracknell, Berkshire RG12 1NA,
Replacing or restoring thousands of windows every year, this FENSA-registered company will also draught-seal existing sash windows to reduce rattling and improve insulation. Each window is bespoke and comes with a 20-year warranty. A free no-obligation survey is also available.

Unit 4, Clarkes Industrial Estate, Sutton Coldfield, West Midlands B73 5TS,
This family firm is always incredibly busy, so you may need to wait between eight and 12 weeks for your windows, but its work is highly recommended. Choose from good-quality softwoods, or hardwoods such as mahogany and oak, all of which are from renewable sources. Features include single or double glazing, locking catchments, draughtproofing and the option of sash stops, which restrict opening for child safety. Windows are finished with a wood preserver and primer, ready to be painted on-site.


Bishopsland Farm, Dunsden, Reading, Berkshire RG4 9NR,
Willowside Joinery provides an installation service covering London, the home counties, Hampshire and Oxfordshire, and a “supply-only” service nationwide. It specialises in listed buildings and properties within conservation areas, and can create replicas of originals, guaranteed to impress your planning officer. All sash windows are hardwood and installed with a ten-year guarantee. The company also offers draught-sealing and full renovation services.

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