Replacing Traditional Wooden Sash & Casement Windows

At Barnsbury Joinery we manufacture and install traditional wooden sash and casement windows in our factories based in Crouch End, North London and Reading, Berkshire. Our timber sash windows are manufactured to replicated your original windows, but with slight modifications made to improve the original design. Typically this would be with better ironmongery and locking systems, draught proofing system inserted into new staff and parting bead as standard and also the options to upgrade to double glazing windows or slimline double glazing windows. With our double glazed sash and casement windows we provide a traditional putty finish externally. This is normally required if your property is located in a conservation area so your sash and casement windows look exactly the same as the original design. 


Usually all new sash and casement windows are glazed with 24mm double-glazed low-emissivity glass to comply with the thermal requirements demanded by current building regulations and local councils. Occasionally the local planning authority will insist that new sash or casement windows are single glazed to maintain the authenticity of the façade of a listed building – this will over-ride the demands of the building regulations. At Barnsbury Joinery we manufacture both single glazed and double glazed windows in any size or style. Our sash windows are manufactured using the traditional haunched mortise and tenon joints, which gives your sash windows far more strength than those favoured by the mass produced markets in the UK and also windows imported from Europe.  This attention to detail makes a huge difference to the quality of the end product, and ensures your sash windows will last far longer.

Our replacement sash windows are:

Our replacement casement windows are:

The casement windows we manufacture and install have the latest locking systems, with a wrap-around roller locking system used for opening sashes. Our casement windows are designed to have the traditional appearance of hardwood, blending new CAD technology with traditional joinery methods. Choose from a range of Idigbo, Sapele or Oak stains or opaque colour's. We also have sustainable timbers options for manufacturing your casement windows.

Our casement windows have twin gaskets for maximum protection against the weather, which lowers the heat loss through the frame and the casement. The casements can open with either our standard handles or with a traditional range of decorative handles available on request. We can incorporate traditional monkey tail handles or bulb end handles, in a range of colour's to compliment your design and colour of casement window.

All the windows we supply are manufactured to the highest standards with specifications to match, generic specifications are below (specification relative to design).

  • Flush or Stormproof (over-rebated) window systems available

  • Wrap-around, multi point espagnolette locking system as standard

  • Top or side opening sashes

  • Dummy (non-opening) sashes or direct-glazed sections available

  • Option of increasing component thicknesses in order to give equal sight-lines with adjacent doors etc.

  • Arched or swept heads available

  • Windows can be incorporated into bays, conservatories and orangeries

  • Range of hinge options available, including approx. 90° opening for fire escape windows, child restriction for safety, “easy clean” mechanism, or combinations of these (depends on window size and configuration)

  • Very large and very small opening casements achievable, with a wider range of sizes available than many of our competitors

  • Colour-matched internal window boards available


























































For further information or if you have any questions regarding the replacement of your sash and casement windows please contact us at: or call our head office on: 0207-1646305


UK - London 

UK - Hertfordshire

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Barnsbury Joinery Co.

UK Head Office 

Ripplevale Grove, 

Islington, London. 


Tel:   0207-1646305

Mob: 07399779872

Mob: 07913372092



Barnsbury Joinery Co.

Hertfordshire Head Office 

Blacksmiths Lane, 

St Albans. 


Tel:   0207-1646305

Mob: 07399779872

Mob: 07913372092

Barnsbury Joinery Co. © 2020 London's Leading Bespoke Joinery Company. All rights reserved.