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Replacement Period Windows & Doors

New Wooden Sash Windows. Bespoke Timber Doors

Bespoke replacement timber windows & doors, hand finished authentic period joinery,   The design principals of traditional timber joinery combined with the performance and security you would expect of a modern window.

Incorporating time proven construction methods, such as mortise and tenon joints, combined with modern advances like Accoya wood, our joinery is built to last a lifetime. 

Bespoke period window | sash window specialist berks, london & south

From a rotten sash to an intricate bay window, if the wood has rotten past economic repair then we offer custom made timber replacement windows & doors.  Authentically copied from the original frames by carefully replicating horn shape, moulding and sectional details.  Our Authentic Replicas are suitable for conservation areas and listed buildings.

Traditionally constructed with mortise & tenon joints that are bonded with modern glues ensures that our joinery is of the highest quality possible.  All replacement joinery is supplied incorporating draught seals as standard.

Our replacement period window & door service includes:

  • Survey of the existing frames
  • Removal of the old windows
  • Replacement replica joinery
  • Architraves, nosing, liners and beading.
  • Optional paint finish


Replacement windows and doors that reflect a bygone era; both in looks and manufacture techniques.  

Bespoke Timber Windows & Doors | Sash Window Specialist UK & AU

Our sash window workshop manufactures bespoke timber windows & doors in any style, constructed using traditional mortise & tenon joints.  Suitable for conservation areas and listed buildings.

Bespoke Timber Windows & Doors | Sash Window Specialist UK & AU
Bespoke Timber Windows

Draught seals are machined into the timber components to become an integral, practically invisible part of the windows or door.  Brush draught seals are the best option for a sliding sash window but compression weather seals are better suited to doors.

Blending the latest advances of building technology into period homes

bespoke French windows / french doors | double glazing & draught seal


Timber Selection


accoya wood for sash windowsAccoya® wood is the

perfect material for most wooden window frames and external wooden doors as it offers improved thermal insulation properties in comparison with commonly used hardwood and softwood wood species and it is more durable and dimensionally stable than the best tropical hardwoods. Accoya® wood has an enhanced coatings performance and can last twice as long, saving time, money and hassle.


It also has a 50 year above ground guarantee, giving complete confidence that Accoya® windows and doors will stand the test of time. An Accoya® wooden window or door is developed to excel in external applications, even in challenging conditions.


Bespoke joinery from a range of other premium timbers. 

Redwood pine timber used for wooden sash windows, casement windows and doors. Douglas Fir premium softwood timber used for wooden sash windows, casement windows and doors. Oak hardwood timber used for wooden sash windows, casement windows and doors. Meranti hardwood timber used for wooden sash windows, casement windows and doors. Mahogany hardwood timber used for wooden sash windows, casement windows and doors. Jarrah hardwood timber used for wooden sash windows, casement windows and doors. Accoya modified softwood timber used for wooden sash windows, casement windows and doors. Choose Accoya for long life, durablity and eco friendly. Guide to Timber Type



Wide choice of glazing

  • Argon filled DGU for better energy efficiency
  • Acoustic DGU configuration.
  • ‘Low E’ energy efficient glass.
  • Etched or patterned glass.
  • Safety Glass.
  • Laminated Glass
  • Slimlite units or duplex bars.
  • 5 – 16 mm spacer bars depending on the sash thickness.

Window Security & Hardware

Sash Window Renovation. | Double Glazed Timber SashDouble Glazed Wooden Sash Window. Double Glazed Sash Window.

Various catches effectively bring the sashes into a locked position, however the screws holding these in place are small and these catches should not be considered an effective security measure. We have a range of sash window security options available.  We also supply a wide range of sash window furniture, available in variety of finishes.


Sealing draughts in your home will return significant savings in heating and cooling costs, as up to 25% of heat is lost via air leakage in a typical home.

Bespoke period sash windows can reduce the draughts by almost 90%, therefore significantly reducing the air cooling or heating requirement needed for the room.  Warm or cold draughts make air cooling and heating systems work harder and make occupants feel uncomfortable, often adjusting room thermostats to compensate.  

Wood is a natural insulator

The natural insulating properties of timber make this an extremely energy efficient building material.  Timber window frames are highly energy efficient as they do not conduct heat. 

Timber windows help to lower your carbon foot print. 

Wood is a sustainable building material, derived from a renewable source. Any home owner choosing green living should consider preserving or reinstating timber windows.    

How Does low-emissivity glass work?

low e glass for period casement and sash windows

Low-e glass has a special coating which is a poor radiator of heat and does not allow heat to be transferred through the glass. In winter, heating is reflected back indoors; in summer heat from the
sun is reflected away, keeping the room cooler


UK - FENSA, Document L & The Building Regulations?.