Repair Casement Windows

Period Casement Window Renovation services include draught sealing, repair, glazing upgrades, double glazing & bespoke replacement casement windows.

Period Casement Window Renovation services include draught sealing, repair, glazing upgrades, double glazing & bespoke replacement casement windows.

Draughty, binding or inoperable period casement windows are a familiar problem for owners of period properties.  

Casement Window.

Draught Seal & Restore

Draught Seal & Restore is our core casement window repair & recondition service and should be considered an essential upgrade for all existing period case windows. 

A recondition and draught seal service will restore your casement windows to proper working order, stopping rattles and controlling those intrusive cold draughts.  By controlling the draughts it also reduces the airborne noise & dust being carried into your home.

Draught-Seal benefits include:

Sash Weather & Draft Seals.

  • Primarily they seal the gaps where draughts enter, thereby improving the comfort & energy efficiency of your home & saving you money on energy bills.
  • Low friction draught seals enable free movement of the casement, yet are tight enough to eliminate intrusive rattles.
  • Air borne noise, dust and other pollutants that are suspended within draughts are also greatly reduced.

“ …one of the best and least intrusive ways of achieving improved performance from windows in old buildings. This will considerably reduce heating bills and energy use… reduce noise and dust ingress… Most importantly, draught proofing does not damage the visual aesthetics of an old building.”

English Heritage Framing Opinions Campaign

Draught Seal & Restore service is a full recondition of the casement window, restoring full and proper functionality plus the installation of our high performance, concealed draught seals. 

Repair Casement Windows 1

Our ‘Recondition & Draught Seal’ procedure for period casement windows includes:

  • Inspection & securing of the frame joints
  • Our discreet draught seals machined into the perimeter
  • Re-fitting of the frame to suit the opening
  • Service of the hinges to ensure ease of operation
  • Service of the furniture to ensure correct alignment.

Upgrade Casement Glass

Period casement window replacement glass | Sash Window Specialist London & BerkshireGlazing upgrades with energy efficient laminated glass, retro fitted into existing window frames, will improve the thermal & acoustic insulation of your home.  In some cases it is even possible for us to convert existing single glazed casements to accept double glazed units.

Glazing options include

  • Double Glazed Units
  • Laminate & Toughened Safety Glass
  • Patterned Glass
  • Etched Glass
  • ‘Low E’ Energy Efficient Glass 
  • Acoustic Glass

Double Glazed Casements

We also supply & install authentic wooden replica casements into existing timber frames, paint finished and double glazed with energy efficient (low E) glass. 

Bespoke Casement Windows

We carefully reproduce a copy of the original casements, paying close attention to moulding & sectional details.

Bespoke Joinery | Round Window Double Glazed | Pangbourne, Berkshire UK

Single or double glazing available.

Glazing bars may be either bonded with duplex bars or as individual Slimlite sealed units.

Offered in a wide range of timbers inc. Meranti,Oak,Sapele, Douglas Fir, Accoya™.

Accoya Wood has a 50 year above ground guarantee, giving complete confidence that Accoya® windows and doors will stand the test of time.

accoya wood for sash windows


We understand the charm of traditional wooden windows and our work is designed to be as sympathetic as possible.

Casement Window Restoration & Draught Proofing | Sydney Sash Window Specialist

Our draught seals are machined into the timber components to become an integral, practically invisible part of the window. Our Draught Seal & Restore Service is ideal for conservation areas and listed buildings.

We have been using the same top quality British made draught seals for over 20 years.  Brush draught seals are the best option for long life in a sliding sash window.

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.

Period casement windows are not regarded as being very energy efficient.  The casement window frames have inherent gaps that allow the glazed case frames to swing open and the timber frames can also warp over time, creating larger gaps where air leakage and air infiltration originate.  

Draught-stripping your existing period casement windows can reduce the draughts from them 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.  

Heat also passes through the glass itself but less than a quarter of the heat transfer through a typical period window is by conduction, the rest is by air infiltration - draughts.   Heavy curtains or close-fitting roller blinds can help cut the amount of heat transfer through glass by more than 30%. 

"Draught-proofing is one of the most cost effective and least intrusive ways of improving the comfort of occupants and reducing energy used for heating with little or no change to a building’s appearance." Historic England

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. 

Windows are a favourite entry point for burglars


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 period window security options available.  We also supply a wide range of casement window furniture, available in variety of finishes.