Windows are often referred to as the eyes of a house, we can install complete replacement box sash windows or timber double glazed sashes into existing box frames. We also carry out replacement casement windows, external timber doors and shutters.

Replacement windows exceed the latest building requirements and we issue a 10 year insurance backed guarantee and FENSA certificate for your peace of mind.

By combining traditional joinery methods with modern double glazed units and draught stripping it has become possible to keep every bit of the elegance, style and beauty of the original windows but with the modern benefits of heat retention, noise reduction and security.

Scroll down to read about the many different reasons for replacing or repairing your windows.

Selling an existing property

We are increasingly carrying out the installation of new windows and doors to assist the sale of an existing property and help the homeowner achieve a faster sale at the right price. Rotten or poor quality windows being flagged up on a survey will cause worry and no doubt negotiation from a potential buyer. Kerb side appeal will be hugely improved by quality timber windows and potential buyers will be impressed by how well the windows work and insulate from noise and cold.

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Moving into a new home

An ideal time to upgrade the windows to double glazed or over haul the existing windows before decoration of walls and new floor coverings.

Maintaining windows

Maintaining and repairing existing timber windows and doors is an important part of owning a home and can prevent the necessity of window replacement. Along with the roof and external walls of a property the windows play an important part of keeping you and your family warm, secure and comfortable throughout the seasons.

Reducing energy bills

With modern double glazed units the glass used is specially coated and the cavity filled with Argon, Krypton or Xenon gas. These units combined with effective draught stripping make the windows up to 4 x more energy efficient saving money and wasted resources. The indoor temperature will remain more constant as heat loss is reduced saving money on utility bills.

Overhaul and draught proof

Over hauling and draught proofing of existing windows offers great value for money. In the winter the windows will be draught sealed keeping your home warmer and in the summer the windows will be easily operational allowing for ventilation. Windows will not rattle and we install new fittings including key operated restrictor locks.

Noise reduction

As London’s roads and air space have become busier the requirement for noise reduction has increased, double glazed timber windows will make a huge improvement over original single glazed windows and are often enough to solve the noise issue but for more extreme cases we can offer acoustic noise reduction glass. Acoustic glass is a laminated glass designed to muffle noise and as an added bonus acts as a very effective security glass. Acoustic glass is often used as the outer pane of a double glazed unit or in single glazed form.


Condensation can be a real problem in many homes, double glazing greatly reduces condensation and we can install discreet trickle vents to the head of replacement windows if required. Draught stripping existing single glazed windows can make existing condensation issues worse due to the fact we are taking away the natural ventilation the gaps etc provide. We can expertly advise you on this.


As well as a range of security locks we can fit laminated security glass which would give any intruder a hard time entering through the windows or doors. For French doors we offer high security multi point locking as well as traditional 5 lever sash locks and bolts and for front doors we fit yale insurance approved products or Banham high security products. On our sash windows we fit key operated restrictor bolts which allow for ventilation whilst keeping the windows secure.

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  • Really friendly, reliable and efficient service. We had our windows replaced in several blocks and the same guy came each time, he was so tidy and the windows have transformed our house!

    ACTON, W3

  • Andy and his team did exactly what they said they would, when they said they would. They were a joy to have around and the result is even better than I hoped. Rear windows next!


  • Very happy with the service. We recommend A Sash Window Wizard to everyone needing help with their windows. Very good value for money.


  • Efficient service. It does make a difference-the house definitely holds heat better now. Professional and no fuss.

    EPSOM, KT19

  • Windows are fabulous-only wish I’d had them done ages ago!


  • We are really happy with our windows. The work was carried out with little disruption or fuss.

    EPSOM, KT17

  • Friendly, courteous, professional but above all came at the agreed time and carried out work meticulously to plan.


  • We are extremely pleased with the finished product.


  • Very professional job. So wonderful to find a company that delivers on its promises on time!


  • Extremely pleased with all aspects of the work.


  • All I can say is thank you very much Andy and staff. I have already recommended you to a friend.


  • Good value, well built product. Exemplary.


  • Reliable, friendly, professional. I have no hesitation in recommending ‘A Sash Window Wizard’ to other potential customers.