we specialise in the renovation, restoration and performance upgrading of sash windows

Scroll Down for more information




What makes us tick

From historic period buildings to old style tenement buildings, sash windows contribute greatly to the appearance of these beautiful old buildings but require a great deal of maintenance. At iSashWindows, we have the skills and expertise to restore any sash window to its former glory and bring a modern touch to provide greater performance and durability.


Our craftsmen have over 25 years of experience between them to ensure that your project will be handled by the most knowledgeable and experienced in their field. We work with you every step of the way, from the evaluation of your current sash windows, to the free quotation based on your requirements and budget.  Whether it’s a standard overhaul, draught proofing, noise reduction or a new sash window manufactured to match your existing windows, we have the perfect solution.

The urge for good design is the same as the
urge to go on living

What we do

Our Mission

As we offer a full repair replace and plastering service we will get your windows back to the original glory then agree with you a maintenance programe to ensure that you will only have to get the restoration done once then it is an ongoing project to ensure your windows always look and perform as they should.






Sash Window Restoration Process includes


Remove beading & carefully remove top and bottom sashes

Assess condition of sill, box frame and external pointing

Remove excess paint from frame and effect repairs as necessary

Replace sash cords and service pulleys

Re-balance sash weights to ensure smooth operation of both top and bottom sashes

Assess condition of top and bottom sash

Renovate top & bottom sashes, planing off excess paint and repairing putty damage where necessary

Install concealed draft proof system

Prime all exposed woodwork and caulk beading leaving the window ready to decorate

Fit new centre catch, up-lifters, sash eye and window locks as per clients instructions

Full operational demonstration

Single Glazing

double glazing

Many choose to update their sash windows to double glazing, but this is not always possible. With help from our consultants, you'll be able to determine whether your windows can be upgraded to double glazed or be exact copies of the original single glazed. Our single glazed units are of the highest quality and with the addition of draught proofing and our unbeatable joinery skills, we're sure that you'll be satisfied.

sash window painting

The key to long lasting sash windows is good maintenance and painting forms a very important part of that. Professionally painted windows not only protects the timber but will give years of trouble free service.


Preparation is everything when it comes to a long lasting paint job, that is why we remove the old paint back to bare timbers, which gives a better result on the finished job. We use professional painters to carry out every job to ensure that every sash window is protected against the weather and finished to perfection. Almost any colour can be achieved and no further painting will be required for up to 6 - 12 years.

Double glazing brings a multitude of benefits, including a sharp decrease in noise pollution with the correct glazing configuration , greater insulation and better security, and with iSash Windows, upgrading your sash windows to double glazing has never been so simple.


At iSashWindows, our consultants are with you every step of the way, from determining if double glazing is suitable for your windows to the best approach in carrying out the upgrade.


There are two ways to upgrade to double glazed sash windows: renovating your existing windows or replacing the entire units. Your consultant will guide you through the entire process and will work with you to determine the best course of action depending on your existing windows and your budget.

Casement Window Repair and Restoration


If you have a Casement Window in need of repair or restoration you have come to the right place. iSashWindows are experts in repairing casement windows.


There is no job too big or too small for our team, whether it is just one casement window or a whole building we can take care of it and restore your casement window to the highest quality.


Our Casement Window Restoration Services utilise a special repair system that allows the original character of the bay window to be maintained.


Combining the window care product technology with the Curative and Preventative Maintenance Repair Methods will serve to restore the original durability of Timber Windows.

Flaking paint and failed Mastic seals are classic signs of sash windows which have not been properly maintained and have fallen into disrepair. At iSash Windows, we look beyond the decay to bring out the beauty underneath.


We believe that traditional sash windows can make any building look stunning and our aim is to being these beautiful windows into the twenty-first century. Our team are highly skilled and can repair sash windows in almost any condition. We pride ourselves on being able to offer the most cost effective solution to retain the character and value of your home.


Good design is good business.



Contact Us


I02 Westcombe Hill








TeL: 020 3289 0413




Submitting Form...

The server encountered an error.

Form received.

Are your windows stuck or stiff to move

Do they rattle or let force 10 gales through

Are they tired and in need of a bit of TLC


Now's the time to contact

0203 289 0413


I will draught proof your windows and give them a service

This will make them slide smooth and easy which will stop your rattles and sticky or stiff opening/closing


Your benefit from this will be savings in your energy bills and a nice clean new look window


I will do 2 windows for the price of 1

That's £300 for 2 windows to be draught proofed and serviced


Like and Follow us on Facebook to receive a 10% discount on

Like what you see?

Keep up to date on all of our content by subscribing to our newsletter!

Submitting Form...

The server encountered an error.

Form received.