Preserving and accurately replicating London's stock of traditional windows & doors

Welcome to Kensington-Sash

Did you know that all of our replacement products are bespoke?

We are heritage window replacement and refurbishment experts working on period homes, listed buildings and those within conservation areas.

We carry out all elements of sash window restoration and timber product replacement works with minimal disruption and expert dust control.

Joinery & restoration experts

Kensington Sash Group create bespoke double glazing timber products of the highest quality, finished with meticulous on-site installation by our skilled works team. We have also developed a comprehensive restoration service which is designed to preserve the life of original timber windows and doors.

  • Timber products "like for like".

  • Double glazed traditional windows.

  • Banham entrance doors

  • Professional restoration using our non invasive, unique draught proofing system.

  • Painting & decorating

We also supply the very latest sleek architectural designs, including Reynaers aluminium windows and doors.

Professional services

Experts in ensuring projects run seamlessly from start to finish. Kensington Sash Group offer a range of technical services and support to all clients. Full production drawings, CAD section drawings, thermal calculations on all products manufactured and in house liaison with local planning authorities to gain planning permission if needed. We also offer professional surveying, 3D modelling, planning advice and building regulation compliance assistance. Find out more by navigating to consultancy.

Our values


Kensington Sash are driven to provide a turnkey service that embraces challenges and meets clients' needs. Seamlessly delivering each project with expert planning to exceed expectation.




Communication is key. The company reflect this by always ensuring the client is updated throughout a project, endeavouring to establish long lasting ongoing working relationships with clients.

Always building trust with our clients and partners. We take pride in our operational stance of being honest, transparent and committed to doing what is best for our clients and company.

Aftercare & warranty

We have a great track record of not needing to return back to jobs for snagging. It is easier to complete a job correctly the first time than keeping having to come back. This being said, timber is a natural product and our products have many moving parts. Sometimes minor adjustments can be required on hinges/locks after our products have settled into their frames. We store details of each project on file, enabling us to source replacement parts quickly and without hassle. Combined with an aftercare team to assist and remedy any snagging issues that may occur on occasion.

We guarantee the timber, glazing units and ironmongery in our windows for 10 years and give 3 years on paint finish.   

Environmental policies

The management of Kensington Sash Group believe that the use of Timber in the building industry (instead of non-renewable materials like UPVC) can significantly contribute to sustainable construction. If all companies in the industry played their part to reduce carbon emissions, the benefits would be immense in the future.


90% of all products that we install are manufactured using timber. In addition to this Kensington Sash Group use only FSC® 100% wood sourced from FSC® certified forests, when manufacturing our double glazed sash windows and replacement joinery products. By buying timber windows and doors from our company, you are helping to promote growth of the forest in Europe and are protecting our planet from deforestation and climate change.

Health & safety

The Health and Safety Executive (HSE) have brought small domestic works into the same category as commercial and large building projects meaning that as of April 2015, contractors and the client are required to comply with these rules and regulations.

When operating on-site, our employees, other sub contractors and clients safety is paramount. Kensington Sash Group's Health and Safety Policy is formally reviewed annually by safety advisors and it is our aim to achieve a working environment free of work-related accidents, incidents and ill health.

Kensington Sash have provided the following courses in respect to further developing our installation team's good practice:

  • Working at heights

  • Harness training

  • CSCS- construction skills certification scheme

  • Manuel handling

  • UKATA asbestos awareness

  • Emergency first aid at work

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