At North London Box Sash Windows, we take great pride in delivering a custom and personalised service to all our clients. Our team of experienced professionals work closely with you to comprehend your specific requirements and preferences.
We ensure that we fully understand your needs so that we can provide you with replacement box sash windows, casement windows and external doors that meet all your expectations.
We understand that every client has unique needs, and therefore, we offer a bespoke service to ensure that our windows fit seamlessly into your property's existing design. Our team ensures that your replacement windows and doors will not only look beautiful but also function efficiently. We use only high-quality materials to ensure that the windows last for a long time.
If you need a quick quote for replacement box sash windows, our team is always ready to help. We understand that replacing windows can be a significant investment, which is why we provide transparent pricing that reflects the quality of our work. Our quick quote service allows you to receive an estimate quickly, without any obligation to proceed. This way, you can make an informed decision about whether our service is right for you.
We specialise in box sash window, external doors and casement window installation. Click on the image below to find out more about each of our services.
With over 30 years experience in the manufacturing and installation of box sash windows, casement windows and external doors, we consistently deliver a great service for all of our customers.
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Fully Accredited Specialists
Full 7-Year Comprehensive Guarantee
Free Home Surveys & Quotation
Every Detail of Existing Windows Can Be Replicated
Our standard European Redwood windows have engineered Siberian Larch pine timbers throughout, with a hardwood Eucalyptus Grandis sill for ultimate durability. The glass units are internally beaded as all glazing products should be, with a beautiful timber putty replicating sight-line to the outside. At North London Box Sash we supply our windows with the latest glass technology with accompanying products that surpass the UK’s building requirements.
All windows are finished in our workshop with one of the world's leading timber paints, with two undercoats and two finishing coats, new windows will repel even the harshest of weathering at any temperature. With a modern addition of draught proofing, the Schlegel gaskets that are fitted to our windows will keep out gales whilst also insulating. All box sash windows are complimented with tasteful period ironmongery, finishing off with a touch of class.
When it comes to building sustainably, high-energy efficiency, durability, and indoor climate are key factors. To achieve this, thermally optimised edge bond solutions for insulating glass are what it takes. With our warm edge spacers between the glass panes, our technoform warm-edge spacer improves the thermal performance of the edge bond and thus guarantees gas tightness at a peak level.
One of the key features that set our external doors apart from the rest is their energy efficiency. All our doors combine timber with double-glazing, which means they contain two panes of glass separated by a layer of gas. This design helps to reduce heat loss and improve insulation, keeping your home warm during the colder months. Our doors also have a high thermal performance rating, which means they meet the latest energy efficiency standards.
In addition to being energy-efficient, our external doors are also designed with security in mind. We understand that protecting your home and family is a top priority, which is why all our doors come equipped with high-quality locks and hinges. We use only the best materials and hardware to ensure that our doors meet the highest standards of security.
We take pride in our sympathetic architectural design approach, which means we work closely with our clients to ensure that our doors fit seamlessly into the overall aesthetic of their property. We offer a range of finishes, colours, and styles to choose from, ensuring that you can find the perfect door to match your taste and preferences. Whether you're looking for a traditional or contemporary design, we have something to suit every style.
We specialise in designing and installing bespoke casement windows that match the style and character of your property. Whether you have an Edwardian terrace or a church conversion, our experienced team can create casement windows that complement the existing architecture and enhance the overall appearance of your home. We understand that every property is unique, which is why we offer a range of customisation options to ensure that your new casement windows are tailored to your specific requirements.
Our standard European Redwood casement windows have engineered timbers throughout, with a hardwood Meranti sill for ultimate durability. The casement sashes have a choice of either a multipoint locking system loaded on frictionless, easy clean hinges or a more traditional method of ball bearing butt hinges with a stay and fastener for secure locking. The glass units are internally beaded as all glazing products should be, with a beautiful timber putty replicating sight line to the outside.
At North London Box Sash, we supply our windows with the latest glass technology with accompanying products that surpass the UK’s standard building requirements. All windows are finished in our workshop with one of the worlds leading timber paints, with two undercoats and two finishing coats, new windows will repel even the harshest of weathering at any temperature. With a modern addition of draught proofing the Schlegel gaskets that are fitted to our windows keep out gales whilst also insulating.
Had three grotty drafty old windows replaced by NLBS and was completely delighted by the new, perfectly fitting double-glazed replacements. The difference in heat retention in the rooms is extraordinary. The quote was very competitive. Everyone arrived at the time they said they would arrive and finished by the time they said they would be finished...
The team were brilliant from start to finish. They were responsive, reliable and the end result is of a great quality. We had a sash window replaced and had such a good experience we asked them to then replace two further windows. Could not recommend highly enough.
