Sash Windows in South East England Since 1979

For nearly 40 years we've been handcrafting & fitting our superior sash windows and timber doors throughout London & the South East.


Timber Sash Windows & Doors

Expertly handcrafted timber windows and solid hardwood doors that offer exceptional performance, lasting value, and a stunning, classic finish.


Bespoke Design, Exceptional Service

With more than 30 years' experience to our name, we can help you enhance the comfort of your home and the efficiency of your existing windows.


Book a Free Design Visit

Why not arrange for one of our expert surveyors to visit you at home? You'll receive in-depth advice and a detailed written quote, fixed for 28 days.

Authentic Retro Timber Windows & Doors With All Modern Benefits

We were founded in 1979 to ensure you receive innovative craftsmanship without sacrificing tradition & trust. We are a local family firm built on trust and decency and we love taking you back to a bygone era where innovation and tradition held sway and the smell and feel of wood always meant quality craftsmanship.

Our mission is to honor that tradition whilst embracing innovation; to bring glorious good times back to your home and to help you and your family frame your day in the perfect way.

sashSash Windows

Our sash windows combine traditional design with exceptional performance. With over 30 years’ experience serving the London area, we use innovative processes, superior craftsmanship, and sustainable, high quality materials to create bespoke windows you’ll love forever.

casementCasement Windows

Casement windows combine the beauty and longevity of traditional hardwood windows with the simplicity of a hinged design. Our bespoke timber casement windows are handmade in London to your specifications, enabling you to tailor them to fit your home perfectly.

french doorsFrench Doors

Combining superior quality timber, reinforced double glazing and sturdy locking systems, our handcrafted French doors offer exceptional performance, security and insulation, and allow you to maintain the style, integrity and traditional beauty of your home.

Exterior DoorsExterior Doors

Our traditional timber doors are a wonderful finishing touch to any home. Available in a range of designs and colours, our sturdy and attractive doors are double glazed with safety glass, and feature double key locks and shoot bolts for your complete peace of mind.

Do you qualify for a Free Design consultation?

Our team of experts are standing by to help you create the perfect bespoke window solution for your home. Our Free Design service is very popular so click here now to find out if you qualify. If you do qualify we will arrange a convenient time. Our friendly, expert designer / certified surveyor will provide you with a detailed written proposal and quote.

Click here to apply now!

traditionTradition Meets Performance

Our traditional timber sash windows and doors have delighted customers for over 30 years. Combining elegance with exceptional standards of performance, insulation, security and finish, our products are of the very highest quality.

whichWhich? Trusted Trader

Box Sash is endorsed by Which?, the UK’s largest independent consumer organisation. We pride ourselves on delivering outstanding service, as you can see from our positive customer feedback, CLICK HERE. If you search independently for us on Which?, without using the direct CLICK HERE link, in order to find us you need instead to enter ENVOYGATE (INSTALLATIONS) LTD, which is our registered parent company.

estMarket Leader Since 1979

We’re London’s original box sash window company, operating in London and the South East since 1979. Our innovative approach to windows and doors, combined with our outstanding service, has kept our customers happy for over 30 years.

serviceService Tailored To You

We know that every project is different, which is why our services are tailored to your unique requirements from start to finish. Our experts will turn your bespoke design into stunning reality.

our-lifetimeOur Lifetime Guarantee

For complete peace of mind, our superior quality timber windows come with a lifetime parts guarantee, PLUS A FREE FIVE YEAR NO QUIBBLE GUARANTEE ON BOTH PRODUCTS AND INSTALLATION, all insured by the Independent Warranty Association.

beautifulBeautiful Bespoke Design

At Box Sash, there is no ‘One Size Fits All’ approach. Our experts listen to you and work hard to create a bespoke window solution that will blend seamlessly with your home’s original style.

Request a Quotation

At Box Sash, we know that choosing traditional timber windows and doors for your property is an investment that pays multiple dividends.

Our aim is always to be as trustworthy, clear and transparent as possible – we can advise you on a solution that’s tailored to your property, your personal design requirements and of course your budget so you can make the decision that’s right for you.

Click here to request a quotation now!

estimator tool