New Sashes Into Existing Box Frames

If your window frames are in good condition we can replace the sashes (moving parts) only, allowing for double glazing without completely replacing the window frame, this will minimize disruption as well as keeping the heritage look of your window.

Our employed surveyors with many years of experience will replicate all detailing such as ornate, glazing bars and mouldings to ensure your new windows are fully in keeping with your property.

Your new sashes will be expertly handcrafted by our employed craftsman to match your original windows, with a choice of sustainably sourced timber using either high-quality treated Nordic Pine, Hardwood Sapele or Accoya timber.

The majority of our new timber sash windows are handcrafted using Accoya wood, a sustainably sourced modified wood that comes with a 50 year anti-rot guarantee.

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New Sashes Window Into Existing Box Frames

We believe our new double-glazed sashes fitted into existing box frame service is the most comprehensive within the market. Your new sashes will be supplied fully painted, applied with 4 coats of micro-porous paint.

Double glazing brings many benefits, including improved draught proofing, better heat retention, noise reduction, improved security giving the look of a new window without the cost. At the same time this service allows you to retain the heritage look whilst keeping your original box frame and architraves.

Sashes are handcrafted to match the original design as closely as possible and SJB have many glazing options including safety/security glass, acoustic glass, stained glass, or obscure patterned glass.

The existing sashes, weights & beads are carefully removed and disposed of.
Original box frame pulley styles are stripped back to its original timber, sanded, repaired & filled as necessary to prepare for painting.

Let’s Chat About Your Requirements

Get in touch today with one of our friendly team members for free expert advice & guidance on your requirements.

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Window Styles & Colours

Styles Of Sash Window

There are many styles of sash windows, we are able to create the variant that suits your property.

Best Sash Window Styles & Types
Single Colour Options
Dual Colour Options

We can also paint your new wooden sash windows and door two-tone,
one colour outside, and a different colour inside.

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Install Bespoke Sash For Your London Home

We use microporous paints with a RAL colour of your choice to apply 2 x undercoat and 2 x topcoats to the existing box frame inside and out, ready to hang your bespoke new sprayed finished sashes.

Your handcrafted sashes are installed into the existing box frame with our weather pile draught proofing system and new weights are supplied to counterbalance the much heavier double-glazed sashes.

Once your bespoke sashes are installed our craftsman will apply a final topcoat to the complete box frame giving your window a beautiful crisp finish.

Lastly, a full set of elegant window fittings: sash lifts, pulls, fitch fastener with key operated restrictor locks, which makes your home more safe and secure will be applied to give you the fully finished product.

When installing new single/double glazed sashes into existing box frames you will not receive a FENSA certificate as the existing box frames are refurbished instead of being replaced. This is classed as being a “repair” so, this means that a FENSA certificate is not required for this work.

Projects we have completed

We’ve mastered our craft over many years of manufacturing & installing a wide range of
Sash, Casement, and Doors into a wide variety of homes.

Windows Installed
Doors Installed
Homes Served
Years Of Experience

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Timber Sash Windows For Sale

What Are Average Timber Sash Windows Prices?

Ultimately, the price of a timber sash window installation is going to vary from application to application. That’s because there are several variables which go into a project. You may not choose from standard sizes, for example, which may mean extra work and support needed in fabrication and fitting. However, that doesn’t mean you won’t be able to access a high-value tariff.

We don’t publish all our tariffs and rates online simply because bespoke project pricing can vary. We want to make sure that our customers have access to a flexible, bespoke pricing system that they can depend on when it comes to setting up their project. When you first approach SJB Sash about new timber sash windows in London, we will offer you a quote that’s easy to understand and which is broken down.

What’s more, we want to make sure that you are only ever charged for the services you use, and those you benefit from. We see little point in adding on fees or labour costs along the way. Therefore, applying for a free quote from SJB will grant you a reliable, fixed-rate which you can depend on throughout the project. If you are concerned about timber sash window cost, don’t be. We work with competitive rates and pricing to ensure you get fantastic value, regardless of what you need.

Bespoke Timber Sash Windows London

Practicality And Precision

Choosing SJB to for installation will benefit your budget as well as your project timelines.  As leading experts in the design and installation of bespoke timber sash windows, you can rely on us to deliver an end product which is perfectly in-line with your wishes.  What’s more, we will always deliver project support and labour within timescales that are convenient for you. We aim to provide an efficient, precise service. Just because we work efficiently, doesn’t mean the work we do is hurried or rushed.  Far from it. We want to make sure the windows you buy from us will weather years to come.

Timber sash installations offer incredible practicality and convenience. Sash window systems are already straightforward to operate and maintain. Timber systems are amongst the most resilient on the market, which means you will be purchasing windows which are easy to use and which will stand the test of time.  Bespoke timber sash windows, too, can be tailored and fitted to your exact desires. There will be no more worry over whether or not a window solution will suit your property – as we’ll make sure of it before we even start installing.

A sash horn is one of the key features that make a traditional timber sash horn instantly recognisable. Originally sash horns were an integral part of a timber sash. They were designed to strengthen the mortice and tenon joints of the window and prevent the sashes being opened too far.

You will see a few of our frequently used horn designs below.

Please note we can manufacture to any design horn you currently have.

The newly manufactured sash windows are treated with timber preservation which protects from wet and dry rot. After this the windows receive primer and three coats of a micro porous acrylic paint. All windows are then hung and dried in our dedicated drying room.

Here at SJB Sash Windows we are adept at successfully matching colours with the existing coatings on the property, including stains and varnishes.

SJB new sash windows are crafted using sustainably sourced timber and we match all mouldings and profiles to blend in with your existing sashes and decor seamlessly.

We know that your primary interest is likely to be looking for the most energy efficient double-glazed sash windows for your home. Yes, it’s common knowledge that double-glazed sash windows make a reduction of heat loss, but not many know that the figure is as high as almost a third of all domestic heat escapes through windows. The double-glazed sash windows we install are guaranteed highly energy efficient and will improve your energy efficiency and reduce energy bills. Should you have special requirements there are also upgrade options to further increase the efficiency of your windows.

In addition to improving your energy efficiency and reduced energy bills investing in new double-glazed sash windows will also provide you with reduced noise pollution. Sometimes it’s nice to close your windows and shut the outside world out! Specialised acoustic glass can reduce external noise pollution leaking into your home by up to 60%.

Technically speaking acoustic glass has an additional lamination which features an interlayer not seen in standard double-glazed windows. It’s this extra layer that can shut out extra noise such as road traffic, overhead planes and railway lines. Importantly this extra layer does not negatively effect the light flow into your room, and so you can enjoy reduced noise without effecting the look of your windows.

Specialist Timber Window Company

No matter where you may have compared timber sash window cost elsewhere, it’s crucial you find a leading local specialist to help you through the whole process. After all, windows are something you should be able to rely on for years to come. Why settle for anything less than the best care and guidance?

We always advise you to be careful if you have been looking at ‘cheap’ windows elsewhere. With some firms and services, a cheap service can mean that quality in care and product delivery are compromised for price. At SJB, we offer a balance. We support affordable, cost-effective solutions which are competitively priced. We never compromise the quality of our products or service for the sake of lowering cost. Instead, we dedicate ourselves to providing genuine value in everything we do.

If you’d like to know more about setting up timber sash windows for your home, call or email us today.