Sash Windows in London
Sash window specialists since 2007
About Core Sash Windows
Expertly installed windows & doors in London
We are London based specialists in sash windows, casement windows and doors with over 18 years of experience. As experienced installers of timber sash windows and aluminium casements or doors, our focus is on customer experience and the quality of our installations. With thousands of our products in homes all over London, from Victorian terraces to listed buildings, we have the know-how to enhance any property. Our team are experts in fitting sash windows, casement windows, and doors in London, ensuring exceptional results every time.
Our accreditations
We’re proud to be featured in House & Garden’s prestigious “The List” and are approved by FENSA, ensuring full compliance with building regulations. We’re also a Which? Trusted Trader and a GGFi member, offering insurance-backed guarantees for added peace of mind.
Traditional craftsmanship
Our Products
From classic timber sash windows to contemporary casement designs and elegant doors, we craft and install bespoke windows and doors for London homes — built to last, finished beautifully.
Across London
Sash windows by borough
London is a city of sash windows. From the Georgian terraces of Bloomsbury to the Victorian streets that run for miles across Hackney and Haringey, the sliding sash is part of how London looks. We've installed thousands across the capital, and the work shifts with the neighbourhood, property or conservation rules. Below are the boroughs where our work is most concentrated, but we're on the road across all 32.
Featured boroughs
Hackney
Hackney is where we do more sash work than anywhere else in London. The Victorian terraces of Stoke Newington, Dalston, Hackney Central, Clapton and London Fields are the backbone of our calendar. Many of the houses we work on still carry their original boxes, and the choice between a full-box replacement and a careful sash-only replacement is one we talk through with every owner.
Haringey
Crouch End, Muswell Hill, Highgate and Tottenham each have their own period character; Edwardian villas, late-Victorian terraces, the steep streets climbing toward Alexandra Palace. We're particularly busy in the conservation areas around Crouch End and Muswell Hill.
Islington
Islington's Georgian and early-Victorian housing, the Canonbury squares, the Barnsbury terraces, the streets around Highbury Fields, all set a different bar. It's exacting work and we like it.
Westminster
From Pimlico's Cubitt terraces through Marylebone's Georgian streets up to the mansion blocks of St John's Wood and Maida Vale, much of our Westminster work is on listed buildings. The joinery has to disappear into the original; period detail, period section, modern performance.
Camden
Camden runs from Bloomsbury north through Kentish Town and Belsize Park to the villas of Hampstead and Primrose Hill. Hampstead in particular holds some of the finest surviving Georgian and early-Victorian sashes in London, and we treat them accordingly.
Tower Hamlets
Two worlds in one borough. The Spitalfields silk-weavers' houses around Fournier Street and Princelet Street are some of the oldest domestic sash windows still in daily use in London. The Victorian terraces of Bow, Mile End and Stepney make up the bulk of our day-to-day.
Kensington and Chelsea
Some of the most exacting conservation work in London sits here. The white stucco terraces of South Kensington, the painted brick of Notting Hill and the garden squares of Chelsea are almost all listed or in conservation areas, so the borough holds sash detailing to a fine standard. Slim glazing bars, traditional putty lines and timber matched to the original are the norm rather than the exception on the houses we work on around Holland Park, Ladbroke Grove and the King's Road.
Other boroughs
The featured boroughs are where the volume sits, and where we've got the most photography, but that doesn't mean we haven't installed thousands of sash windows South of the river. A job in Bromley gets the same survey, the same conversation and the same service as a job in Hackney.
- Lambeth
- Southwark
- Wandsworth
- Lewisham
- Greenwich
- Brixton
- Camberwell
- Peckham
- Clapham
- Battersea
- Blackheath
- Hammersmith and Fulham
- Richmond upon Thames
- Waltham Forest
- Barnet
- Enfield
- Newham
- Redbridge
- Bromley
- Croydon
- Sutton
- Kingston
- Merton
- Bexley
- Brent
- Ealing
- Harrow
- Hillingdon
- Hounslow
- Havering
- Barking and Dagenham
Quality from end to end
Our services
Getting your windows or doors replaced or repaired is a big decision, and if you’re not familiar with the process already it can be difficult to understand exactly what you’re getting. Here’s a rundown of each of our services to help clarify the process for you.
Sash Window Replacement
Timber box sash windows, bespoke and matched to your home.
Learn more →Casement Window Replacement
Traditional flush timber or aluminium casement windows. Built to last and fitted with care.
Learn more →Door Replacement
Front doors, back doors, french doors and bifolding doors in timber or aluminium and installed by our own team.
Learn more →Our unique service
The comprehensive fit
We take pride in delivering a service that is completely unique to our company. From beginning to end, our experienced workmen oversee the entire installation seamlessly. You won’t need to hire any other trades to complete our work.
Scroll to follow the process
Making good
We repair what the work disturbs
Installing windows & doors is a big job that affects the surrounding plasterwork. That’s why we repair and paint everything with our comprehensive fit.
Traditional pointing
A timeless sand & cement joint
We are one of the only companies in London that carry out traditional sand & cement pointing, giving your windows a timeless appeal.
Brush stroke finish
Hand-painted, not just sprayed
Products will arrive with a sprayed factory finish. With our fully comprehensive service we also hand paint the windows to leave a more authentic brush stroke finish.
Complete service
From first survey to final finish
From your first survey to full completion, we take care of all aspects of your installation.
Finished with care
One team, from first survey to final finish
No other trades are required to support our work. With us you just get a single team who take responsibility for every detail until the job is genuinely done.
Added assurance
Our Other Benefits
We understand the importance of a reliable supplier in your construction or renovation project. With us, you have a dedicated partner who ensure that the key elements described below are consistently delivered to all our clients, regardless of the size of your job.
A customer focused experience
Good service depends on strong foundations, and we’re constantly focused on making them better for our customers.
High Quality Products
We source the highest quality, sustainable materials. We use FSC certified European Redwood and engineered Oak sills for most of our projects.
Skilled Workforce
Our friendly team of carpenters have many years of experience fitting timber sash windows & doors and are trained to work neatly & conscientiously.
Competitive Pricing
We consistently maintain competitive prices while delivering high quality products and an excellent service.
Your Design
Whether you'd like to replicate your existing designs or update them with your own concepts, our team can produce a product that fits your needs.
Craftsmanship on show
See Our Work
We've filmed a range of past installations including sash windows, casement windows, French doors, front doors, and aluminium windows and doors so you can see the finished results in real homes. From modern new builds to classic Victorian terraces, these videos showcase how our work looks across a variety of property types.
Trusted throughout London
What Our Customers Say
Read what our customers have to say about their experience with us.
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