Sash Windows in London
Handmade by 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.
Our unique service
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.
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.
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.
Very professional from the outset to the final licks of paint. Good quality windows and door that look brilliant.
A. Cummine - Clapham, SW11
You can rely on them to do a good job.
C. Buxton - Clapham, SW4
Thoughtful installers, on time, price as quoted and the windows are a huge improvement (quieter inside and no more cold air). Definitely would recommend.
S. Vincent - Kennington, SE17
I was immensley happy with the job - efficient, thorough, smartly carried out, and everything done with much skill and pride.
S. Alpin - Notting Hill, W11
Our windows are fantastic, exactly what we wanted. Everybody that we dealt with was excellent - professional, kind and helpful.
B. Roberts - Bow, E3
Great craftsmanship and very considerate and tidy at the end of each day.
M. Cunningham - Highbury, E5
Excellent service and workmanship. Everyone we have dealt with have been fantastic, especially the fitters who were friendly, passionate and extremely diligent.
S. Lauder - West Norwood, SE21