Sash Window Replacement

Sash Window Replacement
by Mortice & Green

At Mortice & Green, we provide specialist sash window replacement services for homeowners across London who require beautifully crafted timber windows that respect the character of their property. Established in 1994, our family-run business has over 30 years of experience manufacturing and installing bespoke sash windows for Victorian, Georgian and Edwardian homes, as well as listed buildings and properties within conservation areas. Every replacement window is individually handcrafted in our independent workshop using premium-quality hardwood, allowing us to recreate the original appearance while delivering outstanding durability, security and energy efficiency. From your initial survey through to installation, all work is carried out by our experienced in-house joiners, ensuring exceptional craftsmanship and a personal service throughout.

Bespoke Timber Sash Windows Made to Match Your Home

No two period properties are the same, which is why every sash window we manufacture is made to order rather than mass produced. Our skilled craftsmen carefully replicate the original proportions, mouldings, glazing bars and detailing to ensure your new windows blend seamlessly with the character of your home.

Where existing windows have deteriorated beyond economical repair due to extensive timber decay, structural movement or years of neglected maintenance, replacement is often the most practical long-term solution. Our bespoke timber sash windows retain the traditional elegance of the originals while benefiting from modern manufacturing techniques and premium hardwood construction designed to withstand the British climate.

Whether you require a single replacement window or a complete property installation, we take pride in producing windows that not only look authentic but also operate smoothly and reliably for decades to come.

Traditional Appearance with Modern Performance

Replacing ageing sash windows offers far more than an aesthetic improvement. Modern timber sash windows provide excellent thermal performance, improved security and greater day-to-day comfort, all while maintaining the architectural integrity of your property.

Our replacement sash windows can be manufactured with slimline double glazing where appropriate, improving insulation and helping reduce energy bills without compromising the traditional appearance of the frames. Precision manufacturing also eliminates common problems such as sticking sashes, rattling frames, draughts and poor alignment, resulting in windows that open effortlessly and close securely.

For listed buildings and conservation areas, we work closely with homeowners to produce replacement windows that meet local planning requirements wherever possible. Our extensive experience with heritage properties allows us to recommend the most appropriate solution while preserving the original style and character of the building.

Every replacement sash window is carefully installed by our own experienced team and backed by an industry-leading 25-year guarantee, giving you complete confidence in your investment.

Why Choose Mortice & Green?

Since 1994, Mortice & Green has earned a reputation as one of London’s trusted specialists in timber sash windows. Our philosophy has always been simple: preserve original windows whenever possible and only recommend replacement when it genuinely offers the best long-term outcome.

Every survey is carried out by one of the company proprietors, ensuring you receive honest, expert advice based on decades of practical experience. Unlike many national companies, we never subcontract our work. From manufacturing to installation, every stage is completed by our own highly skilled craftsmen, allowing us to maintain consistently high standards.

Because we manufacture our windows in our own independent workshop, we have complete control over quality, materials and finishing. This enables us to produce bespoke hardwood sash windows that faithfully replicate original designs while delivering outstanding longevity, performance and value for money.

Heritage Properties Across London

For more than three decades, we’ve helped homeowners preserve some of London’s most beautiful period properties. Our work can be seen on elegant Georgian townhouses, Victorian terraces, Edwardian family homes and architecturally significant listed buildings.

We regularly undertake sash window replacement projects throughout:

• Kensington
• Chelsea
• Fulham
• Wimbledon
• Hampstead
• Islington
• Hackney
• Notting Hill
• Mayfair
• Belgravia
• Putney

Our expertise also extends across Central, West, North West, North and South West London, where we’re frequently asked to replace original timber sash windows in conservation areas and heritage properties.

If your property is located elsewhere in Greater London, we’d still be delighted to hear from you. Our surveyors travel throughout the capital and can advise on the most suitable replacement solution for your home, regardless of location.

How Much Does Sash Window Replacement Cost?

Every sash window replacement project is unique, so the cost depends on several factors, including the size of the windows, the design, glazing specification and whether bespoke detailing is required to match the original joinery.

Your quotation will take into account:

• The number of windows being replaced.
• Window dimensions and opening configuration.
• Hardwood or specialist timber requirements.
• Double glazing or slimline glazing options.
• Heritage and conservation requirements.
• Decorative mouldings and bespoke joinery details.

We provide free, no-obligation surveys throughout London, allowing us to inspect your existing windows and offer honest recommendations. In many cases, we may advise refurbishment instead of replacement if the original windows can be successfully restored. However, where replacement is the most appropriate solution, our bespoke timber sash windows provide a long-lasting investment that enhances both the appearance and value of your property while preserving its period charm for generations to come.