Over 200 bespoke timber sash windows were replaced to preserve Georgian features and meet luxury hotel standards.


High-performance wooden sash windows crafted for energy efficiency, acoustic insulation, and heritage authenticity at The Biltmore Mayfair.
Featured Ranges in Our Mayfair Installation
Each window was crafted from sustainably sourced timber, combining traditional joinery techniques with advanced materials. They also incorporated specialised soundproofing technology to minimise external noise, ensuring a quiet and comfortable environment for hotel guests in the bustling heart of Mayfair.
Each window was crafted from sustainably sourced timber, combining traditional joinery techniques with advanced materials. They also incorporated specialised soundproofing technology to minimise external noise, ensuring a quiet and comfortable environment for hotel guests in the bustling heart of Mayfair.
For hotels or properties in need of sash window replacements, these bespoke solutions demonstrate how timber sash windows can balance heritage aesthetics with the requirements of modern living.

Timber Sash Windows for Luxury Mayfair Hotels
In 2019, we played a key role in the transformation of The Millennium Hotel into The Biltmore Mayfair, a five-star destination on Grosvenor Square. As part of this landmark hotel renovation, over 200 timber sash windows were meticulously replaced to preserve the buildingās Georgian charm while meeting modern performance standards.
This extensive refurbishment positioned the hotel as part of Hiltonās prestigious LXR Hotels & Resorts collection, as a pinnacle of timelessness and contemporary luxury.
Project Details & Challenges
The Biltmore Mayfair occupies a position of historical and architectural significance in London. A key focus for us in 2019 was the replacement of the property’s timber sash windows, integral to the buildingās facade and its connection to Mayfairās heritage. These bespoke wooden sash windows had to retain their period aesthetic while delivering modern benefits for guests and staff inside.
Ensuring historical accuracy in craftsmanship required precise attention to detail, from the proportions of the window bars to the finish of the timber. Simultaneously, the projectās scale and high-profile setting added complexity. Replacing over 200 windows in a working hotel environment demanded careful coordination to minimise disruption. Each installation had to be executed efficiently while maintaining the safety and comfort of guests and staff.
About the Millennium Mayfair Hotel Refurbishment
The Biltmore Mayfair underwent an ambitious Ā£60 million renovation, transforming the former Millennium Hotel on Grosvenor Square into a luxury five-star destination. The project involved extensive updates to the property, including redesigned interiors, new dining options, and upgraded amenities, rebranding it under Hiltonās LXR Hotels & Resorts.
The refurbishment celebrated the buildingās Georgian heritage while bringing it into the modern era of hospitality ā and we are proud to have been a part of this refurbishment, providing our expertise in sash window replacements for high-profile heritage projects.
Why Mayfair Chooses Sash Windows London
We have built a reputation for delivering exceptional bespoke window installations and sash window replacements across Mayfair and the rest of London. With extensive experience in both period properties and modern designs, we specialise in crafting high-quality windows and doors that meet the needs of each project.
Every product, from timber sash windows to entrance doors, is manufactured to exacting standards, ensuring durability, energy efficiency, and a perfect fit for your property. As a FENSA-certified company, Sash Windows London guarantees compliance with the latest building regulations, providing peace of mind with every installation.
Bespoke Timber Sash Windows for Luxury Establishments

For high-end hotels and property owners in Mayfair seeking bespoke timber sash windows, Sash Windows London offers the expert craftsmanship you require. Whether itās a full-scale refurbishment or a single replacement, our team ensures every aspect of your home or business is preserved and uplifted. Contact us today to discuss your project.