Seymour Mews House Office Refurbishment London | CAT A & CAT B Office Upgrade

Value:

£10.5m

Timescale:

50 weeks

36,000 sq ft over 4 floors of prime West London office space with open terrace.

Spacious reception area with polished floors, modern staircase, and natural light from large windows—demonstrating high-quality commercial fit out and professional interior refurbishment.

This office refurbishment London project involved the extensive transformation and extension of a 36,000 sq ft commercial office building in West London. The scheme combined both CAT A and CAT B works to create high-quality office accommodation across multiple floors, delivering modern, flexible workspace designed to meet institutional standards and occupier requirements.

Working within a busy urban location presented several challenges. However, careful planning enabled the team to manage noise levels, traffic restrictions and planning constraints while maintaining progress throughout the programme.

Office Refurbishment London with Building Extension

A major element of the project involved the demolition of the existing fifth floor and the construction of a larger rooftop extension. This increased the building’s footprint and maximised the available office space.

In addition, we removed the existing façade spandrel panels and windows across six floors. We then installed a new Schueco curtain walling and window system, significantly improving the building’s appearance, energy performance and natural daylight levels.

As a result, the refurbishment delivered a contemporary external aesthetic while enhancing the overall quality of the workplace environment.

CAT A Refurbishment London and Building Infrastructure Upgrades

The project included substantial structural and infrastructure improvements throughout the building. We demolished the existing lift shaft and reconstructed it from the ground up to accommodate a new two-car lift installation.

Furthermore, we carried out extensive carbon fibre strengthening works to the existing floor slabs to support the upgraded structure. We also installed new base-build mechanical, electrical and building services throughout the property.

To complement these improvements, we fitted raised access floors and created bright, open-plan CAT A office space that offers flexibility for future occupiers.

CAT B Fit-Out with Bespoke Workplace Features

Alongside the CAT A refurbishment, Virtus delivered CAT B fit-out works designed to a high specification. The workspace incorporated a range of bespoke joinery elements that enhanced both functionality and visual appeal.

Moreover, we installed a striking architectural metal staircase that creates a strong visual feature while improving connectivity between floors. The design also included a new external courtyard and a first-floor decked terrace, providing valuable breakout space for occupiers.

Consequently, the CAT B areas offer a modern and engaging workplace environment that supports collaboration, wellbeing and productivity.

Delivering a Successful Office Refurbishment London Project

This office refurbishment London project successfully combined extension works, CAT A refurbishment and bespoke CAT B fit-out within a complex urban environment. Through careful coordination and technical expertise, Virtus transformed an existing commercial building into a high-quality workplace that meets the expectations of both institutional investors and modern office occupiers.

The completed development delivers enhanced building performance, improved occupier amenities and flexible workspace designed for long-term use.

Project Gallery

Modern office lobby with polished concrete flooring, recessed lighting, reception desk, elevator access, and glass doors leading to a staircase—showcasing high-end commercial fit out and professional entrance refurbishment.

Spacious office reception area with minimalist seating, natural light from large windows, and sleek black ceiling lighting—demonstrating premium commercial fit out and modern workplace refurbishment.

Modern office reception area with sleek desk, comfortable seating, natural light, and decorative elements—highlighting professional commercial fit out and welcoming workspace refurbishment.

Minimalist office interior with beige sofa, wooden chairs, glass-walled meeting rooms, and light wood flooring—illustrating premium workspace fit out and modern commercial refurbishment.

Minimalist interior with green sofa, nested coffee tables, wall-mounted TV, and geometric wall paneling—showcasing bespoke office or lounge fit out and contemporary refurbishment design.

An outdoor courtyard of a modern building featuring a mix of black and glass facades. The space includes a wooden deck with various seating arrangements, including metal chairs and colorful benches. Potted greenery adds a touch of nature, while the large windows of the surrounding buildings provide a bright and inviting atmosphere. This area serves as a vibrant communal space for relaxation and social interaction, enhancing the overall appeal of the architecture.

Open-plan office interior with ergonomic workstations, stylish breakout seating, and natural light—illustrating expert commercial fit out and modern workspace refurbishment.

Open-plan office interior with collaborative seating, exposed ceiling ductwork, natural light, and modern workstations—demonstrating creative workspace fit out and contemporary office refurbishment.

Contemporary conference room with white chairs, large windows, wall-mounted screen, and geometric wall décor—illustrating premium office fit out and modern meeting space refurbishment.

Modern meeting room with sleek white table, light blue chairs, integrated tablet controls, and natural light from large windows—exemplifying high-spec office fit out and professional meeting space refurbishment.

A spacious and bright interior of a CAT A office space featuring large floor-to-ceiling windows that provide ample natural light. The minimalist design includes a smooth, polished concrete floor and a clean white ceiling with integrated lighting. The open layout enhances the feeling of airiness, making it an ideal environment for various uses, from creative workspaces to modern offices. The view outside showcases an urban landscape, adding to the ambiance of the space.

Awards and Accreditations

We are committed to being recognised as a modern forward thinking construction company and realise the importance of meeting the standards and expectations of our customers and in recognition of this we are members of Constructionline and CHAS, whilst also having accreditation under ISO9001 & ISO1400.