Onyx is a London based studio specialising in construction, fit-outs, architectural and interior design for a spectrum of high-end residential and commercial clients.

​Our collective experience encompasses all aspects of the design process, with an extensive portfolio of prestigious projects around the world, including substantial single residences in Kensington, multiple apartments within One Hyde Park, Knightsbridge and international homes.

Onyx offers a multi-disciplinary service, from initial concept, planning permissions, full construction packages, project management along with interior design packages for both residential and commercial clients.

Expertise

Construction,

Project Management,

Planning,

Architectural &

Interior Design

GASHOLDERS LATERAL APARTEMENT
KING’S CROSS, LONDON N1C · FIT OUT · 1,500 SQFT

Accreditations

THE STUDIO

Onyx was founded by Richard Sadler and Elizabeth Cook, a unique partnership in the industry. Richard’s 30 years in construction perfectly complements Elizabeth’s distinctive design style gained from her earlier career at Candy & Candy.

Richard Sadler has had a structured approach to design, construction and the management of luxury developments across prime London for close to 20 years. ​Over this time, Richard has designed and built projects for high profile clients who continue to commission Richard’s expertise for their current residential projects.

Elizabeth Cook trained as an architect for seven years, before joining Candy & Candy as a designer working on highly prestigious projects around the world, including multiple apartments within One Hyde Park, Knightsbridge.

Elizabeth has continued to collaborate with prominent designers within the capital, successfully completing projects within the residential and development market.

Richard’s and Elizabeth’s extensive network, wealth of knowledge and meticulous planning ensure projects are delivered with flair and creativity and a meticulous attention to detail from the architectural designs to the finer accessories.

A dynamic team, utilising their wealth of experience to create truly unique properties for Onyx’s clientele.

KENSINGTON RESIDENCES
KENSINGTON, LONDON W8 • FIT OUT
KENSINGTON RESIDENCES
KENSINGTON, LONDON W8 • FIT OUT

Finishes

Onyx has the ability to draw upon our experienced in-house teams, as well as collaborating with our vast network of skilled craftsman and trades, to deliver truly unique and bespoke finishes for our clients.

01Bespoke Joinery

Onyx provides a full design, construction and installation service of Bespoke Joinery from Wine Cellars, to Dressing Rooms and Media Units.

02Specialist Floor & Wall Finishes

Our specialist team of craftsman are skilled in the application of specialist finishes, including Polished Plaster, Decorative Silk Wallpaper and Herringbone Timber Floors with detailed inlays.

03Lighting & Audio-Visual Installation 

Onyx provides a full design and installation of Lighting & Audio-Visual Systems, tailored for each individual client’s specifications.

04Swimming Pool & Spa Construction

Onyx has a wealth of experience in the design, installation and commissioning of Swimming Pools, Steam and Sauna Rooms, from Ground to Basement Levels.