Mayfair · Central London W1

Townhouse Extension
Architects Mayfair

Rosace has direct experience designing and extending townhouses in Mayfair and across Central London — navigating the City of Westminster's demanding planning environment with a design language that respects the Georgian and Victorian character of these exceptional streets.

Discuss Your Townhouse
Mayfair townhouse extension architects London — Rosace Studio

Working in Mayfair

Architecture in the heart of Central London

Mayfair's streets are defined by some of London's finest Georgian and Regency townhouses — properties of exceptional proportions and historic character that demand the greatest care in any intervention. The City of Westminster, which governs planning here, maintains strict design standards and expects a thorough understanding of heritage and conservation.

Rosace brings both the design quality and the planning expertise required to work successfully in this context. Our knowledge of Westminster's planning framework, combined with a sensitivity to the architectural language of these buildings, means we are well placed to guide projects through the process and deliver results of lasting quality.

Services for Mayfair Properties

What Rosace offers in Mayfair and Central London

  • —Lower-ground rear extensions and garden connections
  • —Whole-house refurbishments and reconfiguration
  • —Listed building consent applications
  • —Interior architecture and FF&E specification
  • —Basement conversions and lightwell additions
  • —Construction oversight and contract administration

Featured Project

Mayfair Townhouse, W1

A five-storey Georgian townhouse in the heart of Mayfair — extended at lower-ground level and comprehensively refurbished throughout. The brief was to create a seamless connection between the garden and the new kitchen-dining volume, while restoring the principal floors to their full Georgian proportions and introducing a contemporary interior language that respected the building's heritage without being constrained by it.

Location: Mayfair, London W1

Floor Area Added: 42 sqm

Scope: Concept Design · Planning Application · Building Regulations · Interior Architecture · FF&E · Construction Oversight

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Mayfair townhouse interior — living room
Mayfair townhouse interior — detail
Mayfair townhouse kitchen extension
Mayfair townhouse interior

Common Questions

Mayfair townhouse extensions — answered

What planning permission is required for a Mayfair townhouse extension? +
Mayfair falls within the City of Westminster, which has exacting planning policies. Most properties are in conservation areas and many are listed, meaning extensions almost always require full planning permission and potentially listed building consent. Westminster's planning officers expect a high standard of design and heritage sensitivity — Rosace has experience navigating this process successfully.
Can a Georgian townhouse in Mayfair be extended? +
Yes, though it requires careful design and thorough planning preparation. Georgian townhouses in Mayfair are typically extended at lower-ground level or through internal reconfiguration. Rosace's Mayfair Townhouse project is a recent example — a lower-ground rear extension creating a new kitchen-dining room connecting to the garden, with a full interior refurbishment above.
Does Rosace work in Mayfair and Belgravia? +
Yes. Rosace has direct experience working in Mayfair and across Central London, including navigating the City of Westminster's planning process and working on both listed and unlisted properties in conservation areas. Our Mayfair Townhouse project involved a five-storey Georgian townhouse, a lower-ground extension, and a complete interior refurbishment.

Mayfair & Central London

Own a townhouse in Central London?

Get in touch to discuss your property. We'll give you an honest assessment of what's achievable — including planning prospects and realistic timelines.

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