City of Westminster Architects and Interior Designers
Architects and Interior Designers in Westminster
Westminster holds one of the densest concentrations of listed buildings in London, from the Georgian terraces of Mayfair and Belgravia to the mansion blocks of Marylebone and Victoria. A grand stucco house on a Belgravia garden square, a mews property off Shepherd Market, and a conversion above a Soho shopfront each sit under the same demanding planning authority but call for entirely different structural and design approaches.
Doll & Co. is a RIBA Chartered Practice. Our architects and interior designers across Westminster work together from the first sketch, so the planning strategy, the structural approach and the finished interior are resolved as one scheme rather than handed between specialists at different stages.
Architectural Services Across Westminster
Our architectural services across Westminster cover feasibility, pre-application advice with Westminster City Council, planning, building regulations and construction oversight. In practice, this means:
Heritage-led design for Georgian and Regency terraces, garden squares and mews streets
Basement extensions sequenced around Westminster's strict policy on scale, structure and neighbouring impact
Mews access coordination in Mayfair and Belgravia, where loading and deliveries are tightly constrained
Conversion of mixed-use buildings above shops and theatres in Soho and Covent Garden, with acoustic separation planned from the outset
A planning narrative tested early and kept consistent with the drawings throughout
Basement Extensions in Westminster
Westminster applies some of the strictest basement planning policy in London, alongside RBKC. Before committing to design fees, we confirm:
What scale of basement the specific site and garden can realistically support
Structural impact on neighbouring listed buildings sharing party walls
Waterproofing and ventilation requirements for below-ground gyms, cinema rooms or staff accommodation
A realistic sequencing and monitoring plan so neighbours aren't surprised by noisy stages
Working With Period Features
Most Westminster projects involve restoring or integrating original features alongside new interventions. We coordinate:
Decorative plasterwork and cornicing repairs
Marble and stone fireplace surrounds
Integrated shutters and sash window alignment
Smart lighting and discreet control points that don't disturb original ceiling lines
Interior Design Services Across Westminster
Our interior design services run alongside the architecture, not after it. This covers:
Period properties with generous proportions — refining dining, kitchen and reception layouts without losing formality
Mansion block flats in Marylebone and Victoria — working within structural openings the building's original fabric allows
Acoustic measures for conversions above commercial premises in Soho and Covent Garden
A client decision schedule that locks façade-facing approvals, internal finishes and M&E items before they become urgent
Planning Permission in Westminster
Article 4 Directions remove permitted development rights across most of the City of Westminster, so most extensions, loft conversions and basements need a full planning application regardless of size
Conservation areas cover the majority of the borough, including Mayfair, Belgravia, St James's, Soho and Covent Garden, each with its own expectations around materials and street-facing alterations
Pre-application advice is recommended for most schemes, particularly anything affecting a listed building
The party wall process typically runs 8 to 12 weeks and should be built into the programme from the outset, given how closely Westminster's terraces and mansion blocks share walls
Neighbourhoods We Serve in Westminster
Mayfair
Marylebone
Belgravia
Soho
Covent Garden
Paddington
Victoria
St. James's
Frequently Asked Questions
Do I need planning permission for an extension anywhere in Westminster?
Almost always, yes. Article 4 Directions across the City of Westminster remove the permitted development rights available in less restricted areas, so most extensions, loft conversions and basements require a full planning application regardless of size.
Which conservation areas cover Westminster?
The majority of the borough sits within conservation areas, including Mayfair, Belgravia, St James's, Soho and Covent Garden. Each carries different expectations around materials, roofline and street-facing alterations.
Can I add a basement to a property in Westminster? Often, yes, but Westminster applies some of the strictest basement policy in London. We assess structural impact on neighbouring buildings and realistic scale at feasibility stage, before any design fees are committed.
Can I convert a building above a shop or theatre in Soho or Covent Garden into a home? Yes, this is common in both areas, but it raises different questions than a domestic terrace — particularly acoustic separation from commercial premises below and what the existing structure allows.
How long does planning permission take in Westminster? A straightforward householder application typically takes 8 to 13 weeks from validation to decision. Schemes affecting a listed building or a conservation area frontage usually take longer.
Visit Our Studio
Our studio is based at 33 Newman Street, London W1T 1PY, with a second studio at Woodseats Studio, Bighton Road, Alresford, Hampshire GU34 5ND. Call us on 020 3870 7262, Monday to Friday, 9am to 6pm.
Why Westminster Homeowners Choose Our Architects and Interior Designers
RIBA Chartered. Our professional duty is to you, not to a contractor's margin.
One team. Architects and interior designers work on your project from the first sketch.
Borough experience. We work across Westminster, RBKC, Islington, Camden and Southwark, and understand what each planning authority expects.
Honest feasibility. If a basement or extension is unlikely to succeed, we tell you before design work begins.
Speak to Our Westminster Architects and Interior Designers
Whether you are considering a basement beneath a house in Belgravia, a mews renovation in Mayfair, or a conversion above a Soho shopfront, we would be glad to discuss what your property and its planning context allow.
Disclaimer: The information provided on this page is for general guidance purposes only. Every property and project is unique, and specific planning considerations, costs and timelines must be evaluated on an individual basis following a formal project consultation.