House Extension Westminster | Rear & Side Extensions

House Extension Specialists in Westminster SW1

House extensions in Westminster SW1 — whether in Belgravia, Pimlico, or Victoria — require specialist architectural expertise that combines design excellence with deep heritage planning knowledge. Crown Architecture delivers house extensions across Westminster, working with the Georgian, Regency, and Victorian properties that make SW1 one of the world’s most architecturally distinguished residential postcodes.

The most common extension types we design in Westminster include rear extensions to the garden elevations of Belgravia and Pimlico townhouses, basement conversions and extensions below the garden and front light well, and internal remodelling projects that create new living spaces within the existing fabric of listed properties.

All extension work to listed buildings in Westminster requires Listed Building Consent in addition to planning permission, and works within conservation areas require full planning applications. Westminster City Council’s planning officers apply rigorous design standards, and planning applications must be of the highest quality to succeed. Crown Architecture’s track record with Westminster planning applications is excellent — we produce heritage impact assessments, design-and-access statements, and detailed architectural drawings that satisfy the Council’s requirements.

Basement Conversions in Belgravia and Pimlico

Basement conversions are particularly popular in Westminster SW1, where the townhouse format and high property values make basement extensions highly cost-effective. We design basement conversions that comply with Westminster City Council’s basement policy, coordinating all aspects of the process from structural engineering through to party wall agreements with neighbouring properties.

Call or Text: 07443804841

Testimonials

• “Crown Architecture delivered a beautiful rear extension to our Belgravia townhouse, achieving Listed Building Consent and planning permission on the first application.” — Alexa Young, London
• “Our Pimlico basement conversion was designed and managed by Crown Architecture with exceptional expertise. A superb result.” — Morgan James, Islington
• “Outstanding architects for Westminster. The heritage planning expertise of Crown Architecture’s team is unrivalled.” — Lisa Driver, Milton Keynes

Related Pages: Architect in Westminster | Loft Conversion Westminster | House Extension Chelsea SW3

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