Open-Plan Conversions Pimlico

GS Renovation creates open-plan and broken-plan spaces in Pimlico, adapting the tall, compartmented rooms of SW1's stucco townhouses and conversion flats into connected kitchen-diners and flowing living areas. We handle the steelwork behind a knock-through and the finish in front of it, from clean sightlines to Crittall-style glazed dividers.

In Pimlico, a knock-through finished as one room typically costs £3,000 to £8,000 or more, including the steel beam (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Pimlico: the structural engineer we appoint designs the steel, we install it, and building control signs it off.

How the job runs

1. Free site survey at your Pimlico address, covering the walls, services and floor levels, and an itemised quote.
2. The engineer we appoint sizes the beam, and the work is registered with Westminster City Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
3. Props in, opening cut, beam on padstones; then floors, heating and electrics are joined up.
4. Building control inspects the steel before it is covered. We finish the room, and the completion certificate follows.

Open-plan living in Pimlico townhouses

Pimlico's 19th-century houses were designed as a series of separate rooms, so opening the ground floor into a single kitchen-diner usually means removing a load-bearing dividing wall rather than a light partition. Because that wall carries the floors above, a structural engineer sizes the steel beam that takes its place, and we install it on padstones with proper temporary propping and staged demolition.

Not every client wants a single wide-open box, and in these period rooms a broken-plan approach often suits the proportions better. Crittall-style glazed dividers let light travel between the kitchen and dining area while keeping a sense of the original rooms, and they can be set beneath a structural opening so the layout feels connected without losing the character of the townhouse.

Housing in Pimlico

Take the 10,180 or so homes the valuation list gives Pimlico: 94% flats, 6% houses, 55% from before 1919, 10% interwar and 34% post-war. Where most homes are flats, opening up a flat in Pimlico changes the protected route from the bedrooms to the front door, so building control checks the escape before any wall comes out.

Opening up post-war and interwar flats in Pimlico

Pimlico is known for stucco, but 34% of its homes were built after 1945 and 10% between 1919 and 1939, so an open-plan scheme here may well be in a block rather than a period house. In those blocks the question is less about the beam and more about what the wall is. A plastered partition may come out with little structural work, while a concrete cross wall or a wall enclosing the flat's protected hallway may not come out at all. The structural engineer we appoint starts from the block's drawings, and the fire design starts from the building's own strategy.

The approval route follows the building rather than the size of the job. Westminster allows a building notice only where the work leaves the layout unchanged and is not affected by the Fire Safety Order (RRO), and a block with a common stair or corridor is covered by that Order. An open plan fails both tests, so the drawings go in as full plans. Ask the managing agent for the fire risk assessment of the common parts before design starts, because the flat entrance door and corridor walls it relies on must stay as fire resisting as they were.

Getting a Pimlico knock-through signed off

A ground-floor knock-through in Pimlico's terraces almost always involves the party wall shared with next door, so where the new beam bears into that wall the Party Wall Act applies and you serve notice on the adjoining owner as building owner before work begins, using the drawings we supply. Getting this settled early keeps the project on schedule rather than stalling it once the props are up.

The steel beam and the new opening are notifiable under the Building Regulations, and Westminster City Council's building control signs off the finished structure. This is not a planning matter for internal work: planning is a question for external changes, not internal ones, but a listed home needs listed building consent for internal work too. We confirm your property's status and manage the building control side from start to finish.

• Heat loss and acoustic considerations before the wall comes out
• Open-plan kitchen-diner conversions
• Lighting, heating and electrical reconfiguration

VOA Council Tax stock of properties, March 2025, for Pimlico North and Pimlico South. Counts rounded by the VOA.

Alongside open-plan conversion in Pimlico, the pages that usually help next are home renovation in Pimlico, open-plan conversion across Westminster, side return infills, converting a garage into living space, how we handle open-plan conversion across London and Kitchen Island Guide.

Trusted Open-Plan Conversions in Pimlico

For open-plan conversions in Pimlico, GS Renovation delivers both the structure and the finish through one accountable team. We appoint the engineer who designs the beam, give you the drawings for any party wall notice you serve, coordinate Westminster building control, and install the steel, the knock-through and any Crittall divider cleanly. Our founder's 30+ years on the tools means a connected, characterful result done safely and certified.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.