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    Westminster retrofit-first policy: design and viability notes for project teams

    January 13, 2026|

    Reviewed by Tom Sullivan

    Westminster retrofit-first policy: design and viability notes for project teams

    First reported on The Construction Index

    30 Second Briefing

    Westminster City Council has adopted a retrofit-first planning policy in its City Plan Partial Review, obliging developers to evidence options for retaining and adapting existing structures before applying for demolition and rebuild. The plan also tightens affordable housing requirements, shifting the tenure mix in new schemes from 40% to 70% social rent and from 60% to 30% intermediate, and capturing sites with fewer than 10 units through financial contributions. Four large mixed-use strategic sites are flagged for redevelopment: St Mary’s Hospital, Westbourne Park Bus Garage, land adjacent to Royal Oak, and Grosvenor Sidings.

    Technical Brief

    • Policy explicitly framed as “retrofit-first, not retrofit-only”, allowing demolition where engineering or safety constraints demand it.
    • Westminster positions the policy as potentially its single largest carbon-emissions reduction intervention across existing stock.
    • Other local authorities may treat Westminster’s retrofit-first wording as a template for future local plan revisions.

    Our Take

    Among the 76 Policy stories in our database, very few deal with such a sharp rebalancing of affordable housing tenure as Westminster’s move from a 40/60 to 70/30 social-to-intermediate split, which is likely to tighten viability margins for dense urban schemes and push design teams to extract more net lettable area from existing structures.

    Raising the affordable housing threshold from small sites in a high‑value borough like Westminster, while also adopting a retrofit‑first stance, signals to project teams at assets such as St Mary’s Hospital and Westbourne Park Bus Garage that phased refurbishment and vertical extension options may be favoured over wholesale clearance in planning negotiations.

    The designation of four strategic sites in central London within a sustainability‑tagged policy piece stands out in our coverage, as most similar UK items focus on borough‑wide standards rather than named assets, suggesting these locations could become early testbeds for how retrofit‑first is interpreted in transport‑adjacent and rail‑sidings contexts like Grosvenor Sidings and land adjacent to Royal Oak.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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