Challenge

The existing single-glazed units now present multiple issues:-

• Poor thermal performance and energy inefficiency
• Ongoing maintenance challenges
• Limited comfort for teaching and learning environments.
• The project seeks to replace the outdated fenestration with new, high-performance double-glazed systems while respecting the building’s listed status and heritage value.

Objectives

• Improve energy efficiency, durability, and ease of maintenance.
• Enhance thermal comfort for pupils and staff.
• Ensure compliance with planning/listed building requirements.
• Provide a consistent and coherent external appearance that remains true to the original design.

Role & Responsibilities

Carré Consultancy have been appointed under the TKAT Framework (Lot 1 – Property Consultants) to:-

• Act as Principal Designer.
• Provide architectural, structural and engineering consultancy services.
• Prepare the design specification, tender documentation, and manage procurement.
• Lead on planning applications and listed building consents, including liaison with Bromley Council and Historic England.
• Manage project delivery through tender assessment, contract administration, site inspections, and final handover.

Planning & Heritage Strategy

At pre-application stage, two replacement options were presented to the Local Planning Authority:-

• Option 1 – Full Aluminium Replacement (Preferred): Replicating the appearance and proportions of the Crittal frames with modern aluminium systems.
• Option 2 – Mixed Approach: Steel reinstated on principal street-facing elevations and the main hall, aluminium elsewhere.

The Trust’s preference is Option 1, which balances sustainability, performance, long-term management, and visual consistency. Early feedback from Conservation and Planning Officers is being sought to establish whether aluminium will be supported, or whether a hybrid solution will be required.

Key Issues & Risk Management

• Heritage and Planning Risk: Careful consultation with Conservation Officers, Historic England and stakeholders to ensure acceptability of aluminium solution.
• Asbestos: Potential asbestos-containing materials in window surrounds and classrooms require specialist surveys and management.
• Live School Site: Works planned during term time, requiring detailed phasing, safeguarding measures (DBS checks, secure work areas), and noise/dust control.
• Interfaces: Coordination with fire alarm, intruder alarm and access control systems linked to windows and doors.