Removal of Existing Conservatory & Associated Works - Richmond House, Richmond Park, Gainsborough

Gainsborough Town Council invites tenders for the careful removal of an existing glazed conservatory and associated restoration works to the Grade II listed Richmond House, located within Richmond Park, Gainsborough. Works include demolition, masonry repair, joinery, sash window manufacture and installation, internal making good, decoration, and compliance with planning and heritage conditions.

1. Programme & Site Access

• Contractor to supply a proposed programme of works for approval before commencement.
• Access routes and site arrangements must be coordinated to avoid unnecessary disruption to site users and maintenance operations.

________________________________________

2. Planning & Consent Conditions

All works must be undertaken in accordance with the following approved drawings:

• Ref: RD:5236 - 04 Rev A (June 2024) - Existing Site Plan
• Ref: RD:5236 - 03 Rev C (June 2024) -Plan and Elevations
• Ref: RD:5236 - 07 Rev B (June 2024) - Window Details for Reception and Office.
• Ref: RD:5236 - 08 Rev B (June 2024) - Site Plan (Extension & Window Details Only).

Condition 3 - Masonry Samples

• No new masonry to be installed until brick and stone samples have been submitted to and approved by the Local Planning Authority (LPA).
• Samples to include a test panel of brickwork (type, bond, mortar, finish) and proposed sills and heads.

Condition 4 - Window & Joinery Drawings

• Prior to installation, 1:20 scale drawings to be submitted for approval, showing materials, finishes, protective coatings, cross-sections, glazing details, and colour proposals.

Condition 5 - Brickwork Cleaning

• Method Statement to be submitted for approval before commencement of any brick cleaning, in compliance with BS 8221-1:2012.
• Works must strictly follow the approved methodology.

________________________________________

3. Description of Works

3.1 Demolition of Existing Extension

• Carefully dismantle the glazed extension to prevent damage to the main structure and surrounding site.
• All arising debris to be cleared and disposed of in accordance with regulations.

3.2 Removal of Base and Floor Construction

• Break out the existing slab and base down to the level of adjoining paving.
• Dispose of waste safely and responsibly.

3.3 External Wall Alterations

• Remove render, plaster, and paint to walls affected by removal of structure.
• Repoint brickwork with lime-based mortar.
• Rebuild external wall sections as required, forming new window openings with matching lintels and sills.

3.4 Timber Sash Windows

• Manufacture and install two new hardwood sliding sash windows to replicate the original appearance.
• Include sash weights, ironmongery, and detailing in line with existing style.
• All units to comply with approved drawings.

3.5 Internal Making Good

• Repair disturbed walls, ceilings, and joinery to match existing finishes.
• Apply lime plaster to walls and ceilings.
• Use joinery-grade softwood for replacement or repairs.

3.6 Decoration & Finishes

• Prepare and paint all new plasterwork and joinery.
• Paint sash windows internally and externally.
• Decorate affected doors and frames, with colour schemes approved in advance.

3.7 Site Management & Documentation

• Provide temporary site facilities, security, and welfare as necessary.
• Submit RAMS, Construction Phase Plan, and maintain a Health & Safety File in compliance with CDM.

________________________________________

4. Quality & Standards

• All works to be executed to a high standard of craftsmanship.
• All materials must be new, high quality, and consistent with the historic character.
• Works must comply with:

o National heritage and listed building policies.

o Relevant British Standards and current Building Regulations.

o Health & Safety legislation.

________________________________________

5. Completion & Handover

• At practical completion, provide warranties, certification, and maintenance instructions.
• Leave the site tidy and free from construction waste.