---
title: "Lansdowne Green Window Replacement"
ocid: "ocds-h6vhtk-0469d8"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0469d8"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-0469d8.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-0469d8.json"
source: "Find A Tender Service"
current_stage: "Award"
buyer: "SOUTHERN HOUSING"
published: "2026-02-10"
---

# Lansdowne Green Window Replacement

Buyer: SOUTHERN HOUSING  
Current stage: Award  
OCID: ocds-h6vhtk-0469d8

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## Summary

The public procurement process for the "Lansdowne Green Window Replacement" project, managed by Southern Housing, involves the installation of windows and related components at the Lansdowne Green Estate in Lambeth, London. The contracting was conducted using an open procedure, aimed at the construction industry under the category of works, with a legal framework based on the CELEX system. Initially, the estimated total contract value was 5,126,000 GBP. This tender process progressed through various stages, concluding with an award dated 10th February 2026. The procurement culminated in a contract valued at approximately 4,876,229.23 GBP, awarded on 24th March 2025 to Cosyseal (Double Glazing) Limited.

This contract presents significant opportunities for businesses involved in construction, particularly those specialising in window and door installation. With the project's scope encompassing occupied properties and communal areas, companies with expertise in managing such environments would find this tender especially advantageous. Small and medium-sized enterprises (SMEs), such as Cosyseal, which ultimately secured the contract, demonstrated competitiveness in the bidding process, which included eight bids with a criteria focus on quality and price. The procurement process, under an open procedure, further allows for electronic submissions, facilitating broader participation for qualified businesses across the UK and EU.

## Notice

Installation of windows within properties owned and managed by Southern Housing. The duration of the works is four years. The estimated total contract value is 5,126,000 GBP, excluding VAT.

### Lot Information

Lot 1

The scope of services are as follows: The works will be around occupied properties & communal areas consisting of: - Replacement of windows, - Replacement of Balcony doors, - Replacement of Dwelling Patio doors, - Clear out, repair, realign/ seal joints, to rainwater gutters and down pipes as needed

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/011833-2026 |
| Notice type | Tender Notice |
| Procurement type | Standard |
| Procurement category | Works |
| Procurement method | Open |
| Procurement method details | Open procedure |
| Tender suitability | Not specified |
| Awardee scale | SME |
| All stages | Tender, Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 10 Feb 2026 |
| Submission deadline | 21 Jun 2024 |
| Future notice date | Not specified |
| Award date | 24 Mar 2025 |
| Contract period | Not specified |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | £5,126,000 |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | £4,876,229 |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Cancelled |
| Awards status | Active |
| Contracts status | Active |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | SOUTHERN HOUSING |
| Locality | LONDON |
| Post town | Central London |
| Postcode | EC1M 5LA |
| Country | England |
| ITL 1 | TLI London |
| ITL 2 | TLI4 Inner London - East |
| ITL 3 | TLI43 Haringey and Islington |
| Local authority | Islington |
| Electoral ward | Clerkenwell |
| Westminster constituency | Islington South and Finsbury |
| Delivery location | TLI London |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 1 |
| Supplier names | COSYSEAL (DOUBLE GLAZING |

## CPV Codes

### Divisions

- 45 - Construction work

### Codes

- 45421100 - Installation of doors and windows and related components
- 45421131 - Installation of doors
- 45421132 - Installation of windows

## Release History

- 10 Feb 2026 at 12:31 - Award - Award Notice - https://www.find-tender.service.gov.uk/Notice/011833-2026
- 29 May 2024 at 07:50 - TenderUpdate - Tender Notice - https://www.find-tender.service.gov.uk/Notice/016678-2024
- 22 May 2024 at 16:01 - Tender - Tender Notice - https://www.find-tender.service.gov.uk/Notice/016234-2024

## Notice URLs

- http://www.southernhousing.org.uk
- https://www.effefftee.co.uk
- https://www.mytenders.co.uk
- https://www.mytenders.co.uk/search/Search_AuthProfile.aspx?ID=AA8521

## Provenance

This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0469d8. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-0469d8.json.