Portcullis House, Glasgow

Portcullis House is a proposed 35-storey skyscraper in Glasgow, Scotland. The development was formally submitted to Glasgow City Council in 2021 by Watkin Jones Group, with the original proposals seeking to construct a 33-storey "co-living" development in Glasgow City Centre. New plans submitted in 2023 saw the removal of one of the original proposed towers, and the reduction in size to a 30-storey tower. In December 2023, an updated plan was submitted, proposing a 35-storey building rising to 114m above ground level.

Upon completion, Portcullis House would become the tallest habitable building in Scotland.

Background
The original structure was a brutalist style building constructed in the early 1970s for the former Glasgow Cooperation. The original building would later become offices for HM Revenue & Customs Glasgow government offices at Portcullis House. Early development plans of the site included a hotel, however, plans were scrapped and the building was put up for sale in August 2020, with Glasgow City Council submitting a failed bid to buy the site. A developer, later known to be Watkin Jones Group, purchased the site and existing building.

Watkin Jones Group purchase of the site at India Street in Glasgow was finally completed by October 2020 for an undisclosed sum. The development would mostly consist of both living accommodation as well as student accommodation facilities, with proposals for Class 3 food and drink services also operating from the site.

In June 2023, Scottish Construction Now announced that the development was currently "on hold", with a spokesperson claiming the proposals were placed on temporary hold "due to a lack of policy or guidance from the council upon which planning applications for co-living could be assessed". However, that same month, it was reported that developers, Watkin Jones Group, launched a second round of consultations regarding the project development, referring to the development as a "vertical city". Working with Hawkins & Brown Architects as well as Harrison Stevens landscaping architects, the recent plans propose high-rise student accommodation on the site, with the potential of incorporating part of the existing structure in order to reduce and minimised embodied carbon.

Design
The development at Portcullis House aims to be a major part of the Glasgow City Centre regeneration strategy. The development project outlines its vision for the development, saying that it seeks to "incorporate high-quality design, materials and construction methods from an early stage, ensuring the building is designed for a long life span and can be re-used in the future".

Despite previous planning applications aiming to demolition the existing structure, there had been consideration given to retaining the existing building and incorporating it into construction design and proposals in order to "help reduce the embodied carbon of the new development". However, an application for prior approval of demolition of the existing Portcullis House on the site was approved by Glasgow City Council on 18 February 2021.

The proposed ground floor of the development would be designed to complement the already established and existing streetscape as well as public space improvements around the area. The developer said in a statement that “Uses at ground floor will help activate the streets around the building to bring vibrant new activity to this part of the City Centre, enlivening the frontage to the M8, creating more of a sense of place around Charing Cross Station and re-establishing this as a people-centric part of the city. Throughout the upper floors of accommodation, there is a mix of both en-suite cluster rooms and individual studios giving a good variety of accommodation choice for students throughout the height of the scheme".

Usage
Developer of the project, Watkin Jones Group, intends for the creation of approximately 279 "build-to-rent" apartments as well as 406 co-living studios. Each of the build to rent developments will consist of either 1, 2 or 3 bedroom facilities which would be located in the northern tower of the development. The Co-Living studios will be housed in the southern element of the building and would be linked to the build to rent accommodation building by a lower level plinth construction.

Watkin Jones Group claimed that the proposed development at Portcullis House would act as a catalyst for development and change in Glasgow City Centre and that they have "considered the wider site context and identified key opportunities which would enhance and regenerate this area in line with the City Centre Strategy". The developer argued that the development will spearhead the process of regeneration in Glasgow that would see benefits for "both local users, residents and the wider city centre".

Impact
Historic Environment Scotland raised no objections to the development of Portcullis House, stating that the proposed development and demolition of the existing Portcullis House government office building "raises no historic environmental issues in the national interest". Transport Scotland also made no objections to the proposals, but did highlight recommendations to the developer such as no means of direct access to the Trunk Road either pedestrian or vehicular, no drainage connections to the trunk road drainage system, no advertising signage visible from the Trunk Road Network, and, other recommendations relating to the transportation of construction materials and traffic management around the site.

NATS objected to the proposals and began to investigate mitigation measures which had been approved by stakeholders. NATS objected the proposal development, and argued that no construction shall begin until a Radar Mitigation Scheme has been agreed with the operator and approved via writing by the local authority planning department. Additionally, NATS argued that given the proposed elevation and characteristics of the building, it increased the risk of the building reflecting radar energy and giving false radar readings to aircraft from nearby radar targets given the buildings "obstructed line of sight". In September 2021, NATS confirmed they were fully engaged with the applicant to identify and design a technical solution in form of modification to the existing NATS radar to prevent mitigation of radar reflections from the building. Glasgow Airport also raised concerns and initial objections to the development on the grounds of aerodrome safeguarding perspectives, stating that the development could conflict with safeguarding criteria at the airport and required a more detailed assessment to be carried out in order to detail the potential impact on the airports operations.

Other agencies, including Scottish Power, objected the plans, claiming that that proposals are contrary to the city development plan, the development will cause significant, unacceptable impact on Scottish Power's operations, and the lack of consideration given to existing Scottish Power services already at the site. Network Rail stated no objections to the development, but did highlight recommendations which would be required to be met such as construction work not commencing until a construction method statement, which includes plant details, locations and lifting plans, is submitted to the Planning Authority for approval and agreed in conjunction with Network Rail's Asset Protection Engineers, details of any proposed piling works must be submitted to the Planning Authority for approval and agreed in conjunction with Network Rail's Asset Protection Engineers. Track / structure monitoring may be required during any proposed piling works, and also highlighted consideration to be given to the electrified railway adjacent to the site, the demolotion of the existing Portcullis House and ensuring it does not impact on the safe delivery of rail services and no additional loading or surcharge placed on both the Finnieston and Charing Cross tunnels by the proposed development and that all proposed works adjacent to the tunnels must be subject to further discussions and agreement with Network Rail.