Dartmouth Street London No 21

  • Client

    Confidential Government Client

  • Contractor

  • Value


  • Completion Date

    April 2022

Form of Contract: NEC3 Engineering and Construction Contract April 2013

Procurement Type: 2 Stage

Contract Period:  97 weeks

Size: 55,000 sqft

The project comprised of the refurbishment and upgrade of the client’s estate under their ‘Restoration and Renewal Programme’. The project endeavored to deliver maximum flexibility and usability for a design life of 15 years, achieving BREEAM Excellent.

The project included CAT B fit out of offices, a new reception, new meeting rooms and collaboration spaces. The scope of works also included structural alterations, window replacements and external works and security enhancements of 55,000 sq ft over 9 floors including roof and terraces in a 1920’s building.

The Challenge

Multiple stakeholder engagement
The scope included the decant of large numbers of staff to allow 750 new staff to occupy their new space.

Engaging with government recommended contractors
ISG had to liaise with government recommended subcontractors with their own works packages within the building.

Delivering in a Global Pandemic
The PCSA and part of the construction period spanned the unprecedented Covid-19 Global Pandemic.

Challenging logistics
The project was located in central London, with the building located on a busy road. The building was occupied for the duration of the works.

Base build fit out
It became clear the CAT A wasn’t fit for purpose; extensive reparations were required before the CAT B could begin.

The Solution

Multiple stakeholder engagement
ISG engaged early in the preconstruction phase with incoming government departments to build a move-in calendar for each department. They also held coordination workshops with the client’s in-house design team, data teams, security and maintenance teams, and catering teams.

Engaging with government recommended contractors
ISG engaged at tender stage with government recommended subcontractors and incorporated their specialist programmes into their master programme to calibrate and synchronise their works.

Delivering in a Global Pandemic
ISG’s industry leading Covid-19 safety measures ensured minimal disruption to the project despite lockdowns and social distancing measures, in the challenging conditions of an unprecedented global pandemic.

Challenging logistics
The logistics of the site was very tight. The scope included the removal and replacement of the lift motor room. ISG agreed the use of a full height hoist to the front elevation for movement of materials and operatives into the building. Neighbouring businesses and residents were kept informed of progress and the team received zero complaints of disruption.

Base build fit out
After notifying the client of the issues with the base build, ISG removed infrastructure back to risers and validated all CAT A base-build plant, effectively providing the client with a turnkey solution.

The Results

Early engagement with government subcontractors enabled the programme to progress efficiently and smoothly

The ISG and client team remained safe, proactive, focused and driven to achieve all key sign offs and milestones throughout the project lifecycle

The occupants of the space moved into their new offices on time, with support of the ISG team

Neighbouring business and residents were satisfied with the logistics approach, resulting in zero complaints

Effectively delivered a turn-key solution for the client

Contractor Performance | Commitments


100% payment within 30 days


Achieved BREEAM Excellent




Handover & Aftercare Contractor Promise


ISG maintains ongoing community engagement with three organisations:

The Passage – refurbishment of their entrance / circulation / break out zones

One Westminster – welfare facilities refurbishment

St Mungo’s – PPE donations

SCF Framework Manager

Alex Nelhams

Email: alex.nelhams@hants.gov.uk

Phone: 07717 003869

Contractor Framework Manager

Matt Glass

Email: matt.glass@isgltd.com

Phone: 07929755500