The ambitious scheme at 980 Great West Road spans 13 acres and will see over 2,300 homes built across a mix of tenures, with 35% classed as affordable.
The plans also include around 330,000 sq ft of commercial and retail space, creating a new mixed-use neighbourhood along the M4 corridor.
Former Glaxo HQ building at redevelopment site where 96% of building basement and substructure will be retained
Hadley, which bought the site three years ago, plans to retain and adapt two major buildings from the original campus – including the landmark tower – to cut embodied carbon and deliver new homes with oversized balconies, shared amenity areas and a rooftop conservatory.
A pioneering approach to retrofit and reuse will save more than 34,500 tonnes of embodied carbon in the demolition and construction phases
Studio Egret West is leading the tower’s redesign while also working on new affordable housing and extensive landscaping.
More than 60% of the site is earmarked for public realm, with new play areas, gardens and access to the River Brent and Boston Manor Park.
The proposals also include 23,000 sq m of employment space, with flexible units for local businesses, markets and events.
Hadley says its plan will open up a previously closed site, creating “arrival, central, underside and riverside” zones to reconnect the historic campus with Brentford High Street.
A strip of public space known as the Underside will run below the M4
Architects Haworth Tompkins, with Studio Egret West, Metropolitan Workshop and DRMM are all involved in the design.
The project team also includes TPS as project manager, Gardiner & Theobald as quantity surveyor and Buro Happold covering MEP.
Andy Portlock, CEO of Hadley, said: “Reaching this milestone is down to the way we’ve been able to work with a local authority that is genuinely committed to growth and has a clear strategic vision for one of the most exciting places in London.
“Alongside a pioneering approach to retrofit at this scale is a very clear commitment to people and place. A broad range of tenures, a new NHS primary care facility, a tech and innovation hub are all part of a new neighbourhood at the heart of the emerging Golden Mile district.”