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Construction starts on M25 warehouse

Posted on Tuesday 18 August 2026

British railways pension scheme manger Railpen, has started construction works on its South Mimms X warehouse just off the M25 motorway in the Southeast.

By Liza Helps, Property Editor, Logistics Matters

THE PROPERTRY which totals 122,820 ft2 has a completion targeted for Spring 2027, it will be the latest addition to Railpen’s growing industrial portfolio, which comprises state-of-the-art, prime Grade A industrial and logistics facilities located strategically around the M25. Railpen’s latest milestone in its investment into the logistics and industrial sector, developed in partnership with Wrenbridge.

Located at the intersection of the A1(M) and M25, adjacent to South Mimms Services, South Mimms X will be built to target BREEAM Outstanding and EPC A+ ratings, it will feature 110,258 ft2 of warehouse space  with 15m eaves and will have 13 dock, two Euro dock, and two level access doors served by a yard with a depth up to 68m. It will be well-positioned to support the transition to EV fleets, with 18 active EV charging spaces, alongside 98 car parking spaces. 

It will also deliver 2.5 acres of landscaped amenity space, achieving a 30% biodiversity net gain through features including on-site wildlife boxes and an urban orchard.

The development will join Railpen’s expanding ‘X’ branded portfolio of industrial sites, alongside Dartford X, Waltham X and High Wycombe X. Each development is strategically located and designed to meet occupier demand for best-in-class, highly sustainable industrial space.

Joint agents are Savills, BNP Paribas  Real Estate and Adroit Real estate

 

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Logistics Matters