Geo-Environmental Services | Horsforth Mills, Leeds

Geo-Environmental Services

Client: Horsforth Mill Ltd
Project: Integrated survey investigations and civil / structural appraisals and design for residential development
Contract Value: £10.6m
Completion: 2017


  1. Survey
  2. Topographical
  3. Utility Mapping
  4. Geophysical
  5. Measured Building
  6. Inland Waterway
  1. Engineering
  2. Structural Appraisal
  3. Ground investigation
  4. Drainage design
  5. Highways design
  6. Foundation Design
  7. New build steel frame design
  8. Existing building refurb design

Providing an integrated geo-environmental service solution covering survey investigations, desk studies, site investigation, structural and civil works.

Project Overview

The project concerns the part demolition, refurbishment and extension of an early 19th century river-side worsted mill and warehousing complex with addition of a new fifth floor and six-storey new build to provide residential apartments located in an affluent urban area of outer Leeds. Met has been involved since the inception of this scheme providing an integrated geo-environmental service solution covering all required survey investigations, desk studies, site investigation and remediation, structural and civil appraisal and design.

Technical Overview

This scheme has presented a range of technical challenges from the poor state of the original buildings to unstable ground conditions and a constrained urban site location adjacent to a flood-prone beck.

The desk study highlighted a number of infilled ponds and mill races which used to cross the site. Using this information the site investigation was targeted to these areas and along the adjoining river bank due to the possibility of large quantities of soft and infilled ground.

The ground conditions were found to be exceedingly soft which, with the additional weight of the extended building, required piling whilst the new foundation installations required careful detailing to avoid undermining the adjacent existing older structure. Targeted soil sampling and gas monitoring was also undertaken to inform the requirements for remediation.

The state of original four-storey building required progressive collapse provisions to be incorporated into the structure to allow its extension to five storeys. The structural steel frame for this and six storey new-build extension were designed and detailed in a combination of Masterseries Structural Analysis & Design software, Revit and Autocad.

The project is ongoing and currently out to tender for construction and when completed will provide much needed housing stock for this area