We will work safely or not at all


Client requirements

In December 2020 40SEVEN were successfully awarded a place on the TfL Engineering Topographical Consultancy Framework. It wasn’t until June 2021 40SEVEN carried out our first Topographical Survey under the framework. Over the proceeding 9 months 40SEVEN methodologies have been updated, and specifications amended. We now believe our surveys are completed faster and to the utmost quality utilising a variety of survey techniques most applicable to the design requirements.

Understanding the future use of the surveys we provide and the environment in which they are undertaken enables us to determine the best methodology and equipment to use. Whether that be traditional total station works, vehicle mounted laser scanning, static scanning, or on-site data analysis.


40Seven Solution

In order to undertake the huge distances of surveying required, 40SEVEN used two solutions: vehicle mounted laser scanning and on-site data analysis – verification surveys.

Carrying out surveys by vehicle mounted laser scanning enabled us to cover large distances very quickly without the need for any traffic management. The scan data is then processed and transformed onto the permanent ground control network established on site.

We carried out verification surveys of areas of interest where a topographical survey had already been completed previously in order to check for changes in the road layout and road markings. To do this we would walk the survey area with an iPad visually checking the data and recording various dimensions before traditionally surveying any amendments that are required.

Ed Elbrow
Business Development Manager
Contact 40Seven

The results

So far 45,000m of the road network within central London have been topographically surveyed including the installation of approximately 600 control stations all with their own location diagrams, an example of which is shown here.

The majority of our surveys are carried out in 3D and issued in AutoCAD with an accompanying survey report clearly illustrating survey accuracies and control network information.

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Industry-leading surveying services, delivering the right data at the right time.