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Construction Specialists Covering London and the Home Counties.

Datum is a main contractor, undertaking all aspects of construction in London and the Home counties. We strive to deliver our projects, on budget, on time, every time. Whether a new build, extension or refurbishment, we aim to exceed our clients expectations.

Our record on repeat business and past client recommendations is testament to our success in achieving this.


Click to see our London services.


Click to see our Home Counties services.


Click to see our Mechanical and Electrical services.

Memberships and Accreditations

Let’s Build Something

We undertake all work including domestic and commercial developments, renovations, restorations and conversions. We have a team of skilled and experienced tradespeople to take care of all your building and maintenance needs.
The Vaults, 28 Castle Street, Hertford, SG14 1HH
01992 300678

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