O’Sullivan Civil Engineering was founded by Frank O’Sullivan in 2000 after spending many years subcontracting in different sectors of the construction industry from heavy civil engineering projects to small ground work RC frame jobs.

OSCE operates as a contractor throughout London and South East England. Our main services are in Groundwork, RC Structures (Formwork), Basement construction and Temporary works.

We are specialists in basement construction, working closely with a number of construction companies, property developers, builders and private clients.

We aim for the highest standards of site safety, tidyness, efficiency and environmental management.

We are a member of ASUC plus, Association of Specialiast Underpinning Contractors, the independant trade association for the underpinning industry. This means that we have passed very strict technical and financial audits from ASUC to gain membership.


OSCE has invested substantially to ensure consistent quality and quality control of projects. At the core of Quality Assurance is investment in training our site staff.

OSCE is Construction Industry Training Board (CITB) registered. We pride ourselves in the level of training we give to our employees and have a highly experienced and loyal workforce who all hold CSCS cards. Employees are constantly being assessed and are encouraged to achieve their next level of qualifications.

This continuous programme of training is as vital to our effectiveness onsite as it is for individual staff development.

Whilst this does involve dedicated H&S training the emphasis is on organisation and teamwork that we believe is vital to effectively delivering high quality projects. We also believe that this approach enhances health and safety onsite by focusing on the combined effect the team has on the working environment.

Charities we support




September 2017 New Job – St. Johns Wood

Underpinned basement to existing house.

June 2017 New Job – Kingston

New build basement for Passivhaus development.

June 2017 The Trans Atlantic Way 2017

The inaugral Trans Atlantic Way of 2016 was so successful that Adrian O’Sullivan (Contracts Manager) is holding the event again this year in June.

June 2017 New Job – Highgate, North London

Secant piled basement for a new house.

September 2015 Sponsorship of Chipstead Rugby Club

OSCE sponsor the local Chipstead U12 rugby team who have recently received their new kit.