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Your nearest office: Potters Bar (UK HQ)

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When you choose a construction services provider, you are choosing one of your most important business partners.

O'Neill & Brennan are a dedicated construction solutions business.  We offer a long standing and trusted brand with significant industry expertise gained over 25 years that we harness to deliver first class recruitment solutions for our clients and candidates.

Some of the Great Companies we work with

Bowmer & Kirkland
Crest Nicholson
Drew Smith Group
Galliard Homes
John Sisk
Lagan Construction
Laing O'Rourke
Linden Homes
McLaren Construction
Miller Homes
Morgan Sindall
Rydon Construction
Sir Robert McAlpine
St George
Taylor Wimpey
Tolent Construction
Vinci Construction
Willmot Dixon
Osbourne Construction
Work Place Solutions
United Living
Byrne Group

Take a look at some of our live jobs

We seek to provide our candidates with the best possible fit for convenience, money and job satisfaction


I just wanted to pass on my thanks for the great service that O'Neill & Brennan have carried out once again here at Torness power station in supporting our 2015 outage works. The service has been first class, as it was when you stepped in last year. Thanks for the great services and support.

Andy Clements - Workplace Solutions

Andy Clements - Workplace Solutions

O'Neill & Brennan have worked with us on a number of temporary and permanent staffing requirements for Rydon Group. Their consultants took the time to understand our culture, values and needs providing an effective end to end service. They value their partnership with us and as such are committed to the highest quality customer service.

James O'Loughlin - Rydon Group

James O'Loughlin - Rydon Group

I have worked with O'Neill & Brennan for a number of years to source Project, Site and Design Managers for my projects. They fully understand my brief and the calibre of people Wates Construction require. I know all the people they represent have been met, fully briefed and are up to our standard, as such they are my first call each and every time.

Gary Smith - Operations Director - Wates Construction

Gary Smith - Operations Director - Wates Construction

I have been working with O'Neill & Brennan over the last 6 months and found their service to be quick, efficient and responsive to my company's needs. O'Neill & Brennan have managed to supply site managers at short notice and are always available on the phone should any queries or positions arise.

Daniel Salter - Project Manager

Daniel Salter - Project Manager

I have had a long standing business relationship with O'Neill & Brennan, and I have always been very impressed by their professionalism. I have always received a friendly, and above all in today's market; a fast and efficient service. They work quickly to send across appropriate quality candidates that match the requirements and fit the culture of our business.

Kerry Booth - HR Advisor

Kerry Booth - HR Advisor

O'Neill & Brennan have always managed to fulfil our needs at short notice providing an excellent service and solving any problems. I have found O'Neill & Brennan a pleasure to work with and always contactable on the telephone and short notice. I would gladly recommend O'Neill & Brennan for their services for being a reliable, efficient and trustworthy agency.

Gareth Hill - McLaren Construction

Gareth Hill - McLaren Construction

O'Neill & Brennan have supplied Labour & Trades Operatives on our various civils projects including Coastal defence works at Sumburgh Airport, Shetland Islands. O'Neill & Brennan have consistently supplied us with the right quality of operative needed for all requirements we came to them with. I would have no hesitation in recommending them in the supply of Labour & Trades to contractors in the civils sector.

Danny McLaughlin - Senior Project Engineer

Danny McLaughlin - Senior Project Engineer

I have used O'Neill & Brennan to fill two positions recently and I have had a fantastic service, very efficient with good quality candidates. In both instances the 1st person we interviewed was a good match and taken on. I would recommend O'Neill & Brennan to others and would use them at my first point of call for any other vacancies I need filling. Skanska Building

Senior Project Manager

Senior Project Manager

O'Neill & Brennan were thoroughly professional in finding me the opportunity at Willmott Dixon Interiors. Their dedication, attention to detail, and market knowledge were impressive. Nothing too much trouble - always contactable and kept me informed at all times. I recommend O'Neill & Brennan whether looking for work or staff.

Senior Operations Manager - Willmott Dixon Interiors

Senior Operations Manager - Willmott Dixon Interiors

We have successfully used O’Neill & Brennan for the supply of Engineers for Slip forming, steel tube piling operations and the setting out of various underground structures. All temporary staff provided have met our high standards and O'Neill & Brennan were always quick to react to my calls for increased numbers of staff, albeit sometimes at short notice.

Kevan Baker - Divisional Works Manager

Kevan Baker - Divisional Works Manager

I've been with quite a few agencies and O'Neill & Brennan has been the best one and Jackie has been one of the best agents I've worked for. Any problems I've had they've been sorted out straight away. I worked with them for a year, longest contract I've had through an agency. I would definitely recommend them to friends.

Natasha Sekhon

I would like to comment on how well O'Neill & Brennan are run. As a freelance Site Manager I have been in continuous work for nearly 3 years. During that time, I have been extremely impressed with all the staff at O'Neill & Brennan. I have never needed to chase money, my invoices have been paid every Friday, without fail. All in all, I would highly recommend O'Neill & Brennan to anybody looking to work freelance in construction

Tom Joblin

Since I started doing freelance work for O'Neill & Brennan I have found them to be brilliant. I have never once had an issue they couldn't sort. I would be happy to recommend O'Neill & Brennan to anyone

Eoin O’Neill

I have been working though O’Neill & Brennan for a while now and I can say that the service I have received has been very good. Jackie Murray has helped and advised me with any queries I have had along the way and I have always found her to be very approachable and helpful.Overall, O’Neill & Brennan have provided an excellent service and I look forward to continuing to work with them in the future.

Aaron Japaul

O’Neill & Brennan are my favourite agency for the following reasons: 1) Their site rep visited me on site to help me complete all the necessary documentation to register my company with them; 2) Many of their agents are degree qualified articulate and professional; 3) They are not pushy and not always striving for short-term profit; 4) They have provided me with 2 long-term contracts since I started with them 5) They matched the project requirements with my qualifications and experience; 6) The rates I get with O&B are better than with other agencies

Joe Kelly

It’s coming up to my 1st year working with O’Neill & Brennan and I would like to say what a pleasure it’s been, you have been very helpful and supportive and responsive with any issues that arise. If asked by anyone in the trade if I would recommend you I say with all honesty totally, 100% there is not one area of service which you guys supply that I have had any problems with, I hope that our working relationship continues long into the future.

John Scullion

Just to let know that I’m happy with service I’ve received over the last five years. Thanks again to all the staff in the office.

Rodger Williams

I found O’Neill & Brennan online while looking for work. I would highly recommend the agency. The staff are polite and very helpful. They always make sure you are getting on well with your employer and are happy where you are working. I have had a continuous flow of work with O’Neill & Brennan and never had any complaints.

Sean Drennan

I am writing to you to express my gratitude for all the support I have been receiving from Karina and O'Neill & Brennan in the past two years. I have been always treated with respect and offered support and understanding. I was given a great opportunity to work for a respectful company and paid in accordance to my work. Karina made herself available at all times no matter what enquiries or requests I had. O'Neill and Brennan has the best client services.


I just wanted to say thank you very much for all of your assistance whilst I have worked for O’Neill & Brennan. You work very well with me, always helping me when I need assistance. You always plan your own work very efficiently and help others with their work when needed. Your experience and practical attitude have been essential to me on day to day basis.

William Kaminski - Site Manager

This letter is to say thank you to you and all of your team for your involvement with the developments at CALA Thames. This is a magnificent effort all round and once again, thank you to you and your teams involved with us. I look forward to working with you in the future

Stephen Bennett - Construction Director

Stephen Bennett - Construction Director



Building Careers in Construction


We work with some of the top UK contractors to identify and recruit the right people for their management, technical and trades vacancies.  


Sourcing the Talent to Build the Future


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