About Us

JJ Duffy Construction is a family owned company based in Navan, Co. Meath. We have been established for over 40 years, operating across the country. We provide a comprehensive range of services such as complete demolition and site clearance, partial demolition and alterations, crushing, asbestos removal, strip outs, temporary works and plant hire.

The company has a proven track record across a range of construction and property sectors including the commercial, industrial, and residential fields and in industries ranging from retail, hospitality, leisure and healthcare.

We offer a plant hire service on our range of machinery to suit all requirements.

We carry out demolition works from small buildings/ one off houses and partial demolition, to major industrial buildings and apartment blocks. We have worked on many listed building where we have carried out selective demolition, façade retention, internal demolition and complete gut outs.

Any queries regarding demolition or civil works, please call John Duffy on 087 682 13 54 or James O’Brien on 087 466 72 08.

What We Do

At JJ Duffy we have the capabilities & resources to complete demolition projects from small houses to large complex structural alteration works.

JJ Duffy Demolition approaches each project with precision and a detailed plan. Each project is handled by our team of experts, drawing on backgrounds in environmental remediation, engineering, dismantling, traditional demolition, material handling and the latest technology to guarantee completion safely, on time and on budget.

We can provide a full demolition and clearance service, for any type of site from small residential houses and garages, industrial factories, educational facilities, commercial properties and petrochemical sites both in the public and private sectors. We provide a waste management plan for all jobs and recycle as much material as possible.

JJ Duffy Demolition are fully trained, insured, qualified and experienced asbestos removal experts.

When dealing with asbestos, our team will set up an exclusion zone around the contaminated area so that the public can’t enter the work area. We then get suited and booted, put on our special grade dusk masks and remove all asbestos slates, sheets, cement, floor tiles.

Given the nature of demolition, a detailed risk assessment is required for any works that structural items are to be removed, to avoid unintentional collapse of the building. Where temporary works designs are required, JJ Duffy will engage a specialist design team that will create solutions for what are often complex and challenging situations.

We have experience in providing and installing temporary works for:

  • Adjoining properties
  • Façades
  • Basement walls
  • Remaining structures
  • Shoring systems
  • Site hoarding, perimeter fencing

JJ Duffy Demolition have two crushers for hire nationwide. Our xA400 Terex Pegson is a 45 tonne mobile crusher, capable of crushing over 1000 tonne per day depending on the material.

We also have a 30 tonne Terex Pegson metrotrak, capable of crushing over 750 tonnes a day depending on the material. Both crushers have a magnet which separates any steel that might be through concrete material being crushed. Both are low in vibration and noise and water suppression is used to reduce dust.

JJ Duffy Demolition have a crusher permit which is required to complete any quantity of crushing in the Dublin City council region.

At JJ Duffy, we are aware that bulk excavations require attention to detail. We will always meet tight construction deadlines whilst maintaining top quality work and service.

We have the experience and plant capable of completing bulk excavations of varying sizes. Whether moving rock or rock/clay mixtures, we can excavate, haul and dispose of all materials.

Key Personnell

JOHN DUFFY | Managing Director

John is currently managing director of JJ Duffy Construction Ltd. Degree qualified in Construction Management from WIT, John has over 20 years’ experience in the demolitions and civils industry in Ireland.

Upon completion of he’s degree John worked with Ascon as a graduate engineer. After completion of this role, John worked as a freelance setting out engineer, before joining the family business, with whom he had worked with part time since he was a teenager.

Since joining JJ Duffy’s full time 15 years ago, John has worked on a variety of demolition projects ranging in value from €5k to €1m.

John’s main roles are daily dealings with clients, tendering for new projects, recruitment and implementation of strict health and safety policies to ensure that all projects are managed safely.

John has a hands-on management style whilst overseeing all aspects of the demolition process and is actively involved on all projects as and when required.

Over the past number of years John has invested heavily into the company, to ensure that sufficient plant and an extensive array of demolition attachments are available to ensure that the right tool is always available for the job.


BSc Construction Management & Engineering
Diploma Construction Technology
Manual Handling
Asbestos Awareness & Low-Grade Handling

JAMES O’BRIEN | Contracts Manager

James has over 15 years’ experience in the Construction Industry and is Contracts Manager for JJ Duffy Construction Ltd. Since qualifying from Construction Management & Engineering from WIT, he has gained considerable experience managing building and engineering construction projects in Ireland, Australia and USA. During this time James has been exposed to several facets of construction including sewerage and drainage with the construction of gravity and rising sewer pipelines via conventional excavation methods as well as trenchless techniques, primarily micro tunneling.

James also has extensive experience with constructing deep shaft excavations, constructing in situ, pre-cast and sinking caissons as well as constructing precast and cast in situ pumping stations.

Over the past number of years James has gained valuable experience managing demolition and alteration projects of varying complexity from planning stage to final account.

His main roles include pre-planning consultation, tendering and negotiating new works & managing contract works & final account.

James is well versed with coordinating multiple subcontractors and stakeholders for his projects as well as coordinating and obtaining authority approvals for detailed construction works.

James’s site experience has given him a sound foundation and understanding of what is needed to properly drive his projects to ensure they are run efficiently and to budget.


BSc Construction Management & Engineering
Advanced Diploma Civil Construction
Level 6 Project Supervisor Construction Stage
Manual Handling
Asbestos Awareness & Low-Grade Handling

For any further information regarding any of our works or for pricing, please contact

John on 087 682 1354 or James on 087 466 7208.

We are members of the CIF, CIRI and the Irish Association of Demolition Contractors.
We are also currently in the process of obtaining our Safe T Cert certification.