After more than 40 years, Castlecabin is now known as MODULACC. We’ve changed our name to better match our ambitions to deliver the most innovative and sustainable premium modular buildings to the market. Our name may have changed, but our team and our dedication to delivering modular building solutions will continue. We also stock an extensive range of “ ready to go “  Portable (Prefab) Cabin Solutions, Portable Toilets and Secure Anti Vandal Cabins for Hire or Sale.

Modulacc, known for more than 40 years as Castlecabin, has evolved over four decades to become a leading Irish manufacturer and supplier of energy efficient modular buildings.

The company, founded by Tom Chawke with a small hire fleet in 1979, originally operated on his site at Castletroy in Limerick. Castlecabin initially focused on providing temporary buildings for hire to the construction and event management sectors.

Led by principles of innovation and sustainability, the Limerick-based company now designs, manufactures and installs modular buildings for schools, colleges, commercial and health sector clients across Ireland alongside the original hire business.

“We are grateful to our customers for the opportunities to deliver building solutions. Our company’s reputation and track record over 40 years has been built on these solutions.” – Tony Chawke – Managing Director, Modulacc Ltd.

Modulacc operates across two dedicated manufacturing facilities in Limerick, employing over 40 people.

Modulacc’s talented team works with clients to scope their project; design and off-site build to their requirements and prepare sites for effective installation.

Lease or buy options are available as part of Modulacc’s commitment to delivering building solutions. For more, call our experts on 061 330033.

Speak with our experts



Call us on 061-3330033 and speak with our experts who will asses your requirements. We’ll discuss the final use, and help you decide on the best building type for you.

Our projects team will also asses your site and how best to prepare it to install your building solution. At Modulacc, we’re committed to delivering building solutions, and this means we will also scope your site requirements and deliver a quotation and project plan for this this too.


The next step is to hand you over to our design team who will work with you and your architects on a design specific to you. Our design team have worked extensively across a range of industries including education, health, pharmaceutical and construction and will deliver on best practice design principles, nZeb and Part guidance  for commercial buildings and help you advance your net zero goals. We promise to deliver a building solution for you.


You’ve worked through your design and energy requirements and the next step is to move your building into our manufacturing work stream. All of our premium modular buildings are built off-site at our dedicated manufacturing facility in Limerick. Our team of manufacturing professionals work together with our design team and ensure that your building is manufactured to your specifications.


While the manufacturing process is underway, our Projects Team will be working to prepare your site for additional plumbing, electricity and other services.  Our experienced team has worked on delivering solutions for single laboratories to entire school complexes.


Once your site is ready for your new building, our transport team and our site installs team work together to deliver your building to site and connect it to the required services. Our team will prepare the modules to your spec, do a final snag and hand it over to you for use.


As part of our commitment to delivering building solutions, we offer options to either lease or buy your Modulacc building.

Speak with our experts

What Our Clients Have To Say

“The purpose-built modular unit allowed the Microbiology Laboratory at Cork University Hospital to respond quickly and safely to the COVID-19 pandemic and to provide a hospital and community testing service to patients in the Southern Region”

Laboratory Manager, CUH

“Thanks to the phenomenal work of Gary and his team, our classroom was open in incredible time – a very speedy turnaround. The classroom itself is unlike the prefabs of old, it’s a truly modern modular building. Castle cabin streamlined the process as best they could and guided me along the way. In the midst of a global pandemic we managed to open our new class on time. …Would whole heartedly recommend dealing with Castlecabin.” 

Kevin Twoomey, St. John's National School, Shannon

We are absolutely delighted with our new two classsroom prefab which fits seamlessly on our school site. It was a pleasure to work with Castlecabin from  start to finish. Top marks from Killinure NS to a top class company!”

Carmel Power, Principal, Killinure NS

Our Clients Include

Why Choose Modulacc?

Quick Turnaround
Hire or Buy
Quality Assured
Safe Transport
Tailor Made