O'Sullivan Building Materials


Our goal is to provide our extensive experience in the building and refurbishment industry to our clients, insuring their satisfaction. You can be assured of courteous staff, timely project management, and personal attention to bringing your project in on time and on budget. We provide the following services:



O’Sullivan Building Contractors Ltd undertake a full range of construction works including single and double storey extensions, attic conversions, garage conversions and complete new build and renovation projects.

As recommended builders throughout Dublin, we can undertake everything from foundation repair and groundworks, new windows and joinery all the way up to the roof. All of our work comes with both a materials and labour guarantee.

Using trusted suppliers and quality materials with our team of fully qualified tradesmen you can be assured of total build quality whether your project is a renovation, a restoration, a garage or attic conversion or a modern new build.

Getting the shell of your project right is crucial to the quality and integrity of your project. By using the best building materials and insulation methods we will ensure that your building is well ventilated, well insulated and looks great.

Our construction techniques include brick and block, steel frame or timber frame building methods and we can build your extension, attic conversion or new build project to the highest standards.



If you are thinking of converting your attic space we can help. O’Sullivan Building Contractors Ltd have completed numerous attic conversions in and around South Dublin.

No matter how large or small your space can be we’ve got the attic for you. We build Dormer, Mansard and Hip-to-Gable attic conversions and can help with everything from the structural alterations of your property through to the last few roof tiles.

We would be happy to work with you to plan your new attic space no matter how small or large the project - a simple space-adding solution with a loft-ladder or a complete attic renovation with extra bedrooms and a walk-in-shower, we’ve just what your looking for.

Whatever your budget having your attic converted is a great way to improve your home.



O’Sullivan Building Contractor Ltd have a full range of extensions to suit all budgets and home styles. We can help with:

Kitchen Extensions:
We build both single and double storey kitchen extensions in both traditional and modern designs. Having a kitchen extension adds a great room for the family to get together and gives a fluid, open plan feel to your home.

Single-Storey Extensions:
Simple single storey extensions add light and space and can be designed to suit the details of your existing home. We can add skylights, Velux Windows, Bi-fold and sliding door systems and can ‘underlip’ your extension roof-line to increase the height of your extra room and give the feeling of a split level home.

Double Storey Extensions:
We have built numerous double-height extensions with an eye for the character of your home. If your adding an extra bedroom or a walk in bathroom to your home, we can build so that as well as adding a load of extra space your extension looks as though its always been a part of your house.

Garage Conversions:
A garage conversion is a great way to add space to your house without breaking the bank. Given that in the majority of cases most of the foundations have been laid and the brickwork set in place a Garage Conversion can be a simple matter of joining your house and converting the interior.


As well as adding space to your home with an extension or attic conversion, we also offer a full service for house renovations and interior works so that you can get your home just the way you want it. We can help with:

Interior Decorating & Plastering:
We have renovated all types of properties and if your looking to improve your interior scheme we can help with all aspects of decorating in both traditional and modern designs.

Staircases, Doors, Joinery & Carpentry Works:
Good Carpentry and Joinery gives our projects a quality feel. We can help with new staircases, internal doors and shelving or add features such as under-stair storage solutions and walk in wardrobes and fitted bedroom furniture.

Bathroom Refurbishment:
From a simple en-suite to a luxury walk in bathroom we build all types of Bathrooms. With great suppliers, luxury tiling and a range of contemporary fixtures and fittings all our bathrooms achieve a high end finish.

Wooden Flooring & Tiling:
We can help you source and install a full range of tiles and real wooden flooring. We do floors in walnut, Merbau, Beech, Oak or can find the style and grade of wood your looking for.

On the tiling front the choice is unlimited, from clean contemporary granites and limestones all the way through to rustic kitchen tiles for a traditional country kitchen.

Electrical Contracting:
All O’Sullivan Building electrical contracting is RECCI certified for both safety and reliability. We undertake all aspects of electrical renovations and can supply and fit those luxury details including plasma circuits, chrome switches and socket faceplates and great spotlights for both the interior and exterior lighting of your home.

Heating & Plumbing Installation:
All O’Sullivan Building tradesmen are fully qualified and approved contractors and can help with all aspects of heating and plumbing including gas and energy efficiency boilers, high pressure hot water systems and water filtration for hard water areas. All our works are fully guaranteed for both the materials and fixtures and the labour of installation.