Providing solutions for house extensions in Ireland & house extensions in Cork


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During the past number of years more Irish home owners have added house extensions to their homes rather than buy a larger house. House extensions create more space in the home and are commonly used as an extra living room, dining room or sometimes as an extra bedroom.

The team at KOS Construction are qualified and experienced builders who have constructed house-extensions in many homes for several years. Our professional and courteous attitude is second to none. Our work meets the highest standards expected by out ever increasing client base.

House Extensions

House Extensions Cork

Over the past several years, the team at KOS Construction have built house extensions in almost every part of Cork. We have also travelled to many places in south west Ireland in order to construct extensions for customers.

House Extensions Cork


If you require a house extension then contact us by;

Telephone: 087 907 8075


or by filling in our Contact Form

House Extension Cost

As the construction industry in Ireland has decreased in recent years, the cost of house extensions has dramatically reduced. There has never been a better time for home owners to add an extra room or two to their houses.

With KOS Construction, you will still get the highest quality of workmanship and professionalism when we build house extensions. It makes economical sense to add a house extension to the home as it will greatly increase the value of any home

House Extensions Ireland

KOS Construction are one of Ireland's leading house-extension builders. The quality of our work is well known throughout the country. We employ qualified builders only and all of our team have experience in building house extensions.

House Extension Designs

If you require a house extension, then we can offer you a wide variety of designs that will complement every style of home. From the initial planning to the finished product our team involve our clients in every step of the process.

If you require a house extension then contact us by;

Telephone: 087 907 8075


or by filling in our Contact Form

House Extensions Designs

House Extensions and Planning Permission

If you are going to build an extension or make other changes to your house in Ireland, you may need planning permission. Generally minor changes such as those listed below do not need planning permission but you should always make absolutely certain that you don't need planning permission before you start building. Failure to obtain planning permission where it is required can result in penalties (i.e., significant fines or even imprisonment). Your local authority will be able to advise you about this.

We cannot answer specific questions on whether or not your proposed development will require permission. Only your local authority can do this. The following information is just a general guideline but should prove helpful.


Generally, you will not need planning permission for:

Building an extension to the rear of the house which does not increase the original floor area of the house by more than 40 square metres and is not higher than the house. The extension should not reduce the open space at the back of the house to less than 25 square metres which must be reserved exclusively for the use of the occupants of your house. If your house has been extended before, the floor area of the extension you are now proposing and the floor area of any previous extension (including those for which you previously got planning permission) must not exceed 40 square metres. (There are also other height restrictions.)

Converting a garage attached to the rear or side of the house to domestic use so long as it has a floor area of less than 40 square metres.

Building a garage at the back or side of a house so long as it does not extend out in front of the building line of the house and does not exceed four metres in height (if it has a tiled/slated pitched roof) or three metres (if it has any other roof type). This building will be exempt from planning permission once the floor area is limited to 25 square metres. Garages or sheds to the side of the house must match the finish of the house and may not be lived in, used for commercial purposes or for keeping pigs, poultry, pigeons, ponies or horses.
Building a front porch so long as it does not exceed two square metres in area and is more than two metres from a public road or footpath. If the porch has a tiled or slated pitched roof, it must not exceed four metres in height or three metres for any other type of roof.

Latest Building and Renovation Projects

Projects carried out throughout Cork from before and during 2017

We have added images of the latest construction and building projects carried out in Cork and throughout the south west of Ireland. Click on any image to see the corresponding large image .

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