cost calculator for house extensions

This calculator is to assist you in estimating the approximate cost of building a home extension in Ireland. In order to use this home extension price calculator for your extension project - you have to know the floor area of your planned house extension and also the floor area of associated house renovation works.


Choose measuring units of proposed house extension floor area:

Floor Area

Which of the following is the best describes the type of construction of your new house extension:


Press the “Calculate” button to estimate your house extension cost:

House extension cost calculator only valid for extensions from 12 square metres upwards. Please note that the above extension cost is indicative and your budget should not be relied upon, as price will vary significantly for each individual project.

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