How Much Does House Extension Cost?

House Extension CostA house extension project can be an exciting project to undertake. And, it is also much cheaper to extend a house than to upsize it or move to a different house altogether. So, how much does home extension cost in Ireland exactly? Well, although it is extremely difficult to provide a correct estimation as there are numerous variable factors that need to be considered, we will provide you with a guideline to help make things easier for you.   


Type of extension

Single story extension

A lot of the total cost depends on the type of house extension you want. For instance, if you want to only extend the ground floor of your home, the price per square meter can be anywhere between 1,500 to 3,000 pounds. Now, the cost will also depend on the level of specification you choose. Obviously, you will be able to save more if you opt for low-range products.

Two-story extension

Now, if you intend to perform a two-story extension in your house, the widely accepted rule in the industry indicates that you add 50% to the guideline price of a single story extension

Two-story extension

Basement extension

Owing to the structural and construction complexity and risk, you should pay in mind that basement extensions can be costlier than single and two-story extensions. Basement extensions can cost anywhere between 3,500 to 5,000 pounds per square meter.

Additional rooms

If you want to add a kitchen to your extension plans, you can expect to add around 8,000 pounds to your total extension costs. Kitchen extension costs can increase or decrease according to the cost of the fixtures and appliances. A bathroom extension cost usually starts at around 4,500 pounds. Of course, the total cost can significantly increase or decrease according to the quality of the fittings and fixtures. 

Other fees you need to consider

Of course, there are other fees you need to consider as well. For instance, you will need to pay for various professional services to get your extension project underway and completed. In fact, the cost of all professional services will typically be 15 to 20% on top of the construction cost. You will also need to pay for planning application fee, insurance, VAT etc.

Total budget

10 ways to cut the cost of extensions

Let us provide you with a guideline on the total project budget and how much of your budget you should be spending on each factor. Don`t forget about 30 things you have to know before you start your home extension project.

Total Budget

  • The cost of material, builders, and construction: 65%
  • Planning permission and administration: 1%
  • Vat: 13.5%
  • Architect: 10% (15% on top of the construction cost)
  • Insurance: 1%
  • Party wall agreements: 3%

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