Short answer
A kitchen extension in Ireland is priced on its size, how the new room joins the house (steel beams and knocked-through walls), glazing, roof type and the kitchen itself. Rear extensions up to 40m² can be exempt from planning permission if conditions are met, which saves time and fees. Phoenix Maco Ltd, a Dublin builder, prices each kitchen extension after a free site visit with a written, itemised quote.
Key points
- Floor area and structure (steel, foundations) are the biggest costs.
- Large glazing, rooflights and sliding doors add a lot to the budget.
- The kitchen units, worktops and appliances are a separate line.
- Rear extensions up to 40m² may be exempt from planning, with conditions.
- Building Regulations still apply, so certification is part of the cost.
What changes the cost of a kitchen extension
- Size in m² and single or two storey.
- Ground conditions and foundations; drains under the extension.
- Opening up the back wall: steel beams designed by an engineer.
- Roof: flat roof with rooflights or pitched roof.
- Glazing: sliding or bi-fold doors, roof lanterns.
- Heating, underfloor heating, electrics and plumbing for the kitchen.
- Kitchen units, worktops, appliances and flooring.
Do I need planning permission for a kitchen extension?
Many rear extensions up to 40m² (including earlier extensions) are exempt from planning permission, provided at least 25m² of rear garden stays and height and window rules are met. Side and front extensions, protected structures and some estates need permission.
Check with your local council before design. We can work with your architect or recommend one.
Building Regulations and certification
Every extension must meet the Building Regulations for structure, fire safety, ventilation and energy performance. Ask for an architect, engineer or surveyor to sign off. Your solicitor will need this when you sell.
How long it takes
Most single-storey kitchen extensions in Dublin take about 10–16 weeks on site, depending on size and finishes. You can often stay in the house with a temporary kitchen.
Get an accurate price
Send photos of the back of the house and your rough idea. We arrange a free site visit in Dublin and a written quote.
Frequently asked questions
- How much does a kitchen extension cost in Ireland?
- It depends on size, structure, glazing, roof and the kitchen fit-out. Get a written, itemised quote after a site visit rather than relying on a per-m² figure alone.
- Is a 40m² kitchen extension exempt from planning?
- Often yes for rear extensions, if at least 25m² of garden remains and height and window rules are met. Check with your council.
- How long does a kitchen extension take?
- Usually about 10–16 weeks on site for a single-storey extension.
- Can I live in the house during the build?
- Usually yes. We seal off the work area and can set up a temporary kitchen.
- Do you build kitchen extensions in Dublin?
- Yes. Phoenix Maco Ltd builds extensions across Dublin and selected Leinster areas. Call or WhatsApp 083 874 5535.
Official Irish sources
- Citizens Information — Planning permission exemptions
- Department of Housing — Building Regulations guidance
Rules, grant values and rates change. This article is general information, not professional advice — confirm the current position with the relevant body or your own architect, engineer or surveyor.