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A 20 m² kitchen extension in Dublin costs about €54,000 to €69,000 before the kitchen, takes 12 to 16 weeks on site and is usually exempt from planning at the rear.
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Build Me builds kitchen extensions across Dublin, turning a cramped back kitchen into a bright kitchen-diner that opens onto the garden. We handle the steel, the rooflights and sliding doors, the new kitchen itself and the paperwork, so one team takes it from the first drawing to the first dinner.
Build costs per m² in Dublin at standard finish, including VAT, before the kitchen, professional fees and a 15% contingency.
The classic Dublin kitchen extension: the back wall comes out, and the old kitchen and the new room become one long space with the garden at the end. A 20 m² rear extension costs about €54,000 to €69,000 before the kitchen, and it is usually exempt from planning.
€2,700 to €3,400 per m²
On a terrace or a semi with a side passage, filling the gap beside the return turns a narrow galley into a kitchen wide enough for an island. A glazed roof along the boundary wall keeps the middle of the room bright.
€2,800 to €3,500 per m²
Rear and side in one L-shaped build, for a kitchen, dining and living space that takes up most of the ground floor. The side part usually needs planning permission, so allow for that in the timeline.
€3,100 to €4,000 per m²
A glass roof or glazed walls over the dining end, for the feel of eating in the garden. It costs the most per m² and needs solar-control glass so the kitchen doesn't overheat on a sunny afternoon.
€3,400 to €4,500+ per m²
01
Joining the extension to the old kitchen means taking out the rear wall and carrying the house above on steel. A wide opening usually needs a beam on steel posts, and a corner opening may need more. Each beam costs about €800 to €2,500, and our engineer sizes and signs off every one.
02
A deep kitchen-diner goes dark in the middle unless light comes from above. A long rooflight over the worktops or a roof lantern over the island fixes that, and sliding doors give bigger panes and thinner frames than bi-folds. We balance the glazing against the insulation at design stage to meet Part L. For more designs, see our kitchen extension ideas.
03
The sink, dishwasher and washing machine need waste pipes run under the new slab, and the hob needs extraction ducted to the outside. An island hob or sink changes all of that, so we fix the kitchen layout with the drawings, before the floor goes down.
04
The new floor is laid to meet the old one with no step, so the kitchen runs through in one finish. Underfloor heating suits a kitchen-diner with a lot of glass, because it leaves the walls free for units and keeps radiators away from the doors.
05
Supply and fit of a new kitchen typically costs €15,000 to €40,000, with an island adding about €3,000 to €6,000 and a separate utility room €8,000 to €12,000. The units go in over 2 to 4 weeks once they arrive, so we order them early. See our kitchen renovation page for the fit-out.
The island faces the garden or the dining table, so whoever is cooking is part of the room. It needs space: a clear walkway all round, which is why most island kitchens sit in an extension of 20 m² or more. A hob or sink on the island means drains and extraction planned in from the start.
Kitchen along one wall, the table in the middle and a sofa by the doors to the garden. It works best when the old back room joins in too, which can mean a second beam. Zone the lighting so the sofa end can be dim while the worktops stay bright.
Moving the washing machine, coats and muddy boots into a small room off the kitchen keeps the open-plan space calm. It often fits in the old kitchen footprint or a slice of the side passage, with its own door to the garden.
Since 27 July 2026, a rear extension of up to 45 m² is exempted development, up from 40 m², as long as it meets the garden, height and boundary rules. A side or front extension still needs permission.
Usually exemptUp to 45 m² in total, with at least 25 m² of garden left.
Check firstEarlier extensions since 1964 count towards the 45 m².
Needs permissionClass 1 covers the rear only, so a side kitchen needs permission.
Every extension built since 1 October 1964 counts, including an old back kitchen or lean-to.
Example: an 8 m² back kitchen from the 1970s plus a new 28 m² kitchen-diner uses 36 of the 45 m². At least 25 m² of garden must remain.
Rooflights and lanterns sit on the roof, so plan them within the height rule.
Both bring the garden into the kitchen. A solid roof puts light exactly where you want it; a glazed extension gives the most daylight for the highest price.
Cost per m² in Dublin
Build costs at standard finish, including VAT, before the kitchen, fees and contingency. More on glass in our sunroom extension page, and on rooflights and lanterns in our flat roof extension guide. For the full detail, see our house extension cost guide, or our house extensions page for every other way to extend.
About 12 to 16 weeks on site for a single-storey kitchen extension, with the old kitchen in use for most of it.
We look at the house, the garden and the drains, and talk about how you cook, eat and live in the kitchen now.
Drawings, the engineer's steel design and the kitchen layout together, then a written quote. If the plan needs permission, add about 12 to 16 weeks here.
Foundations, drains under the slab, blockwork, the roof and rooflights, then the doors and windows. Your old kitchen keeps working behind the back wall.
The back wall comes out and the steel goes in, then pipes, cables, insulation, screed and plastering.
The units, worktops and appliances go in over 2 to 4 weeks, with flooring, tiling and decorating around them.
Snagging, a deep clean, a walkthrough and the compliance documents for your records.
A kitchen extension is two jobs in one, the building and the kitchen inside it, and we plan them together so the drains, sockets and steel land where the units need them. We're based in Stillorgan, fully insured, and every job carries our 1-year workmanship warranty.
Whatsapp chatSee how we extend Dublin kitchens with rooflights, islands and side returns built to join the house they belong to.
Build Me recently completed a full renovation of our home. The whole process was handled professionally from start to finish. Communication was top-notch, with everything coordinated through a whatsapp group. Really happy with the final result.
Vasilij and team did an outstanding job with our recent house renovations. Their work was exceptional including flooring, tiling, painting plumbing/bathroom installation and other works. The team was always so pleasant, hardworking, diligent and professional.
I couldn't be happier with the fantastic job done by Vasilij, Michael, and Daniel! From start to finish, their professionalism, attention to detail, and craftsmanship were absolutely top-notch.
They expertly plastered and painted the walls with a flawless finish that completely refreshed the space.
Max and VJ did an amazing job in our kitchen. I had a timeline to finish the job within a week and they managed it very well.
Still have questions about your kitchen extension? Call 01 270 9764 and we'll be happy to help.
A single-storey rear kitchen extension in Dublin costs about €2,700 to €3,400 per m² at standard finish, including VAT. A typical 20 m² extension comes to about €54,000 to €69,000, and even a small one starts from about €40,000 because the foundations, steel and roof cost much the same at any size. The kitchen is on top: €15,000 to €40,000 for supply and fit. Add professional fees and a 15% contingency. Our house extension cost guide breaks the figures down, and the extension cost calculator works out your own size.
A little less than in Dublin. Outside Dublin, a single-storey rear extension costs about €2,400 to €3,000 per m² at standard finish, including VAT, and small extensions start from about €35,000. The planning exemption is the same across Ireland. Build Me works in Dublin and north Wicklow, including Bray, Greystones and Enniskerry.
Usually not, if it is at the rear. Since 27 July 2026, a rear extension of up to 45 m² is exempted development under the 2026 exempted development regulations (S.I. 338 to 344 of 2026), up from 40 m². Earlier extensions since 1 October 1964 count towards the total, you must keep at least 25 m² of garden, and a flat roof can be no higher than the eaves or parapet. A side or front kitchen extension needs permission. If you are unsure, a Section 5 declaration from your council costs €80. Read more on planning permission for extensions.
Many Dublin kitchen extensions add 15 to 30 m² across the back of the house. Around 20 m² joined to the old kitchen gives room for a kitchen, a dining table for six and a path to the garden doors. For an island and a sofa as well, plan on 25 to 30 m². Bigger is not always better: it costs more and eats into the garden, and you must keep at least 25 m² of it. Our guide to extension cost by size compares the options.
Yes, and it is one of the most popular layouts. An island costs about €3,000 to €6,000 on top of the kitchen and needs a clear walkway on every side, so it suits extensions of about 20 m² or more. If the island has a hob or a sink, the waste pipe, power and extraction are planned with the drawings and laid before the floor goes down. A roof lantern or a row of pendants over it makes it the centre of the room. For more layouts, see our kitchen extension ideas.
Almost always. Opening the back wall to join the extension to the old kitchen means carrying the walls and floor above on steel. A beam costs about €800 to €2,500 depending on its span, and a wide or corner opening may need posts or more than one beam. Our structural engineer designs each one and signs it off, which you will need when you sell.
About 12 to 16 weeks on site for a single-storey kitchen extension, after a few weeks of design and drawings. Many families stay at home. We build the shell while the back wall is still in place, so the old kitchen keeps working until the extension is weathertight. Expect a few weeks without a full kitchen around the knock-through and the kitchen fit, which takes 2 to 4 weeks once the units arrive.
No. A modular extension is built as a frame or set of panels in a factory and put together on site, which can shorten the time on site. Build Me builds kitchen extensions in traditional block, which suits the foundations, steel and drainage a kitchen needs and matches most Dublin houses. Our guide to modular extensions explains how they work and what to check, and timber frame vs block compares the two methods.
