House extensions in Waterford
In Waterford, building a house extension costs €1,500 to €2,100 per m² for one storey and €2,000 to €2,400 per m² for two, VAT included. With fees, a 20 m² ground-floor room comes to €41,000 to €52,000 and a 40 m² two-storey extension with an en-suite upstairs to €103,000 to €124,000. Behind the house, 45 m² can go on without a planning application if the conditions are met.
For homes in Waterford City Centre, Ardkeen, Dunmore Road & Grantstown, Tramore, Dungarvan & Abbeyside, Dunmore East & Passage East and Portlaw: the cost of extending, the county's housing, its council, and the price of moving instead.
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- €1,500–€2,100per m², one storey in Waterford, VAT in
- €2,000–€2,400per m², two storeys
- 64%of Waterford houses have three bedrooms or fewer
- €287,000median paid by movers in Waterford, 2025
Extending a house in Waterford
In Waterford, 64% of houses have three bedrooms or fewer and 36% have four or more, across 43,615 permanent houses in the county (Census 2022). The average detached house has 3.6 bedrooms and the average semi 3.1.
People moving home in Waterford paid a median of €287,000 in 2025, across 559 sales (CSO). Selling at that price and buying another costs €8,500 to €16,500 in stamp duty, the estate agent's fee with VAT and the solicitor before the higher price of a bigger house.
47% of Waterford houses have exactly three bedrooms. Adding a single-storey family room at the back, converting an attached garage, or building a ground-floor or two-storey bedroom extension keeps the house you know without the dead costs of moving.
Waterford is priced in Munster: €1,500 to €2,100 per m² for one storey and €2,000 to €2,400 for two, VAT included. Planning applications and €80 section 5 exemption declarations go to Waterford City and County Council.
- 47%of houses have exactly three bedrooms
- 36%have four or more
- 3.1bedrooms in the average semi
- 43,615houses in Waterford (Census 2022)
What an extension costs in Waterford
| Extension | Per m² in Waterford, VAT in | Example, all in |
|---|---|---|
| One storey behind the house | €1,500–€2,100 | 20 m², mid-range: €41,000 to €52,000 |
| Ground-floor bedroom with an en-suite | €1,500–€2,100 | 16 m², standard finish: €33,000 to €47,000 |
| Two storeys, both floors counted | €2,000–€2,400 | 40 m² with an en-suite upstairs: €103,000 to €124,000 |
| Side extension | €1,800–€2,300 | 15 m², mid-range: €36,000 to €45,000 |
| Wraparound | €2,200–€3,050 | 40 m², mid-range: €111,000 to €132,000 |
| Mostly glass, or high spec | €2,800–€3,350 | 20 m² with a wall of glass: €61,000 to €77,000 |
| Garage conversion | One price for the job | €15,000–€45,000 |
Every example includes the build, the drawings and engineer's fees, any en-suite and VAT. Set aside 12% to 15% more for surprises.
Plan your house extension
Four quick taps, and your plan fills in as you answer: what it costs, whether it needs planning permission and how long it takes. Contact details come last, and only if you want a builder to price it.
25 m² single-storey rear in Waterford, mid-range finish: €50,000 to €63,000, including VAT and fees.
How the estimate is worked out
Every kind of extension has a build rate per m² for each region of Ireland, VAT at 13.5% included. A standard finish uses the lower half of that range and mid-range the upper half; high spec or a wall of glass moves the build to the glazed rate. Design, engineer and BER fees go on top, with anything you tick (an en-suite, a kitchen, a steel beam into the house) priced at your finish. A garage conversion gets one price for the whole job, since the walls and roof are already standing. Totals are rounded to the nearest €1,000. Use it to plan with. It isn't a quote: a builder prices your house after seeing it.
Extend or move in Waterford
On a €287,000 house, the median people moving home in Waterford paid in 2025, stamp duty on the next house is €2,870, the agent's fee on the sale €3,500 to €8,800 with VAT, and the solicitor €2,000 to €5,000. That is €8,500 to €16,500 spent before the bigger house's higher price, against €41,000 to €52,000 to build a 20 m² room here. Extend or move house has every county side by side.
Planning in Waterford
Planning rules don't change at the county line. Since 27 July 2026, 45 m² behind the house is exempt if it meets the conditions, and converting an attached garage shares that 45 m². Building at the side, and most two-storey extensions, need an application. In Waterford you apply to Waterford City and County Council: €34 for an extension, or €80 for a section 5 declaration on whether your plan is exempt.
Three things can take the exemption away. A condition in the planning permission your house was built under can remove it, and newer estates often have one. On a protected structure, work that would affect its character isn't exempt. And no extension is exempt if it would obstruct a public right of way or create a traffic hazard. Planning permission for a house extension.
Every way to extend a Waterford house
Each has its own page: costs by size, the planning rules that apply and the weeks of building.
Single-storey rearOne new room behind the house at ground level: a family room, a playroom or a bedroom for a parent.
Two-storeyTwo new floors in one build: more living space downstairs and an extra bedroom over it.
Side extensionThe strip beside a semi or detached house, built on at one level or two.
WraparoundAn L round the back corner of the house, for one big room with a utility or toilet off it.
Garage conversionThe garage you already have becomes a bedroom, an office or a playroom.
Bedroom and en-suiteOne more bedroom, downstairs or up, with a shower room of its own.House Extension coverage across every town in Co. Waterford
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Local house extension coverage across Co. Waterford includes Waterford City Centre, Ardkeen, Dunmore Road & Grantstown, Tramore, Dungarvan & Abbeyside, Dunmore East & Passage East, Portlaw, Lismore, Cappoquin, as well as Tallow, Kilmacthomas, Ardmore, Stradbally and surrounding rural townlands.
Waterford questions
What does a house extension cost in Waterford?
In Waterford, building a house extension costs €1,500 to €2,100 per m² for one storey and €2,000 to €2,400 per m² for two, VAT included. With fees, a 20 m² ground-floor room comes to €41,000 to €52,000 and a 40 m² two-storey extension with an en-suite upstairs to €103,000 to €124,000. Behind the house, 45 m² can go on without a planning application if the conditions are met.
Does an extension in Waterford need planning permission?
Since 27 July 2026 you can build up to 45 m² behind the house without applying for planning permission. That 45 m² includes every extension added since 1964 and any attached garage you convert. The extension can't rise above the house, the house has to keep 25 m² of private open space, ground-floor windows need 1 m or more to the boundary they look onto, and no more than 12 m² of it can be upstairs on a semi or terrace (20 m² on a detached house). Before that date the limit was 40 m². Applications go to Waterford City and County Council.
Is it cheaper to extend or move in Waterford?
Moving on the Waterford median of €287,000 costs €8,500 to €16,500 in stamp duty, agent's and legal fees before the bigger house's price. A 20 m² room costs €41,000 to €52,000 to build here.
Which parts of Waterford do you cover?
All of it, including Waterford City Centre, Ardkeen, Dunmore Road & Grantstown, Tramore, Dungarvan & Abbeyside, Dunmore East & Passage East and Portlaw. Your plan goes to a single vetted builder who works in Waterford.
Who will contact me?
One builder who works in Waterford and has been vetted, and only that one. They price the job in writing after seeing the house, and you decide.
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Room to grow, without moving
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