Dormer windows in Ireland
Clear supply-and-fit prices for replacing draughty dormer windows, insulating freezing dormer cheeks, full dormer bungalow packages and 2026 SEAI grants.
Free, no obligation. One vetted window company covering your county replies.
- €450 to €950to replace an existing dormer window in A-rated uPVC
- €5,200 to €10,500for a full dormer bungalow (8–12 windows fitted)
- €650 to €1,450per dormer to insulate & re-clad cold dormer cheeks
- €4,0002026 SEAI Windows Grant for detached dormer bungalows
Real dormer windows and attic rooms in Ireland
Rear box dormers, pitched gabled dormers, bespoke attic joinery and bright en-suite loft rooms across Ireland.
Three steps to warmer upstairs dormer rooms
- Tell us about your dormersPick window replacement only, a full dormer bungalow upgrade, cheek insulation or a new attic dormer, plus your county.
- One vetted specialist contacts youWe pass your enquiry to one vetted window company covering your county. One company rings you to arrange a roof-level and indoor inspection, not five firms.
- On-site survey & itemised quoteThey check the dormer openings, lead apron flashing, cheek insulation and Part B fire-escape clearances, and quote in writing.
What dormer windows cost in Ireland
Our supply-and-fit price guide for single dormer windows, full dormer bungalows, cheek insulation and new attic dormers.
| Job | Typical cost | What moves the price |
|---|---|---|
| Replace single dormer window (existing dormer, white uPVC) | €450 to €950 per window | Includes roof access, lead apron check & Part B egress stays |
| Replace dormer window in coloured triple uPVC or flush sash | €650 to €1,250 per window | 0.8 W/m²K triple glazing · stops upstairs cold draughts |
| Replace dormer window in aluminium or alu-clad | €850 to €1,750 per window | Ideal for high-wind coastal and upland dormer roofs |
| Full dormer bungalow replacement (8–12 windows), uPVC | €5,200 to €10,500 | After €4,000 SEAI detached grant: €1,200 to €6,500 |
| Full dormer bungalow replacement (8–12 windows), aluminium / alu-clad | €9,500 to €17,500 | After €4,000 SEAI detached grant: €5,500 to €13,500 |
| Insulate & re-clad dormer cheeks & reveals (while window is out) | €650 to €1,450 per dormer | PIR insulation board, breathable membrane, uPVC/zinc cladding & lead check |
| Build new structural attic dormer (carpentry, roof, lead & window) | €3,500 to €7,500 per dormer | Structural rafters, Code 4/5 lead flashing, slate or GRP roof & window |
What's included
- Full survey of upper dormer and ground-floor openings, checking roof access, lead tray condition, cheek timber soundness and Part B egress height.
- Made-to-measure A-rated dormer frames with 90-degree Easy-Clean fire-escape egress friction stays, warm-edge argon low-E glass and multi-point locking.
- Safe removal of old dormer frames without disturbing roof slates or Code 4 lead apron flashings, airtight foam packing around the timber stud reveal, and internal trim.
- VAT at 13.5% on residential supply-and-fit installations.
What pushes it up or down
- Roof access and scaffolding. Most dormer windows set near the eaves can be fitted from inside the bedroom plus an external mobile tower; steep high-level dormers over a conservatory may need a bridged scaffold tower.
- Dormer cheek and reveal rot or heat loss. Irish 1980s and 1990s dormer bungalows often have uninsulated 100mm timber stud cheeks beside the window. Insulating and cladding the cheeks while the frame is out adds €650 to €1,450 per dormer.
- Triple glazing (0.8 W/m²K). Upper dormer bedrooms sit exposed on all three sides of the roof slope; triple-glazed units keep the glass warm and cut wind noise.
- SEAI grants. Pre-2011 detached dormer bungalows qualify for up to €4,000 on the SEAI Windows Grant (and up to €1,500 for roof/attic insulation).
Calculate your dormer window & insulation cost
Select whether you are replacing existing dormer windows, upgrading a whole dormer bungalow, insulating cold dormer cheeks, or building a new attic dormer.
Estimated supply & fit guide
€1,950 to €5,000
3 to 4 dormer windows at €650 to €1,250 per dormer window (13.5% VAT included)
Guide price to replace 3 to 4 dormer windows within existing dormer openings in colour-foiled triple-glazed uPVC or flush sash. Includes 90-degree Easy-Clean Part B fire-escape egress hinges, dressing existing lead apron flashing and internal reveal trim.
Ask a local specialist for a quotePrices, cold cheeks, flashing and SEAI grants
Everything Irish dormer bungalow owners need to know before replacing upper roof windows.
Dormer window replacement costSingle dormer window €450 to €950 (uPVC) to €850 to €1,750 (aluminium/alu-clad), or full dormer bungalow €5,200 to €10,500.See all dormer prices →
Insulating cold dormer cheeksWhy upstairs dormer bedrooms are freezing and how insulating the timber cheeks while the window is out (€650 to €1,450) fixes it.Dormer cheek insulation →
Pitched vs flat-roof dormersGable/pitched slated dormers vs flat GRP/lead dormers, Code 4 lead aprons, and building new attic dormers (€3,500 to €7,500).Dormer roof types →
Part B fire-escape dormer windowsMandatory 450mm clear opening, 0.33 m² area, 90° Easy-Clean egress stays and 800mm–1,100mm cill heights on attic dormers.Part B egress rules →
Planning permission for dormersWhen replacing dormer frames is exempt, and why new rear vs front attic dormers follow different council planning rules.Planning rules explained →
SEAI grants for dormer bungalowsClaim up to €4,000 on the 2026 SEAI Windows Grant plus up to €1,500 towards roof/attic insulation on pre-2011 dormer homes.2026 SEAI dormer grants →Dormer window fitters across all 26 counties
Each county page has local CSO detached/bungalow housing shares, SEAI BER glazing data, Met Éireann heating degree days and towns.
- Carlow51% detached homes · 55% older BER glazing
- Cavan67% detached homes · 51% older BER glazing
- Clare60% detached homes · 63% older BER glazing
- Cork44% detached homes · 59% older BER glazing
- Donegal70% detached homes · 59% older BER glazing
- Dublin10% detached homes · 55% older BER glazing
- Galway59% detached homes · 64% older BER glazing
- Kerry66% detached homes · 59% older BER glazing
- Kildare38% detached homes · 57% older BER glazing
- Kilkenny59% detached homes · 53% older BER glazing
- Laois55% detached homes · 54% older BER glazing
- Leitrim73% detached homes · 52% older BER glazing
- Limerick45% detached homes · 67% older BER glazing
- Longford63% detached homes · 49% older BER glazing
- Louth39% detached homes · 56% older BER glazing
- Mayo70% detached homes · 61% older BER glazing
- Meath50% detached homes · 56% older BER glazing
- Monaghan65% detached homes · 53% older BER glazing
- Offaly58% detached homes · 58% older BER glazing
- Roscommon74% detached homes · 50% older BER glazing
- Sligo56% detached homes · 56% older BER glazing
- Tipperary59% detached homes · 64% older BER glazing
- Waterford42% detached homes · 59% older BER glazing
- Westmeath53% detached homes · 60% older BER glazing
- Wexford61% detached homes · 57% older BER glazing
- Wicklow44% detached homes · 56% older BER glazing
Get a dormer window price for your home
Tap what you need and your county. Your enquiry goes to one vetted window company covering your county for a site inspection and written price.
Common questions from dormer homeowners
How much does it cost to replace a dormer window in Ireland?
Replacing an existing dormer window in Ireland costs €450 to €950 supplied and fitted in white A-rated uPVC, €650 to €1,250 in colour-foiled triple-glazed (0.8 W/m²K) uPVC or timber-look flush sash, and €850 to €1,750 in thermally broken aluminium or alu-clad. Replacing all 8 to 12 windows on a full dormer bungalow costs €5,200 to €10,500 in uPVC.
Why are upstairs bedrooms in Irish dormer bungalows so cold and draughty?
Unlike a two-storey masonry house where upstairs windows sit inside a 300mm insulated cavity block wall, a dormer window projects out through the roof on a 100mm timber stud frame. In 1980s to 2005 Irish dormer bungalows, the triangular side walls (dormer cheeks) and window reveals often have thin, slumped fibreglass and no wind-tight breather membrane, letting freezing wind blow straight around the window frame.
Can dormer cheeks be insulated at the same time as replacing the dormer windows?
Yes — and that is the smartest time to do it. Once the old dormer window frame is removed, the installer or carpenter has direct access to the timber stud cavity and reveals. Fitting rigid PIR insulation board, a breather membrane and maintenance-free uPVC, composite or zinc cheek cladding typically adds €650 to €1,450 per dormer.
Do you need scaffolding to replace dormer bungalow windows?
For most standard 1.5-storey Irish dormer bungalows where the dormer sits just above the ground-floor eaves, experienced crews replace the window from inside the bedroom combined with a compact mobile access tower outside. Full scaffolding is only needed for high 3-storey dormers or when re-slating and re-leading the entire dormer roof.
Is there an SEAI grant for dormer bungalow windows in 2026?
Yes. Pre-2011 detached dormer bungalows qualify for the maximum €4,000 SEAI Windows Grant (€3,000 for semi-detached dormers) when all windows are upgraded to Uw ≤ 1.4 W/m²K as part of a qualifying BER Heat Loss Indicator upgrade.
What fire-escape hinges are required on upstairs dormer windows?
Under Irish Building Regulations Part B, upper dormer bedroom windows must act as emergency escape openings with at least 0.33 m² clear area, a minimum 450mm clear width and 450mm height, and 90-degree Easy-Clean egress friction hinges.
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Replacing cold, draughty or rotten dormer windows?
One vetted window company covering your county inspects the dormer frames, lead apron and side cheeks, and gives you a written price.