Dormer windows in Offaly
Dormer window replacement and cheek insulation across Co. Offaly, including Tullamore, Edenderry, Birr, Clara. Replacing an existing dormer window costs €450 to €950 in white A-rated uPVC or €650 to €1,250 in coloured triple-glazed uPVC, while a full dormer bungalow (8 to 12 windows) is €5,200 to €10,500 before the €4,000 SEAI detached grant.
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- €450 to €950to replace a single dormer window in A-rated uPVC
- 58%of Co. Offaly homes are detached (14th of 26 counties)
- 58%of pre-2011 Offaly BER homes have older double glazing
- 2,046heating degree days near Tullamore
What dormer windows cost in Co. Offaly
| Dormer window job in Co. Offaly | White A-rated uPVC | Coloured triple uPVC / flush | Aluminium or alu-clad |
|---|---|---|---|
| Single dormer window replacement | €450 to €950 | €650 to €1,250 | €850 to €1,750 |
| 3 to 4 upper dormer windows | €1,350 to €3,800 | €1,950 to €5,000 | €2,550 to €7,000 |
| Full dormer bungalow (8–12 windows) | €5,200 to €10,500 | €6,800 to €12,800 | €9,500 to €17,500 |
| Insulate & re-clad dormer cheeks (per dormer) | €650 to €1,450 | €650 to €1,450 | €650 to €1,450 |
| Build new structural attic dormer (per dormer) | €3,500 to €7,500 | €3,500 to €7,500 | €3,500 to €7,500 |
Our national price guide for Co. Offaly, inclusive of 13.5% VAT. Pre-2011 detached dormer bungalows in Offaly qualify for up to €4,000 off via the 2026 SEAI Windows Grant.
Dormer bungalows, glazing and towns in Co. Offaly
- 58%detached house share in Co. Offaly (14th of 26)
- 24%of Offaly homes built 1981–2000 (peak dormer bungalow era)
- 21.3 m²median detached window area on Offaly BERs (14.46 m² semi)
- 58%older double glazing on pre-2011 Offaly BERs (11th of 26)
In Co. Offaly, 58% of all households live in a detached house (CSO Census 2022) and 24% of the county's housing stock was built between 1981 and 2000 — the two decades when 1.5-storey dormer bungalows became the dominant house type across Irish rural sites and town outskirts. On SEAI's BER register for pre-2011 homes in Offaly, 58% still have first-generation double glazing (U-value 2.5 to 4.0 W/m²K) and a median window U-value of 2.75 W/m²K.
Near Tullamore, a typical year averages 2,046 heating degree days (the 11th coldest of the 26 county towns). Because upper dormer windows project straight out of the pitched roof slope, replacing draughty 1990s dormer frames with 0.8 W/m²K triple-glazed casements and packing the side cheeks with rigid PIR insulation stops upstairs heat escaping into the roof space.
Main towns covered in Co. Offaly (Census 2022 population): Tullamore (15,598), Edenderry (7,888), Birr (4,726), Clara (3,403), Banagher (1,907), Ferbane (1,324).
Dormer Window coverage across every town in Co. Offaly
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Local dormer window coverage across Co. Offaly includes Tullamore, Edenderry, Birr, Portarlington (Offaly side), Clara, Banagher, Ferbane, Daingean, as well as Kilcormac, Shinrone & Moneygall, Rhode and surrounding rural townlands.
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Offaly dormer window questions
How much does it cost to replace dormer windows in Offaly?
In Co. Offaly, replacing an existing dormer window costs €450 to €950 in white A-rated uPVC, €650 to €1,250 in coloured triple-glazed uPVC or flush sash, and €850 to €1,750 in aluminium or alu-clad. Replacing all 8 to 12 windows on a full dormer bungalow costs €5,200 to €10,500 in uPVC.
Can I get the dormer cheeks insulated while replacing dormer windows in Offaly?
Yes. While the old dormer frame is removed, the side cheeks and reveals can be insulated with rigid PIR board, sealed with a breather membrane and re-clad in maintenance-free uPVC, slate or composite cladding for €650 to €1,450 per dormer.
Do I need planning permission for dormer windows in Offaly?
Replacing existing dormer windows in the same openings is exempted development across Co. Offaly. Building a brand-new projecting attic dormer on a roof slope requires planning permission from Offaly County Council.
Which towns in Co. Offaly are covered?
All of Co. Offaly, including Tullamore, Edenderry, Birr, Clara, Banagher and all rural areas. Your enquiry goes to one vetted window company covering your county.
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Replacing cold, draughty or rotten dormer windows?
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