Timber Casement Windows Ireland
Natural Timber, Side-Hung Design
Why Timber Casement Windows Remain a Popular Choice
Timber casement windows are a natural choice for Irish homeowners who want real wood character with a side-hung opening style that suits traditional homes. The casement format, hinged at the side, opening outward, is the most common window style in Irish housing stock, from 1930s bungalows and rural cottages to 1970s estates and period townhouses. Natural hardwood gives the frame warmth and texture that aluminium and uPVC alternatives do not replicate.
Double-glazed timber casement windows meet the SEAI Windows and Doors Grant U-value requirement of 1.4 W/m²K, making them grant-eligible for homeowners upgrading pre-2011 homes.
At Bright Vista Group, we supply and install timber casement windows across Dublin and Ireland for renovation projects, replacement work, and new homes that want a natural timber finish. Our casement windows are engineered hardwood, kiln-dried joinery-grade timber with a factory-applied primer system, chosen for its stability and resistance to the moisture and humidity swings of the Irish climate.
Timber Casement Window Specification
Thermal performance
Double-glazed timber casement windows achieve U-values from 1.4 W/m²K — meeting the SEAI Windows and Doors Grant threshold. Triple-glazed options available. Timber frames have lower thermal conductivity than aluminium, contributing to warm reveals and reduced cold bridging around the frame.
Weather Performance
Engineered hardwood frames are treated and primed against moisture ingress. Multi-point espagnolette locking seals the full frame height against wind-driven rain. Factory draught seals at head, sill, and jambs reduce air infiltration to Class 3 or better.
Operation
Side-hung casement windows open outward on friction hinges, providing full-width ventilation across the opening. Multi-point espagnolette handles lock simultaneously at top, bottom, and middle — engaging all points with a single handle turn. Available in side-hung, top-hung, and tilt-and-turn timber configurations.
Durability and Lifespan
Kiln-dried engineered hardwood with factory primer and finish systems resists the moisture cycling and UV exposure of Irish conditions. Lifespan of 25 to 40 years with appropriate repainting maintenance, typically a full external repaint every 5 to 8 years.
SEAI Grant Eligible
Double-glazed timber casement windows meeting the U-value threshold (1.4 W/m²K or better) are eligible for the 2026 SEAI Windows and Doors Grant. Bright Vista Group is an SEAI-registered contractor (No. 19930) and supplies grant documentation with every qualifying order.
Security
Multi-point espagnolette locking as standard — engaging simultaneously at top, bottom, and frame centre. Hardware available in chrome, satin nickel, and black finishes. Compatible with window restrictors for rooms with children.
Comfort, Security, and Daily Performance
In Irish conditions, the casement format works with the climate rather than against it. Side-hung casements provide full-width opening for ventilation in summer, with multi-point espagnolette locking along the full frame height for a draught-proof seal in winter. Modern draught-seal gaskets and double-glazed units significantly improve on the performance of older single-glazed timber casements, which are still common in 1960s to 1990s Irish housing. Timber casement windows with double glazing are SEAI grant-eligible, meeting the 1.4 W/m²K U-value requirement. Bright Vista Group is an SEAI-registered contractor (No. 19930).
For homeowners replacing older timber or uPVC casements, a new engineered hardwood casement with double glazing can achieve U-values meeting the SEAI grant requirement (1.4 W/m²K or better) — qualifying for up to 4,000 euros toward replacement costs.
At Bright Vista Group, we supply and install timber casement windows across Dublin and Ireland — for homeowners, self-builders, and renovation projects. Free site survey included. SEAI grant documentation provided for eligible replacements. Showroom at JFK Enterprise Centre, Bluebell, Dublin 12, by appointment.
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Timber Casement Window Configurations: Side-Hung, Top-Hung, and Tilt-and-Turn
Timber casement windows are available in three main configurations for Irish homes:
- Side-hung casement: the most common format in Ireland. Hinged at the side, opening outward like a door. Full-width ventilation. Suits most domestic window openings from 600mm to 1,200mm wide.
- Top-hung casement: hinged at the top, opening outward at the bottom. Used for high-level or narrow openings where side clearance is limited, above kitchen sinks, in bathrooms, or in rooms where furniture is close to the wall.
- Tilt-and-turn (timber): tilts inward from the top for secure ventilation, or opens fully inward like a door for cleaning or full ventilation. Common in continental European markets, increasingly popular in Ireland for upper-floor rooms.
Most homes use a combination, side-hung on primary rooms, top-hung in bathrooms, tilt-and-turn on upper floors. We advise on the best configuration during the free site survey.
Timber Casement vs Aluminium and uPVC: Which is Right for Your Home?
| Timber casement | Aluminium casement | uPVC casement | |
|---|---|---|---|
| Natural timber feel | Full internal timber | No | No (foil effect only) |
| Frame width | 68–80 mm | 45–65 mm | 70–80 mm |
| U-value (double glazed) | From 1.4 W/m²K | From 1.0 W/m²K | From 0.9 W/m²K |
| Maintenance | Repaint every 5–8 yrs | None | None (fades over time) |
| Lifespan | 25–40 years (maintained) | 40–60 years | 20–30 years |
| Conservation areas | Suitable | Rarely accepted | Rarely accepted |
| SEAI grant eligible | Yes (double glazed) | Yes | Yes |
| Best for | Traditional homes, natural finish | Contemporary homes, low maintenance | Budget upgrades |
U-values are indicative. Conservation area suitability depends on local planning authority requirements — confirm with your planning office before specifying.
Where Timber Casement Windows Are Used in Ireland
Timber casement windows suit a wide range of Irish property types:
- Rural cottages and farmhouses: traditional casement proportions complement single-storey and dormer rural homes. Paintable in any colour to match the render or stonework.
- 1930s to 1970s Irish housing: the dominant window type in Irish semi-detached and terraced estates. Replacement timber casements restore the original material and proportion of these homes.
- Period townhouses: where planning does not require a vertical sliding sash, timber casements provide an authentic period-compatible alternative.
- New builds and extensions: for clients who want a warmer, more characterful feel than aluminium provides, particularly in rural and coastal settings.
- SEAI grant replacements: for homeowners in pre-2011 homes replacing older timber or uPVC casements with energy-efficient double-glazed systems.
Maintaining Timber Casement Windows
Engineered hardwood timber casement windows are significantly lower-maintenance than older-style softwood frames, but they do need periodic attention:
- Annually: inspect the paint film and touch up any chips or bare patches with compatible primer and topcoat. Check draught seals and hardware operation.
- Every 5 to 8 years: full external repaint. Internal faces in normal conditions rarely need attention beyond Year 1.
- As needed: apply a light coat of sash wax or non-silicone lubricant to friction hinges if operation becomes stiff. Replace worn draught seals.
Compared to uPVC (no maintenance but fades and becomes brittle over 20 to 30 years) and aluminium (no maintenance, 40 to 60 year lifespan), timber sits in the middle: longer-lived than uPVC with more maintenance, shorter-lived than aluminium but with a natural feel that neither alternative can match.
Timber Casement Windows and the 2026 SEAI Grant
Timber casement windows with double-glazed units meeting the U-value threshold of 1.4 W/m²K are eligible for the 2026 SEAI Windows and Doors Grant. For eligible homeowners, the grant provides up to 4,000 euros toward window replacement costs depending on dwelling type.
Bright Vista Group is an SEAI-registered contractor (No. 19930). We supply grant-eligible timber casement windows and provide the Declarations of Performance and contractor documentation your SEAI application requires.
Frequently asked questions
Timber Casement Windows Ireland
A timber casement window is a side-hung window hinged at the frame edge, opening outward on friction hinges. The frame and sash are made from natural hardwood, typically engineered kiln-dried timber for stability and moisture resistance. The casement format is the most common window type in Irish domestic housing and suits a wide range of property styles from rural cottages to suburban homes.
Casement windows are hinged at the side and open outward. Sash windows have two panels (sashes) that slide vertically within the frame. Sash windows are the traditional style for Georgian and Victorian period properties and conservation areas. Casement windows are more common in 20th-century Irish housing: bungalows, cottages, and suburban estates. Both are available in natural timber and both are SEAI grant-eligible when double-glazed.
The main options are: side-hung (hinged at the side, opens outward, the most common format), top-hung (hinged at the top, opens at the bottom, used in bathrooms and high-level openings), and tilt-and-turn (tilts inward for ventilation or opens fully inward like a door). Most homes use a combination of configurations across different rooms.
Yes. Double-glazed timber casement windows achieve U-values of 1.4 W/m²K or better, meeting the SEAI Windows and Doors Grant threshold. Timber frames also have lower thermal conductivity than aluminium — meaning less heat loss through the frame itself compared to a standard non-broken aluminium window. Triple-glazed timber casements are available for higher performance targets including near-passive house standards.
Yes. Timber casement windows with double-glazed units meeting the SEAI U-value threshold of 1.4 W/m²K are eligible for the 2026 SEAI Windows and Doors Grant. Grants range from 1,500 euros (apartment) to 4,000 euros (detached home) toward window replacement costs. Bright Vista Group is an SEAI-registered contractor (No. 19930).
Engineered hardwood timber casement windows need an external repaint every 5 to 8 years. Annually, inspect the paint film and touch up any bare patches. Check and lubricate friction hinges once a year if needed. Internal faces rarely require attention in normal conditions. With this maintenance, a quality engineered hardwood casement window lasts 25 to 40 years in Irish conditions.