ICF vs Timber Frame vs Block in Ireland — Cost, Speed, U-value, BER Side by Side
On this page
Block €110–€160/m² wall, ICF €180–€240, timber frame €200–€280, SIPs €240–€320. Each wins on different criteria.
Five wall systems for Irish self-builds. Blockwork with external insulation: €110–€160/m² of wall, the cheapest, slowest to build (6–9 weeks for a 150 m² house), easiest to find trades. ICF (insulated concrete formwork): €180–€240/m², 3–5 weeks, mid-cost. Timber frame: €200–€280/m², 2–4 weeks, fastest, easiest to hit BER A1. SIPs: €240–€320/m², 2–3 weeks, premium. CLT (cross-laminated timber): €280–€360/m², 3–5 weeks, premium. Choose by: BER target, site access, local trades, and budget. Building Regulations 2023 TGD-L (Conservation of fuel and energy) sets the wall U-value targets. Most Irish self-builders on standard sites choose block with external insulation; on BER A1-targeted builds, timber frame or ICF is more common.
When this matters most
You're at wall-system choice stage.
When this doesn't apply
You've already specified a wall system in your design.
Sources
Building Regulations 2023, TGD-L (Conservation of fuel and energy — Dwellings). https://www.gov.ie/
NSAI, I.S. EN ISO 13790 — Energy performance of buildings. https://www.nsai.ie/
Frequently asked questions
What is the cheapest wall system in Ireland?
Blockwork with external insulation. €110–€160/m² of wall. Trades are everywhere, materials are stocked locally. Slower to build than other systems.
What is the fastest wall system to build?
SIPs and timber frame, both at 2–4 weeks for a 150 m² house. ICF is 3–5 weeks. Block is 6–9 weeks.
What is the warmest wall system?
SIPs. U-value as low as 0.10 W/m²K with a standard 200 mm panel. Timber frame and ICF both reach 0.13–0.18. Blockwork with external insulation reaches 0.15–0.22.
When this matters most
You're at wall-system choice stage.
When this doesn't apply
You've already specified a wall system in your design.
Where to go next
Next decision
The next step in your build sequence.
- Blockwork for a Self-Build in Ireland — The Default Wall, with External Insulation →
- CLT in Ireland — Cross-Laminated Timber, the Premium Mass-Timber Wall →
- Do Mortgage Lenders Care Which Wall System You Use in Ireland? →
- Timber Frame in Ireland — Why It's the BER A1 Default and What to Watch For →
- Wall System and Insurance in Ireland — What Your Insurer Will and Won't Cover →
- Wall System Build Speed in Ireland — Weeks to Weathertight on a 150 m² House →
- Wall U-value Comparison in Ireland — Five Systems, the Numbers →
Branch into
Adjacent decisions at the same stage.
Watch out for
Common mistakes, hidden costs, gotchas.