As part of a new build or extension project, a key consideration is the type of construction method that will be used. Early consideration and planning are important to ensure the completed project meets your current and future requirements. There are many factors to consider when deciding on a construction type, such as:
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Budget – How much funding can be assigned to the project? How will construction type affect this?
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Schedule – What is the desired timeline for project completion?
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Quality– the quality of project finishes are primarily dependent on workmanship and detailing but certain construction types are not best suited for certain sites.
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Site constraints – Where the project is located? What type of site? i.e., accessibility, topography.
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Labour and resource availability – What labour and resources are within a practical, cost - effective distance from your project? Are there competent and experienced contractors for your preferred construction type within a reasonable distance from your project?
The above are just some considerations that should influence the chosen construction type and must be reviewed individually and wholly as part of the decision making process.
In this article, we discuss the various construction types for new residential builds and extensions in Ireland today.
1. Traditional Blockwork (Cavity Block Construction)
What is it?
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Inner and outer concrete block leaf.
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Insulated cavity between the leaves.
Still the most familiar system in Ireland.
Cost?
Typically, €2,000–€2,7000/m² (depending on specifications, location etc).
Labour-intensive → labour cost is a big factor.
Energy Performance
- Can meet Part L (NZEB) standards.
Usually needs:
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High-performance cavity insulation.
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Airtightness measures (plaster, membranes, airtight coating).
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Careful detailing necessary to avoid thermal bridging.
Advantages
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Very durable and robust.
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Well understood by Irish builders and engineers.
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Good acoustic and fire performance.
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Easier to get mortgage approval and insurance.
Disadvantages
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Slower build time.
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Airtightness relies heavily on workmanship.
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Thicker walls for high insulation levels.
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Weather delays are common.
Suited to:
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Self-builds where familiarity and longevity matter.
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One-off houses.
2. Timber Frame
What is it?
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Factory-made timber panels.
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Insulation between studs + internal airtight layer.
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Very common in Ireland.
Cost?
Typically €2,000–€2,700/m² (depending on specifications, location etc).
Energy Performance
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Very good when detailed correctly.
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Airtightness depends heavily on membranes and workmanship.
Advantages
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Fast erection.
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Widely accepted by lenders and insurers.
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Good balance of cost and performance.
Disadvantages
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Less thermal mass than block or ICF
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Airtightness failures can be hard to detect later.
3. SIPs (Structural Insulated Panels)
What is it?
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Factory-made panels.
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OSB board on both sides.
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Rigid insulation core (EPS / PUR / PIR).
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Panels form structure + insulation in one system.
Cost
Structure often €2,100–€2,800/m²
Panels themselves can seem expensive, but:
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Faster build.
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Lower labour cost.
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Reduced heating system size.
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Energy Performance.
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Excellent thermal performance.
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Very high airtightness achievable.
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Easily exceeds Part L and suits low-energy homes.
Advantages
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Fast on-site construction (weeks, not months).
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Very good airtightness.
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Predictable quality (factory made).
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Slim wall build-up = more internal floor area.
Disadvantages
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Requires experienced SIP installer.
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Design changes on site are difficult.
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Less forgiving if detailing is poor.
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Still less common than block or timber frame.
Best for:
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Low-energy or near-Passive houses.
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Projects with tight build programmes.
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Self-builders who plan thoroughly upfront.
4. ICF (Insulated Concrete Formwork)
What is it?
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Hollow insulation blocks (EPS or similar).
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Reinforced concrete poured into the cavity.
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Insulation remains in place permanently.
Cost
Typically, €2,200–€3,000/m².
Higher material cost, but:
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Less block-laying labour.
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Lower heating costs long term.
Energy Performance
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Excellent insulation and airtightness.
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High thermal mass → stable indoor temperatures.
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Very strong compliance with Part L / NZEB.
Advantages
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Extremely strong and durable.
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Great airtightness and soundproofing.
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Comfortable internal environment.
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Works very well with heat pumps.
Disadvantages
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Fewer contractors experienced with ICF.
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Changes after concrete pour are difficult.
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Chasing services can be more complex.
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Slightly thicker walls than SIPs.
Best for:
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Long-term family homes.
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Exposed or coastal sites.
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Homeowners prioritising comfort and durability.
Irish Context – Key Considerations:
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Part L (NZEB) compliance is achievable with all systems.
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Airtightness testing is mandatory regardless of system.
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Mortgage providers are comfortable with all systems listed.
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Availability of skilled contractors can be more important than system choice.
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Early design decisions matter far more for SIPs and ICF.
AES are happy to provide more detailed information for your project and assist in recommending a construction type that will meet your needs. Get in contact today and let’s discuss your upcoming project.
Note this article is intended as a high level breakdown of construction types and may or may not apply to your particular project. Costs provided are high level estimates only.
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