Cavity block is still the default in rural Ireland and timber frame is the challenger. Both build good houses. They fail differently, cost differently and take different amounts of time, and the right answer depends more on your site and your schedule than on the method.
Head to head
| Factory timber frame | Cavity block | |
|---|---|---|
| Time to weather-tight | Days for the frame, 2–4 weeks to fully closed | 8–14 weeks |
| Weather dependency | Low once erected; erection needs a dry window | High throughout |
| Cost per m² of structure | Slight premium | Baseline |
| Achieving Part L fabric | Straightforward — deep insulation in the stud zone | Achievable, needs careful detailing at every junction |
| Airtightness | Strong, if the vapour layer is detailed and respected on site | Depends entirely on plaster continuity |
| Thermal mass | Low — heats and cools quickly | High — slow to warm, slow to cool |
| Acoustics between rooms | Needs deliberate detailing | Naturally good |
| Cost certainty | Fixed at order | Priced as it proceeds |
| Trades available locally | Fewer specialist erectors | Everywhere |
| Lender and insurer attitude | Normal, with documentation | Normal |
Where timber frame genuinely wins
- A wet site and a schedule you cannot move — getting a roof on in week two changes everything.
- A fabric-first design where you want deep insulation without a 500 mm wall.
- Any project where price certainty for the shell matters more than the last few per cent of cost.
- Self-builders paying rent during construction.
Where block still makes sense
- Very complex or heavily curved geometry that would fight a panelised system.
- Sites with no crane access at all.
- Where the local trade network is entirely blockwork and you are self-managing on price.
- Where you specifically want the thermal mass and the acoustic behaviour of masonry.
The myths worth retiring
- "Timber frame does not last." Scandinavian timber houses stand for a century and more. What does not last is timber that gets wet and stays wet — which is a detailing and site protection question, not a material one.
- "Timber frame is a fire risk." Fire performance comes from the lining and the cavity barriers, both of which are designed and tested. During construction, before linings go on, the risk is real and is managed by site rules.
- "You cannot hang anything on the walls." You hang things on noggings, which are put where the drawings say. Mark your kitchen and your TV before the panels are made.
- "It is much cheaper." It is not. It is faster and more predictable.
Frequently asked questions
Is timber frame warm in an Irish climate?
Yes. The insulation sits in the depth of the wall with no masonry ties bridging it, so a 371 mm wall can carry 290–300 mm of insulation. The Irish climate question is moisture management, and that is answered by detailing and by keeping the panels dry during erection.
Do Irish banks lend on timber frame?
Yes, routinely, provided the structural documentation is in order and the engineer certifies it.
Which is better for resale?
Neither, on the evidence. What affects resale is the BER, the finish quality and the completion certificate being in order.
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