Dormer vs Bungalow vs Two-Storey — The Form Choice That Drives Cost and Layout
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Single-storey bungalow: cheapest, largest footprint. Two-storey: most cost-efficient. Dormer bungalow: compromise, more usable upstairs.
Three form choices for a self-build in Ireland. Single-storey bungalow: cheapest per m² of floor area (€2,500–€3,200/m²), largest footprint, best accessibility, slowest to build. Two-storey: most cost-efficient use of the site (€2,700–€3,500/m²), smallest footprint, most common in suburban Ireland. Dormer bungalow: a compromise (€2,700–€3,500/m²), more usable upstairs, smaller roof than a full two-storey. The choice depends on: site (sloped sites favour split-level or dormer; flat sites favour any), accessibility (bungalow is best for ageing in place), and planning (rural one-off houses often face pressure for rural-appropriate design, which can rule out dormers in some counties).
When this matters most
You're at design stage and need to choose the form of the house.
When this doesn't apply
You've already chosen a form and started design.
Sources
SCSI (Society of Chartered Surveyors Ireland), Construction Cost Guide 2026. https://www.scsi.ie/
Frequently asked questions
What is the cheapest form of house to build in Ireland?
Single-storey bungalow is cheapest per m² of floor area (€2,500–€3,200/m²), but the larger footprint means more foundation and roof. Two-storey is most cost-efficient use of the site overall.
Should I build a dormer bungalow or a two-storey?
Depends on the site, your accessibility needs, and the local vernacular. Dormer is a compromise: more usable upstairs than a bungalow, smaller roof than a two-storey. Two-storey is the most cost-efficient.
What is a dormer bungalow?
A bungalow with a dormer roof, creating usable headroom upstairs. Common in rural Ireland. More cost-efficient than a full bungalow, smaller than a two-storey.
When this matters most
You're at design stage and need to choose the form of the house.
When this doesn't apply
You've already chosen a form and started design.
Where to go next
Next decision
The next step in your build sequence.
- Designing for BER A1 in Ireland — Fabric First, Heat Pump, and What the BER Assessor Measures →
- Choosing an Architect in Ireland — The Five Questions That Sort the Field →
- Drawing Stages for a Self-Build in Ireland — From Sketch to As-Built →
- Site Layout Plan for a Self-Build in Ireland — Siting, Orientation, and the Passive Solar Question →
Branch into
Adjacent decisions at the same stage.
Watch out for
Common mistakes, hidden costs, gotchas.
Compare with
Alternative approaches worth knowing.