Dormer vs Bungalow vs Two-Storey — The Form Choice That Drives Cost and Layout
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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).
TL;DR
Single-storey bungalow: cheapest per m² of floor area, largest footprint, best accessibility. €2,500–€3,200/m².
Two-storey: most cost-efficient use of the site, smallest footprint. €2,700–€3,500/m².
Dormer bungalow: compromise, more usable upstairs, smaller roof. €2,700–€3,500/m².
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.
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.
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.