Site Layout Plan for a Self-Build in Ireland — Siting, Orientation, and the Passive Solar Question
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A site layout plan for a self-build in Ireland sits the house on the site, orients it for solar gain, and positions the driveway, garden, and wastewater system. Orient living spaces south: south-facing glazing maximises winter solar gain and reduces heating demand by 10–20%. North-facing glazing should be minimal. A 5° rotation of the house can change solar gain by 20% — a site that runs east-west at 5° off south is significantly worse than one that runs directly south. The site layout plan also includes: driveway and parking, garden orientation, wastewater treatment system location (with EPA setbacks), well location (if applicable), and bin storage. Get this right before you design the house. A house designed in isolation from the site is a common self-build mistake.
TL;DR
Orient living spaces south. Site the house to maximise garden, shelter, and access. A 5° rotation can change solar gain by 20%.
Passive solar: south-facing glazing, north-facing minimal glazing, thermal mass on the south side, roof overhangs for summer shading.
The site layout plan is the most important drawing your architect produces. Get it right before you design the house.
When this matters most
You're at design stage and need to decide where the house sits on the site.
When this doesn't apply
You've already lodged planning drawings.
Frequently asked questions
How should I orient my house in Ireland?
Living spaces south. Main glazing south-facing. North-facing walls minimally glazed. Roof overhangs for summer shading. East and west glazing for morning and evening light.
What is passive solar design?
Design that uses the sun's energy for heating and lighting without mechanical systems. South-facing glazing, thermal mass, roof overhangs, and minimal north glazing. Reduces heating demand by 10–20% in Ireland.
Can I site a house anywhere on my site?
Within planning constraints. The site must have safe access, a buildable area (avoiding setbacks, watercourses, septic setbacks), and a defensible siting rationale. Most sites have a narrow range of viable siting options.
Sources
Sustainable Energy Authority of Ireland, Passive house design. https://www.seai.ie/
Frequently asked questions
How should I orient my house in Ireland?
Living spaces south. Main glazing south-facing. North-facing walls minimally glazed. Roof overhangs for summer shading. East and west glazing for morning and evening light.
What is passive solar design?
Design that uses the sun's energy for heating and lighting without mechanical systems. South-facing glazing, thermal mass, roof overhangs, and minimal north glazing. Reduces heating demand by 10–20% in Ireland.
Can I site a house anywhere on my site?
Within planning constraints. The site must have safe access, a buildable area (avoiding setbacks, watercourses, septic setbacks), and a defensible siting rationale. Most sites have a narrow range of viable siting options.