Design Brief for a Self-Build in Ireland — 10 Pages That Save €50,000 in Rework
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A design brief for an Irish self-build is a 10–20 page document you write over 2–4 weeks before the architect draws anything. It should cover: your wishlist (rooms, sizes, adjacencies, orientation, views, daylight), your budget (total project cost, contingency, monthly cost ceiling), your site (orientation, access, services, neighbours, trees, slopes, ground conditions), your must-haves (BER A1, four-bed, home office, MVHR) and your must-not-haves (no dormers, no uPVC, no oil heating). The brief is the most important document you write on the project. It shapes every drawing the architect produces. Most self-builders skip it. The result: designs you don't want, drawn on the assumptions of an architect who never met you. Re-doing planning over a missed design point is the single most expensive mistake on this site.
TL;DR
2–4 weeks of your time. 10–20 pages. Wishlist, budget, site, must-haves, must-not-haves. Saves €30k–€80k in redesign fees.
The brief is the most important document you write on the project. It shapes every drawing the architect produces.
Most self-builders skip it. The result: designs you don't want, drawn on the assumptions of an architect who never met you.
When this matters most
You're about to brief an architect for planning drawings.
When this doesn't apply
You've already lodged planning drawings.
Frequently asked questions
How long should a design brief be for a self-build?
10–20 pages. Long enough to cover wishlist, budget, site, must-haves, must-not-haves. Short enough to be readable. Most architects will provide a template.
What goes in a self-build design brief?
Wishlist (rooms, sizes, adjacencies), budget (total project cost), site (orientation, access, services, neighbours, trees, slopes), must-haves (BER target, layout, systems), and must-not-haves (styles, materials, systems you don't want).
Can I write my own design brief?
Yes. Most architects will provide a template. The brief is your document, not the architect's. The architect's job is to interpret and design from it.
Sources
Royal Institute of the Architects of Ireland, Brief guidance. https://www.riai.ie/
Frequently asked questions
How long should a design brief be for a self-build?
10–20 pages. Long enough to cover wishlist, budget, site, must-haves, must-not-haves. Short enough to be readable. Most architects will provide a template.
What goes in a self-build design brief?
Wishlist (rooms, sizes, adjacencies), budget (total project cost), site (orientation, access, services, neighbours, trees, slopes), must-haves (BER target, layout, systems), and must-not-haves (styles, materials, systems you don't want).
Can I write my own design brief?
Yes. Most architects will provide a template. The brief is your document, not the architect's. The architect's job is to interpret and design from it.