Hollybrook is a minimal residence located in Dublin, Ireland, designed by TOB Architect. The project from the outset had a clear intent to make a series of distinct sequential interior spaces from the front door to the rear garden that knitted the old and new parts of the house together. The pantry area drops from the main house in six generous limestone steps. This room containing a hidden WC and utility area beneath the existing return and the new extension are built in reinforced concrete and wrapped in external insulation.

The concrete work forms the basis of the project providing a material that can be rough in places, smooth and more refined in others, and allows a degree of form making / shaping. Casting the extension as a singular form, the down-stand beams that hold the return overhead and the roof of the extension could depart from being mere structure. They are brought back within the main cruciform space of the extension to buffer the threshold between inside and outside. Wrapping the building in external insulation allows the concrete form to be unbroken internally. The making of the interior spaces took precedence over what the building might look like as an object externally.

The extension is pulled back from the neighboring walls on both sides, on the kitchen sides this has the enjoyable effect of setting a window to look at a plastered wall ( the wall of the neighbors extension) as the sunlight moves across its face over the course of the day. The external glazing screens are similarly kept outside the concrete shell and allowed run to the height of the parapet with the excessive concrete beams exposed behind bronze tinted glass. A generous relationship with the sun throughout the days and seasons is intended, manifest in the changing light and shadows cast on the sloping beams, concrete walls and speckled terrazzo floor inside.

The concrete soffit of the ceiling is carefully set out with the joint lines indicating the plans geometry. A cast fireplace forms one corner and is in contrast to the bracketed columns of the other three corners. This also slopes outward and upward and the face of the concrete is treated differently to the other board marked elements below the 2.4m datum. Its chimney overhead disobeys the orthogonal set out to the plan and rotates 45 degrees. It is capped in concrete with a hole punched through, and is intended as a new eccentric figure amongst the tall victorian brick chimneys that surround it.