O'Carroll Engineering Modular Balconies - Carrigmore Woods, Citywest.

𝗣𝗿𝗲𝗰𝗶𝘀𝗶𝗼𝗻 𝗕𝗲𝗵𝗶𝗻𝗱 𝘁𝗵𝗲 𝗕𝗿𝗶𝗰𝗸𝘄𝗼𝗿𝗸

Carrigmore Woods is a 290-apartment social and cost-rental scheme in Citywest, Dublin, developed by Ardstone and built by Monami Construction across six residential blocks ranging from four to six storeys. The facades — alternating red and sandstone brick — carry a clean, consistent balcony line across all six blocks. The balconies appear to float effortlessly from the brickwork. None of that tells you what was required to make it so.

O'Carroll Engineering was appointed as a specialist balcony contractor with full scope responsibility: design, engineering, off-site manufacture, and installation of 252 modular cantilevered OCE Modular Balconies™, along with associated terrace guarding. What that scope involved in practice was considerably more demanding than the unit count suggests.

𝗧𝗵𝗲 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝗕𝗲𝗵𝗶𝗻𝗱 𝘁𝗵𝗲 𝗙𝗶𝗻𝗶𝘀𝗵𝗲𝗱 𝗣𝗿𝗼𝗱𝘂𝗰𝘁

Those 252 balconies were not a repeat exercise. The architectural vision for the scheme — designed deliberately to break up the visual mass of six large blocks — featured convex and concave elevations, acute-angled corners, and staggered block layouts. Behind the curved façade lines, the concrete slab edges were faceted — straight segments approximating the curve, which created varying gaps between the structural anchor point and the finished façade line. Each block had its own structural profile; each introduced its own variables.

The brief, distilled to its essentials: design and fabricate over 30 distinct balcony iterations, maintain lean manufacturing and efficient installation across all of them, and deliver 100% fit-first-time across every unit — with no trial fit on site and consistent structural performance throughout.

𝗘𝗮𝗿𝗹𝘆 𝗖𝗼𝗼𝗿𝗱𝗶𝗻𝗮𝘁𝗶𝗼𝗻 — 𝗧𝗵𝗲 𝗗𝗲𝘀𝗶𝗴𝗻 𝗪𝗼𝗿𝗸𝘀𝗵𝗼𝗽𝘀

O'Carroll Engineering engaged in multiple design workshops with Monami Construction and the wider project design team before fabrication began. What emerged from that process was the technical foundation on which the rest of the project was built.

The primary challenge at the interface level was the disconnect between the curved visual façade and the faceted concrete slab edge behind it. The gap between the structural anchor point and the finished façade line varied across elevations and across different blocks. O'Carroll Engineering engineered a custom stub system that bridged this variable gap consistently, without any visible compromise to the architectural line or structural performance.

At acute-angled corner locations, the available concrete grounds were insufficient to carry the moment forces of a standard cantilevered design. Working through the structural options with the design team, O'Carroll Engineering developed tailored, minimalist prop solutions — engineered to meet the deflection requirements at those locations while remaining architecturally unobtrusive. Where the geometry ruled out the standard solution, a new one was designed and certified.

Design Manager at Monami Construction described the challenge directly: “the combination of complex geometry and limited slab thickness made anchoring solutions far from straightforward, with tight coordination required between ventilation outlets, masonry support, balcony stubs, and the balcony soffit zone”. The collaborative approach, he noted, “delivered a coordinated, buildable solution across multiple balcony types that supported both programme and design intent”.

𝗠𝗮𝗸𝗶𝗻𝗴 𝟯𝟬-𝗣𝗹𝘂𝘀, 𝗩𝗮𝗿𝗶𝗮𝘁𝗶𝗼𝗻𝘀 𝗠𝗮𝗻𝘂𝗳𝗮𝗰𝘁𝘂𝗿𝗮𝗯𝗹𝗲

Thirty-plus balcony iterations across a single programme presented a real manufacturing challenge. The solution was to design a standardised structural base frame that could be deployed across multiple configurations in the range. Variation was then achieved through the cladding layer — not the structure. The base frame remained consistent and efficient to manufacture at volume; the cladding was tailored to each specific location on the building. Manufacturing efficiency was preserved without sacrificing the flexibility the scheme required.

The same thinking shaped the glass railing system. O'Carroll Engineering developed a custom aluminium extrusion specifically for this project — lighter than a steel-and-glass alternative, more efficient to assemble in the factory, and designed to meet the client's precise aesthetic requirements for that element of the scheme.

𝗧𝗵𝗲 𝗗𝗶𝗴𝗶𝘁𝗮𝗹 𝗧𝗵𝗿𝗲𝗮𝗱 — 𝗙𝗿𝗼𝗺 𝗦𝘂𝗿𝘃𝗲𝘆 𝘁𝗼 𝗜𝗻𝘀𝘁𝗮𝗹𝗹𝗮𝘁𝗶𝗼𝗻

Each of the six blocks was 3D laser-scanned to produce accurate as-built digital models before balcony fabrication began. On a project with 30-plus geometric variations and no tolerance for on-site remediation, this was the mechanism by which fit-first-time was achievable. Survey data fed directly into design models; design models fed directly into the fabrication process. 3D laser cutting machines and CNC flatbed cutting equipment processed parts to ±0.2mm accuracy. Demmeler fabrication tables maintained that accuracy through the assembly sequence. Every fitter and welder on the factory floor had live 3D drawing access at their workstation — the right dimension, at the right stage, every time.

𝗪𝗮𝘁𝗲𝗿 𝗠𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁

The staggered balcony layouts across the scheme disrupted the standard vertical drain-stack geometry that conventional drainage relies on. A custom external rainwater gutter system was developed and integrated into each balcony chassis during factory assembly, routing water effectively across the staggered elevations without affecting the visual façade.

𝗢𝗻 𝗦𝗶𝘁𝗲

Deliveries were sequenced to arrive in exact installation order. Where possible, units were transferred directly from the trailer to the crane hook — eliminating double-handling, reducing crane time, and making the most efficient use of limited set-down areas on an extremely busy multi-block site. Balconies arrived fully decked and balustraded. Installation required only final bolt connections, and each unit was fitted with a speed and repeatability that reflected the quality of the off-site preparation.

Zero defects. 100% fit-first-time across all 252 units, on programme, with no delay to the main contractor.

𝗧𝗵𝗲 𝗠𝗲𝗮𝘀𝘂𝗿𝗲 𝗼𝗳 𝗦𝘂𝗰𝗰𝗲𝘀𝘀

The balconies look like they were always there. The 3D scanning, the custom stubs, the tailored props, the engineering workshops, the standardised frames, the custom extrusions, the sequenced logistics — none of it is visible once installed. That invisibility is the measure of success.